Effects of Jasmonic acid and abscisic acid on metabolism of strawberry under NaCl stress

The aim of this research was to evaluate the effect of application of exogenous jasmonic acid (JA) and abscisic acid (ABA) at different salinity regimes, on primary and secondary metabolic changes of 'Kurdistan' and 'Queen Elisa' strawberry leaves. The reduction of adverse effects of sudden salt stress and gradual salt stress regime by increasing total phenolic content and total antioxidant capacity, has been confirmed in 'Kurdistan' and 'Queen Elisa' after application of JA and ABA. The presence of the two hormones under non-saline conditions significantly increased total soluble protein content but less than 10 mM L-1 of sudden salt stress adverse effects were noticed. Abscisic acid and JA caused a clear increase in total soluble proteins of 'Kurdistan' leaves at both gradual salt stress and non-saline conditions. The role of JA and ABA in aspartic acid increment at gradual salt regime was notable. Salt stress induced tyrosine increase and both hormones enhanced asparagine, alanine, histidine, and GABA contents, respectively. The study reveals that JA and ABA are important plant stress hormones and application of ABA accompanied by different JA concentrations activated the protective mechanism of the strawberry plant against NaCl stress.