101 シロイヌナズナ変異株を用いたブラシノステロイド誘導性病害抵抗性の解析

概要

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Steroid hormone-mediated disease resistance (SDR) is mediated by brassinosteroids (BRs) and effective against a broad range of pathogens in tobacco. The induction mechanism of SDR was investigated in Arabidopsis. The treatment of brassinolide (BL), the most active BR, induced resistance against Pseudomonas syringae pv. tomato DC3000,but did not induce the expression of pathogenesis-related genes (PR-1,2,and5) and the accumulation of salicylic acid (SA). Pathogenic infection studies using NahG transgenic plant indicated that SA is not required for SDR development. BL treatment did not induce SDR in npr 1-1 mutant. These indicate that SDR is distinct from systemic acquired resistance (SAR). SDR and SAR exhibited the additive protective effect against Pst. Although it is reported that BL induces the expression of jasmonic acid (JA) biosynthetic genes, SDR was induced in a JA-insensitive mutant jar 1-1. This indicates that SDR is different from induced systemic resistance (ISR) mediated by non-pathogenic rizobacteria. Our data suggest that SDR is a novel type of resistance distinct from SAR and ISR.
植物化学調節学会の論文
2002-10-31