Abstract
Transgenic tobacco (Nicotiana tabacum L.) plants carrying a fusion between the nopaline synthase (nos) promoter and chloramphenicol acetyltransferase (CAT) reporter gene (caf) were tested for their response to treatment with H2O2. The nos promoter-driven CAT activity increased significantly by addition of H2O2, reaching the maximum level at 15 mM. Kinetic analysis for CAT activity showed that induction by H2O2 was similar to that of methyl jasmonate (MJ), but was much slower than induction by salicylic acid (SA). Time-course experiments for mRNA level also revealed that the response to H2O2 treatment was similar to that of MJ. The nos promoter displayed a rapid and transient induction of mRNA with SA treatment, with the maximum levels occurring at 3 h, whereas the levels induced by H2O2 or MJ treatment increased continuously during the 11-h experimental period. The antioxidants N-acetyl-L-cysteine and catechol did not alter the SA effect. The responses of the nos promoter to H2O2, MJ, and wounding were significantly reduced by deletions of the CAAT box region and the sequence between -112 and -101. However, these deletions did not significantly alter the SA response. This suggests that H2O2 may have a different mechanism from that of SA for inducing nos promotor activity.
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