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Science 11 November 2005:
Vol. 310. no. 5750, pp. 1031 - 1034
DOI: 10.1126/science.1117619
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Reports

The Pseudo-Response Regulator Ppd-H1 Provides Adaptation to Photoperiod in Barley

Adrian Turner,* James Beales,* Sébastien Faure, Roy P. Dunford, David A. Laurie{dagger}

Plants commonly use photoperiod (day length) to control the timing of flowering during the year, and variation in photoperiod response has been selected in many crops to provide adaptation to different environments and farming practices. Positional cloning identified Ppd-H1, the major determinant of barley photoperiod response, as a pseudo-response regulator, a class of genes involved in circadian clock function. Reduced photoperiod responsiveness of the ppd-H1 mutant, which is highly advantageous in spring-sown varieties, is explained by altered circadian expression of the photoperiod pathway gene CONSTANS and reduced expression of its downstream target, FT, a key regulator of flowering.

Crop Genetics Department, John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: david.laurie{at}bbsrc.ac.uk

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