Journal Article

An Arabidopsis Cell Growth Defect Factor-Related Protein, CRS, Promotes Plant Senescence by Increasing the Production of Hydrogen Peroxide

Mei Hua Cui, Sung Han Ok, Kyoung Shin Yoo, Kwang Wook Jung, Sang Dong Yoo and Jeong Sheop Shin

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 54, issue 1, pages 155-167
Published in print January 2013 | ISSN: 0032-0781
Published online December 2012 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcs161
An Arabidopsis Cell Growth Defect Factor-Related Protein, CRS, Promotes Plant Senescence by Increasing the Production of Hydrogen Peroxide

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Arabidopsis thaliana Cell Growth Defect factor 1 (Cdf1) has been implicated in promotion of proapoptotic Bax-like cell death via the induction of reactive oxygen species (ROS). Here we report a conserved function of a chloroplast-targeting Cdf-related gene Responsive to Senescence (CRS) using CRS overexpression and loss of function in plants as well as CRS heterologous expression in yeast. CRS expression was strongly induced in senescent leaves, suggesting its main functions during plant senescence. CRS expression in yeast mitochondria increased the ROS level and led to cell death in a manner similar to Cdf1. In whole plants, overexpression of CRS caused the loss of chlorophylls (Chls) and the rapid onset of leaf senescence, while the lack of CRS led to the delay of leaf senescence in a loss-of-function mutant, crs. The higher and lower accumulation of H2O2 was correlated with early and late senescence in CRS-overexpressing and crs mutant plants, respectively. Furthermore, expression of senescence-related marker genes and metacaspase genes was induced in CRS-overexpressing plants in response to dark. Our findings suggest that CRS plays a key role in the leaf senescence process that accompanies H2O2 accumulation resulting in cell death promotion.

Keywords: Arabidopsis thaliana; Bax; Leaf senescence; Programmed cell death; Reactive oxygen species

Journal Article.  7834 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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