Abstract

The article presents the results of the first backcrossing of F2 hybrids with genetic male sterility for indicators of economically valuable traits. The influence of the genotypes of our varieties was very significant. The backcrossing results were analyzed according to the length of the growing season, the yield of fiber, the length of the fiber, the mass of raw cotton in one box, micronaire and the susceptibility to wilt. Involving backcrossing hybrid combinations involving domestic cotton varieties C-6524, C-2609, Omad, An-512, An Bayavut-2, 108-F, Bukhara-6 and Indian variety specimens with a sign of genetic male sterility S-5001, S -5003, S-5007, S-5095, S-5097. The researchers set the goal of studying the effect of genotypes after the first backcrossing in F2. The best of the 35 combinations studied, the 34th combination with the participation of the Omad variety was the most precocious, in combination with fiber No. 2, 7, 24 and 28 they showed a rather high yield at the level of 34-35%., in combination with No. 7 along the fiber length, 14, 21, 23 had a fiber length of 34 mm and above.