PJB-2022-400
Osmolytes accumulation, oxidative defence and yield of Cucumber sativus (L.) by foliar application of methionine and phenylalanine under salinity stress
Asma marium
Abstract
Salinity is the foremost abiotic stress decreasing food production worldwide. Numerous approaches have been used to reduce the salinity toxicity. However, to enhance salt tolerance foliar application of bio stimulants is thought to be a cost-effective technology. The present study was done to reveal the effect of foliar application of amino acids on osomolytes accumulation, antioxidants, and yield of four cucumber (Cucumis sativus L.) genotypes under salinity (100 mM NaCl). The phenylalanine (0, 75, 100 mg L-1) and methionine (0, 25, 50 mg L-1) were sprayed separately and in combinations after one week of salinity stress. The cucumber genotype Valley and HC-999 were salt tolerant as compared to NSC-CM1 and Akbar. For the separate application, 50 mg L-1 methionine significantly enhanced the yield production of cucumber genotypes under saline conditions. Phenylalanine 100 mg L-1 (foliar application) showed significantly enhanced chlorophyll contents, antioxidants and osmolytes in comparison to other treatments of amino acids under salinity. However, in combination the 25 mg L-1 methionine with 100 mg L-1 phenylalanine significantly increased the osmolytes, and yield parameters in saline conditions. Overall, 25 mg L-1 methionine with 100 mg L-1 phenylalanine or 50 mg L-1 methionine can be recommended to farmers to reduce the yield loss of cucumber in salt-hit areas of the world.
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