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Light and Ethylene Coordinately Regulate the Phosphate Starvation Response through Transcriptional Regulation of PHOSPHATE STARVATION RESPONSE1 .
- Source :
-
The Plant cell [Plant Cell] 2017 Sep; Vol. 29 (9), pp. 2269-2284. Date of Electronic Publication: 2017 Aug 25. - Publication Year :
- 2017
-
Abstract
- Plants have evolved an array of adaptive responses to low Pi availability, a process modulated by various external stimuli and endogenous growth regulatory signals. Little is known about how these signaling processes interact to produce an integrated response. Arabidopsis thaliana PHOSPHATE STARVATION RESPONSE1 ( PHR1 ) encodes a conserved MYB-type transcription factor that is essential for programming Pi starvation-induced gene expression and downstream Pi starvation responses (PSRs). Here, we show that loss-of-function mutations in FHY3 and FAR1 , encoding two positive regulators of phytochrome signaling, and in EIN3 , encoding a master regulator of ethylene responses, cause attenuated PHR1 expression, whereas mutation in HY5 , encoding another positive regulator of light signaling, causes increased PHR1 expression. FHY3, FAR1, HY5, and EIN3 directly bind to the PHR1 promoter through distinct cis -elements. FHY3, FAR1, and EIN3 activate, while HY5 represses, PHR1 expression. FHY3 directly interacts with EIN3, and HY5 suppresses the transcriptional activation activity of FHY3 and EIN3 on PHR1 Finally, both light and ethylene promote FHY3 protein accumulation, and ethylene blocks the light-promoted stabilization of HY5. Our results suggest that light and ethylene coordinately regulate PHR1 expression and PSRs through signaling convergence at the PHR1 promoter.<br /> (© 2017 American Society of Plant Biologists. All rights reserved.)
- Subjects :
- Arabidopsis drug effects
Arabidopsis Proteins metabolism
Base Sequence
Models, Biological
Promoter Regions, Genetic
Protein Binding drug effects
Protein Binding radiation effects
Protein Stability drug effects
Protein Stability radiation effects
Transcription Factors metabolism
Arabidopsis genetics
Arabidopsis radiation effects
Arabidopsis Proteins genetics
Ethylenes pharmacology
Gene Expression Regulation, Plant drug effects
Gene Expression Regulation, Plant radiation effects
Light
Phosphates deficiency
Transcription Factors genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1532-298X
- Volume :
- 29
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- The Plant cell
- Publication Type :
- Academic Journal
- Accession number :
- 28842534
- Full Text :
- https://doi.org/10.1105/tpc.17.00268