title: The Arabidopsis LSD1 gene plays an important role in the regulation of low temperature-dependent cell death.
abstract: In higher plants, the crosstalk between cold stress responses and reactive oxygen species (ROS) signaling is not well understood. *Two chilling-sensitive mutants, chs4-1 and chs4-3, were characterized genetically and molecularly. *The CHS4 gene, identified by map-based cloning, was found to be identical to lesion simulating disease resistance 1 (LSD1). We therefore renamed these two alleles lsd1-3 and lsd1-4, respectively. These two mutants exhibited an extensive cell death phenotype under cold stress conditions. Consistently, lsd1-3 plants exposed to cold showed up-regulation of the PR1 and PR2 genes, and increased accumulation of salicylic acid. These results indicate that low temperature is another trigger of cell death in lsd1 mutants. Furthermore, lsd1-3 plants accumulated higher concentrations of H(2)O(2) and total glutathione under cold conditions than wild-type plants. Genetic analysis revealed that PAD4 and EDS1, two key signaling regulators mediating resistance responses, are required for the chilling-sensitive phenotype of lsd1-3. *These findings reveal a role of LSD1 in regulating cell death trigged by cold stress and a link between cold stress responses and ROS-associated signaling.
authors.affiliation: State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Xiaozhen
authors.initials: X
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Plant Genomics and National Plant Gene Research Center, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Yansha
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Plant Genomics and National Plant Gene Research Center, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Jianru
authors.initials: J
authors.lastname: Zuo
authors.affiliation: State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Shuhua
authors.initials: S
authors.lastname: Yang
mesh_terms: D000483:Alleles; D017360:Arabidopsis / Q000166:cytology* / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D016923:Cell Death / Q000235:genetics; D002462:Cell Membrane / Q000378:metabolism; D003001:Cloning, Molecular; D003080:Cold Temperature; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant / Q000235:genetics*; D005978:Glutathione / Q000378:metabolism; D009154:Mutation / Q000235:genetics; D010641:Phenotype; D017382:Reactive Oxygen Species / Q000378:metabolism; D013312:Stress, Physiological / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D004268:DNA-Binding Proteins; C104920:LSD1 protein, Arabidopsis; D017382:Reactive Oxygen Species; D014157:Transcription Factors; D005978:Glutathione
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