Abstract
Pretransplant treatment and environmental factors after transplanting affect plant establishment and yield in vegetable crops. Six-week-old tomato (Solanum lycopersicum L., cv. M-19) and pepper (Capsicum annuum L., cv. M-71) transplants were subjected to 38°C for 20 h as heat pretreatment (HP) and recovered at 25°C for 2 h before being subjected to heat stress of 30°C for 1, 2, 3, 4, and 6 days, along with control non-heat-treated plants. The HP increased membrane integrity, lowered electrolyte leakage, and chlorophyll degradation; increased proline and carbohydrates; shortened time to first flower formation; and increased fruit set. High-temperature conditioning could be used as a hardening method for tomato and pepper transplants.
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