Vol. 10, Issue 10 (2021)

Author(s):
Venkatesh and ST Kajjidoni

Abstract:
An experiment was carried using 204 upland cotton (Gossypium hirsutum L,) diverse genotypes for heat tolerance during summer 2016-17 to study character association by correlation analysis among plant morpho-physiological traits. The results showed that increased canopy temperature due to heat stress can significantly affect plant growth and development, including chlorophyll content as well as leaf area even when the crop was cultivated under irrigated conditions. Since, the cotton cultivars with cooler canopies have higher heat tolerance and as canopy temperature reflects genotype fitness in a stressful environment, it can be used as an indirect selection criterion for genetic improvement of high temperature tolerance in the cultivars.