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JXB Advance Access originally published online on December 12, 2003
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Journal of Experimental Botany, Vol. 55, No. 395, pp. 271-276, January 1, 2004
© 2004 Oxford University Press

Light Signalling and Clock

Light signals, phytochromes and cross-talk with other environmental cues

Received 29 April 2003; Accepted 8 October 2003

Keara A. Franklin and Garry C. Whitelam*

Department of Biology, University of Leicester, Leicester LE1 7RH, UK

* To whom correspondence should be addressed. Fax: +44 (0)116 252 2791. E-mail: gcw1{at}le.ac.uk

Plants have evolved highly complex sensory mechanisms to monitor their surroundings and adapt their growth and development to the prevailing environmental conditions. The integration of information from multiple environmental cues enables the co-ordination of development with favourable seasonal conditions and, ultimately, determines plant form. Light signals, perceived via the phytochrome, cryptochrome and phototropin photoreceptor families, are especially important environmental signals. Redundancy of function among phytochromes and their interaction with blue light photoreceptors enhance sensitivity to light signals, facilitating the accurate detection of, and response to, environmental fluctuations. In this review, current understanding of Arabidopsis phytochrome functions will be summarized, in particular, the interactions among the phytochromes and the integration of light signals with directional and temperature sensing mechanisms.

Key words: Arabidopsis, environmental cues, light signals, photoreceptors, temperature sensing mechanisms.


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