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Title: FHY1: a phytochrome A-specific signal transducer.
Authors: Desnos, T.
Puente, P.
Whitelam, Garry C.
Harberd, N.P.
First Published: 15-Nov-2001
Publisher: Cold Spring Harbor Laboratory Press
Citation: Genes and Development, 2001, 15 (22), pp. 2980-2990
Abstract: Phytochromes are plant photoreceptors that regulate plant growth and development with respect to the light environment. Following the initial light-perception event, the phytochromes initiate a signal-transduction process that eventually results in alterations in cellular behavior, including gene expression. Here we describe the molecular cloning and functional characterization of Arabidopsis FHY1. FHY1 encodes a product (FHY1) that specifically transduces signals downstream of the far-red (FR) light-responsive phytochrome A (PHYA) photoreceptor. We show that FHY1 is a novel light-regulated protein that accumulates in dark (D)-grown but not in FR-grown hypocotyl cells. In addition, FHY1 transcript levels are regulated by light, and by the product of FHY3, another gene implicated in FR signaling. These observations indicate that FHY1 function is both FR-signal transducing and FR-signal regulated, suggesting a negative feedback regulation of FHY1 function. Seedlings homozygous for loss-of-function fhy1 alleles are partially blind to FR, whereas seedlings overexpressing FHY1exhibit increased responses to FR, but not to white (WL) or red (R) light. The increased FR-responses conferred by overexpression ofFHY1 are abolished in a PHYA-deficient mutant background, showing that FHY1 requires a signal from PHYA for function, and cannot modulate growth independently of PHYA.
DOI Link: 10.1101/gad.205401
ISSN: 0890-9369
eISSN: 1549-5477
Version: Publisher Version
Status: Peer-reviewed
Type: Article
Rights: Copyright © 2001, Cold Spring Harbor Laboratory Press. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Biology

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