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High salinity causes ionic, osmotic, and oxidative stresses to plants, and the antioxidant enzyme Catalase2 (CAT2) plays a vital role in this process, while how  CAT2  expression is regulated during plant response to high salinity remains elusive. Here, we report that phytohormone jasmonic acid (JA) impairs plant salt stress tolerance by repressing  CAT2  expression in an MYC2-dependent manner. Exogenous JA application decreased plant salt stress tolerance while the  jar1  mutant with reduced bioactive JA-Ile accumulation showed enhanced salt stress tolerance. JA enhanced salt-induced hydrogen peroxide (H 2 O 2 ) accumulation, while treatment with H 2 O 2 -scavenger glutathione compromised such effects of JA on plant H 2 O 2  accumulation and salt stress tolerance. In addition, JA repressed  CAT2  expression in salt-stressed wild-type plant but not in  myc2 , a mutant of the master transcriptional factor MYC2 in JA signaling, therefore, the  myc2  mutant exhibited increased salt stress tolerance. Further study showed that mutation of  CAT2  largely reverted lower reactive oxygen species (ROS) accumulation, higher CAT activity, and enhanced salt stress tolerance of the  myc2  mutant in  myc2 cat2-1  double mutant, revealing that  CAT2  functions downstream JA-MYC2 module in plant response to high salinity. Together, our study reveals that JA impairs Arabidopsis seedling salt stress tolerance through MYC2-mediated repression of  CAT2  expression.

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