Abstract
During leaf senescence in Arabidopsis, STAYGREEN 1 (SGR1) and SGR2 regulate chlorophyll degradation positively and negatively, respectively. SGR-LIKE (SGRL) is also expressed in pre-senescing leaves, but its function remains largely unknown. Here we show that under abiotic stress, Arabidopsis plants overexpressing SGRL exhibit early leaf yellowing and sgrl-1 mutants exhibit persistent green color of leaves. Under salt stress, SGR1 and SGRL act synergistically for rapid Chl degradation prior to senescence. Furthermore, SGRL forms homo- and heterodimers with SGR1 and SGR2 in vivo, and interacts with LHCII and chlorophyll catabolic enzymes. The role of SGRL under abiotic stress is discussed.
Keywords:
Abiotic stress; Chlorophyll degradation; STAYGREEN; STAYGREEN-LIKE.
Copyright © 2014 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Arabidopsis / cytology
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Arabidopsis / growth & development*
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Arabidopsis / metabolism*
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Arabidopsis / physiology
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Arabidopsis Proteins / chemistry
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Arabidopsis Proteins / genetics
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Arabidopsis Proteins / metabolism*
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Chloroplast Proteins
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Gene Knockout Techniques
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Light-Harvesting Protein Complexes / metabolism
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Mutation
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Osmotic Pressure
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Phenotype
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Phospholipases / chemistry
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Pigmentation* / drug effects
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Plant Leaves / cytology
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Plant Leaves / growth & development*
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Plant Leaves / metabolism*
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Plant Leaves / physiology
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Protein Multimerization
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Protein Structure, Quaternary
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Protein Subunits / metabolism
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Salts / pharmacology
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Stress, Physiological* / drug effects
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Thylakoids / drug effects
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Thylakoids / metabolism
Substances
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Arabidopsis Proteins
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Chloroplast Proteins
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Light-Harvesting Protein Complexes
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Protein Subunits
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SGR2 protein, Arabidopsis
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Salts
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Phospholipases
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SGR2 phospholipase, Arabidopsis