Physiological response of rice plant to foliar application of methyl jasmonate under salinity stress conditions in vegetative stage

Jasmonic acid and its methyl ester, methyl jasmonate, are plant growth regulators that affect many physiological and biochemical processes in plants. On the other hand, salinity stress is one of the limiting factors of plant growth. Therefore, in order to investigate the effect of methyl jasmonate foliar application and salinity stress on physiological characteristics of rice plant (Tarom local cultivar) in the vegetative stage, a factorial experiment was conducted in a completely randomized design with three replications in greenhouse conditions. The results showed that the traits of nitrogen, phosphorus, potassium, iron, zinc, copper and manganese of the root as well as total chlorophyll and glycine-betaine were affected by the interaction of salinity stress and methyl jasmonate foliar application. Mean comparison showed that the highest amount of elements in the roots of rice plants was related to salinity stress treatment and methyl jasmonate foliar application. In contrast, the lowest amount of elements in the roots of rice plants was related to salinity stress treatment of ۱۰ dS/m and no use of methyl jasmonate. With increasing salinity stress, the amount of glycine-betaine was increased and the highest amount was in the treatment of methyl jasmonate foliar application and salinity stress of ۱۰ dS/m at ۱.۳۶ μmol. Total chlorophyll content was also highest in methyl jasmonate foliar application and no salinity stress at ۱۲.۲۱ μmol/g fresh weight. The results of principal component analysis showed that the first and second components accounted for ۹۹% of the total variance. Based on the biplot results, it was observed that methyl jasmonate foliar application + salinity stress of ۱۰ dS/m was highly correlated with glycine-betaine.

کلیدواژه ها:

Chlorophyll ، salinity stress ، iron ، glycine betaine