Journal Article

Increased Stability of LHCII by Aggregate Formation during Dark-Induced Leaf Senescence in the <i>Arabidopsis</i> Mutant, <i>ore10</i>

Min-Hyuk Oh, Yong-Hwan Moon and Choon-Hwan Lee

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 12, pages 1368-1377
Published in print December 2003 | ISSN: 0032-0781
Published online December 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg170
Increased Stability of LHCII by Aggregate Formation during Dark-Induced Leaf Senescence in the Arabidopsis Mutant, ore10

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Leaf senescence in a stay-green mutant of Arabidopsis thaliana, ore10, was investigated during dark-incubation of its detached leaves. During this dark-induced senescence (DIS), Chl loss was delayed in ore10 mutants, as compared with wild type, but the rate of decline in the photochemical efficiency of PSII was not delayed in mutant leaves. After 2 d of DIS, native green gel electrophoresis of ore 10 leaf proteins resulted in a significant amount of pigment remaining as aggregates on top of the stacking gel. In addition, the accumulation of aggregates coincided with the emergence of a new band near 700 nm (F699) in the 77 K fluorescence emission spectrum of the aggregates. At 4 d, F699 became a major band, both in the isolated aggregates and in intact leaves. Prolonged treatment with detergents revealed that light-harvesting complex II (LHCII) remaining after 2 d was highly stable, and the accumulation of aggregates coincided with the appearance of truncated LHCII in senescing ore10 leaves. These results suggest that increased LHCII stability is due to the formation of aggregates of trimmed LHCII. Thus, the LHCII protein degradation step that follows proteolysis of its terminal peptides is a possible lesion site of the ore10 mutant.

Keywords: Keywords: Aggregate — Arabidopsis thaliana — Chl–protein complex — Leaf senescence — Light-harvesting complex II — Stay-green mutant.; Abbreviations: DIS, dark-induced senescence; LHCII, light-harvesting complex II; WT, wild type.

Journal Article.  7289 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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