STUDIES ON HETEROSIS, GENE ACTION AND STABILITY OF F1 HYBRIDS IN MAIZE (Zea mays L.) FOR YIELD AND YIELD COMPONENTS

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dc.contributor.advisorDr. M. REDDI SEKHAR
dc.contributor.authorSURYANARAYANA, LIMMAKA
dc.date.accessioned2018-08-08T03:45:14Z
dc.date.available2018-08-08T03:45:14Z
dc.date.issued2017
dc.descriptionD5224en_US
dc.description.abstractThe present investigation was undertaken to elicit information on combining ability, heterosis and stability of maize hybrids for yield and yield components of promising hybrids over six environments (seasons) and also to identify donor parents having favourable alleles for grain yield and its components for improving the target cross BML 6 × BML 7. During kharif 2013, 30 maize inbred lines were evaluated for genetic divergence using Mahalanobis D2, wards minimum variance and principal component analysis. The analysis of variance revealed the existence of significant differences among the 30 inbred lines for 21 characters indicating the presence of genetic variability in the breeding material. High heritability coupled with high genetic advance as per cent of mean recorded for plant height, ear height, ear length, number of kernels per row, 100 kernel weight, grain yield per plant, LAI at 30, 60 and 90 DAS, LAD at 30-60 and 60-90 DAS, SCMR and stover yield per plant indicated the operation of additive gene effects in the genetic variations of these traits. Genetic divergence analysis through Mahalanobis D2, wards minimum variance and principal component analysis classified 30 maize inbred lines in six divergent clusters. In D2 analysis, grain yield per plant, stover yield per plant, number of kernels per row, LAI at 30 DAS, ear height, SCMR and days to 50% tasseling contributed maximum for the divergence. While in PCA the characters viz., LAD at 60-90 DAS, days to maturity, plant height, number of kernel rows per ear, ear height and LAD at 30-60 DAS contributed more towards variability. Forty crosses were generated by involving ten inbred lines and four testers in a Line × Tester fashion during rabi 2013. Divergent inbred lines from divergent clusters were selected as lines and testers for hybridization programme based on Mahalanobis D2 statistics and principal component analysis. The evaluation of crosses for combining ability, heterosis and stability along with their parents and standard checks was done over six environments i.e., kharif 2014 (early kharif, kharif and late kharif) and rabi, 2014 (early rabi, rabi and late rabi) at Agricultural College Farm, Naira. The pooled combining ability analysis of variance showed significant differences due to locations, parents, hybrids and various interactions indicating the existence of sufficient variation in the material under study. The ratio of general combining ability component of variance to specific combining ability component of variance revealed the presence of additive gene action for ear length and ear girth, the traits governed by additive gen action can be improved through hybridization followed by simple selection. Whereas, non-additive gene action was predominant for remaining characters The estimates of gca effects among the lines MRC 185, MRC 139 and testers BML 10 and RSK was significant in desirable direction for grain yield and yield contributing traits and found to be good general combiners for grain yield per plant. The crosses involving good general combiners MRC 185 × BML 10, MRC 139 × BML 10 and MRC 185 × RSK 14 expressed high per se performance and sca effects for grain yield per plant and other yield contributing characters. G × E interaction studies at six environments for yield and yield attributes by Eberhart and Russell model revealed the cross MRC 216 × BML 10 to be stable for grain yield per plant over environments. Whereas, in the AMMI model the crosses viz., MRC 216 × RSK 14, MRC 126 × RSK 14, MRC 163 × MRC 202, MRC 139 × MRC 202, MRC 216 × BML 10 and MRC 186 × RSK 14 were found to be stable for grain yield per plant with mean higher than the grand mean and IPCA score nearer to zero. The identification of unique favourable alleles in donor inbreds for improving the target cross, BML 6 × BML 7 revealed that, the donors, RSK 14, BML 10 and MRC 202 recorded the highest significant positive μG' estimates indicating their worth in transferring favourable alleles in the target cross for ear length, number of kernel rows and grain yield per plant.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810063665
dc.keywordsHETEROSIS, GENE ACTION, F1 HYBRID, MAIZE (Zea mays L.)en_US
dc.language.isoen_USen_US
dc.pages424en_US
dc.publisherAcharya N.G. Ranga Agricultural Universityen_US
dc.research.problemSTUDIES ON HETEROSIS, GENE ACTION AND STABILITY OF F1 HYBRIDS IN MAIZE (Zea mays L.) FOR YIELD AND YIELD COMPONENTSen_US
dc.subGenetics and Plant Breedingen_US
dc.subjectnullen_US
dc.themeSTUDIES ON HETEROSIS, GENE ACTION AND STABILITY OF F1 HYBRIDS IN MAIZE (Zea mays L.) FOR YIELD AND YIELD COMPONENTSen_US
dc.these.typePh.Den_US
dc.titleSTUDIES ON HETEROSIS, GENE ACTION AND STABILITY OF F1 HYBRIDS IN MAIZE (Zea mays L.) FOR YIELD AND YIELD COMPONENTSen_US
dc.typeThesisen_US
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