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

Overview

Journal Plant Physiol

Specialty Physiology

Date 2004 Aug 3

PMID 15286297

Citations 26

Authors

James L Weller

Shona L Batge

Jennifer J Smith

L Huub J Kerckhoffs

Vitaly A Sineshchekov

Ian C Murfet

James B Reid

Affiliations

Soon will be listed here.

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.

Citing Articles

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