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Light receptor action is critical for maintaining plant biomass at warm ambient temperatures
- Source :
- The Plant Journal. 65:441-452
- Publication Year :
- 2010
- Publisher :
- Wiley, 2010.
-
Abstract
- The ability to withstand environmental temperature variation is essential for plant survival. Former studies in Arabidopsis revealed that light signalling pathways had a potentially unique role in shielding plant growth and development from seasonal and daily fluctuations in temperature. In this paper we describe the molecular circuitry through which the light receptors cry1 and phyB buffer the impact of warm ambient temperatures. We show that the light signalling component HFR1 acts to minimise the potentially devastating effects of elevated temperature on plant physiology. Light is known to stabilise levels of HFR1 protein by suppressing proteasome-mediated destruction of HFR1. We demonstrate that light-dependent accumulation and activity of HFR1 are highly temperature dependent. The increased potency of HFR1 at warmer temperatures provides an important restraint on PIF4 that drives elongation growth. We show that warm ambient temperatures promote the accumulation of phosphorylated PIF4. However, repression of PIF4 activity by phyB and cry1 (via HFR1) is critical for controlling growth and maintaining physiology as temperatures rise. Loss of this light-mediated restraint has severe consequences for adult plants which have greatly reduced biomass.
- Subjects :
- 0106 biological sciences
0303 health sciences
Phytochrome
Plant physiology
Biomass
Cell Biology
Plant Science
15. Life on land
Biology
biology.organism_classification
01 natural sciences
03 medical and health sciences
Cryptochrome
13. Climate action
Arabidopsis
Botany
Genetics
Biophysics
Arabidopsis thaliana
Elongation
Receptor
030304 developmental biology
010606 plant biology & botany
Subjects
Details
- ISSN :
- 09607412
- Volume :
- 65
- Database :
- OpenAIRE
- Journal :
- The Plant Journal
- Accession number :
- edsair.doi...........7576c34f6c81e4928d49aa328479fd9a