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Arabidopsis STAYGREEN-LIKE (SGRL) promotes abiotic stress-induced leaf yellowing during vegetative growth.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Sakuraba Yasuhito, Kim Dami, Kim Ye-Sol, Hörtensteiner Stefan, Paek Nam-Chon,
Project Chlorophyll breakdown: catabolite modification and transport, and the relation to stoma function and cell death signalling
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Original article (peer-reviewed)

Journal FEBS letters
Volume (Issue) 588(21)
Page(s) 3830 - 7
Title of proceedings FEBS letters
DOI 10.1016/j.febslet.2014.09.018

Open Access

URL http://www.sciencedirect.com/science/article/pii/S0014579314006942?via%3Dihub
Type of Open Access Publisher (Gold Open Access)

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.
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