PJB-1998-67
INHERITANCE OF RESISTANCE IN COWPEA [VIGNA UNGUICULATA (L.) WALP.] TO BLACKEYE COWPEA MOSAIC POTYVIRUS
M. ARSHAD, M. BASHIR, AFSARI SHARIF*, AND B.A. MALIK
Abstract
In order to determine the mode of inheritance of resistance to blackeye cowpea mosaic virus in 6 cowpea lines, direct, reciprocal and back crosses were attempted between resistant and susceptible parents. The data from F1 populations suggested the dominant nature of susceptibility. The number of resistant and susceptible plants in F2 progenies of each cross segregated in a ratio of 1 resistant: 3 susceptible. The observed ratios were compared with the expected monogenic recessive model for goodness of fit using chisquare test. Based on the results obtained from F1, F 2 and back crosses, it is concluded that the resistance in the 6 cowpea lines viz., IT86F-2089-5, IT86D-880, IT90K-76, IT86D-1010, IT86F-2062-5 and BPICP3 is conditioned by a single homozygous recessive gene. The symbol for this gene is proposed as "bcm" (blackeye cowpea mosaic).
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