Combining ability analysis for seed cotton yield and its attributing traits in upland cotton (Gossypium hirsutum L.)

摘要

The present investigation aims to obtain information on the magnitude of gca variances and gca effects for individual parents and sea variances and sea effects of Gossypium hirsutum hybrids for seed cotton yield and its attributes viz., days to firstflower (earliness), bolls/plant, boll weight, plant height, monopodia and sympods/plant. Five females crossed with ten testers in line x tester mating fashion resulting 50 hybrids were obtained. Fifty hybrids along with their 15 parents and one standardcheck were raised during kharif 2016-2017 in a randomized block design with three replications at CCS Haryana Agricultural University, Cotton Research Station, Sirsa. The study revealed that Gregg 45, MESR 17, SR 38 and Pusa 31 among the males while, theH1300 and H1098i among females were found to be good general combiner with highest per se performance for all the traits studied. Among the crosses, Hl 117 x LRA 5166 (poor x poor GCA), H1226 x SR 38 (good x good GCA), H1098i x PUSA 31 (good x good GCA)and H1300 x AVB SM 277 (good x poor GCA) exhibited high per se performance with good SCA effects for seed cotton yield and its yield attributes in desirable direction. The magnitude of SCA variance was greater than GCA variance for all the traits that specified predominance of non additive gene action which is important in exploitation of heterosis through hybrid breeding.