Evaluation of physiological responses of peanut to different irrigation regimes and foliar application of Salicylic acid

In order to evaluate of grain yield, anti-oxidante enzymes activitie and osmolytes accumulation in leaves of peanut as affected by different irrigation levels and Salicylic acid, the present study was done. This experiment carried out as split plat based on randomized complete block design with three replications in experimental field of Agicutural and Natural Resources Research and Education Center of Guilan Province, Astara, Iran, during 2018 and 2019 years. Four level of irrigation regimes including no irrigation (as control), irrigation at initial flowering stage, irrigation at pod formation stage and irrigation at initial flowering + pod formation stages and three levels of salicylic acid such as 100, 200 and 300 µmol/l comprised experimental treatments, as main and sub plot, respectively. Deficit irrigation decreased grain yield, chlorophyll index (SPAD) and leaf relative water content in peanut. Prolne, catalaz, superoxide dismutase, peroxidase, soluble sugar content, soluble protein content and leaf anthocyanin content enhanced in responses to deficit irrigation. In addition, foliar application of salicylic acid caused to improve all measured traits in peanut at different irrigation levels. The greatest grain yield of peanut (3450 kg/ha) was obtained in response to supplementary irrigation at both initial flowering stage + pod formation stage along with salicylic application at the rate of 300 µmol/l. Based on results of this study, supplementary irrigation and foliar application of salicylic acid could be recommendable in direction to increase plant resistance to drought stress and grain yield improvement in peanut .