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A Mutation in Plant-Specific SWI2/SNF2-Like Chromatin-Remodeling Proteins, DRD1 and DDM1, Delays Leaf Senescence in Arabidopsis thaliana

A Mutation in Plant-Specific SWI2/SNF2-Like Chromatin-Remodeling Proteins, DRD1 and DDM1, Delays Leaf Senescence in Arabidopsis thaliana
Cho, Eun JuChoi, Seung HeeKim, Ji HongKim, Ji EunLee, Min HeeChung, Byung YeoupWoo, Hye RyunKim, Jin-Hong
DGIST Authors
Woo, Hye Ryun
Issued Date
Article Type
Arabidopsis ThalianaCentromeric RepeatChlorophyll ContentDDM1 GeneDRD1 GeneEpigeneticsGene ExpressionGene MutationGene RepressionGenetic AssociationGenetic ParametersLeaf SenescenceNon-HumanPhotosynthesisPlant GeneProtein ContentProtein FunctionTranscriptionally Silent Information RepeatWild Type
Leaf senescence is a finely regulated complex process; however, evidence for the involvement of epigenetic processes in the regulation of leaf senescence is still fragmentary. Therefore, we chose to examine the functions of DRD1, a SWI2/SNF2 chromatin remodeling protein, in epigenetic regulation of leaf senescence, particularly because drd1-6 mutants exhibited a delayed leaf senescence phenotype. Photosynthetic parameters such as Fv/Fm and ETRmax were decreased in WT leaves compared to leaves of drd1-6 mutants after dark treatment. The WT leaves remarkably lost more chlorophyll and protein content during dark-induced senescence (DIS) than the drd1-6 leaves did. The induction of senescenceassociated genes was noticeably inhibited in the drd1-6 mutant after 5-d of DIS. We compared changes in epigenetic regulation during DIS via quantitative expression analysis of 180-bp centromeric (CEN) and transcriptionally silent information (TSI) repeats. Their expression levels significantly increased in both the WT and the drd1-6 mutant, but did much less in the latter. Moreover, the delayed leaf senescence was observed in ddm1-2 mutants as well as the drd1-6, but not in drd1-p mutants. These data suggest that SWI2/ SNF2 chromatin remodeling proteins such as DRD1 and DDM1 may influence leaf senescence possibly via epigenetic regulation. © 2016 Cho et al.This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Public Library of Science
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  • 우혜련 Woo, Hye Ryun 뉴바이올로지학과
  • Research Interests Genome biology; Epigenomics; Plant senescence
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Department of New Biology CBRG(Complex Biology Research Group) 1. Journal Articles


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