A pair of light signaling factors FHY3 and FAR1 regulates plant immunity by modulating chlorophyll biosynthesis

查看全文 作　　者：Wanqing [1]Wang;Weijiang [1]Tang;Tingting [1]Ma;De [2]Niu;Jing Bo [2]Jin;Haiyang [3]Wang;Rongcheng [1,4]Lin

机构地区：[1]Key Laboratory of Photobiology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China;[2]Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China;[3]Biotechnology Research Institute, the Chinese Academy of Agricultural Sciences, Beijing 100081, China;[4]National Center for Plant Gene Research, Beijing 100093, China

出　　处：《Journal of Integrative Plant Biology》索引2016年第58卷第1期,共13页

基　　金：supported by grants from the National Natural Science Foundation of China(31170221,31325002 and 31300206);the Ministry of Agriculture of China(2014ZX08009-003) 摘　　要：Light and chloroplast function is known to affect the plant immune response; however, the underlying mechanism remains elusive. We previously demonstrated that two light signaling factors, FAR-RED ELONGATED HYPOCOTYL 3(FHY3)and FAR-RED IMPAIRED RESPONSE 1(FAR1), regulate chlorophyll biosynthesis and seedling growth via controlling HEMB1 expression in Arabidopsis thaliana. In this study, we reveal that FHY3 and FAR1 are involved in modulating plant immunity. We showed that the fhy3 far1 double null mutant displayed high levels of reactive oxygen species and salicylic acid(SA) and increased resistance to Pseudomonas syringae pathogen infection. Microarray analysis revealed that a large proportion of pathogen-related genes, particularly genes encoding nucleotide-binding and leucine-rich repeat domain resistant proteins, are highly induced in fhy3 far1. Genetic studies indicated that the defects of fhy3 far1 can be largely rescued by reducing SA signaling or blocking SA accumulation, and by overexpression of HEMB1, which encodes a 5-aminolevulinic acid dehydratase in the chlorophyll biosynthetic pathway.Furthermore, we found that transgenic plants with reduced expression of HEMB1 exhibit a phenotype similar to fhy3 far1.Taken together, this study demonstrates an important role of FHY3 and FAR1 in regulating plant immunity, through integrating chlorophyll biosynthesis and the SA signaling pathway. 关键词：生物合成途径植物免疫叶绿素合成调控信号因子富含亮氨酸重复序列 5-氨基乙酰丙酸对光

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A pair of light signaling factors FHY3 and FAR1 regulates plant immunity by modulating chlorophyll biosynthesis

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