DIRECTED APPLICATION OF MUTANT FORMS IN PRACTICAL COTTON BREEDING

Abstract

Characters of genetic changes in cotton seeds as influenced by chemical mutagens separately and together with the chemical compound с-ABA (с-amino-benzoic acid) were investigated in various medium-staple cotton varieties. The improvement of the process of getting high genetic variability by mutant factors was studied. In the course of long-term work were obtained mutant lines being at the different stages of the breeding process. The one hundred and twenty three new promising cotton varieties have been developed, 35 new mutant varieties have been turned over to the competitive variety trial. The cotton varieties of mutant origin as to the growing period ripen 1-7 earlier as compared with the standard cultivar AzNIKhI-195. All the varieties studied exceed the standard cultivar in productivity by 10-27%. The promising varieties Ganja-191, Ganja-192, Ganja-168, Ganja-62, Ganja-135, and Ganja-146 are distinguished by higher yielding capacity and staple output as compared with the standard. The varieties Ganja-72, Ganja-83, Ganja-131, and Ganja-135 as to staple quality meet the requirements of the IV staple type. The new cotton varieties Ganja-2, Ganja-110, and Ganja-114 have been recognized; Ganja-132, Ganja-160, and Ganja-182 are at the plots of the State Commission on Trial and Protection of Breeding Achievements.