Premium
Arabidopsis STAYGREEN‐LIKE (SGRL) promotes abiotic stress‐induced leaf yellowing during vegetative growth
Author(s) -
Sakuraba Yasuhito,
Kim Dami,
Kim Ye-Sol,
Hörtensteiner Stefan,
Paek Nam-Chon
Publication year - 2014
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2014.09.018
Subject(s) - arabidopsis , abiotic stress , abiotic component , chlorophyll , biology , botany , arabidopsis thaliana , senescence , mutant , microbiology and biotechnology , biochemistry , gene , paleontology
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.