CRYPTOCHROME 1 Is Implicated in Promoting R Protein-Mediated Plant Resistance to Pseudomonas syringae in Arabiclopsis

作     者：Liang Wu Hong-Quan Yang 

作者机构：National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academyof Sciences and Graduate School of Chinese Academy of Sciences 300 Fenglin Road Shanghai 200032 China School of Agriculture and Biology Shanghai Jiaotong University 800 Dongchuan Road Shanghai 200240 China 

出 版 物：《Molecular Plant》 (分子植物（英文版）)

年 卷 期：2010年第3卷第3期

页      面：539-548页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 09[农学] 0904[农学-植物保护] 090401[农学-植物病理学] 

基　　金：国家自然科学基金 上海市重点学科建设项目 

主　　题：Arabidopsis cryptochrome plant resistance salicylic acid pathogenesis-related (PR) gene. 

摘      要：Plants have evolved complex mechanisms to defend themselves against pathogens. It has been shown that several defense responses are influenced by light, and the red/far-red light photoreceptor phytochromes （PHY） modulate plant defense responses in Arabidopsis. Blue light receptor cryptochromes （CRY） work together with PHY to regulate many light-controlled responses, including photomorphogenesis, floral induction, and entrainment of the circadian clock. We report here that the Arabidopsis blue light photoreceptor CRY1 positively regulates inducible resistance to Pseudomonas syringae under continuous light conditions. By challenging plants with R syringae pv. tomato （Pst.） DC3000 carrying avrRpt2, we demonstrate that effector-triggered local resistance is down-regulated in the cry1 mutant, leading to more pathogen multiplication. In plants overexpressing CRY1 （CRYl-ovx）, however, local resistance is significantly up-regulated. We also show that systemic acquired resistance （SAR） is positively regulated by CRY1, and that salicylic acid （SA）-induced pathogenesis-related gene PR-1 expression is reduced in the cry1 mutant, but enhanced in CRYl-ovx plants. However, our results in- dicate that CRY1 only modestly influences SA accumulation and has no effect on hypersensitive cell death. These results suggest that CRY1 may positively regulate R protein-mediated resistance to P. syringae with increased PR gene expression.