Inheritance of resistance to Cotton leaf curl virus in cotton (Gossypium hirsutum L.)
Khan, A.I.,University of Agriculture, Faisalabad (Pakistan). Centre of Agricultural Biochemistry and Biology | Hussain, M.,Nuclear Inst. of Agricultural Biology, Faisalabad (Pakistan) | Rauf, S.,University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics | Khan, T.M.,University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics
Resistance to Cotton leaf curl virus (CLCuV) in three cultivars of cotton was investigated in crosses with a susceptible cultivar using generation mean analysis. No single gene of major effect controlled resistance to CLCuV in the three crosses. The mean number of effective factors controlling resistance in cross LRA-5166 x S-12 was estimated to be at least five. Estimates of broad and narrow-sense heritability indicate that the environmental effects were larger than those of genetic components. Epistasis was significant in two crosses. Additive gene effects contributed more to resistance than to the susceptibility in contrast with dominance gene effect. Reciprocal differences were detected in the cross with LRA-5166. Estimates of genetic gain ranged form low to moderate. Thus, a breeding method that makes use of additive variance should be used because much of the variances for resistance are additive, whereas dominance effects, at least in these crosses, tended to contribute to susceptibility.
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