Salt stress response in Arabidopsis thaliana plants with defective jasmonate signaling

Abstract

The effects of exogenous jasmonic acid (JA) on antioxidant enzymes in four week old leaves of wild type Arabidopsis thaliana L. (Columbia 0) and jin1 (jasmonate insensitive 1) mutant plants with defective jasmonate signaling were investigated under normal conditions and under salt stress (200 mM NaCl, 24 h). The wild type plants responded to JA by an increase in the activities of Cu/Zn superoxide dismutase, catalase, and guaiacol peroxidase, while there was no change in the case of the mutant plants. In response to the salt stress of both the wild type and mutant genotypes, the activities of superoxide dismutase, catalase, and guaiacol per oxidase were unchanged, decreased, and increased, respectively. The JA treated wild type plants showed the highest activity of all three enzymes as compared with the mutant plants. Salinity caused a decrease in chloro phyll content in the wild type and jin1 plants. Preliminary JA treatment of the Col 0 plants resulted in a normal content of photosynthetic pigments after the salt stress, while the positive JA effect was insignificant in the jin1 mutants. It was concluded that the MYC2/JIN1 protein is involved in the JA signal transduction and plant adaptation to salt stress.

Jasmonic Acid Impairs Arabidopsis Seedling Salt Stress Tolerance Through MYC2-Mediated Repression of CAT2 Expression

“…It is noteworthy that JA and the components in its signaling pathway elicit positive effects on plant salt stress tolerance in addition to their negative roles during plant response to salt stress. For example, preliminary JA application confers the 4-week-old wild-type plants increased salt stress tolerance in terms of photosynthetic pigments contents under salt stress, while such positive effect of JA was insignificant in the myc2 mutants (Yastreb et al, 2015). In addition, salt stressrepressed lateral root growth in the wild-type seedlings is enhanced in the Glucosinolate Transporter1 (GTR1) mutant, which is characterized as a transporter of a bioactive form of JA, JA-Ile (Kuo et al, 2020), demonstrating that JA signaling functions in plant root growth and development during plant response to high salinity.…”

Effect of the Application of Foliar Jasmonic Acid and Drought Stress on Grain Yield and Some Physiological and Biochemical Characteristics of Chenopodium quinoa Cultivars

“…Therefore, a decrease in protein content under drought stress is associated with a decrease in synthesis and an increase in the activity of protein-degrading enzymes (Feller 2004), which is in line with the results of this study. Application of methyl jasmonate in stress condition increased protein content and increased activity of catalase and peroxidase enzymes (Yastreb et al 2015). According to the correlation table, there was a positive and significant relationship between grain protein and biologic yield, harvest index, relative water content and chlorophyll content traits, whereas the highest correlation coefficient (r=0.501) was between grain protein and total chlorophyll content (Table 5).…”