Effects of Abscisic Acid on Physiological Responses, Growth, Yield, and Quality of Peanut Seed under Water Deficit in Field Trial Conditions
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Abstract
The effect of abscisic acid (ABA) on physiological responses, growth, yield components, yield, and quality of peanut seed under water deficit in field trial conditions was evaluated. Seeds of peanut cv. DOA Khon Kaen 5 seeds were treated with foliar ABA at the rate of 0 10 20 and 30 ppm during pod initiation stage (R3 growth stage) in water-deprived plants compared to unapplied in water-deprived plants and well-watered plants. The results showed that photosynthetic rate, transpiration rate, and H2O conductance under water deficit were less than those under well-watered. However, photosynthesis water use efficiency and vapor pressure deficit based on leaf temperature per air temperature increased more than those under well-watered. Foliar application of ABA at 10 ppm during pod initiation stage increased pod fresh weight and pod dry weight of peanut under water deficit. Moreover, seed moisture, germination, and vigor of peanut seeds tested by accelerated aging test under water deficit was not significantly different from under well-watered, according to the Department of Agriculture's registered peanut seed standards (standard germination ≥ 75%)
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