Combining ability estimates in F2 and F3 generations for early maturityand agronomic traits in peanut (Arachis hypogaea L.)
2001
Ali, N. | Nawaz, M.S. | Bashir, K. | Mirza, M.Y.,National Agricultural ResearchCentre, Islamabad (Pakistan)
Development of early maturing and high yielding cultivars of peanut(Arachis hypogaea L.) is a major objective of groundnut breeding programme.To select the best combining parents, three high yielding Virginia typecultivars No. 334, Banki and NC-9 were crossed with four early Spanish typelines ICGSE-4, ICGSE-130, lCGSE 147 and Chico in a factorial mating design. F2and F3 generations were evaluated in the field to determine the combiningability of the parents for maturity and other agronomic traits. Generalcombining ability (GCA) estimates were significant for all traits except maturityindex in F2 and F3 generations and seeds per 50 pods in F3. Specificcombining ability (SCA) estimates were non-significant for all the traits exceptoil contents in F2 and pod length in F3 generations. The magnitude of GCAwas much greater than SCA for all traits in both the generations indicatingthat additive genetic variance (GCA) was more important than non-additivegenetic variance (SCA). Among male parents ICGSE-147 gave highest GCA for20 pod length, seeds per 50 pods while Chico gave best GCA for maturityindex. Among adapted female parents NO. 334 gave best GCA for seeds per 50pod and maturity index while NC-9 gave best GCA for 100 seed weight.
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