CHANGES IN PHYSIOLOGICAL PARAMETERS IN COLORED-FIBER COTTON ACCESSIONS AND THEIR ANALYSIS

Abstract

This study examined physiological traits of cotton (Gossypium hirsutum L.) accessions that differ in fiber color. The material comprised the brown-fibered accession A-1025 and the white-fibered Gulshan, both from the collection of the Institute of Genetics and Plant Experimental Biology (Academy of Sciences of the Republic of Uzbekistan), and the green-fibered accession 010764 from the collection of the Institute of Cotton Breeding, Seed Production and Cultivation Agrotechnologies (Ministry of Agriculture of the Republic of Uzbekistan). Total leaf water content was measured at the flowering–boll formation stage under optimal water supply, simulated drought and salinity. Under optimal supply it was 75.8% in 010764 and Gulshan and 71.9% in A-1025. Drought lowered it by 6.1, 7.0 and 1.9 percentage points in 010764, Gulshan and A-1025, respectively, and salinity by 5.7, 5.6 and 0.8 points, so A-1025 changed least under both stresses. Correlations among morphophysiological and economically important traits were also calculated, and the fuzz type and fiber color of three F₁ combinations involving 010764 were described.