[Induction of sesquiterpene cyclase gene expression and antioxidant enzymes regulated by exongenous salicylic acid in leaves of Capsicum annuum].

An analysis of the induction of sesquitèrpene cyclase gene expression and antioxidant enzymes in Capsicum annuum by exongenous salicyclic acid (SA) pointed out that the sesquiterpene cyclase gene expression in detached pepper leaves was induced by 0.5-4 mmol.L-1 of exongenous SA, whereas the enzyme activity and accumulation of cyclase mRNA were much lower, and it took a longer time (36 h) for the gene to be induced to express after SA treatment, comparing to other elicitors such as UV and fungi treatment. The activities of SOD and POD were enhanced, while the CAT activity was inhibited to some degree. Consequently, H2O2 content was increased in SA treated pepper leaves. H2O2 accumulation was related to the integrated influences from antioxidant enzymes.