Salicylic acid promotes seed germination under high salinity by modulating antioxidant activity in Arabidopsis

摘要: • Findings regarding the role of salicylic acid (SA) in seed germination are somewhat variable, depending on plant genotypes and experimental conditions used, thus molecular mechanisms underlying SA regulation still unclear. Here, we report that physiological concentrations promote under high salinity by modulating antioxidant activity Arabidopsis. Germination induction deficient 2 (sid2) seeds was hypersensitive to salinity. While inhibitory effect exaggerated presence higher (> 100 μM), it significantly reduced lower (< 50 μM). Under salinity, endogenous contents H(2) O(2) were elevated wild-type sid2 but original after treatment with 1 μM SA. NahG transgenic plants influenced a lesser degree (NahG is bacterial gene encoding salicylate hydroxylase converts catechol). We found catechol, an degradation product accumulated plants, acts as compromises effects Our observations indicate that, although not essential for normal growth conditions, plays promotive reducing oxidative damage.