Defense against Sclerotinia sclerotiorum in Arabidopsis is dependent on jasmonic acid, salicylic acid, and ethylene signaling

被引：115

作者：

Guo, Xiaomei ^{[1
]}

Stotz, Henrik U. ^{[1
]}

机构：

[1] Oregon State Univ, Dept Hort, Corvallis, OR 97330 USA

来源：

MOLECULAR PLANT-MICROBE INTERACTIONS | 2007年 / 20卷 / 11期

关键词：

H2O2; SAR;

D O I：

10.1094/MPMI-20-11-1384

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Genotypic differences in susceptibility of Arabidopsis thaliana to Sclerotinia sclerotiorum have not been reported due to the extreme susceptibility of this cruciferous plant. To overcome this limitation, we have established inoculation conditions that enable evaluation of differences in susceptibility to S. sclerotiorum among Arabidopsis mutants and ecotypes. Two coil mutant alleles conferred hypersusceptibility to S. sclerotiorum. The plant defensin gene PDF1.2 was no longer induced after challenging the coil-2 mutant with S. sclerotiorum. Hypersusceptibility of the coil-2 mutant to S. sclerotiorum was not correlated with oxalate sensitivity. The mutants npr1 and ein2 were also hypersusceptible to S. sclerotiorum. Induction of PDF1.2 and the pathogenesis-related gene PR1 was reduced in ein2 and npr1 mutants, respectively. Actigard, a commercial formulation of the systemic acquired resistance inducer benzothiadiazole, reduced susceptibility to S. sclerotiorum. Based on histochemical analysis of oxalate-deficient and wild-type strains of S. sclerotiorum, oxalate caused a decrease in hydrogen peroxide production but no detectable changes in plant superoxide production or gene expression.

引用

页码：1384 / 1395

页数：12

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