STUDY OF COTYLODED LEAVES AS A TEST TRAIT IN SELECTION OF NEW HIGHLY PRODUCTIVE GENOTYPES OF MEDIUM FIBER COTTON IN THE CONDITIONS OF THE GISSAR VALLEY

Abstract

The results of the study of various genotypes of medium fiber cotton are presented in order to create new highly productive varieties. It has been shown that evaluation and selection by the size of a large cotyledon leaf can significantly increase the accuracy and resolution of the identification of highly productive genotypes by phenotypic test traits. It was revealed that the maximum value of the total surface of cotyledon leaves has a positive effect on the yield of cotton plants. According to the data obtained, in the genotypes of medium staple cotton used by us in the experiments, on average for 2013-2018. the area of the large cotyledon leaf (BSL) exceeded the area of the smaller cotyledon leaf (MSL) in size. So, among the studied genotypes, the following combinations stood out: ALC-86/6 x Sorbon, DP-5816 x Dusti-IZ, NAD-53 x Dusti-IZ, NAK-99/1 x Dekhkon, DAK-66/3 x Dekhkon, NAK BC 14/2 x Dusty-IZ, which are offered for further breeding research to develop new high-yielding varieties and hybrids that are adapted and resistant to experimental environmental factors.