THE ESTIMATION OF NEW COTTON LINES OBTAINED WITH PARTICIPATION OF INTROGRESSIVE FORM

Saida Egamberdieva

Abstract: Some of the main factors limiting the yield and output of high quality cotton fiber are: Verticillium wilt, pests and diseases, as well as stressful conditions for its cultivation, which go beyond the frames of the adaptive capabilities of the crops. Cotton is characterized by a large quantity of species, as well as the polymorphism of characteristics. Given that fact, the author explores the questions of the involvement, into the cotton breeding programme, of economically-valuable donors, by utilizing methods of remote hybridization. As a result of our many years of research, a row of the introgressive form of cotton obtained by the methods of hybridization of cultivated varieties with a wild diploid species, G.trilobum Skovsted, was created. The attraction of introgressive form into cotton breeding, has allowed the creation of new lines of upland cotton with an enriched genetic basis. The new lines are characterized with high quality fiber, resistance to Verticillium dahliae Kleb. and high yield compared to standard varieties.

Keywords: back-cross; cotton; fi ber quality; G.hirsutum L.; G.trilobum Skovsted; introgressive form; remote hybridization; resistance towards Verticillium dahliae Kleb.

Date published: 2017-09-08