| analysis of genes controlling f(1) sterility in rice by the use of isogenic lines. | in order to look into the genetic basis of intervarietal f(1) sterility in rice (oryza sativa l.), a series of backcrosses (up to b(13)) was carried out using taichung 65 (japonica type) as the recurrent parent and several indica varieties as donor parents. a number of "isogenic f(1)-sterile lines" were isolated by test-crossing fertile f(2) plants obtained from the selfing of partly pollensterile backcross segregants. crossing experiments with the isogenic lines confirmed the author's previous ... | 1974 | 17248657 |
| metabolism of tritiated gibberellin a(9) by shoots of dark-grown dwarf pea, cv. meteor. | tritium-labeled gibberellin a(9) ((3)h-ga(9)) was metabolized by etiolated shoots of dwarf pea (pisum sativum cv. meteor) to ga(20), ga(10), 2,3-dihydro-ga(31), and a number of highly polar, acidic ga-like substances. identifications were made by gasliquid radiochromatography and combined gas chromatography-mass spectrometry. kinetic studies showed that ga(30) and 2,3-dihydro-ga(31) were produced within 5 hours following (3)h-ga(9) application to pea shoots. the polar ga-like substances were pro ... | 1974 | 16658838 |
| [phenomenon of radioprotection by previous imbibition at low temperature observed in rice seeds (oryza sativa l.) subjected to gamma rays of co60]. | | 1974 | 4210673 |
| isolation of nuclei from rice tissue grown in suspension culture. | a simple method is described for the isolation of intact nucleic from rice tissue (oryza sativa l.) grown in suspension culture. the procedure involves incubation of the tissue for 4 h with cellulase and pectinase prior to disruption of the cells. the yield of nucleic is approximately 40% (dna basis) and the preparations are capable of synthesizing rna in vitro. the method may be valuable to biochemically oriented research requiring plant nuclei. | 1974 | 24442660 |
| studies on some genetic parameters of rice (oryza sativa l.). | in order to utilize the available useful variation in breeding rice to improve yield and quality of grain, the performance of a wide range of rice germ plasm comprising 30 varieties was evaluated in northern india, a major rice growing belt. plant performance revealed high genetic divergence and phenotypic variability in the crop, with the maximum range of variation being for grain number per panicle and the minimum for grain dimensions. there were also significant differences among varietal mea ... | 1974 | 24425460 |
| effect of x-irradiation on the size of the mutated sector in diploid and tetraploid rice. | an investigation was carried out of the effect of x-irradiation on the size of the mutated sector in three diploids (a.s.d.8, t.n. 1 and g.e.b. 24) and the autotetraploid of g.e.b 24 of oryza sativa l., by analyzing the m2 segregation ratios of chlorophyll mutants. a total of 612 segregating m1 panicle progenies in the diploids and 284 panicle progenies in the tetraploid was studied in the m2 generation for the ratio of normal to chlorophyll mutant seedlings. of the 573 segregating m1 panicles a ... | 1974 | 24424476 |
| complementary genic complex for anthocyanin pigmentation in the apiculus of rice (oryza sativa l.). | | 1973 | 4781370 |
| changes in the activity of some hydrolases, peroxidase, and catalase in the rice seed during germination. | a study was made of the changes in activity of enzymes involved in the breakdown of stored phytin, lipid, and hemicellulose in the aleurone layer of rice seed (oryza sativa l., variety ir8) during the 1st week of germination in the light. enzyme assays were made on crude extracts from degermed seed, and activities were expressed on a per seed basis. phytase activity increased within the 1st day of germination. the increase in activity of most other enzymes-phosphomonoesterase, phosphodiesterase, ... | 1973 | 16658546 |
| effect of anaerobiosis on respiratory rate, cytochrome oxidase activity and mitochondrial structures in coleoptiles of rice (oryza sativa l.). | | 1973 | 4352691 |
| protein metabolism in leaves and developing grains of rices differing in grain protein content. | four semi-dwarf rices (oryza sativa l.) differing in percentage of grain protein, grown in a flooded field receiving basal n fertilization, had a peak activity of root glutamate dehydrogenase 4 weeks after transplanting. a lower peak occurred during panicle formation 10 weeks after transplanting. the percentage of n of the active leaf blades was also highest 4 weeks after transplanting. the activity of nitrate reductase in the leaf blades was low and decreased after transplanting.among the three ... | 1973 | 16658365 |
| biochemical changes in the rice grain during germination. | changes in the content of starch, protein, and rna and in the activity of their hydrolases in the rice endosperm (oryza sativa l., variety ir8) were determined during the first week of germination without added nutrient both in the dark and in the light. changes were generally more rapid in the dark than in the light. oxygen uptake and rnase activity started to increase and the root protruded on the second day, followed by the coleoptile on the third day, and the primary leaf on the fourth day. ... | 1972 | 16658042 |
| electron-probe microanalysis of silicon in the epidermis of rice (oryza sativa l.) internodes. | electron-probe x-ray microanalysis showed that significant amounts of silicon are accumulated in the entire epidermal system of the rice internode except in the stomatal apparatuses. thus, there is a lack of specific sites for si deposition from levels just above the base to the tip of the rice internode. in the intercalary meristem region, 1 cm above the base of the internode, point-count data indicate more si accumulation in the dumb-bell shaped silica cells than in the long epidermal cells. a ... | 1972 | 24481653 |
| intra and inter subspecific variation in soluble proteins of oryza sativa l. | types representing three subspecies of oryza sativa, namely, indica, japonica and javanica, and a group of intermediate types collected from north east india, were studied for variation in soluble proteins using acrylamide gel electrophoresis. the study revealed that there was a marked variation within and between varietal groups. variability for number and intensity of protein bands in indica was wider than in japonica and javanica. protein pattern in the group comprising n.e. indian types tran ... | 1972 | 24429488 |
| efficiency of glasshouse pot experiments rotating versus stationary benches. | pot cultures of rice (oryza sativa l., var. colusa) in flooded soil were used to measure comparative uniformity of growth where mutual shading was the primary source of variation. data were analyzed according to various divisions of each layout into blocks, sections, and replicate pots to compare statistical efficiencies.experiments on stationary benches were subject to large border effects that were not suitably compensated for by any of the systems of replication tested. on the turntable, whic ... | 1971 | 16657881 |
| effect of certain chemical fertilizers on the rhizosphrere mycoflora of oryza sativa linn. ii. potassium fertilizer (potassium sulphate). | | 1971 | 5129428 |
| phytochrome action in oryza sativa l: iv. red and far red reversible effect on the production of ethylene in excised coleoptiles. | excised apical segments of etiolated rice (oryza sativa l.) coleoptiles produced ethylene. increasing the number of cut sites per coleoptile increased the rate of ethylene formation. ethylene produced by an etiolated-intact seedling in the dark was about a half of that by the excised coleoptile segment. red light of low energy as well as of continuous irradiation inhibited the production of ethylene. the inhibition by a low energy dose of red light was partly relieved, if the red light was follo ... | 1971 | 16657772 |
| investigations into rhizosphere microflora. i. succession of microflora on root regions of oryza sativa l. | | 2000 | 5159954 |
| [anaerobic phenomena in plants. ii. experimental studies on the relationships between anaerobiosis phenomena and catalase in caryopses of oryza sativa]. | | 2015 | 5146120 |
| effect of certain chemical fertilizers on the rhizosphere myco-flora of oryza sativa. i. nitrogenous fertilizers: ammonium nitrate and urea. | | 1971 | 5575838 |
| some observations on coleoptile cell ultrastructure in ungerminated grains of rice (oryza sativa l). | the ultrastructure of coleoptile cells of ungerminated rice grains has been examined following fixation in glutaraldehyde and osmium tetroxide. in many respects the cell structure resembles that reported for other dormant seed tissues: the cells contain protein bodies and lipid droplets, mitochondria and plastids show little internal structure but cytoplasm invaginates into many plastids; golgi cisternae cannot be discerned. rough er is present as cisternae surrounding protein bodies, as occasio ... | 1971 | 24482086 |
| starch metabolism in the leaf sheaths and culm of rice. | the levels of starch and dextrin, free sugars, soluble protein, and enzymes involved in starch metabolism-alpha-amylase, beta-amylase, phosphorylase, q-enzyme, r-enzyme, and adp-glucose starch synthetases-were assayed in the leaf sheaths and culm of the rice plant (oryza sativa l., variety ir8) during growth.starch accumulation in the leaf sheaths reached a maximum 10 to 11 weeks after transplanting, the time of development of the rice panicle. maximal concentration of free sugars occurred earli ... | 1971 | 16657631 |
| dissociation of ribosomes and seed germination. | ribosomes from rice embryos (oryza sativa) were dissociated into ribosomal subunits in vitro by systematic reduction of the mg(2+) concentration. ribosomes from imbibed (28 c) embryos were more easily dissociated than those from nonimbibed embryos. this was not observed with ribosomes from either imbibed, nonviable embryos, or from embryos imbibed at 0 c. ribosomes from embryos which had been imbided and subsequently dehydrated resembled ribosomes from nonimbibed embryos in their resistance to d ... | 1971 | 16657584 |
| biochemical factors affecting protein accumulation in the rice grain. | rice grains (oryza sativa l.) from three varieties and three pairs of lines with different protein content were collected at 4-day intervals from 4 to 32 days after flowering. the samples were analyzed for protein, free amino nitrogen, ribonucleic acid, protease activity, and ribonuclease activity. in addition, the capacity of the intact grain to incorporate amino acids was determined for the three pairs of lines. the maximal level of free amino nitrogen and the capacity of the developing grain ... | 1970 | 16657540 |
| enzymic mechanism of starch breakdown in germinating rice seeds: iii. alpha-amylase isozymes. | the formation of amylase isozymes in germinating rice (oryza sativa) seeds was studied by isoelectric focusing on polyacrylamide gel disc electrophoresis. time sequence comparisons of the amylase zymogram were made between extracts from gibberellic acid-treated embryoless and embryo-attached half-endosperm of rice seeds. in both cases, 4 major and 9 to 10 minor isozyme bands were detectable at the maximal stage of the enzyme induction. however, in the embryo-attached half-seeds, bands started to ... | 1970 | 16657524 |
| phytochrome action in oryza sativa l. : v. effects of decapitation and red and far-red light on cell wall extensibility. | the mechanical properties of the cell wall were measured in coleoptiles of totally etiolated rice seedlings. coleoptiles were either decapitated or briefly exposed to red (r) and/or far-red (fr) light. the elastic and plastic extensibilities of the cell wall changed with age (length) of the coleoptiles. decapitation and exposure to r induced changes in these properties, and the time-courses were similar. following decapitation or r irradiation, the plastic extensibility of the cell wall decrease ... | 1970 | 24499836 |
| mutagen-induced variability in protein characters in oryza sativa. | | 1970 | 5433772 |
| the induction of grain size and colour mutations in rice (oryza sativa l.) by radioisotopes. | seven mutants with changes in grain size and in pigmentation of various organs were isolated in the m 2 and m 3 generations of the patnai variety of winter rice after treatment with (32) p and (35) s. some of these could be useful for breeding.the narrow grain mutant, isolated in the m 3 generation after treatment with (32) p, was high-yielding and had fine grains and an increased number of long panicles.two short grain mutants with changed husk colour were obtained in the m 2 generation after t ... | 1970 | 24435806 |
| the induction of nitrate reductase and the preferential assimilation of ammonium in germinating rice seedlings. | nitrate reduotase is induced by nitrate in excised embryos and germinating intact seedlings of rice (oryza sativa l.). the enzyme is induced 24 hr after imbibition. the rate of enzyme formation increases with the age of seedlings. there is a lag period of 30 to 40 min between the addition of substrate and the formation of nitrate reductase. formation of the enzyme is promoted by the presence of ammonium. chloramphenicol, actinomycin d and cycloheximide effectively inhibit the formation of nitrat ... | 1969 | 16657253 |
| involvement of aminoacyl-trna transfer factors in polyphenylalanine synthesis by rice embryo ribosomes. | two distinct heat labile factors (i and ii) were found to be required for the in vitro synthesis of polyphenylalanine by rice ribosomes (oryza sativa var. bluebonnct) and polyuridylic acid. these factors were present in both the crude supernatant and on crude ribosomes. factor i was removed from the crude ribosomes by [ill] (0.6%), while factor ii was eliminated from deoxycholate washed ribosomes by a 0.5 m kcl wash.factor i was purified from crude supernatant by calcium phosphate absorption and ... | 1969 | 16657179 |
| phytochrome action in oryza sativa l. 3. the separation of photoperceptive site and growing zone in coleoptiles, and auxin transport as effector system. | | 1969 | 5359044 |
| phytochrome action in oryza sativa l. : ii. the spectrophotometric versus the physiological status of phytochrome in coleoptiles. | in-vivo phytochrome determinations in totally etiolated rice seedlings with a dual-wavelength spectrophotometer showed that on a fresh weight basis phytochrome concentration was highest in the coleoptile apex (0.175 of mean) δ(δ o.d.) g(-1) (fresh weight). the age of the seedlings had little effect on the pattern of phytochrome distribution in the coleoptiles.the extent of growth inhibition observed 2 days after the irradiations was proportional to the logarithm of p fr amount in the coleoptiles ... | 1968 | 24519726 |
| [inhibitory action of ethanol on germination of rice (oryza sativa l.) and wheat (triticum vulgare) seeds]. | | 1968 | 5761008 |
| mechanism of selective action of 3',4'-dichloropropionanilide. | studies have been carried out to determine the basis for the unique postemergence selective action of the rice herbicide, 3',4'-dichloropropionanilide (dpa), which controls a wide variety of weed species including barnyardgrasses. absorption studies have shown that both rice (oryza sativa, l.) and barnyardgrass (echinochloa crusgalli, l.) foliage absorb dpa readily and equally and, consequently, morphological differences cannot account for its unique selective action. through the use of uniforml ... | 1968 | 5700023 |
| metabolic fate of 3,4-dichloropropionanilide in plants: the metabolism of the propionic acid moiety. | 3,4-dichloropropionanilide-(14)c (propanil) labeled in either the c-1 or c-3 carbon atoms of the propionic acid moiety was applied to the roots of pea (pisum sativum l.) and rice (oryza sativa l.) plants in nutrient solution (0.1 mm-0.28 mm). radioactivity was detected throughout the treated plants, but the greatest labeling was found in the roots. none of the products that contained aniline were radioactive, suggesting that the plants split the propionic acid moiety from propanil. the fate of t ... | 1968 | 16656804 |
| metabolism of 3,4-dichloropropionanilide in plants: the metabolic fate of the 3,4-dichloroaniline moiety. | studies to elucidate the fate of 3,4-dichloropropionanilide (propanil) in rice (oryza sativa l. var. nato) plants have shown that the propanil molecule is cleaved and the propionic acid moiety metabolized. to ascertain the fate of the 3,4-dichloroaniline moiety of propanil, rice plants were exposed to propanil in liquid culture. the roots and shoots of treated rice plants were extracted and quantitatively assayed for four aniline-containing metabolites. one of the four metabolites proved to be 3 ... | 1968 | 5635999 |
| phytotoxicity tests with the molluscicide n-tritylmorpholine. | n-tritylmorpholine (frescon, wl 8008) has been applied as an emulsifiable concentrate (fx 28) to cotton and rice in glasshouse experiments without any adverse effects. the compound was applied in the irrigation water at 5 and 10 times the rates used for snail control. the experiment on cotton was terminated after 60 days, when the plants became pot-bound. the treatments did not affect the leaf area or the fresh weight of plants. the rice (oryza sativa ssp. japonica) was harvested and no differen ... | 1967 | 5300052 |
| nitrate reductase of rice (oryza sativa l.) under foot-rot disease. | studies reported here reveal a low nitrate reductase activity in the shoots of mtu 9 rice plants while in roots high enzyme activity has been recorded.under pathogenesis, a low nitrate reductase activity in the roots and a high enzyme activity in the shoots have been recorded in susceptible rice plants. in the resistant rice plants (geb 24) no such marked difference in the enzyme activity has been observed.the effect of fusaric and gibberellic acid on this enzyme activity has been studied. in th ... | 1966 | 24554010 |
| differential radiosensitivity in rice (oryza sativa linn.) at the genotypic level. | | 1961 | 13750639 |
| peculiar physiological behavior in rice (oryza sativa). | | 1954 | 13186837 |
| [behavior of interspecific hybrids of oryza sativa l. and o. glaberrina steud]. | | 1953 | 13051899 |
| morphology of the ovary of oryza sativa linn. var. plena ("double rice"). | | 1951 | 14828377 |
| some observations on an obscure disease of paddy; oryza sativa. | | 1949 | 15395342 |
| linkage studies of awn in cultivated rice (oryza sativa l.). | | 1946 | 20995077 |
| studies on the anaerobic decomposition of plant materials: some factors influencing the anaerobic decomposition of rice straw (oryza sativa). | | 1935 | 16745749 |
| studies on the anaerobic decomposition of plant materials: the anaerobic decomposition of rice straw (oryza sativa). | | 1935 | 16745695 |