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PJB-1995-20
HARDENING POTENTIAL IN COTTON (GOSSYPIUM HIRSUTUM L.) AT HIGH TEMPERATURE STRESS
Abstract
Leaves of cotton cultivar 5-12 were acclimated at temperatures ranging from 35 to 44°C for different lime periods followed by heat stress at 45 or 46°C. The heat acclimation potential was analyzed by Chlorophyll Fluorescence technique. The recovery of Fv / Fm ratio after application of heat stress was the paramev mler for detennination of the acclimation potential. Very small fluorescence (Fv / Fm ) values were recorded after heat stress at 46°C with fairly good response when acclimated leaves were heat stressed at 4S°C.
