USE NUMBER OF LEAVES AS A PHOTOSYNTHETIC TEST-SIGNS IN THE SELECTION OF NEW HIGH-PRODUCTIVE GENOTYPES OF MEDIUM FIBER COTTON

Abstract

The article presents the results of studies of introgressive hybrids of medium fiber cotton and their parental forms in the period 2018-2019. It was established that the use of the number of leaves as a test-sign in the breeding process helps to create new donors with an increased complex of economically valuable traits. The number of leaves of the studied hybrids of medium fiber cotton during the ontogenesis was in a wide range from 51,2 to 122,7 units/plant. A significant number of them (79,7-122,7 pcs./plant) varied in the phase of mass fruiting. In this case, the crop of raw cotton in combinations is 69,2-110,2 g/plant. The highest yielding (100,4-110,2 g/plant) were out 9 hybrid combinations – NAK BC 14/2 x Ziroatkor-64, Nazilli-84-S x Dehkon, NAK-99/1 x Dehkon, Cocer-4104 x Sorbon, DP-5816 x Dehkon, NAK BC 14/2 x Dusti-IZ, Nazilli-84 (92-13) x Ziroatkor-64, NAD-53 x Sorbon and DAK-66/3 x Dehkon significantly deviating – by 43,5-67,9 g/plant relative to the average of the two parental forms. A correlation between the number of leaves per plant and the harvest of raw cotton was revealed. Consequently, a high interconnection of characters was noted in the phase of mass fruiting, where the number of leaves per plant increases