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HEAT TOLERANCE IS VARIABLE IN COTTON (GOSSYPIUM HIRSUTUM L.) AND CAN BE EXPLOITED FOR BREEDING OF BETTER YIELDING CULTIVARS UNDER HIGH TEMPERATURE REGIMES
Abstract
Fifty accessions of Gossypium hirsutum L., were evaluated for heat tolerance based on relative cell injury level (RCIL %) and stomatal conductance. Accessions showed highly significant differences for both the parameters and ranged in relative cell injury level between 44.8 to 74.9% and from 58.1 µms-1 to 120.6 µms-1 in stomatal conductance. The breeding material (NIAB 111/2 followed by MNH 553) showing the least mean Relative cell injury level also showed the highest stomatal conductance and both these traits showed negative correlation (r= -0.70). The data on the basis of both the above mentioned criteria were used to sort out heat tolerant and sensitive cotton accessions for further breeding program.
