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

Abstract

Khan A. I., Hussain M., Rauf S., Khan T. M. (2007): Inheritance of resistance to Cotton leaf curl virus in cotton (Gossypium hirsutum L.). Plant Protect. Sci., 43: 5-9.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.

Allelopathic Effect of Jatropha (Jatropha curcas) on Chilli (Capsicum annum) and Green Gram (Vigna radiata)

“…Moreover, this inhibitory effect was recorded only at early growth stage (50 DAS) of chilli. Khan et al, (2008), observed similar results; they recorded significant reductions in shoot and root fresh and dry weights of receiver plant by aqueous extract of donor species.…”

Biotechnological Advancements and Begomovirus Management in Okra (Abelmoschus esculentus L.): Status and Perspectives

“…Since various begomovirus infecting cotton such as CLCuBaV, CLCuMuV, CLCuVBur3, and CLCGV were found infecting okra too, therefore, we have also analyzed the genetics of begomoviruses infecting cotton, which belong to the same Malvaceae family. A range of genetic control like two dominant and a supplementary gene (Wilson and Brown, 1991 ) for Cotton cultivar Cedix to cotton leaf crumple virus (CLCrV); presence of at least five factors (Khan et al, 2007 ) for Cotton leaf curl virus (CLCuV); and involvement of three genes, two for resistance and one imparting suppression of the resistance (Rahman et al, 2005 ) for CLCuD have been observed. Further, Ahuja et al ( 2007 ) reported duplicate dominant, dominant inhibitory, duplicate recessive epistasis and triplicate dominant epistasis for CLCuD, in 22 cross combinations.…”

Role of QTL mapping to circumscribe various diseases in different crops with special emphasis on cotton.

“…CLCuD is caused by genus Begomovirus, Family Geminiviridae and is mostly spread via whitefly Bemisia tabaci. Geminiviruses cause this disease in organization with Betasatellites (specific symptom modulating satellites) and alphasatellites (molecule of evolutionarily distinctive group of satellites) [30][31][32]. During last 20 years CLCuD is the mainly disturbing natural debacle that causes massive sufferers to cotton crop production in the world including Pakistan.…”