Abstract
Salicylic acid (SA) and jasmonic acid (JA) are essential compounds in the pathogen- and wound-signaling path ways accompanying induced expression of acidic and basic pathogenesis-related (PR) protein genes, respectively. How ever, on the effect of exogenously supplied SA and JA in in duction of PR gene expression, conflicting results have been obtained using various plant materials at different de velopmental stages. There is no clear evidence on these effects in the presence of both signals at the same time. We analyzed the effect of SA on wound- and JA-induced basic PR gene expression and that of JA on SA-induced acidic PR gene expression in mature tobacco leaves. Wound-in duced accumulation of transcripts for all 4 basic PR genes tested was enhanced in the presence of MeJA, and in hibited in the presence of SA. On the other hand, expres sion of all 3 acidic PR genes tested was induced by SA and was inhibited by MeJA. Using antibodies raised against acidic PR-l and PR-2 proteins, these effects were confirm ed at the protein level. These results indicated that JA works as an inducer of basic PR genes, and also as an inhib itor for acidic PR genes, while SA does the opposite.
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