55. 環境ストレスが植物の全身獲得抵抗性誘導に与える影響の解析

概要

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Systemic acquired resistance (SAR) is one of plant defense systems, accompanying salicylic acid (SA) accumulation and SAR marker gene expression. To investigate the influences of environmental stress on SAR induction, we analyzed effects of abscisic acid (ABA) on SAR. In this study, we used 1, 2-benzisothiazole-3(2H)-one 1, 1-dioxide (BIT) and benzo(1, 2, 3)thiadiazole-7-carbothioic acid S-methyl ester (BTH) for SAR induction. BIT and BTH activate upstream and downstream of SA in SAR signaling pathway, respectively. ABA treatment suppressed BIT-induced PR gene expression and SA accumulation, indicating that ABA suppressed the induction of SAR by BIT. ABA treatment also suppressed BTH-induced SAR in Arabidopsis. The environmental stress such as salinity suppressed the induction of SAR. Furthermore, the expression of some of ABA-biosynthesis or ABA-responsive genes were down-regulated by treatment with BIT or BTH. These data suggest that there should be some crosstalks between the ABA mediated signaling and SAR signaling.
植物化学調節学会の論文
2004-10-13