Plant Protect. Sci., 2007, 43(1):5-9 | DOI: 10.17221/2347-PPS

Inheritance of resistance to Cotton leaf curl virus in cotton (Gossypium hirsutum L.)

Azeem Iqbal Khan¹, Manzoor Hussain³, Saeed Rauf², Tariq Manzoor Khan²

¹ Centre of Agriculture Biochemistry and Biology,

² Department of Plant Breeding &

Genetics, University of Agriculture, Faisalabad, Pakistan

³ Nuclear Institute of Agriculture Biology, Faisalabad, Pakistan$2

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 Cotton leaf curl virus in the three crosses. The mean number of effective factors controlling resistance in cross LRA-5166 × S-12 was estimated to be at least five. Estimates of broad and narrow sense heritability indicate that effects by the environment were larger than those of genetic components. Epistasis was significant in two crosses. Additive gene effects contributed more to resistance than to 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.

Keywords: Cotton leaf curl virus; Gossypium hirsutum; heritability of resistance; generation mean analysis

Published: March 31, 2007  Show citation