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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).

Pulses Programme, National Agricultural Research Centre, Islamabad, Pakistan.
* Department of Biological Sciences, Quaid-e-Azam University, Islamabad, Pakistan.