Journal
SEMINARS IN CELL & DEVELOPMENTAL BIOLOGY
Volume 24, Issue 5, Pages 407-413Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.semcdb.2013.02.006
Keywords
Circadian clock; Photoperiodic flowering; Phenology; Diurnal growth; Cold acclimation; Adaptation
Categories
Funding
- National Institutes of Health [GM079712]
- University of Washington Royalty Research Fund
- National Science Foundation
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The plant circadian clock is involved in the regulation of numerous processes. It serves as a timekeeper to ensure that the onset of key developmental events coincides with the appropriate conditions. Although internal oscillating clock mechanisms likely evolved in response to the earth's predictable day and night cycles, organisms must integrate a range of external and internal cues to adjust development and physiology. Here we introduce three different clock outputs to illustrate the complexity of clock control. Clock-regulated diurnal growth is altered by environmental stimuli. The complexity of the photoperiodic flowering pathway highlights numerous nodes through which plants may integrate information to modulate the timing of flowering. Comparative analyses among ecotypes that differ in flowering response reveal additional environmental cues and molecular processes that have developed to influence flowering. We also explore the process of cold acclimation, where circadian inputs, light quality, and stress responses converge to improve freezing tolerance in anticipation of colder temperatures. (C) 2013 Elsevier Ltd. All rights reserved.
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