The morphophysiological responses of Physalis alkekengi to foliar applications of amino acids under drought stress conditions

These experiments were performed in a three replicated-split plot factorial arranged in CRBD with three drought stress levels ((I0) (no-stress) I1 (moderate stress) I2 (severe stress)) in the main plots and foliar application of different amino acids (Tyrosin, Argenin, Tryptophan, Glycine and without foliar application as control treatments) in subplots. This study was carried out in the research field of the Iranian institute of medical plant, Karaj, Iran during 2017-2018. This study stimulated plant height, number of fruit, total dry matter, SPAD, chlorophyll a(CHLa), chlorophyll b (CHLb), total chlorophyll (CHLt), and caretonied. The results indicated that drought stress had significantly affect (p ≤ 0.01) on all traits except SPAP, and also foliar application of amino acids was significant in all traits. Interaction effects CHLb, CHLt, and caretonied was significant. The highest amount of plant height, number of fruits, fruit dry weight, total dry matter, and SPAD obtained from control (no drought stress) and the highest amount of CHLa, CHLb, and CHLt, shown in moderate stress and finally, Severe drought had the Lowest amount of all treatments. Besides, the most number of fruit, fruit dry matter, and CHLA, CHLB, CHLT was in the foliar application of Arginine and plant height and carotenoids and total dry matter and SPAD were in glycerin and Tyrosin respectively. Fruit dry matter is the main index of assessment and increased by argenin application by 39.8 percent than control. Furthermore, nonfoliar application(control) had the lowest amount in all traits. in general, Biostimulants application improved the vegetative and morphophysiological characteristics and caused a reduction in chemical fertilizer consumption and sustainable agriculture progress.