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JXB Advance Access published online on October 8, 2009
Journal of Experimental Botany, doi:10.1093/jxb/erp304
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

REVIEW-ARTICLE

Phytochrome functions in Arabidopsis development

Keara A. Franklin1,* and Peter H. Quail2,3

1Department of Biology, University of Leicester, Leicester LE1 7RH, UK
2Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA
3United States Department of Agriculture, Plant Gene Expression Centre, Albany, CA 94710, USA

* To whom correspondence should be addressed: E-mail: kaf{at}leicester.ac.uk

Light signals are fundamental to the growth and development of plants. Red and far-red light are sensed using the phytochrome family of plant photoreceptors. Individual phytochromes display both unique and overlapping roles throughout the life cycle of plants, regulating a range of developmental processes from seed germination to the timing of reproductive development. The evolution of multiple phytochrome photoreceptors has enhanced plant sensitivity to fluctuating light environments, diversifying phytochrome function, and facilitating conditional cross-talk with other signalling systems. The isolation of null mutants, deficient in all individual phytochromes, has greatly advanced understanding of phytochrome functions in the model species, Arabidopsis thaliana. The creation of mutants null for multiple phytochrome combinations has enabled the dissection of redundant interactions between family members, revealing novel regulatory roles for this important photoreceptor family. In this review, current knowledge of phytochrome functions in the light-regulated development of Arabidopsis is summarised.

Key words: Arabidopsis, light signals, photomorphogenesis, phytochrome

Received 17 August 2009; Revised 15 September 2009 Accepted 16 September 2009


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