54. シロイヌナズナにおけるブラシノステロイド誘導性の病害抵抗性の解析

概要

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Brassinosteroids (BRs) have the ability to protect plants from various environmental stresses, such as drought, salinity, heat stress, and pathogens. Treatment of brassinolide (BL), considered to the most important BRs, induced systemic resistance against a broad range of pathogens in tobacco and rice plant. However, the mechanisms of brassinosteroid-mediated disease resistance (BDR) was not clarified. In this study, we characterized the mechanism of BDR using Arabidopsis thaliana. BDR was effective in Arabidopsis and suppressed the growth of the virlent pathogen Pseudomonas syringae pv. tomato DC3000 (Pst). BDR was not induced in npr1 mutant, indicating that NPR1 protein, a key component of systemic acquired resistance (SAR), functions in BDR development. However, BL treatment did not induce the expression of pathogenesis-related genes (PR-1, 2, and 5), SAR marker genes, nor the accumulation of salicylic acid. Spontaneous activation of SAR and BDR exhibited additive protective effects against Pst, indicating that no cross talk exists between SAR- and BDR-signaling pathways.
植物化学調節学会の論文
2004-10-13