“COMBINING ABILITY AND GENE ACTION FOR YIELD AND QUALITY TRAITS IN RICE (Oryza sativa L.)”

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dc.contributor.advisorSarawagi, A.K.
dc.contributor.advisorSharma, Deepak
dc.contributor.advisorPandey, N.
dc.contributor.advisorSaxena, R.R.
dc.contributor.advisorVerulkar, S.B.
dc.contributor.authorDhanwani, Rakesh Kumar
dc.date.accessioned2016-12-22T12:23:54Z
dc.date.available2016-12-22T12:23:54Z
dc.date.issued2009
dc.description.abstractA study entiltled “Combining ability and gene action for yield and quality traits in rice (Oryza sativa L.)”was conducted at Research Farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C. G.) and at R.M.D., College of Agriculture and Research Station, Ambikapur, to determine the extent of variability, to access the GCA effects of parents and SCA effects of crosses; to identify the potential parents and crosses, to study the type of gene action involved for yield and quality traits, to study the correlations and path coefficient among important traits and to determine the resistant reaction of some of the parent and their F1 for blast disease. The experimental material consists of four lines viz. R 1519-781-5-598-1, R 1540-1888-1278-1, R 1558-2423-3-1445-1, R 1529-1183-1-1041-1 and six testers viz., B 6441-FMR-6-0-0, IR 42221-145-2-3-2, BR 240, IRBL 10, Swarna and Cheptigurmatia and resulting twenty four hybrids were produced in line x tester pattern. The parents and hybrids were raised in a Complete Randomized Block Design with two replications during kharif 2008. Observations were recorded for the different 32 quantitative and quality characters viz. days to 50 per cent flowering, plant height, tiller number per plant, effective tiller number per plant, flag leaf area, panicle length, filled grains per panicle, unfilled grains per panicle, spikelet sterility percentage, seed index, biological yield per plant, grain yield per plant, harvest index, paddy length, paddy breadth, paddy L/B ratio, brown rice length, brown rice breadth, brown rice L/B ratio, kernel length, kernel breadth, kernel L/B ratio, kernel length after cooking, kernel breadth after cooking, kernel L/B ratio after cooking, hulling percentage, milling percentage, head rice recovery, elongation, water uptake, alkali spreading value and water uptake. The mean performance of different quantitative and quality characters is workout. The phenotypic coefficient of variation was higher in magnitude than that of genotypic coefficient of variation for all the characters studied. High genotypic and phenotypic coefficients of variation were recorded for the quality characters viz. alkali spreading value, gel consistency, biological yield per plant, grain yield per plant, unfilled grains per panicle, filled grains per panicle, water uptake and spikelet sterility percentage. In general heritability estimates were recorded high for all the characters under study. In the present study the characters which showed high heritability associated with high genetic advance are alkali spreading value, gel consistency, biological yield per plant, grain yield per plant, filled grains per panicle and unfilled grains per panicle. Analysis of variance revealed that variance due to the line x tester was significant for all the characters. This suggested that sufficient variability is present in materials used for present study. Combining ability analysis was carried out following line x tester analysis. The analysis revealed the predominance of non-additive gene action for the thirty two characters under study. This suggests the possibility of exploiting heterosis in the materials. Among the female parents R 1540-1888-1278-1 and R 1529-1183-1-1041-1 were found as good general combiner for yield and quality traits respectively. Among the testers Cheptigurmatia, B6441-FMR-6-0-0 and IR 42221-145-2-3-2 and BR 240 were found good general combiners for yield and quality traits respectively. Hybrids R 1558-2423-3-1445-1/Cheptigurmatia and R 1540-1888-1278-1 /Swarna were best specific combiner for grain yield and its related characters, while R 1558-2423-3-1445-1/ B 6441-FMR-6-0-0 and R 1540-1888-1278-1/Swarna for kernel dimensions; R 1558-2423-3-1445-1/ Cheptigurmatia for hulling, milling and head rice recovery; R 1540-1888-1278-1/ B 6441-FMR-6-0-0 for water uptake, R 1540-18881278-1/IRBL 10 for alkali spreading value and R 1558-2423-3-1445-1/BR 240 for gel consistency were found best specific combiners. . In correlation studies, grain yield per plant was highly positively correlated with the flag leaf area, panicle length, filled grains per panicle, hundred seed weight and kernel length after cooking at both genotypic and phenotypic level while with days to 50% flowering, spikelet sterility percentage, alkali spreading value and gel consistency, it was negatively correlated at genotypic level. Based on path analysis of important characters, positive direct effects on grain yield revealed that panicle length, effective tiller number per plant, kernel length after cooking and filled grain per panicle were most important contributing characters towards the yield.en_US
dc.identifier.citation180 p.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/92161
dc.language.isoenen_US
dc.publisherIndira Gandhi Krishi Vishwavidyalaya, Raipuren_US
dc.subGenetics and Plant Breedingen_US
dc.subjectCOMBINING ABILITY, GENE ACTION, QUALITY TRAITS, RICE (Oryza sativa L.)en_US
dc.these.typeM.Sc
dc.title“COMBINING ABILITY AND GENE ACTION FOR YIELD AND QUALITY TRAITS IN RICE (Oryza sativa L.)”en_US
dc.typeThesisen_US
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