title: Arabidopsis STAYGREEN-LIKE (SGRL) promotes abiotic stress-induced leaf yellowing during vegetative growth.
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.
authors.affiliation: Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea. Electronic address: sakuraba0425@gmail.com.
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Sakuraba
authors.affiliation: Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea.
authors.forename: Dami
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea.
authors.forename: Ye-Sol
authors.initials: YS
authors.lastname: Kim
authors.affiliation: Institute of Plant Biology, University of Zurich, CH-8008 Zurich, Switzerland.
authors.forename: Stefan
authors.initials: S
authors.lastname: Hörtensteiner
authors.affiliation: Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea. Electronic address: ncpaek@snu.ac.kr.
authors.forename: Nam-Chon
authors.initials: NC
authors.lastname: Paek
mesh_terms: D017360:Arabidopsis / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism* / Q000502:physiology; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D060365:Chloroplast Proteins; D055786:Gene Knockout Techniques; D045342:Light-Harvesting Protein Complexes / Q000378:metabolism; D009154:Mutation; D009997:Osmotic Pressure; D010641:Phenotype; D010740:Phospholipases / Q000737:chemistry; D010858:Pigmentation / Q000187:drug effects; D018515:Plant Leaves / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism* / Q000502:physiology; D055503:Protein Multimerization; D020836:Protein Structure, Quaternary; D021122:Protein Subunits / Q000378:metabolism; D012492:Salts / Q000494:pharmacology; D013312:Stress, Physiological / Q000187:drug effects; D020524:Thylakoids / Q000187:drug effects / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D060365:Chloroplast Proteins; D045342:Light-Harvesting Protein Complexes; D021122:Protein Subunits; C000594663:SGR2 protein, Arabidopsis; D012492:Salts; D010740:Phospholipases; C455511:SGR2 phospholipase, Arabidopsis
keywords: Abiotic stress; Chlorophyll degradation; STAYGREEN; STAYGREEN-LIKE