Genetics of Resistance to Cotton Leaf Curl Disease in Gossypium hirsutum L. under Field Conditions

Abstract

One hundred and forty two cotton germplasm lines were screened for cotton leaf curl virus symptoms in field evaluations during 2003, 2004, and 2005. Fifty cross combinations involving 30 of these lines classified resistant or susceptible were used for inheritance study of the disease. All the F(1) plants of crosses involving resistant x resistant, resistant x susceptible, and susceptible x resistant parents were resistant, indicating dominant expression of the disease resistance and there were no maternal or cytoplasmic effects detected from reciprocal hybridization. In 22 crosses, 4 types of segregation patterns were obtained in the F(2) generations. A good fit for 15 (resistant):1 (susceptible), 13 (resistant):3 (susceptible), 9 (resistant):7 (susceptible) ratios indicated digenic control of the trait with duplicate dominant, dominant inhibitory, and duplicate recessive epistasis, respectively. Three-gene control with triplicate dominant epistasis was obtained in one of the crosses. This segregation pattern, however, needs further confirmation due to smaller population size. The absence of complementary gene action was obtained in 1 susceptible x susceptible and 27 resistant x resistant crosses as their F(1)s were susceptible and resistant, respectively, and F(2) generation lacked segregation.

Three variants of cotton leaf curl begomoviruses with their satellite molecules are associated with cotton leaf curl disease aggravation in New Delhi

“…CLCuD-begomovirus species, Cotton leaf curl Multan (CLCuMuV), Cotton leaf curl Kokhran (CLCuKoV) and Cotton leaf curl Alabad virus (CLCuAlV) have been identified in India (Ahuja et al 2007;Rajagopalan et al 2012, Kumar et al 2010. Cotton leaf curl Rajasthan virus and Cotton leaf curl Burewala virus have been identified as predominat viruses in cotton growing areas of NW India; but according to guidelines proposed by Brown et al (2015), these two viruses have been considerd as strains and designated as CLCuMuVRajasthan and CLCuKoV-Burewala, respectively.…”

Dominance of resistance-breaking cotton leaf curl Burewala virus (CLCuBuV) in northwestern India

“…In northwestern India, the begomoviruses associated with CLCuD are cotton leaf curl Rajasthan virus (CLCuRV), cotton leaf curl Multan virus (CLCuMuV) and cotton leaf curl Kokhran virus (CLCuKoV) [1]. Apart from these viruses, a spurious infection with tomato leaf curl New Delhi virus (ToLCNDV) and tomato leaf curl Bangalore virus-cotton (ToLCBV) has also been reported in cotton [32].…”

Cross compatibility of cultivars of Gossypium hirsutum L. and feral Gossypium barbadense L. in the Southern Highlands of Tanzania

“…The crosses were done in a bidirectional manner; cultivar and feral Brubaker et al (1999), Ahuja et al (2007) and Konan et al (2007). Emasculation was done a day before pollination between 16:00 and 18:00 hours and before the anthers dehisced.…”