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DEVELOPMENT AND HORMONE ACTION

A Dominant Mutation in the Pea PHYA Gene Confers Enhanced Responses to Light and Impairs the Light-Dependent Degradation of Phytochrome A¹

School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia (J.L.W., S.L.B., J.J.S., L.H.J.K., I.C.M., J.B.R.); and Biology Department, M.V. Lomonosov Moscow State University, Moscow 119899, Russia (V.A.S.)

Phytochrome A (phyA) is an important photoreceptor controlling many processes throughout the plant life cycle. It is unique within the phytochrome family for its ability to mediate photomorphogenic responses to continuous far-red light and for the strong photocontrol of its transcript level and protein stability. Here we describe a dominant mutant of garden pea (Pisum sativum) that displays dramatically enhanced responses to light, early photoperiod-independent flowering, and impaired photodestruction of phyA. The mutant carries a single base substitution in the PHYA gene that is genetically inseparable from the mutant phenotype. This substitution is predicted to direct the replacement of a conserved Ala in an N-terminal region of PHYA that is highly divergent between phyA and other phytochromes. This result identifies a region of the phyA photoreceptor molecule that may play an important role in its fate after photoconversion.

² Present address: Crop and Food Research, 265 Lawn Road, Hastings, New Zealand.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.103.036103.

^* Corresponding author; e-mail jim.weller{at}utas.edu.au; fax 61–3–6226–2698.

Received November 11, 2003; returned for revision April 14, 2004; accepted April 29, 2004.

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