Nuclear phytochrome a signaling promotes phototropism in Arabidopsis.

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Version: Author's accepted manuscript
Serval ID
serval:BIB_9AA1E61E7943
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Nuclear phytochrome a signaling promotes phototropism in Arabidopsis.
Journal
Plant Cell
Author(s)
Kami C., Hersch M., Trevisan M., Genoud T., Hiltbrunner A., Bergmann S., Fankhauser C.
ISSN
1532-298X (Electronic)
ISSN-L
1040-4651
Publication state
Published
Issued date
2012
Volume
24
Number
2
Pages
566-576
Language
english
Notes
Publication types: Journal ArticlePublication Status: ppublish
Abstract
Phototropin photoreceptors (phot1 and phot2 in Arabidopsis thaliana) enable responses to directional light cues (e.g., positive phototropism in the hypocotyl). In Arabidopsis, phot1 is essential for phototropism in response to low light, a response that is also modulated by phytochrome A (phyA), representing a classical example of photoreceptor coaction. The molecular mechanisms underlying promotion of phototropism by phyA remain unclear. Most phyA responses require nuclear accumulation of the photoreceptor, but interestingly, it has been proposed that cytosolic phyA promotes phototropism. By comparing the kinetics of phototropism in seedlings with different subcellular localizations of phyA, we show that nuclear phyA accelerates the phototropic response, whereas in the fhy1 fhl mutant, in which phyA remains in the cytosol, phototropic bending is slower than in the wild type. Consistent with this data, we find that transcription factors needed for full phyA responses are needed for normal phototropism. Moreover, we show that phyA is the primary photoreceptor promoting the expression of phototropism regulators in low light (e.g., PHYTOCHROME KINASE SUBSTRATE1 [PKS1] and ROOT PHOTO TROPISM2 [RPT2]). Although phyA remains cytosolic in fhy1 fhl, induction of PKS1 and RPT2 expression still occurs in fhy1 fhl, indicating that a low level of nuclear phyA signaling is still present in fhy1 fhl.
Pubmed
Web of science
Open Access
Yes
Create date
28/04/2012 12:22
Last modification date
20/08/2019 15:01
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