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Delayed degradation of chlorophylls and photosynthetic proteins in Arabidopsis autophagy mutants during stress-induced leaf yellowing

Cited 42 time in Web of Science Cited 47 time in Scopus
Authors
Sakuraba, Yasuhito; Lee, Sang-Hwa; Kim, Ye-Sol ; Park, Ohkmae K. ; Hortensteiner, Stefan; Paek, Nam-Chon
Issue Date
2014-04
Publisher
OXFORD UNIV PRESS
Citation
JOURNAL OF EXPERIMENTAL BOTANY Vol.65 No.14, pp. 3915-3925
Keywords
농수해양Abiotic stressArabidopsis thalianaautophagyatg5chlorophyll degradationleaf senescencestay-green
Abstract
Plant autophagy, one of the essential proteolysis systems, balances proteome and nutrient levels in cells of the whole plant. Autophagy has been studied by analysing Arabidopsis thaliana autophagy-defective atg mutants, but the relationship between autophagy and chlorophyll (Chl) breakdown during stress-induced leaf yellowing remains unclear. During natural senescence or under abiotic-stress conditions, extensive cell death and early yellowing occurs in the leaves of atg mutants. A new finding is revealed that atg5 and atg7 mutants exhibit a functional stay-green phenotype under mild abiotic-stress conditions, but leaf yellowing proceeds normally in wild-type leaves under these conditions. Under mild salt stress, atg5 leaves retained high levels of Chls and all photosystem proteins and maintained a normal chloroplast structure. Furthermore, a double mutant of atg5 and non-functional stay-green nonyellowing1-1 (atg5 nye1-1) showed a much stronger stay-green phenotype than either single mutant. Taking these results together, it is proposed that autophagy functions in the non-selective catabolism of Chls and photosynthetic proteins during stress-induced leaf yellowing, in addition to the selective degradation of Chl-apoprotein complexes in the chloroplasts through the senescence-induced STAY-GREEN1/NYE1 and Chl catabolic enzymes.
ISSN
0022-0957
Language
English
URI
http://hdl.handle.net/10371/92615
DOI
https://doi.org/10.1093/jxb/eru008
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Plant Science (식물생산과학부)Journal Papers (저널논문_식물생산과학부)
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