Integration of Phytochrome and Cryptochrome Signals Determines Plant Growth during Competition for Light.

Details

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State: Public
Version: Author's accepted manuscript
Serval ID
serval:BIB_65099140D580
Type
Article: article from journal or magazin.
Collection
Publications
Title
Integration of Phytochrome and Cryptochrome Signals Determines Plant Growth during Competition for Light.
Journal
Current biology
Author(s)
de Wit M., Keuskamp D.H., Bongers F.J., Hornitschek P., Gommers CMM, Reinen E., Martínez-Cerón C., Fankhauser C., Pierik R.
ISSN
1879-0445 (Electronic)
ISSN-L
0960-9822
Publication state
Published
Issued date
19/12/2016
Peer-reviewed
Oui
Volume
26
Number
24
Pages
3320-3326
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Plants in dense vegetation perceive their neighbors primarily through changes in light quality. Initially, the ratio between red (R) and far-red (FR) light decreases due to reflection of FR by plant tissue well before shading occurs. Perception of low R:FR by the phytochrome photoreceptors induces the shade avoidance response [1], of which accelerated elongation growth of leaf-bearing organs is an important feature. Low R:FR-induced phytochrome inactivation leads to the accumulation and activation of the transcription factors PHYTOCHROME-INTERACTING FACTORs (PIFs) 4, 5, and 7 and subsequent expression of their growth-mediating targets [2, 3]. When true shading occurs, transmitted light is especially depleted in red and blue (B) wavelengths, due to absorption by chlorophyll [4]. Although the reduction of blue wavelengths alone does not occur in nature, long-term exposure to low B light induces a shade avoidance-like response that is dependent on the cryptochrome photoreceptors and the transcription factors PIF4 and PIF5 [5-7]. We show in Arabidopsis thaliana that low B in combination with low R:FR enhances petiole elongation similar to vegetation shade, providing functional context for a low B response in plant competition. Low B potentiates the low R:FR response through PIF4, PIF5, and PIF7, and it involves increased PIF5 abundance and transcriptional changes. Low B attenuates a low R:FR-induced negative feedback loop through reduced gene expression of negative regulators and reduced HFR1 levels. The enhanced response to combined phytochrome and cryptochrome inactivation shows how multiple light cues can be integrated to fine-tune the plant's response to a changing environment.

Keywords
Arabidopsis/growth & development, Arabidopsis/radiation effects, Arabidopsis Proteins, Cryptochromes/physiology, Phototropism, Phytochrome/physiology, Seedlings/growth & development, Signal Transduction, COP1, HFR1, PHYTOCHROME INTERACTING FACTOR, blue light, cryptochrome, phytochrome, plant competition, red:far-red ratio, shade avoidance, signal integration
Pubmed
Web of science
Open Access
Yes
Create date
06/12/2016 19:50
Last modification date
20/08/2019 15:21
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