GASPRO International Journal of Eminent Scholars

ABSTRACT
The article presents the results of the first backcrossing of F2 hybrids with genetic male sterility
(GMS) 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. The most large-boxed plants were
hybrid combinations under No. 7, 8, 15, 21, 22 and 29, in which this indicator was higher than 6
g. By micronaire in our studies, 4 and 33 combinations turned out to be such hybrids.
KEYWORDS: Genetic male sterility, pollen fertility, pollen sterility, variety, hybrid
combination, backcross, box size, verticilliosis wilt, micronaire, fiber
length, growing season, cotton