Research Article 
Combining Ability Estimates for Early Maturity and Nonsenescence (Stay-green) Traits in Sorghum (Sorghum bicolor L.)
Abdul Shakoor and Afsari Qureshi
Pakistan Journal of Biological Sciences, 1999, 2(4), 1518-1526.
Abstract
Estimates of general and specific combining ability effects as well as the variances for yield, and stay-green associated components were obtained for a set of 12 straight crosses of sorghum (Sorghum bicolor L) involving three pure lines from ICRISAT and four early local type lines. The F1 and F2 generations were evaluated to determine the combining ability of the parents for maturity and stay-green traits. General combining ability estimates were non-significant for all the traits except plant height in F1. Specific combining ability estimates were significant for head length, seeds per head, 1000-grain weight, threshing percentage, plant height, LAUSL and %GLA 50DAF in F2 generation. The magnitude of GCA was much greater than SCA for majority of the traits in both F1 and F2 generations indicating that additive genetic variance was more important than nonadditive genetic variance. Among male parents, Bagdar gave highest GCA for yield per plant, head length and 1000-grain weight, whereas Pot.3-9 gave highest GCA for maturity index and threshing percentage. Among the female parents, ICSV 107, as expected for being adapted to the Pothwar tract agro-climatic conditions, gave the best GCA for yield per plant, head length, seeds per head, 1000-grain weight, threshing percentage and maturity index. ICSV 219 gave the highest GCA effects for LAUSL, %GLA 50DAF and sugar percentage among the female parents, indicating its superiority in stay-green character. Selection for early maturity and high yield in Pothwar area should be practiced among progeny of ICSV 107 X Pot.3-9, while selection for the stay-green associated characters be practiced in progeny of ICSV 219 X Pot.3-9.
ASCI-ID: 1-1163
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