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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, Batge, SL, Smith, JJ, Kerckhoffs, LHJ, Sineshchekov, VA, 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, vol. 135 , pp. 2186-2195 , doi: 10.1104/pp.103.036103.

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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
Authors/Creators:Weller, JL and Batge, SL and Smith, JJ and Kerckhoffs, LHJ and Sineshchekov, VA and Murfet, IC and Reid, JB
Journal or Publication Title: Plant Physiology
ISSN: 0032-0889
DOI / ID Number: 10.1104/pp.103.036103
Additional Information:

Copyright © 2004 by the American Society of Plant Biologists

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