GENOTYPIC DIFFERENCE IN RESPONSE TO HEAT SHOCK TREATMENT IN SOME TOMATO CULTIVARS GROWN UNDER COLD STRESS
Abstract
Soaked seeds of four tomato genotypes were subjected to three pretreatments; i.e. cooling (3±2°C for 180 min), heating (45±2°C for 90 min) and control (22-25°C) and then planted in peat-moss individually and incubated in greenhouse till germination and growing up to 32 days old. Seedlings were then grown at 7±2°C in growth chamber. Our results indicated that utilizing of heating pretreatment led to enhancing morphological parameters under stress condition especially in Carmen (CAR) and Typhoon (TY) while the opposite was in CAR under non-stress conditions. In the field stage, heating increased fruit weight and fruit number in CAR followed by AG and TY. Therefore, the results indicated that CAR and AG are the most tolerant cultivars for low temperature induced by shock heating pretreatment. The high expression of APX and P5cs refer to more tolerance for cold stress and high productivity.
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