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Cited by 561

The DOI matches its Crossref record; 334 of the 334 references it cites were found in a registry or an index.

Phytochrome Signaling Mechanisms

Open access
Li, Jigang, Li, Gang, Wang, Haiyang, Wang Deng, Xing·2011·The Arabidopsis Book
DOI 10.1199/tab.0148
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Abstract

Phytochromes are red (R)/far-red (FR) light photoreceptors that play fundamental roles in photoperception of the light environment and the subsequent adaptation of plant growth and development. There are five distinct phytochromes in Arabidopsis thaliana, designated phytochrome A (phyA) to phyE. phyA is light-labile and is the primary photoreceptor responsible for mediating photomorphogenic responses in FR light, whereas phyB-phyE are light stable, and phyB is the predominant phytochrome regulating de-etiolation responses in R light. Phytochromes are synthesized in the cytosol in their inactive Pr form. Upon light irradiation, phytochromes are converted to the biologically active Pfr form, and translocate into the nucleus. phyB can enter the nucleus by itself in response to R light, whereas phyA nuclear import depends on two small plant-specific proteins FAR-RED ELONGATED HYPOCOTYL 1 (FHY1) and FHY1-LIKE (FHL). Phytochromes may function as light-regulated serine/threonine kinases, and can phosphorylate several substrates, including themselves in vitro. Phytochromes are phosphoproteins, and can be dephosphorylated by a few protein phosphatases. Photoactivated phytochromes rapidly change the expression of light-responsive genes by repressing the activity of CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1), an E3 ubiquitin ligase targeting several photomorphogenesis-promoting transcription factors for degradation, and by inducing rapid phosphorylation and degradation of Phytochrome-Interacting Factors (PIFs), a group of bHLH transcription factors repressing photomorphogenesis. Phytochromes are targeted by COP1 for degradation via the ubiquitin/26S proteasome pathway.

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Metadata

Authors
Li, J., Li, G., Wang, H., & Wang Deng, X.
Venue
The Arabidopsis Book
Publisher
BioOne
Published
2011-01
Volume
9
Pages
e0148
ISSN
1543-8120 (ISSN-L)
DOI
10.1199/tab.0148
OpenAlex
W2152382014
Cited by
561
References
334
FWCI
18.89
Type
journal article
Language
en
Open access
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