Breeding for Dual Purpose Cowpea (Vigna unguiculata (L.) Walp)
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Date
2015-07
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University of Agricultural Science, Dharwad
Abstract
A study was conducted to estimate combining ability for fifteen traits in cowpea through diallel analysis involving eight parents. The twenty eight F1’s along with eight parents were grown in randomized block design with two replications at IGFRI, Dharwad during kharif 2014. Based on performance of F1 progenies in terms of combining abilities for grain and green fodder yield, the F2 populations of two crosses (MFC-09-12 x BL-2 and UPC-622 x EC-4216) were advanced to next generation to identify superior segregants and estimate the genetic variability.
Analysis of variance for combining ability effects revealed that significant differences for plant height, secondary branches per plant, leaf to stem ratio, days to first flowering, days to fifty per cent flowering, days to maturity, pods per plant, seed yield per plant, green fodder yield per meter row length, dry matter content, stover yield per plant and crude protein content except primary branches per plant, seeds per pod, pod length and test weight indicating the presence of considerable genetic variability for most of the characters investigated.
The parents MFC-09-12, UPC-8705 and UPC-9202 exhibited desirable significant gca effects for most of the traits under study whereas the crosses SWAD x UPC-9202, SWAD x UPC-622, SWAD x UPC-5286 and MFC-09-12 x UPC-8705 registered significant sca values in desired direction for all the characters under study.
Among F2 populations the frequency of desirable segregants isolated was highest for stover yield per plant in F2 population of MFC-09-12 x BL-2 and days to maturity in F2 population of UPC-622 x EC-4216.
The estimates of PCV, GCV, heritability and GAM in two F2 segregating populations indicated high PCV, GCV, heritability and GAM was recorded for most of the traits except pod length, number of seeds per pod, test weight, dry matter content and crude protein content.
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