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Age-associated circadian period changes in Arabidopsis leaves

Title
Age-associated circadian period changes in Arabidopsis leaves
Authors
Kim, H[Kim, Hyunmin]Kim, Y[Kim, Yumi]Yeom, M[Yeom, Miji]Lim, J[Lim, Junhyun]Nam, HG[Nam, Hong Gil]
DGIST Authors
Kim, Y[Kim, Yumi]; Nam, HG[Nam, Hong Gil]
Issue Date
2016-04
Citation
Journal of Experimental Botany, 67(9), 2665-2673
Type
Article
Article Type
Article
Keywords
ArabidopsisCircadian ClockDay LengthLeaf AgePlant Life HistoryTOC1
ISSN
0022-0957
Abstract
As most organisms age, their appearance, physiology, and behaviour alters as part of a life history strategy that maximizes their fitness over their lifetime. The passage of time is measured by organisms and is used to modulate these age-related changes. Organisms have an endogenous time measurement system called the circadian clock. This endogenous clock regulates many physiological responses throughout the life history of organisms to enhance their fitness. However, little is known about the relation between ageing and the circadian clock in plants. Here, we investigate the association of leaf ageing with circadian rhythm changes to better understand the regulation of life-history strategy in Arabidopsis. The circadian periods of clock output genes were approximately 1h shorter in older leaves than younger leaves. The periods of the core clock genes were also consistently shorter in older leaves, indicating an effect of ageing on regulation of the circadian period. Shortening of the circadian period with leaf age occurred faster in plants grown under a long photoperiod compared with a short photoperiod. We screened for a regulatory gene that links ageing and the circadian clock among multiple clock gene mutants. Only mutants for the clock oscillator TOC1 did not show a shortened circadian period during leaf ageing, suggesting that TOC1 may link age to changes in the circadian clock period. Our findings suggest that age-related information is incorporated into the regulation of the circadian period and that TOC1 is necessary for this integrative process. © 2016 The Author 2016.
URI
http://hdl.handle.net/20.500.11750/1548
DOI
10.1093/jxb/erw097
Publisher
OXFORD UNIV PRESS
Related Researcher
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Collection:
New BiologyETC1. Journal Articles


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