A Dominant Mutation in the Pea PHYA Gene Confers Enhanced Responses to Light and Impairs the Light-Dependent Degradation of Phytochrome A
journal contributionposted on 2023-05-16, 15:01 authored by James WellerJames Weller, Batge, SL, Jennifer SmithJennifer Smith, Kerckhoffs, LH, Sineshchekov, VA, Ian MurfetIan Murfet, James ReidJames Reid
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.
Publication titlePlant Physiology
Department/SchoolSchool of Natural Sciences
PublisherAmerican Society of Plant Biologists
Place of publicationUSA