Genetics and Combining Ability of Leaf Curl Virus Resistance in Cotton (Gossypium hirsutum L.)
Oct 8, 2018
The cotton leaf curl virus (CLCV) disease caused by Gemini viruses has resulted in failure of the cotton crop in many countries. The losses caused by this disease range from 20 to 80 percent depending upon the stage of viral infection by virulent cotton white fly (Bemisia tabaci). The only permanent approach of combating this menace is through resistant varieties and hybrids. An understanding of the genetics and combining ability of CLCV resistance is a pre-requisite for breeding cultivars resistant to this disease. The present investigation was undertaken for that purpose. The experimental material consisted of 90 crosses involving resistant and susceptible parents and segregating generations. The experiments were conducted at Punjab Agricultural University, Ludhiana under artificial conditions and at the Cotton Research Station, Abohar, under disease epiphytotic conditions. The CLCV resistance was controlled by more than two genes along with inter-allelic interactions. Good general combining parents included LH 1134, IL 85, IL 89 and IL 99 as females and F 54 as male parent for virus resistance. PIL 43 x PIL 8 (LHH 144), LH 1832 x F 54, LH 1818 x F 54, and LH 1556 x R 27 were good specific combining crosses for CLCV resistance. The resistant crosses involved either one or both resistant/tolerant parents. The breeding approaches for CLCV resistance are discussed.