New genetic variability in cotton

摘要

Creation of genetic variability plays a crucial role in the development of varieties. Out of various methods induced, mutations are the potential source of creating genetic variability in cotton. The present study was carried out to find out the effects of mutagens (proper dose) on pollen fertility, stomata size, boll size and leaf size of two varieties of cotton cv. HS-6 and HD-107 and these were given combined mutagenic treatment of 10 KR+0.25 per cent EMS and 20 KR+0.25 per cent EMS and M_3 was raised. Selection was made from M_2 generation for pollen fertility, stomata size, boll size, earliness and resistance to cotton leaf curl virus (CLCuV). M_3 was raised from M_2 generation alongwith control. In M_3, the mutant of HD 107 was found to have bigger stomata, higher boll weight and earliness as compared to control. Mutant of HS 6 was more resistant to cotton leaf curl virus (CLCuV) as compared to control.