Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| vibrio porteresiae sp. nov., a diazotrophic bacterium isolated from a mangrove-associated wild rice (porteresia coarctata tateoka). | two facultatively anaerobic, nitrogen-fixing bacteria (strains mssrf30(t) and mssrf31) were isolated from a mangrove-associated wild rice (porteresia coarctata tateoka). these strains were determined to be nitrogen-fixers using the acetylene reduction assay and by pcr detection of a nifh gene amplicon. phylogenetic analyses based on 16s rrna gene sequences indicated that the novel strains were most closely related to vibrio fluvialis lmg 7894(t) (96.8 % gene sequence similarity), vibrio furnissi ... | 2008 | 18599703 |
| fine mapping of the rice bph1 gene, which confers resistance to the brown planthopper (nilaparvata lugens stal), and development of sts markers for marker-assisted selection. | the brown planthopper (bph) is a major insect pest in rice, and damages these plants by sucking phloem-sap and transmitting viral diseases. many bph resistance genes have been identified in indica varieties and wild rice accessions, but none has yet been cloned. in the present study we report fine mapping of the region containing the bph1 locus, which enabled us to perform marker-aided selection (mas). we used 273 f8 recombinant inbred lines (rils) derived from a cross between cheongcheongbyeo, ... | 2008 | 18612237 |
| molecular evolution of the pi-ta gene resistant to rice blast in wild rice (oryza rufipogon). | rice blast disease resistance to the fungal pathogen magnaporthe grisea is triggered by a physical interaction between the protein products of the host r (resistance) gene, pi-ta, and the pathogen avr (avirulence) gene, avr-pita. the genotype variation and resistant/susceptible phenotype at the pi-ta locus of wild rice (oryza rufipogon), the ancestor of cultivated rice (o. sativa), was surveyed in 36 locations worldwide to study the molecular evolution and functional adaptation of the pi-ta gene ... | 2008 | 18622033 |
| the 172-kb genomic dna region of the o. rufipogon yld1.1 locus: comparative sequence analysis with o. sativa ssp. japonica and o. sativa ssp. indica. | common wild rice (oryza rufipogon) plays an important role by contributing to modern rice breeding. in this paper, we report the sequence and analysis of a 172-kb genomic dna region of wild rice around the rm5 locus, which is associated with the yield qtl yld1.1. comparative sequence analysis between orthologous rm5 regions from oryza sativa ssp. japonica, o. sativa ssp. indica and o. rufipogon revealed a high level of conserved synteny in the content, homology, structure, orientation, and physi ... | 2009 | 18633654 |
| identification of a deletion in tms2 and development of gene-based markers for selection. | rice is one of the most important food crops. the temperature-sensitive genic male sterility (tgms) system provides a great potential for improving food production by hybrids. the use of tgms system is simple, inexpensive, effective, and eliminates the limitations of the conventional three-line system. a rice gene, tms2, generated by irradiation of a japonica variety has been reported to control tgms in several rice lines. previous studies reported genetic markers linked to this gene, and the ge ... | 2008 | 18642025 |
| establishment of a rice transgene flow model for predicting maximum distances of gene flow in southern china. | we aimed to establish a rice gene flow model based on (i) the gaussian plume model, (ii) data from a three-location x 3-yr field experiment on transgene flow to common rice cultivars (oryza sativa), male sterile (ms) lines (o. sativa) and common wild rice (oryza rufipogon), and (iii) 32-yr historical meteorological data collected from 38 meteorological stations in southern china during the rice flowering period. the concept of the gene flow coefficient (gfc) is proposed; that is, the ratio of th ... | 2008 | 18643943 |
| inositol methyl tranferase from a halophytic wild rice, porteresia coarctata roxb. (tateoka): regulation of pinitol synthesis under abiotic stress. | methylated inositol d-pinitol (3-o-methyl-d-chiro-inositol) accumulates in a number of plants naturally or in response to stress. here, we present evidence for accumulation and salt-enhanced synthesis of pinitol in porteresia coarctata, a halophytic wild rice, in contrast to its absence in domesticated rice. a cdna for porteresia coarctata inositol methyl transferase 1 (pcimt1), coding for the inositol methyl transferase implicated in the synthesis of pinitol has been cloned from p. coarctata, b ... | 2008 | 18643954 |
| collection and comparative analysis of 1888 full-length cdnas from wild rice oryza rufipogon griff. w1943. | a huge amount of cdna and est resources have been developed for cultivated rice species oryza sativa; however, only few cdna resources are available for wild rice species. in this study, we isolated and completely sequenced 1888 putative full-length cdna (flcdna) clones from wild rice oryza rufipogon griff. w1943 for comparative analysis between wild and cultivated rice species. two cdna libraries were constructed from 3-week-old leaf samples under either normal or cold-treated conditions. homol ... | 2008 | 18687674 |
| somatic cell cryopreservation and protoplast regeneration of important disease-resistant wild riceoryza meyeriana baill. | oryza meyeriana baill is one of the three wild rice species found in chiia.o. mcyeriana possesses valuable characteristics but is reluctant in cell culturein vitro. in a series of experiments, callus with no regeneration ability was induced from young panicle ofo. meyeriana. the callus was subcultured and propagated. embryogenic cell clones were obtained after cryopreswation. suspension cultures were established and protoplasts were isolated and regenerated into plants. results of artificial ino ... | 1998 | 18726256 |
| gametophytically alloplasmic cms line of rice (oryza sativa l.) with variant orfh79 haplotype corresponds to specific fertility restorer. | for years discovery and identification of the cytoplasmic male sterility (cms) resource in wild rice is the most intriguing events in breeding field. orfh79, a chimeric gene in mitochondria, has been suggested being the determinant for honglian cms in rice. in this report orfh79 gene as molecular marker to screen the wild rice, we found eight accessions with orfh79 gene in the total 42 investigated objects. sequence analysis revealed that there were a total of nine nucleotide substitutions resul ... | 2008 | 18762904 |
| rhizobium oryzae sp. nov., isolated from the wild rice oryza alta. | during a study of endophytic nitrogen-fixing bacteria present in the wild rice species oryza alta, eight novel isolates were obtained from surface-sterilized roots and classified in the genus rhizobium on the basis of almost-complete 16s rrna gene sequence analysis. these strains can nodulate phaseolus vulgaris and glycine max. the highly similar protein patterns, dna fingerprint patterns of insertion sequence-based pcr (is-pcr) and dna-dna hybridizations showed that these novel isolates were me ... | 2008 | 18768622 |
| quantitative trait loci underlying domestication- and yield-related traits in an oryza sativa x oryza rufipogon advanced backcross population. | to understand the genetic characteristics of the traits related to differentiation between cultivated rice and its wild progenitor, genetic factors controlling domestication- and yield-related traits were identified using a bc3f2 population derived from an accession of common wild rice (donor, oryza rufipogon griff.) collected from yuanjiang, yunnan province, china, and an indica cultivar, teqing (recipient, oryza sativa l.). a genetic linkage map consisting of 125 simple sequence repeat (ssr) m ... | 2008 | 18772947 |
| seasonal effect on n2o formation in nitrification in constructed wetlands. | constructed wetlands are considered to be important sources of nitrous oxide (n(2)o). in order to investigate the contribution of nitrification in n(2)o formation, some environmental factors, plant species and ammonia-oxidizing bacteria (aob) in active layers have been compared. vegetation cells indicated remarkable effect of seasons and different plant species on n(2)o emission and aob amount. nitrous oxide data showed large temporal and spatial fluctuations ranging 0-52.8 mg n(2)o m(-2)d(-1). ... | 2008 | 18782640 |
| genetic variation of wild rice populations from thailand and the lao pdr based on molecular markers. | the two wild rice species, oryza rufipogon and o. nivara, which inhabit thailand and the lao pdr, are threatened with the loss of their natural habitats. the losses are primarily attributable to human intervention. before this process advances, it is crucial to obtain basic information on the genetic variations of these species, so important knowledge about the current status of genetic variability. in this study, genetic variation within and between fourteen natural populations of the two popul ... | 2008 | 18819589 |
| genetic control of rice plant architecture under domestication. | the closely related wild rice species oryza rufipogon is considered the progenitor of cultivated rice (oryza sativa). the transition from the characteristic plant architecture of wild rice to that of cultivated rice was one of the most important events in rice domestication; however, the molecular basis of this key domestication transition has not been elucidated. here we show that the prog1 gene controls aspects of wild-rice plant architecture, including tiller angle and number of tillers. the ... | 2008 | 18820696 |
| control of rice grain-filling and yield by a gene with a potential signature of domestication. | grain-filling, an important trait that contributes greatly to grain weight, is regulated by quantitative trait loci and is associated with crop domestication syndrome. however, the genes and underlying molecular mechanisms controlling crop grain-filling remain elusive. here we report the isolation and functional analysis of the rice gif1 (grain incomplete filling 1) gene that encodes a cell-wall invertase required for carbon partitioning during early grain-filling. the cultivated gif1 gene shows ... | 2008 | 18820698 |
| control of a key transition from prostrate to erect growth in rice domestication. | the transition from the prostrate growth of ancestral wild rice (o. rufipogon griff.) to the erect growth of oryza sativa cultivars was one of the most critical events in rice domestication. this evolutionary step importantly improved plant architecture and increased grain yield. here we find that prostrate growth of wild rice from yuanjiang county in china is controlled by a semi-dominant gene, prog1 (prostrate growth 1), on chromosome 7 that encodes a single cys(2)-his(2) zinc-finger protein. ... | 2008 | 18820699 |
| evolutionary analysis of the sub1 gene cluster that confers submergence tolerance to domesticated rice. | tolerance of complete submergence is recognized in a small number of accessions of domesticated asian rice (oryza sativa) and can be conferred by the sub1a-1 gene of the polygenic submergence-1 (sub1) locus. in all o. sativa varieties, the sub1 locus encodes the ethylene-responsive factor (erf) genes sub1b and sub1c. a third paralogous erf gene, sub1a, is limited to a subset of indica accessions. it is thought that o. sativa was domesticated from the gene pools of the wild perennial species o. r ... | 2009 | 18824474 |
| genetic structure of oryza rufipogon griff. in china. | oryza rufipogon griff. (common wild rice; cwr) is the ancestor of asian cultivated rice (oryza sativa l.). investigation of the genetic structure and diversity of cwr in china will provide information about the origin of cultivated rice and the grain quality and yield. in this study, we used 36 simple sequence repeat (ssr) markers to assay 889 accessions, which were highly representative of whole germplasm in china. the analysis revealed a hierarchical genetic structure within cwr. first, cwr ha ... | 2008 | 18827837 |
| characterization of the genome expression trends in the heading-stage panicle of six rice lineages. | to study how changes in gene regulation shape phenotypic variations in rice, we performed a comparative analysis of genome expression in the heading-stage panicle from six lineages of cultivated and wild rice, including oryza sativa subsp. indica, japonica and javanica, o. nivara , o. rufipogon and o. glaberrima. while nearly three-quarters of the genes are expressed at a constant level in all six lineages, a large portion of the genome, ranging from 1767 to 4489 genes, exhibited differential ex ... | 2009 | 18996467 |
| hybrid male sterility in rice controlled by interaction between divergent alleles of two adjacent genes. | sterility is common in hybrids between divergent populations, such as the indica and japonica subspecies of asian cultivated rice (oryza sativa). although multiple loci for plant hybrid sterility have been identified, it remains unknown how alleles of the loci interact at the molecular level. here we show that a locus for indica-japonica hybrid male sterility, sa, comprises two adjacent genes, sam and saf, encoding a small ubiquitin-like modifier e3 ligase-like protein and an f-box protein, resp ... | 2008 | 19033192 |
| independent losses of function in a polyphenol oxidase in rice: differentiation in grain discoloration between subspecies and the role of positive selection under domestication. | asian rice (oryza sativa) cultivars originated from wild rice and can be divided into two subspecies by several criteria, one of which is the phenol reaction (phr) phenotype. grains of indica cultivars turn brown in a phenol solution that accelerates a similar process that occurs during prolonged storage. by contrast, the grains of japonica do not discolor. this distinction may reflect the divergent domestication of these two subspecies. the phr is controlled by a single gene, phr1; here, we rep ... | 2008 | 19033526 |
| [discovery and utilization of favorable genes in wild rice]. | wild rice is the closely related wild relatives of cultivated rice. wild rice provides natural genetic germplasm resources for improving cultivated rice varieties as it possesses many desirable traits and favorable genes, many of which, such as resistance to diseases and insect pests, tolerance to different kinds of stresses and its cytoplasmic male sterility, have been widely used in cultivated rice breeding. in this paper, favorable traits of wild rice germplasm resources and the related genes ... | 2008 | 19073546 |
| genetic identification of quantitative trait loci for contents of mineral nutrients in rice grain. | in present study, fe, zn, mn, cu, ca, mg, p and k contents of 85 introgression lines (ils) derived from a cross between an elite indica cultivar teqing and the wild rice (oryza rufipogon) were measured by inductively coupled argon plasma (icap) spectrometry. substantial variation was observed for all traits and most of the mineral elements were significantly positive correlated or independent except for fe with cu. a total of 31 putative quantitative trait loci (qtls) were detected for these eig ... | 2009 | 19166498 |
| dna polymorphism in the superwoman1 (spw1) locus of the wild rice oryza rufipogon and its related species. | the level and pattern of nucleotide variation in the superwoman1(spw1) locus of the wild rice oriza rufipogon and its related species were analyzed. spw1 is orthologous to apetela3(ap3) in arabidopsis thaliana. the estimated level of nucleotide variation for the entire region (pi = 0.0046) was intermediate among those for other genes of o. rufipogon, although the estimates varied considerably among the spw1 domains. complicated haplotype structure was detected, resulting in a high proportion of ... | 2008 | 19168991 |
| glycaemic index of some commercially available rice and rice products in great britain. | the glycaemic response to nine types of rice (white basmati, brown basmati, white and brown basmati, easy-cook basmati, basmati and wild rice, long-grain rice, easy-cook long-grain rice, thai red rice, thai glutinous rice) and two types of rice vermicelli (guilin rice vermicelli, jiangxi rice vermicelli) commercially available in the united kingdom were compared against a glucose standard in a non-blind, randomized, repeated-measure, crossover design trial. fourteen healthy subjects (six males, ... | 2009 | 19169946 |
| metabolic profiling of transgenic rice with cryiac and sck genes: an evaluation of unintended effects at metabolic level by using gc-fid and gc-ms. | the cryiac and sck genes were introduced to the rice for the purpose of improving the insect resistance. metabolic profiles of wild and transgenic rice were compared to assess the unintended effects related to gene modification. wild samples with different sowing dates or sites were also examined to determine the environmental effects on metabolites. the polar compounds of grains were extracted, trimethylsilylated and analyzed by gas chromatography-flame ionization detection (gc-fid). partial le ... | 2009 | 19233746 |
| genetic architecture for the adaptive origin of annual wild rice, oryza nivara. | the wild progenitors of cultivated rice, oryza nivara and oryza rufipogon, provide an experimental system for characterizing the genetic basis of adaptation. the evolution of annual o. nivara from a perennial ancestor resembling its sister species, o. rufipogon, was associated with an ecological shift from persistently wet to seasonally dry habitats. here we report a quantitative trait locus (qtl) analysis of phenotypic differentiation in life history, mating system, and flowering time between o ... | 2009 | 19236476 |
| snp deserts of asian cultivated rice: genomic regions under domestication. | when performing a genome-wide comparison between indica (93-11) and japonica (nipponbare), we find 8% of the genome, which have an extremely low snp rate (< 1 snp/kb). inside these 'snp deserts', experimentally confirmed genes show increased k(a)/k(s) that indicate adaptive selection. to further elucidate this connection, we survey the level and pattern of genetic variation in both cultivated and wild rice groups, using 155 noncoding regions located within snp deserts. the results suggest that c ... | 2009 | 19243488 |
| evaluation of a multiresidue method for pesticides in cereals using supercritical fluid extraction and gas chromatographic detection. | supercritical fluid extraction (sfe) was evaluated to be applied for residue analysis of 22 gas chromatography/electron capture detector-nitrogen phosphorus detector (gc/ecd-npd) amenable pesticides in rice, wild rice and wheat. samples were extracted with supercritical carbon dioxide at 200 atm pressure and 50 degrees c temperature, using methanol as a static modifier. mean recoveries obtained with the proposed sfe method at two spiking levels with four replicates per level are compared with th ... | 2009 | 19280472 |
| genetic signature of rice domestication shown by a variety of genes. | cultivated rice was domesticated from common wild rice. however, little is known about genetic adaptation under domestication. we investigated the nucleotide variation of both cultivated rice and its wild progenitors at 22 r-gene and 10 non-r-gene loci. a significant regression was observed between wild rice and rice cultivars in their polymorphic levels, particularly in their nonsynonymous substitutions (theta ( a )). our data also showed that a similar proportion (approximately 60%) of nucleot ... | 2009 | 19290563 |
| morphological characteristics of hoplolaimus indicus sher, 1963 in canada, a parasite of wild rice. | hoplolaimus indicus sher, 1963 was found for the first time in north america as a parasite of wild rice. supplemental descriptive data, supported by illustrations, are given which extend the known range of variability in this species. the body, stylet, and tail lengths were often greater than those in published reports from india, the esophageal gland overlap was consistently shorter than body width in most specimens, and the excretory pore and vulva were more posterior. longitudinal striae of t ... | 1983 | 19295820 |
| basic helix-loop-helix transcription factor from wild rice (orbhlh2) improves tolerance to salt- and osmotic stress in arabidopsis. | salt stress adversely affects plant growth and development. some plants reduce the damage of high-salt stress by expressing a series of salt-responsive genes. studies of the molecular mechanism of the salt-stress response have focused on the characterization of components involved in signal perception and transduction. in the present work, we cloned and characterized a basic helix-loop-helix (bhlh) encoding gene, orbhlh2, from wild rice (oryza rufipogon), which encodes a homologue protein of ice ... | 2009 | 19324458 |
| suppressed expression of retrograde-regulated male sterility restores pollen fertility in cytoplasmic male sterile rice plants. | conflict/reconciliation between mitochondria and nuclei in plants is manifested by the fate of pollen (viable or nonviable) in the cytoplasmic male sterility (cms)/fertility restoration (rf) system. through positional cloning, we identified a nuclear candidate gene, retrograde-regulated male sterility (rms) for rf17, a fertility restorer gene for chinese wild rice (cw)-type cms in rice (oryza sativa l.). rna interference-mediated gene silencing of rms restored fertility to a cms plant, whereas i ... | 2009 | 19458265 |
| studies on mineral nutrition and safety of wild rice (oryza l.). | mineral element contents of five wild rice were analyzed, including mineral nutrient elements such as phosphorus (p), potassium (k), calcium (ca), sodium (na), magnesium (mg), iron (fe), zinc (zn), copper (cu), manganese (mn) and selenium (se), and the potential toxic elements arsenic (as), mercury (hg), lead (pb) and cadmium (cd). the results showed that the contents of k, mg, fe, zn, cu, mn and se in five wild rice materials were much higher than the cultivate variety zhou 903 in both brown an ... | 2009 | 19462321 |
| normal expression of insect-resistant transgene in progeny of common wild rice crossed with genetically modified rice: its implication in ecological biosafety assessment. | transgene outflow from genetically modified (gm) rice to its wild relatives may cause undesirable ecological consequences. understanding the level of transgene expression in wild rice following gene flow is important for assessing such consequences, providing that transgene escape from gm rice cannot be prevented. to determine the expression of a transgene in common wild rice (oryza rufipogon), we analyzed the content of cry1ac protein in three gm rice lines containing a bt transgene, their f(1) ... | 2009 | 19504082 |
| identification of a new rice blast resistance gene, pid3, by genomewide comparison of paired nucleotide-binding site--leucine-rich repeat genes and their pseudogene alleles between the two sequenced rice genomes. | rice blast, caused by magnaporthe oryzae, is one of the most devastating diseases. the two major subspecies of asian cultivated rice (oryza sativa l.), indica and japonica, have shown obvious differences in rice blast resistance, but the genomic basis that underlies the difference is not clear. we performed a genomewide comparison of the major class of resistant gene family, the nucleotide-binding site-leucine-rich repeat (nbs-lrr) gene family, between 93-11 (indica) and nipponbare (japonica) wi ... | 2009 | 19506306 |
| dna polymorphism in the blast disease resistance gene pita of the wild rice oryza rufipogon and its related species. | intra-and interspecific dna variations in the blast resistance gene pita in wild rice (oryza rufipogon), cultivated rice (o. sativa), and two other related wild rice species (o. meridionalis and o. officinalis) were analyzed to elucidate the nucleotide polymorphism maintenance mechanisms and evolution of pita in these species. nucleotide diversity at silent sites of o. rufipogon pita was 0.0101, an intermediate value relative to other o. rufipogon nuclear genes. a dimorphic pattern of nucleotide ... | 2009 | 19556706 |
| enterobacter oryzae sp. nov., a nitrogen-fixing bacterium isolated from the wild rice species oryza latifolia. | twelve facultatively anaerobic, endophytic diazotrophs were isolated from surface-sterilized roots of the wild rice species oryza latifolia and characterized by phenotypic and molecular methods. six isolates were grouped together as group a by phenotypic characters, and this grouping was confirmed by sds-page whole-cell protein patterns and insertion sequence-based pcr (is-pcr) methods. phylogenetic analysis of the 16s rrna gene sequence indicated that group a, represented by strain ola 51(t), i ... | 2009 | 19578150 |
| molecular analysis of utility of a retrotransposon, p-sine1-r2 in the asian wild rice and weedy rice populations. | the distribution of a retrotransposon, p-sine1-r2 located at the waxy locus was analyzed by the pcr assay in the perennial wild rice (oryza rufipogon) which inhabited in four isolated and six disturbed populations and in the weedy rice population. the level of clonality of the wild rice species was determined in populations subject to level of water supply and another disturbance. the results showed that all four isolated populations carried the genotype (-/-) and (-/+), while three genotypes (- ... | 2009 | 19579957 |
| fine mapping and candidate gene analysis of spd6, responsible for small panicle and dwarfness in wild rice (oryza rufipogon griff.). | identification of genes in rice that affect production and quality is necessary for improving the critical global food source. cssl58, a chromosome segment substitution line (cssl) containing a chromosome segment of oryza rufipogon in the genetic background of the indica cultivar teqing showed significantly smaller panicles, fewer grains per panicle, smaller grains and dwarfness compared with the recurrent parent teqing. genetic analysis of the bc(4)f(1) and bc(4)f(2) generations, derived from a ... | 2009 | 19588119 |
| over-expression of the rice lrk1 gene improves quantitative yield components. | in rice (oryza sativa l.), the number of panicles, spikelets per panicle and grain weight are important components of grain yield. these characteristics are controlled by quantitative trait loci (qtls) and are derived from variation inherent in crops. as a result of the complex genetic basis of these traits, only a few genes involved in their control have been cloned and characterized. we have previously map-cloned a gene cluster including eight leucine-rich repeat receptor-like kinase (lrk) gen ... | 2009 | 19619185 |
| antioxidant activity of commercial wild rice and identification of flavonoid compounds in active fractions. | the health benefits of whole grain consumption have been attributed to their content of complex carbohydrates, vitamins, minerals, and other phytochemical constituents. wild rice is a whole grain finding applications in gourmet foods due to its nutritional value and unique taste. however, little is known about its antioxidant properties and phytochemical components. the objectives of this study were to evaluate the antioxidant properties of wild rice. eleven commercial wild rice samples (raw, mi ... | 2009 | 19630388 |
| wild rice ( zizania latifolia (griseb) turcz) improves the serum lipid profile and antioxidant status of rats fed with a high fat/cholesterol diet. | the diet consumed by urban residents in modern china has become rich in saturated fats and cholesterol. in addition, the diet is high in carbohydrates from white rice and processed wheat starch. the aim of the present study was to determine the effects of replacing white rice and processed wheat starch with wild rice (wr) as the chief source of dietary carbohydrates. rats fed with the diet patterned after the diet consumed by city residents of modern china showed elevated serum lipid levels comp ... | 2009 | 19631021 |
| subspecies-specific intron length polymorphism markers reveal clear genetic differentiation in common wild rice (oryza rufipogon l.) in relation to the domestication of cultivated rice (o. sativa l.). | it is generally accepted that oryza rufipogon is the progenitor of asian cultivated rice (o. sativa). however, how the two subspecies of o. sativa (indica and japonica) were domesticated has long been debated. to investigate the genetic differentiation in o. rufipogon in relation to the domestication of o. sativa, we developed 57 subspecies-specific intron length polymorphism (ssilp) markers by comparison between 10 indica cultivars and 10 japonica cultivars and defined a standard indica rice an ... | 2009 | 19631918 |
| mangrovibacter plantisponsor gen. nov., sp. nov., a nitrogen-fixing bacterium isolated from a mangrove-associated wild rice (porteresia coarctata tateoka). | a facultatively anaerobic, nitrogen-fixing bacterium, strain mssrf40(t), was isolated from roots of mangrove-associated wild rice (porteresia coarctata tateoka). on the basis of 16s rrna gene sequence similarities, strain mssrf40(t) was shown to belong to the family enterobacteriaceae, most closely related to cronobacter muytjensii e603(t) (97.2 % sequence similarity), enterobacter cloacae subsp. dissolvens lmg 2683(t) (97.1 %), e. radicincitans d5/23(t) (97.1 %) and e. ludwigii en-119(t) (97.0 ... | 2010 | 19648330 |
| seasonal changes in supercooling points and glycerol content in overwintering larvae of the asiatic rice borer from rice and water-oat plants. | the asiatic rice borer chilo suppressalis (walker) occurs mainly on rice oryza sativa l. and water-oat zizania latifolia (turcz). certain ecological and physiological differentiations between rice and water-oat populations have been shown. to determine whether there is host-associated differentiation in supercooling capacity, seasonal changes in supercooling points, glycerol content, and other physiological parameters of naturally occurring c. suppressalis larvae overwintering in rice and water- ... | 2009 | 19689898 |
| transpositional activation of mping in an asymmetric nuclear somatic cell hybrid of rice and zizania latifolia was accompanied by massive element loss. | we have reported previously that the most active miniature inverted terminal repeat transposable element (mite) of rice, mping, was transpositionally mobilized in several rice recombinant inbred lines (rils) derived from an introgressive hybridization between rice and wild rice (zizania latifolia griseb.). to further study the phenomenon of hybridization-induced mping activity, we undertook the present study to investigate the element's behavior in a highly asymmetric somatic nuclear hybrid (sh6 ... | 2009 | 19711051 |
| [study on the growth characteristics and root exudates of three wetlands plants at different culture conditions]. | wetland plants are the important component of constructed wetlands and their root exudates provide the interior hydrocarbon for denitrification. in this study, the growth characteristics and root exudates of canna indica, zizania caduciflora and lythrum salicari in different culture conditions were researched. the results showed that the average biomass initial/biomass in 120 days growth of canna indica, zizania caduciflora and lythrum salicari were 9.1, 3.7, and 4.7, respectively. there was a p ... | 2009 | 19774982 |
| physiological and molecular changes in oryza meridionalis ng., a heat-tolerant species of wild rice. | oryza meridionalis ng. is a wild relative of oryza sativa l. found throughout northern australia where temperatures regularly exceed 35 degrees c in the monsoon growing season. heat tolerance in o. meridionalis was established by comparing leaf elongation and photosynthetic rates at 45 degrees c with plants maintained at 27 degrees c. by comparison with o. sativa ssp. japonica cv. amaroo, o. meridionalis was heat tolerant. elongation rates of the third leaf of o. meridionalis declined by 47% ove ... | 2010 | 19819927 |
| fon2 spare1 redundantly regulates floral meristem maintenance with floral organ number2 in rice. | clavata signaling restricts stem cell identity in the shoot apical meristem (sam) in arabidopsis thaliana. in rice (oryza sativa), floral organ number2 (fon2), closely related to clv3, is involved as a signaling molecule in a similar pathway to negatively regulate stem cell proliferation in the floral meristem (fm). here we show that the fon2 spare1 (fos1) gene encoding a cle protein functions along with fon2 in maintenance of the fm. in addition, fos1 appears to be involved in maintenance of th ... | 2009 | 19834537 |
| porteresia coarctata (roxb.) tateoka, a wild rice: a potential model for studying salt-stress biology in rice. | porteresia coarctata (syn = oryza coarctata) is a tetraploid wild rice growing abundantly in the coastal region of india and some other asian countries. the salt tolerance property of this mangrove associate has been dealt with by a number of workers earlier. the distinct morphology and leaf architecture enabling the plant to exclude salt is a characteristic feature of porteresia in comparison with oryza sp. a number of genes have been isolated and characterized from porteresia that are related ... | 2010 | 19843254 |
| a universal core genetic map for rice. | to facilitate the creation of easily comparable, low-resolution genetic maps with evenly distributed markers in rice (oryza sativa l.), we conceived of and developed a universal core genetic map (ucgm). with this aim, we derived a set of 165 anchors, representing clusters of three microsatellite or simple sequence repeat (ssr) markers arranged into non-recombining groups. each anchor consists of at least three, closely linked ssrs, located within a distance below the genetic resolution provided ... | 2010 | 19847389 |
| invertebrate mercury bioaccumulation in permanent, seasonal, and flooded rice wetlands within california's central valley. | we examined methylmercury (mehg) bioavailability in four of the most predominant wetland habitats in california's central valley agricultural region during the spring and summer: white rice, wild rice, permanent wetlands, and shallowly-flooded fallow fields. we sampled mehg and total mercury (thg) concentrations in two aquatic macroinvertebrate taxa at the inlets, centers, and outlets of four replicated wetland habitats (8 wetlands total) during two time periods bounding the rice growing season ... | 2010 | 19880160 |
| the homeotic gene long sterile lemma (g1) specifies sterile lemma identity in the rice spikelet. | the mechanism of floral organ specification is principally conserved in angiosperms, as demonstrated by the abc model. by contrast, mechanisms that regulate the development of organs or structures specific to a group of species remain unclear. grasses have unique inflorescence units, comprising spikelets and florets. in the genus oryza (rice), the single spikelet consists of a fertile floret subtended by a lemma and a palea, two sterile lemmas, and rudimentary glumes. each sterile lemma is a tin ... | 2009 | 19901325 |
| pericarp color and haplotype diversity in weedy rice (o. sativa f. spontanea) from thailand. | weedy rice (oryza sativa f. spontanea) is an important resource for breeding and evolutionary studies. the present study was carried out to identify the genotype of weedy rice strains responsible for variation of pericarp color by sequencing exon 6 of the rc gene. haplotype analysis revealed that rice strains with light red- and red-pericarp lacked the 14 bp deletion in the rc gene, while rice strains with white-, brown and light green-pericarp contained the 14 bp deletion. a single nucleotide p ... | 2009 | 19943464 |
| phylogeny and biogeography of the eastern asian-north american disjunct wild-rice genus (zizania l., poaceae). | the wild-rice genus zizania includes four species disjunctly distributed in eastern asia and north america, with three species (z. aquatica, z. palustris, and z. texana) in north america and one (z. latifolia) in eastern asia. the phylogeny of zizania was constructed using sequences of seven dna fragments (atpb-rbcl, matk, rps16, trnl-f, trnh-psba, nad1, and adh1a) from chloroplast, mitochondrial, and nuclear genomes. zizania is shown to be monophyletic with the north american species forming a ... | 2010 | 19944174 |
| fine mapping of a gene causing hybrid pollen sterility between yunnan weedy rice and cultivated rice (oryza sativa l.) and phylogenetic analysis of yunnan weedy rice. | weedy rice represents an important resource for rice improvement. the f(1) hybrid between the japonica wide compatibility rice cultivar 02428 and a weedy rice accession from yunnan province (sw china) suffered from pollen sterility. pollen abortion in the hybrid occurred at the early bicellular pollen stage, as a result of mitotic failure in the microspore, although the tapetum developed normally. genetic mapping in a bc(1)f(1) population (02428//yunnan weedy rice (ywr)/02428) showed that a majo ... | 2010 | 19946705 |
| novel bifunctional nucleases, ombbd and atbbd1, are involved in abscisic acid-mediated callose deposition in arabidopsis. | screening of the expressed sequence tag library of the wild rice species oryza minuta revealed an unknown gene that was rapidly and strongly induced in response to attack by a rice fungal pathogen (magnaporthe oryzae) and an insect (nilaparvata lugens) and by wounding, abscisic acid (aba), and methyl jasmonate treatments. its recombinant protein was identified as a bifunctional nuclease with both rnase and dnase activities in vitro. this gene was designated ombbd (for o. minuta bifunctional nucl ... | 2010 | 20018603 |
| identity, diversity, and molecular phylogeny of the endophytic mycobiota in the roots of rare wild rice (oryza granulate) from a nature reserve in yunnan, china. | rice (oryza sativa l.) is, on a global scale, one of the most important food crops. although endophytic fungi and bacteria associated with rice have been investigated, little is known about the endophytic fungi of wild rice (oryza granulate) in china. here we studied the root endophytic mycobiota residing in roots of o. granulate by the use of an integrated approach consisting of microscopy, cultivation, ecological indices, and direct pcr. microscopy confirmed the ubiquitousness of dark septate ... | 2010 | 20038691 |
| agricultural wetlands as potential hotspots for mercury bioaccumulation: experimental evidence using caged fish. | wetlands provide numerous ecosystem services, but also can be sources of methylmercury (mehg) production and export. rice agricultural wetlands in particular may be important sites for mehg bioaccumulation due to their worldwide ubiquity, periodic flooding schedules, and high use by wildlife. we assessed mehg bioaccumulation within agricultural and perennial wetlands common to california's central valley during summer, when the majority of wetland habitats are shallowly flooded rice fields. we i ... | 2010 | 20067279 |
| identification and quantification of anthocyanin pigments in colored rice. | anthocyanin pigments from varieties of black, red and wild rice were identified and quantified to evaluate their potential as nutritional function, natural colorants or functional food ingredients. anthocyanin extraction was conducted with acidified methanol with 0.1m hcl (85:15, v/v) and identification of anthocyanin, aglycone and sugar moieties was conducted by comparison with purified standards by hplc, ultraviolet-visible absorption spectrophotometer and paper chromatography. black and wild ... | 2008 | 20126365 |
| modelling pollen-mediated gene flow in rice: risk assessment and management of transgene escape. | fast development and commercialization of genetically modified plants have aroused concerns of transgene escape and its environmental consequences. a model that can effectively predict pollen-mediated gene flow (pmgf) is essential for assessing and managing risks from transgene escape. a pollen-trap method was used to measure the wind-borne pollen dispersal in cultivated rice and common wild rice, and effects of relative humidity, temperature and wind speed on pollen dispersal were estimated. a ... | 2010 | 20132516 |
| massive gene losses in asian cultivated rice unveiled by comparative genome analysis. | rice is one of the most important food crops in the world. with increasing world demand for food crops, there is an urgent need to develop new cultivars that have enhanced performance with regard to yield, disease resistance, and so on. wild rice is expected to provide useful genetic resources that could improve the present cultivated species. however, the quantity and quality of these unexplored resources remain unclear. recent accumulation of the genomic information of both cultivated and wild ... | 2010 | 20167122 |
| analysis of qtls for yield-related traits in yuanjiang common wild rice (oryza rufipogon griff.). | using an accession of common wild rice (oryza rufipogon griff.) collected from yuanjiang county, yunnan province, china, as the donor and an elite cultivar 93-11, widely used in two-line indica hybrid rice production in china, as the recurrent parent, an advanced backcross populations were developed. through genotyping of 187 ssr markers and investigation of six yield-related traits of two generations (bc(4)f(2) and bc(4)f(4)), a total of 26 qtls were detected by employing single point analysis ... | 2010 | 20227048 |
| genomic structure and evolution of the pi2/9 locus in wild rice species. | rice blast, caused by the fungal pathogen magnaporthe oryzae, is a devastating disease of rice worldwide. among the 85 mapped resistance (r) genes against blast, 13 have been cloned and characterized. however, how these genes originated and how they evolved in the oryza genus remains unclear. we previously cloned the rice blast r-genes pi2, pi9, and piz-t, and analyzed their genomic structure and evolution in cultivated rice. in this study, we determined the genomic sequences of the pi2/9 locus ... | 2010 | 20229250 |
| genetic control of phenotypic plasticity in asian cultivated and wild rice in response to nutrient and density changes. | phenotypic plasticity is an adaptive mechanism adopted by plants in response to environmental heterogeneity. cultivated and wild species adapt in contrasting environments; however, it is not well understood how genetic changes responsible for phenotypic plasticity were involved in crop evolution. we investigated the genetic control of phenotypic plasticity in asian cultivated (oryza sativa) and wild rice (o. rufipogon) under 5 environmental conditions (2 nutrient and 3 density levels). quantitat ... | 2010 | 20237598 |
| african rice (oryza glaberrima steud.): lost crop of the enslaved africans discovered in suriname. | african rice (oryza glaberrimasteud.): lost crop of the enslaved africans discovered in suriname. african rice (oryza glaberrima steud.) was introduced to the americas during the slave trade years and grown by enslaved africans for decades before mechanical milling devices facilitated the shift towards asian rice (o. sativa l.). literature suggests that african rice is still grown in guyana and french guiana, but the most recent herbarium voucher dates from 1938. in this paper, evidence is prese ... | 2010 | 20339580 |
| a new species of harpophora (magnaporthaceae) recovered from healthy wild rice (oryza granulata) roots, representing a novel member of a beneficial dark septate endophyte. | a survey of the endophytic fungal community of wild rice (oryza granulata) in china was conducted. two isolates recovered from healthy roots are assumed to be dark septate endophytes (dses). they are morphologically similar to species from the genus harpophora and are identified as a new species, harpophora oryzae, based on the molecular phylogeny and morphological characteristics. a neighbor-joining tree constructed from its-5.8s rrna gene regions reveals that h. oryzae forms a distinctive subc ... | 2010 | 20402786 |
| vibrio mangrovi sp. nov., a diazotrophic bacterium isolated from mangrove-associated wild rice (poteresia coarctata tateoka). | the taxonomic status of a nitrogen-fixing bacterium, strain mssrf38(t), isolated from the rhizosphere of mangrove-associated wild rice (porteresia coarctata tateoka), in pichavaram, india, was studied using a polyphasic approach. phylogenetic analyses based on 16s rrna gene sequences indicated that the novel strain mssrf38(t) was most closely related to vibrio ruber dsm 16370(t) (98.3% gene sequence similarity), vibrio rhizosphaerae dsm 18581(t) (98.2% sequence similarity) and <96% to the remain ... | 2010 | 20402787 |
| protocol: a simple gel-free method for snp genotyping using allele-specific primers in rice and other plant species. | abstract: | 2010 | 20409329 |
| duplication and independent selection of cell-wall invertase genes gif1 and oscin1 during rice evolution and domestication. | various evolutionary models have been proposed to interpret the fate of paralogous duplicates, which provides substrates on which evolution selection could act. in particular, domestication, as a special selection, has played important role in crop cultivation with divergence of many genes controlling important agronomic traits. recent studies have indicated that a pair of duplicate genes was often sub-functionalized from their ancestral functions held by the parental genes. we previously demons ... | 2010 | 20416079 |
| performance evaluation of laboratory scale up-flow constructed wetlands with different designs and emergent plants. | the objective of present study was to assess the simultaneous removal of organic pollutants and nutrients by five laboratory scale up-flow constructed wetlands (ufcws). aerobic and anaerobic regions were well developed at the upper and lower beds, respectively, in the ufcw reactors with supplementary aeration. the emergent plants employed were phragmites australis and manchurian wild rice. the cod, t-n, t-p, nh(4)-n and no(3)-n removal efficiencies for the ufcw reactors were in the range of 90-9 ... | 2010 | 20451374 |
| morphological and molecular differences in two strains of ustilago esculenta. | ustilago esculenta is a fungal endophyte of zizania latifolia that plays an important agricultural role in this vegetable crop. the purpose of this study was to characterize sporidial (t) and mycelial (m-t) strains of u. esculenta isolated from sporulating and non-sporulating galls on plants growing in zhejiang province, china. morphological comparisons of the t strain and m-t strain were made by optical and scanning electron microscope observation. genetic differences were examined by sequencin ... | 2011 | 20495805 |
| identification and fine mapping of a major quantitative trait locus originating from wild rice, controlling cold tolerance at the seedling stage. | cold tolerance at the seedling stage (ctss) is an important trait affecting stable rice production in temperate climates and areas of high elevation. in this study, 331 single nucleotide polymorphism (snp) markers were developed and used along with phenotypic evaluation to identify quantitative trait loci (qtls) associated with ctss from a mapping population of 184 f(2) plants derived from a cold tolerant wild rice, w1943 (oryza rufipogon), and a sensitive indica cultivar, guang-lu-ai 4 (gla4). ... | 2010 | 20526617 |
| overexpression of a homopeptide repeat-containing bhlh protein gene (orbhlh001) from dongxiang wild rice confers freezing and salt tolerance in transgenic arabidopsis. | dongxiang wild rice (oryza rufipogon) is the northernmost wild rice in the world known to date and has extremely high cold tolerance and many other adversity-resistant properties. to identify the genes responsible for the high stress tolerance, we isolated and characterized a basic helix-loop-helix (bhlh) protein gene orbhlh001 from dongxiang wild rice. the gene encodes an ice1-like protein containing multiple homopeptide repeats. expression of orbhlh001 is induced by salt stress and is predomin ... | 2010 | 20559833 |
| a genetic resource for early-morning flowering trait of wild rice oryza officinalis to mitigate high temperature-induced spikelet sterility at anthesis. | high temperatures over 32-36 degrees c at anthesis induce spikelet sterility in rice. the use of a germplasm with an early-morning flowering (emf) trait has been hypothesized as a way of avoiding this problem. in this study, the effect of the emf trait on avoiding high temperature-induced sterility at anthesis by flowering at a cooler temperature in the early morning was evaluated. | 2010 | 20566680 |
| seeing red: the origin of grain pigmentation in us weedy rice. | weedy forms of crop species infest agricultural fields worldwide and are a leading cause of crop losses, yet little is known about how these weeds evolve. red rice (oryza sativa), a major weed of cultivated rice fields in the us, is recognized by the dark-pigmented grain that gives it its common name. studies using neutral molecular markers have indicated a close relationship between us red rice and domesticated rice, suggesting that the weed may have originated through reversion of domesticated ... | 2010 | 20584133 |
| elucidation of xa21-mediated innate immunity. | in the early 1970s, the xa21 gene from the wild rice species oryza longistaminata drew attention of rice breeders because of its broad-spectrum resistance to diverse strains of a serious bacterial disease of rice in asia and africa, called 'bacterial blight disease', caused by the gram-negative bacterium, xanthomonas oryzae pv. oryzae (xoo). in 1995, we isolated the gene controlling this resistance and in 2009 demonstrated that xa21 recognizes a highly conserved peptide, called 'ax21' (activator ... | 2010 | 20590657 |
| simple and efficient method for isolating cdna fragments of lea3 genes with potential for wide application in the grasses (poaceae). | cdna fragments of lea3 genes with a high gc content (from 68 to 77%) were found in several poaceae, including sorghum vulgare, saccharum officinarum, oryza officinalis, oryza meyeriana, ampelocalamus calcareus, cynodon dactylon, and zizania latifoli. they were successfully isolated by means of optimal experimental parameters, which included dimethyl sulfoxide as additive and degenerate primers "agetkas" and "agkdktg", and their sequences were analyzed. compared to the method of isolating genes b ... | 2010 | 20623457 |
| characterization of seeds of selected wild species of rice (oryza) stored under high temperature and humidity conditions. | wild progenitors of rice (oryza) are an invaluable resource for restoring genetic diversity and incorporating useful traits back into cultivars. studies were conducted to characterize the biochemical changes, including sds-page banding pattern of storage proteins in seeds of six wild species (oryza alta, o. grandiglumis, o. meridionalis, o. nivara, o. officinalis and o. rhizomatis) of rice stored under high temperature (45 degrees c) and humidity (approixmately 100%) for 15 days, which facilitat ... | 2010 | 20653290 |
| transpositional reactivation of the dart transposon family in rice lines derived from introgressive hybridization with zizania latifolia. | it is widely recognized that interspecific hybridization may induce "genome shock", and lead to genetic and epigenetic instabilities in the resultant hybrids and/or backcrossed introgressants. a prominent component involved in the genome shock is reactivation of cryptic transposable elements (tes) in the hybrid genome, which is often associated with alteration in the elements' epigenetic modifications like cytosine dna methylation. we have previously reported that introgressants derived from hyb ... | 2010 | 20796287 |
| independent evolution of a new allele of f1 pollen sterility gene s27 encoding mitochondrial ribosomal protein l27 in oryza nivara. | loss of function of duplicated genes plays an important role in the evolution of postzygotic reproductive isolation. the widespread occurrence of gene duplication followed by rapid loss of function of some of the duplicate gene copies suggests the independent evolution of loss-of-function alleles of duplicate genes in divergent lineages of speciation. here, we found a novel loss-of-function allele of s27 in the asian annual wild species oryza nivara, designated s27-niv (s), that leads to f(1) po ... | 2010 | 20878142 |
| the genetics of domestication of rice bean, vigna umbellata. | the asian genus vigna, to which four cultivated species (rice bean, azuki bean, mung bean and black gram) belong, is suitable for comparative genomics. the aims were to construct a genetic linkage map of rice bean, to identify the genomic regions associated with domestication in rice bean, and to compare these regions with those in azuki bean. | 2010 | 20880934 |
| gramene database: a hub for comparative plant genomics. | the rich collection of known genetic information and the recent completion of rice genome sequencing project provided the cereal plant researchers a useful tool to investigate the roles of genes and genomic organization that contribute to numerous agronomic traits. gramene ( http://www.gramene.org ) is a unique database where users are allowed to query and explore the power of genomic colinearity and comparative genomics for genetic and genomic studies on plant genomes. gramene presents a wholes ... | 2011 | 20931385 |
| life-table analysis of the performance of nilaparvata lugens (hemiptera: delphacidae) on two wild rice species. | life tables of the planthopper nilaparvata lugens (stål) (hemiptera: delphacidae) on two wild rice species, oryza officinalis wall, ex watt. and oryza rufipogon griff., and on 'taichung native 1' (o. sativa indica tn1) were studied at 27 degrees c in the laboratory. the raw data were analyzed based on the age-stage, two-sex life table to take both sexes and the variable developmental rate among individuals and between sexes into consideration. the intrinsic rate of increase (r), the finite rate ... | 2010 | 21061962 |
| genotypic and phenotypic characterization of genetic differentiation and diversity in the usda rice mini-core collection. | a rice mini-core collection consisting of 217 accessions has been developed to represent the usda core and whole collections that include 1,794 and 18,709 accessions, respectively. to improve the efficiency of mining valuable genes and broadening the genetic diversity in breeding, genetic structure and diversity were analyzed using both genotypic (128 molecular markers) and phenotypic (14 numerical traits) data. this mini-core had 13.5 alleles per locus, which is the most among the reported germ ... | 2010 | 21080033 |
| molecular analysis of an additional case of hybrid sterility in rice (oryza sativa l.). | hybrid sterility hinders the exploitation of the heterosis displayed by japonica × indica rice hybrids. the variation in pollen semi-sterility observed among hybrids between the japonica recipient cultivar and each of two sets of chromosome segment substitution lines involving introgression from an indica cultivar was due to a factor on chromosome 5 known to harbor the gene s24. s24 was fine mapped to a 42 kb segment by analyzing a large f(2) population bred from the cross s24-nil × asominori, w ... | 2010 | 21082325 |
| functional markers developed from multiple loci in gs3 for fine marker-assisted selection of grain length in rice. | the gene gs3 has major effect on grain size and plays an important role in rice breeding. the c to a mutation in the second exon of gs3 was reported to be functionally associated with enhanced grain length in rice. in the present study, besides the c-a mutation at locus sf28, three novel polymorphic loci, sr17, rgs1, and rgs2, were discovered in the second intron, the last intron and the final exon of gs3, respectively. a number of alleles at these four polymorphic loci were observed in a total ... | 2010 | 21107518 |
| al toxicity leads to enhanced cell division and changed photosynthesis in oryza rufipogon l. | oryza rufipogon l. (o. rufipogon) or a common wild rice, showed considerable aluminum (al) tolerance. in this study, we examined the physiologic and genetic response of wild rice short term and long term to al toxicity, respectively. in the short term study, morin staining, dapi staining and aniline blue staining were used to detect al distribution, cell division and callose production in the roots of o. rufipogon. the results indicated cell division could be enhanced by al within low concentrat ... | 2010 | 21132530 |
| global characterization of the root transcriptome of a wild species of rice, oryza longistaminata, by deep sequencing. | oryza longistaminata, an aa genome type (2 n = 24), originates from africa and is closely related to asian cultivated rice (o. sativa l.). it contains various valuable traits with respect to tolerance to biotic and abiotic stress, qtls with agronomically important traits and high ability to use nitrogen efficiently (nue). however, only limited genomic or transcriptomic data of o. longistaminata are currently available. | 2010 | 21159186 |
| transpositional reactivation of two ltr retrotransposons in rice-zizania recombinant inbred lines (rils). | hybridization is prevalent in plants, which plays important roles in genome evolution. apart from direct transfer and recombinatory generation of genetic variations by hybridization, de novo genetic instabilities can be induced by the process per se. one mechanism by which such de novo genetic variability can be generated by interspecific hybridization is transpositional reactivation of quiescent parental transposable elements (tes) in the nascent hybrids. we have reported previously that introg ... | 2010 | 21166796 |
| allelic interaction at seed-shattering loci in the genetic backgrounds of wild and cultivated rice species. | it is known that the common cultivated rice (oryza sativa) was domesticated from asian wild rice, o. rufipogon. among the morphological differences between them, loss of seed shattering is one of the striking characters specific for the cultivated forms. in order to understand the genetic control on shattering habit, qtl analysis was carried out using bc(2)f(1) backcross population between o. sativa cv. nipponbare (a recurrent parent) and o. rufipogon acc. w630 (a donor parent). as a result, two ... | 2010 | 21178306 |
| qtl analysis for flowering time using backcross population between oryza sativa nipponbare and o. rufipogon. | in the near future, global average temperature is expected to increase due to the accumulation of greenhouse gases, and increased temperatures will cause severe sterility in many crop species. in rice, since wild species show high genetic variation, they may have the potential to improve the flowering characters of cultivars. in this study, we investigated flowering characters under natural conditions by comparing an asian wild rice accession of oryza rufipogon w630 (originated from myanmar) wit ... | 2010 | 21178307 |
| timing is everything: early degradation of abscission layer is associated with increased seed shattering in u.s. weedy rice. | seed shattering, or shedding, is an important fitness trait for wild and weedy grasses. u.s. weedy rice (oryza sativa) is a highly shattering weed, thought to have evolved from non-shattering cultivated ancestors. all u.s. weedy rice individuals examined to date contain a mutation in the sh4 locus associated with loss of shattering during rice domestication. weedy individuals also share the shattering trait with wild rice, but not the ancestral shattering mutation at sh4; thus, how weedy rice re ... | 2011 | 21235796 |
| identification of rhizome-specific genes by genome-wide differential expression analysis in oryza longistaminata. | rhizomatousness is a key component of perenniality of many grasses that contribute to competitiveness and invasiveness of many noxious grass weeds, but can potentially be used to develop perennial cereal crops for sustainable farmers in hilly areas of tropical asia. oryza longistaminata, a perennial wild rice with strong rhizomes, has been used as the model species for genetic and molecular dissection of rhizome development and in breeding efforts to transfer rhizome-related traits into annual r ... | 2011 | 21261937 |
| genetic control of a transition from black to straw-white seed hull in rice domestication. | the genetic mechanism involved in a transition from the black-colored seed hull of the ancestral wild rice (oryza rufipogon and oryza nivara) to the straw-white seed hull of cultivated rice (oryza sativa) during grain ripening remains unknown. we report that the black hull of o. rufipogon was controlled by the black hull4 (bh4) gene, which was fine-mapped to an 8.8-kb region on rice chromosome 4 using a cross between o. rufipogon w1943 (black hull) and o. sativa indica cv guangluai 4 (straw-whit ... | 2011 | 21263038 |
| genetic analysis and fine mapping of a novel semidominant dwarfing gene lb4d in rice. | a dwarf mutant, designated lb4d, was obtained among the progeny of backcrosses to a wild rice introgression line. genetic analysis of lb4d indicated that the dwarf phenotype was controlled by a single semidominant dwarfing gene, which was named lb4d. the mutants were categorized as dn-type dwarf mutants according to the pattern of internode reduction. in addition, gibberellin (ga) response tests showed that lb4d plants were neither deficient nor insensitive to ga. this study found that tiller fo ... | 2011 | 21294842 |
| distinctive endophytic fungal assemblage in stems of wild rice (oryza granulata) in china with special reference to two species of muscodor (xylariaceae). | ecological niches in the rhizosphere and phyllosphere of grasses capable of sustaining endophytes have been extensively studied. in contrast, little information regarding the identity and functions of endophytic fungi in stems is available. in this study, we investigated the taxonomic affinities, diversity, and host specificities of culturable endophytes in stems of wild rice (oryza granulata) in china. seventy-four isolates were recovered. low recovery rate (11.7%) indicated that there were rel ... | 2011 | 21369974 |
| diversity and selective sweep in the osamt1;1 genomic region of rice. | ammonium is one of the major forms in which nitrogen is available for plant growth. osamt1;1 is a high-affinity ammonium transporter in rice (oryza sativa l.), responsible for ammonium uptake at low nitrogen concentration. the expression pattern of the gene has been reported. however, variations in its nucleotides and the evolutionary pathway of its descent from wild progenitors are yet to be elucidated. in this study, nucleotide diversity of the gene osamt1;1 and the diversity pattern of seven ... | 2011 | 21385389 |