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Andhra Pradesh Agricultural University (1986)

Effect of recurrent selection on general and ,specific combining abilities of two random-mating Sorghum populations (Sorghum Bicolor (L.) Moench)

Hashi, M D

Titre : Effect of recurrent selection on general and ,specific combining abilities of two random-mating Sorghum populations (Sorghum Bicolor (L.) Moench).

Auteur : Hashi, M D

Etablissement de soutenance : Andhra Pradesh Agricultural University.

Grade : Master of Science (1986)

Résumé
Combining ability effects of 48 FI hybrids obtained by Crossing 4 male-sterile lines with five cycles of recurrent Selection plus the original population, each from two randomnating sorghum populations, were evaluated to determine the Effect of recurrent selection on GCA and SCA effects and to Estimate the progress made during the five cycles of recurrent selection. A randomized complete block design with three replications of the 48 Fl hybrids was grown at ICRISAT Center during the 1984 rainy season (Kharif) and at Bhavanisagar, under irrigation, during the Summer season of 1985. The combining ability analysis followed a line x tester (A-lines) mating system. Significant variations were observed among the A-lines and the cycles of the populations for all the characters studied. The cycles within populations showed larger variations for grain weight and panicle weight than the A-lines while the variations of the A-lines were larger for most of the yield components Five cycles of recurrent selection have been effective in increasing the grain yield of the two populations and resulted in simultaneous improvement of all the other traits in the desired direction except panicle length and IOO-seed weight which remained unchange Recurrent selection practised earlier for grain yield was effective primarily for general combining ability which indicated that the improvement of this trait involved largely additive effects, and a per cycle selection gain of about 17.9% and 22.9% was found for the US/R and RS/R populations, respectively.Specific combining ability (SeA) did not appear to be important particularly for grain weight of these two populations

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