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首页> 外文期刊>Molecular Plant-Microbe Interactions >The Arabidopsis thaliana JASMONATE INSENSITIVE 1 Gene Is Required for Suppression of Salicylic Acid-Dependent Defenses During Infection by Pseudomonas syringae
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The Arabidopsis thaliana JASMONATE INSENSITIVE 1 Gene Is Required for Suppression of Salicylic Acid-Dependent Defenses During Infection by Pseudomonas syringae

机译：Arabidopsis Thaliana jasmonate不敏感1基因是在Pseudomonas inringae感染期间抑制水杨酸依赖性防御所必需的

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Many plant pathogens suppress antimicrobial defenses using virulence factors that modulate endogenous host defenses. The Pseudomonas syringae phytotoxin coronatine (COR) is believed to promote virulence by acting as a jasmonate analog, because COR-insensitive 1 (coi1) Arabidopsis thaliana and tomato mutants are impaired in jasmonate signaling and exhibit reduced susceptibility to P. syringae. To further investigate the role of jasmonate signaling in disease development, we analyzed several jasmonate-insensitive A. thaliana mutants for susceptibility to P. syringae pv. tomato strain DC3000 and sensitivity to COR. Jasmonate-insensitive1 (jin1) mutants exhibit both reduced susceptibility to P. syringae pv. tomato DC3000 and reduced sensitivity to COR, whereas jasmonate-resistant 1 (jar1) plants exhibit wild-type responses to both COR and P. syringae pv. tomato DC3000. A jin1 jar1 double mutant does not exhibit enhanced jasmonate insensitivity, suggesting that JIN1 functions downstream of jasmonic acid-amino acid conjugates synthesized by JAR1. Reduced disease susceptibility in jin1 mutants is correlated with elevated expression of pathogenesis-related 1(PR-1) and is dependent on accumulation of salicylic acid (SA). We also show that JIN1 is required for normal P. syringae pv. tomato DC3000 symptom development through an SA-independent mechanism. Thus,P. syringae pv. tomatoDC3000 appears to utilize COR to manipulate JIN1-dependent jasmonate signaling both to suppress SA-mediated defenses and to promote symptom development.
机译：许多植物病原体使用调节内源性宿主防御的毒力因子来抑制抗微生物防御。据信假鼠霉素植物毒素（Cor）促进毒力通过作为茉满面的类似物，因为在茉莉酸盐信号传导中损害了Cor-InviTeve（Coi1）拟南芥和番茄突变体，并且表现出对P. inringae的降低易感性。为了进一步探讨茉莉酸酯信号传导在疾病发展中的作用，我们分析了几种jasmonate不敏感的A.拟南芥突变体，易于对p. inringae pv。番茄菌株DC3000和对COR的敏感性。 jasMonate-Insensitive1（Jin1）突变体表现出对P.Syringae PV的易感性降低。番茄DC3000和对COR的敏感性降低，而含贾酸盐1（JAR1）植物对Cor和P.Syringae PV的野生型反应表现出野生型反应。番茄DC3000。 Jin1 JAR1双突变体未表现出增强的茉莉酸盐不敏感性，这表明Jin1在JAS1合成的茉莉酸 - 氨基酸缀合物下游的功能。 Jin1突变体中的疾病易感性降低与发病性相关1（PR-1）的升高表达相关，并取决于水杨酸（SA）的积累。我们还表明，正常的P.Syringae PV需要Jin1。番茄DC3000通过SA独立机制症状发展。因此，p。 Syringae pv。 Tomatodc3000似乎利用核来操纵Jin1依赖性的jasmonate信号，以抑制Sa介导的防御和促进症状发展。

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