| photosynthetic bradyrhizobia are natural endophytes of the african wild rice oryza breviligulata. | we investigated the presence of endophytic rhizobia within the roots of the wetland wild rice oryza breviligulata, which is the ancestor of the african cultivated rice oryza glaberrima. this primitive rice species grows in the same wetland sites as aeschynomene sensitiva, an aquatic stem-nodulated legume associated with photosynthetic strains of bradyrhizobium. twenty endophytic and aquatic isolates were obtained at three different sites in west africa (senegal and guinea) from nodal roots of o. ... | 2000 | 11097925 |
| evolutionary relationships among rice species with aa genome based on sine insertion analysis. | previous studies based on morphological and molecular markers indicated that there are two cultivated and five wild rice species within the oryza genus with the aa genome. in the cultivated rice species, oryza sativa, a retroposon named p-sine1 has been identified. some of the p-sine1 members characterized previously showed interspecific insertion polymorphisms in the species with the aa genome. in this study, we identified new p-sine1 members showing interspecific insertion polymorphisms from r ... | 2002 | 12441643 |
| genetic variations of aa genome oryza species measured by mite-aflp. | mites (miniature inverted-repeat transposable elements) are the major transposable elements in oryza species. we have applied the mite-aflp technique to study the genetic variation and species relationship in the aa-genome oryza species. high polymorphism was detected within and between species. the genetic variation in the cultivated species, oryza sativa and oryza glaberrima, was comparatively lower than in their ancestral wild species. in comparison between geographical lineages of the aa gen ... | 2003 | 12845436 |
| a comparative study of genetic relationships among the aa-genome oryza species using rapd and ssr markers. | in order to estimate genetic relationships of the aa-genome oryza species, rapd and ssr analyses were performed with 45 accessions, including 13 cultivated varieties (eight oryza sativa and five oryza glaberrima) and 32 wild accessions (nine oryza rufipogon, seven oryza nivara, three oryza glumaepatula, four oryza longistaminata, six oryza barthii, and three oryza meridionalis). a total of 181 clear and repeatable bands were amplified from 27 selected rapd primers, and 101 alleles were detected ... | 2003 | 14504744 |
| the distribution and effects of genes causing f(1) weakness in oryza breviligulata and o. glaberrima. | weakness of f(1) plants is frequently found in hybrids between strains of oryza breviligulata (wild) and o. glaberrima (cultivated rice) endemic to west africa. a set of two complementary dominant weakness genes, w(1) and w(2), was found to control the observed f(1) weakness. many breviligulata strains had w(1), while most of the glaberrima and semi-wild strains had w(2) or were free of both. in the weak f(1) plants, tissue differentiation in adventitious roots seemed to be disturbed. modifier g ... | 1972 | 17248554 |
| 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 |
| a knowledge-based molecular screen uncovers a broad-spectrum ossweet14 resistance allele to bacterial blight from wild rice. | transcription activator-like (tal) effectors are type iii-delivered transcription factors that enhance the virulence of plant pathogenic xanthomonas species through the activation of host susceptibility (s) genes. tal effectors recognize their dna target(s) via a partially degenerate code, whereby modular repeats in the tal effector bind to nucleotide sequences in the host promoter. although this knowledge has greatly facilitated our power to identify new s genes, it can also be easily used to s ... | 2015 | 26426417 |
| construction of rice chromosome segment substitution lines harboring oryza barthii genome and evaluation of yield-related traits. | rice (oryza sativa l.) is one of the most important staple food in the world. to meet the increasing demand for food, a strategy for improving rice yield is needed. alleles of wild relatives are useful because they confer adaptation to plants under diverse harsh environments and have the potential to improve rice. o. barthii is a wild rice species endemic to africa and the known progenitor of the african cultivated rice, o. glaberrima. to explore the genetic potential of the o. barthii as a gene ... | 2017 | 29085251 |
| genetic analysis of a hybrid sterility gene that causes both pollen and embryo sac sterility in hybrids between oryza sativa l. and oryza longistaminata. | oryza longistaminata originates from african wild rice and contains valuable traits conferring tolerance to biotic and abiotic stress. however, interspecific crosses between o. longistaminata and oryza sativa cultivars are hindered by reproductive barriers. to dissect the mechanism of interspecific hybrid sterility, we developed a near-isogenic line (nil) using indica variety rd23 as the recipient parent and o. longistaminata as the donor parent. both pollen and embryo sac semi-sterility were ob ... | 2017 | 28657614 |
| a single-nucleotide polymorphism causes smaller grain size and loss of seed shattering during african rice domestication. | grain size is one of the most important components of grain yield and selecting large seeds has been a main target during plant domestication. surprisingly, the grain of african cultivated rice (oryza glaberrima steud.) typically is smaller than that of its progenitor, oryza barthii. here we report the cloning and characterization of a quantitative trait locus, gl4, controlling the grain length on chromosome 4 in african rice, which regulates longitudinal cell elongation of the outer and inner g ... | 2017 | 28481332 |
| differences in meristem size and expression of branching genes are associated with variation in panicle phenotype in wild and domesticated african rice. | the african rice oryza glaberrima was domesticated from its wild relative oryza barthii about 3000 years ago. during the domestication process, panicle complexity changed from a panicle with low complexity in o. barthii, to a highly branched panicle carrying more seeds in o. glaberrima. to understand the basis of this differential panicle development between the two species, we conducted morphological and molecular analyses of early panicle development. | 2017 | 28149498 |
| adapting genotyping-by-sequencing for rice f2 populations. | rapid and cost-effective genotyping of large mapping populations can be achieved by sequencing a reduced representation of the genome of every individual in a given population, and using that information to generate genetic markers. a customized genotyping-by-sequencing (gbs) pipeline was developed to genotype a rice f2 population from a cross of oryza sativa ssp. japonica cv. nipponbare and the african wild rice species o. longistaminata while most gbs pipelines aim to analyze mainly homozygous ... | 2017 | 28082325 |
| a single base change explains the independent origin of and selection for the nonshattering gene in african rice domestication. | reduced seed shattering was a critical evolutionary step in crop domestication. two cultivated rice species, oryza sativa and oryza glaberrima, were independently domesticated from the wild species oryza rufipogon in asia and oryza barthii in africa, respectively. a single nucleotide polymorphism (snp) in the c gene, which encodes a trihelix transcription factor, causes nonshattering in o. sativa. however, the genetic mechanism of nonshattering in o. glaberrima is poorly understood. we conducted ... | 2017 | 27861933 |
| development and validation of cross-transferable and polymorphic dna markers for detecting alien genome introgression in oryza sativa from oryza brachyantha. | african wild rice oryza brachyantha (ff), a distant relative of cultivated rice oryza sativa (aa), carries genes for pests and disease resistance. molecular marker assisted alien gene introgression from this wild species to its domesticated counterpart is largely impeded due to the scarce availability of cross-transferable and polymorphic molecular markers that can clearly distinguish these two species. availability of the whole genome sequence (wgs) of both the species provides a unique opportu ... | 2016 | 27299359 |
| evolutionary trajectory of phytoalexin biosynthetic gene clusters in rice. | plants frequently possess operon-like gene clusters for specialized metabolism. cultivated rice, oryza sativa, produces antimicrobial diterpene phytoalexins represented by phytocassanes and momilactones, and the majority of their biosynthetic genes are clustered on chromosomes 2 and 4, respectively. these labdane-related diterpene phytoalexins are biosynthesized from geranylgeranyl diphosphate via ent-copalyl diphosphate or syn-copalyl diphosphate. the two gene clusters consist of genes encoding ... | 2016 | 27133567 |
| mir2118-triggered phased sirnas are differentially expressed during the panicle development of wild and domesticated african rice species. | rice exhibits a wide range of panicle structures. to explain these variations, much emphasis has been placed on changes in transcriptional regulation, but no large-scale study has yet reported on changes in small rna regulation in the various rice species. to evaluate this aspect, we performed deep sequencing and expression profiling of small rnas from two closely related species with contrasting panicle development: the cultivated african rice oryza glaberrima and its wild relative oryza barthi ... | 2016 | 26969003 |
| genome and comparative transcriptomics of african wild rice oryza longistaminata provide insights into molecular mechanism of rhizomatousness and self-incompatibility. | | 2015 | 26358679 |
| the biosynthesis, structure and gelatinization properties of starches from wild and cultivated african rice species (oryza barthii and oryza glaberrima). | the molecular structure and gelatinization properties of starches from domesticated african rice (oryza glaberrima) and its wild progenitor (oryza barthii) are determined and comparison made with asian domesticated rice (oryza sativa), the commonest commercial rice. this suggests possible enzymatic processes contributing to the unique traits of the african varieties. these have similar starch structures, including smaller amylose molecules, but larger amounts of amylose chains across the whole a ... | 2015 | 26050893 |
| rapid diversification of five oryza aa genomes associated with rice adaptation. | comparative genomic analyses among closely related species can greatly enhance our understanding of plant gene and genome evolution. we report de novo-assembled aa-genome sequences for oryza nivara, oryza glaberrima, oryza barthii, oryza glumaepatula, and oryza meridionalis. our analyses reveal massive levels of genomic structural variation, including segmental duplication and rapid gene family turnover, with particularly high instability in defense-related genes. we show, on a genomic scale, ho ... | 2014 | 25368197 |
| the genome sequence of african rice (oryza glaberrima) and evidence for independent domestication. | the cultivation of rice in africa dates back more than 3,000 years. interestingly, african rice is not of the same origin as asian rice (oryza sativa l.) but rather is an entirely different species (i.e., oryza glaberrima steud.). here we present a high-quality assembly and annotation of the o. glaberrima genome and detailed analyses of its evolutionary history of domestication and selection. population genomics analyses of 20 o. glaberrima and 94 oryza barthii accessions support the hypothesis ... | 2014 | 25064006 |
| physiological and molecular characterization of si uptake in wild rice species. | cultivated rice (oryza sativa) accumulates high concentration of silicon (si), which is required for its high and sustainable production. high si accumulation in cultivated rice is achieved by a high expression of both influx (lsi1) and efflux (lsi2) si transporters in roots. herein, we physiologically investigated si uptake, isolated and functionally characterized si transporters in six wild rice species with different genome types. si uptake by the roots was lower in oryza rufipogon, oryza bar ... | 2014 | 24320720 |
| plant regeneration from leaf and seed-derived calli and suspension cultures of the african perennial wild rice, oryza longistaminata. | plant regeneration from 2-month-old callus cultures derived from immature leaves of 7-day-old aseptic seedlings and mature embryos of the african wild rice oryza longistaminata was achieved at 20% and 100% frequency, respectively. the morphogenic potential of the embryo-derived calluses dropped from 100% at the third subculture to 12.5 % at the 12th subculture. five-month-old morphogenic calluses were used to establish a fast-growing suspension culture which, when plated onto semisolid medium, s ... | 1990 | 24227175 |