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

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Weller, JL and Batge, SL and Smith, JJ and Kerckhoffs, LHJ and Sineshchekov, VA and Murfet, IC and Reid, JB (2004) A Dominant Mutation in the Pea PHYA Gene Confers Enhanced Responses to Light and Impairs the Light-Dependent Degradation of Phytochrome A. Plant Physiology, 135. pp. 2186-2195. ISSN 0032-0889

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Abstract

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.

Item Type: Article
Journal or Publication Title: Plant Physiology
Page Range: pp. 2186-2195
ISSN: 0032-0889
Identification Number - DOI: 10.1104/pp.103.036103
Additional Information: Copyright © 2004 by the American Society of Plant Biologists
Date Deposited: 19 Sep 2011 06:50
Last Modified: 18 Nov 2014 04:22
URI: http://eprints.utas.edu.au/id/eprint/11841
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