Potential impacts of amino acids, putrescine and glycine betaine on productivity and fruit attributes of “Le-Conte” pear trees grown under water scarcity stress

: The problem of water shortage worries many countries in the world because its negative impact on many economic crops. In this study, the foliar application by amino acids 3 cm/l, putrescine 1.03 g/l , glycine betaine 1.35 g/l, betaine 0.45 g/l and proline 1.28 g/l. added to reduce stress These compounds were sprayed twice, the first spraying one month after fruit set, the second spraying two months after fruit set on "Le-Conte" pear trees that grow under conditions of water scarcity stress (60% of water requirements) and control (60% of water requirements) with any these compounds treatments. Water scarcity stress caused a reduction in vegetative parameters, macro nutrients, soluble proteins, lowest productivity per tree and fruit weight, fruit valium, fruit length and fruit width, TSS, and fruit attribute. However, the contents of proline, full phenol, and antioxidant enzyme activity were augmented in pear trees grown under water scarcity stress. application of amino acids, putrescine, and glycine betaine on stressed trees showed different responses and improvements in the yield, fruit attribute, morphological traits, macronutrients, reduction of oxidative stress and antioxidant enzyme activity. a Foliar spray amino acids 3 cm/L on "Le-Conte" pear trees grow under conditions of water scarcity stress (60% CWR) during after fruit set stage to harvest gave the greatest yield per tree, fruit weight, fruit valium, fruit length, fruit diameter, TSS and vegetative growing compared to control (60% CWR) in two seasons. It could be recommended that foliar spray of amino acids, putrescine and glycine betaine, especially amino acids, could be commercially intended for the stimulation of pear trees cultivated under water scarcity stress