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Subject: Genetics × Author: Gollen, Babita ×
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    ThesisItemOpen Access
    Combining ability analysis for spike traits and other yield attributes in bread wheat (Triticum aestivum L. em Thell)
    (CCSHAU, 2009) Gollen, Babita; Yadav, R.K.
    Line x tester analysis involving twelve diverse wheat genotypes (HD2009M, R-6, R-49, HT90, HJP81, SG215, DI717, HS-11, HS-17, HG-2, Rm-Ts13 and HS-27 as lines in combination with six genotypes (WH711, PBW502, Rm-Ts10, Rm-Ts17, C591 and RVG) as testers was conducted by raising the experimental material at the research farm of the Department of Genetics during Rabi 2008. It has been exhibited that PCV is higher than the respective GCV and however, it is slightly lower for most of the characters thus indicating a high magnitude of heritability estimate in broad sense for most of the characters in general. Estimates of combining ability and magnitude of association between various character combinations have been worked out. The results indicated the existence of adequate genetic variation for all the characters studied. Both additive and non-additive type of genetic variance prevailed. C591 and Rm-Ts10 among the testers and HD2009M, HS-17, HG-2, DI717, R-6 and SG215 among the lines were found as good general combiners for one or the other characters. HS-17 for days to heading, HG-2 for plant height and peduncle length, R-6 for 100-grain weight, DI717 for number of grains per spike, SG215 for yield per plant have high GCA effects. Higher SCA effect was observed in the cross HD2009M x PBW502 followed by HS-27 x Rm-Ts10 and HG-2 x WH711 for the character number of grains per spike indicating the preponderance of non-additive gene action in these crosses. WH711 had positive SCA effects in six, PBW502 in nine, Rm-Ts10 in twelve,Rm-Ts17 in nine , RVG in ten and C591in twelve cross combinations. Most of the cross combination involve either both lines and testers or one of the parents as showing good combining ability thus indicating the importance of both additive and non-additive type of gene action. The coefficient for genotypic correlation for most of the character combination was higher in magnitude as compared to corresponding phenotypic correlation coefficient indicating the strong inherent nature of the traits. Grain yield per plant had a strong positive association with days to heading, plant height, peduncle length, tillers per plant, spike biomass and weight of grains per spike by considering both homozygous and heterozygous nature of material. Only few cases of correlation coefficients for the character combinations as per the pattern of heterozygous material has been visualized from the homozygous material which reveals that most traits are under the influence of polygenes and the heterozygous combination for them as has been obtained in various forms depending upon the parents. The informations generated from the present investigation may be utilized by involving good general combiners and the specific crosses that are likely to transgrants for various characters individually or in combination and appropriate breeding approach has been suggested.