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XAP5 CIRCADIAN TIMEKEEPER Coordinates Light Signals for Proper Timing of Photomorphogenesis and the Circadian Clock in Arabidopsis(W)
- Article from:
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Plant Cell
- Article date:
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May 1, 2008
- Author:
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;
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Copyright informationCopyright American Society of Plant Biologists May 2008. Provided by ProQuest LLC. (Hide copyright information)
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Numerous, varied, and widespread taxa have an internal circadian clock that allows anticipation of rhythmic changes in the environment. We have identified XAP5 CIRCADIAN TIMEKEEPER (XCT), an Arabidopsis thaliana gene important for light regulation of the circadian clock and photomorphogenesis. XC
T is essential for proper clock function: xct mutants display a shortened circadian period in all conditions tested. Interestingly, XCT plays opposite roles in plant responses to light depending both on trait and wavelength. The clock in xct plants is hypersensitive to red but shows normal responses to blue light. By contrast, inhibition of hypocotyl elongation in xct is hyposensitive to red light ...
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