Authors with equal contribution listed alphabetically.
Phytochrome interacting factors 4 and 5 control seedling growth in changing light conditions by directly controlling auxin signaling
Article first published online: 22 JUN 2012
© 2012 The Authors. The Plant Journal © 2012 Blackwell Publishing Ltd
The Plant Journal
Volume 71, Issue 5, pages 699–711, September 2012
How to Cite
Hornitschek, P., Kohnen, M. V., Lorrain, S., Rougemont, J., Ljung, K., López-Vidriero, I., Franco-Zorrilla, J. M., Solano, R., Trevisan, M., Pradervand, S., Xenarios, I. and Fankhauser, C. (2012), Phytochrome interacting factors 4 and 5 control seedling growth in changing light conditions by directly controlling auxin signaling. The Plant Journal, 71: 699–711. doi: 10.1111/j.1365-313X.2012.05033.x
- Issue published online: 24 AUG 2012
- Article first published online: 22 JUN 2012
- Accepted manuscript online: 26 APR 2012 11:40AM EST
- Received 13 March 2012; revised 18 April 2012; accepted 19 April 2012; published online 22 June 2012.
- shade avoidance;
- phytochrome-interacting factor;
- ChIP sequencing;
- Arabidopsis thaliana
Plant growth is strongly influenced by the presence of neighbors that compete for light resources. In response to vegetational shading shade-intolerant plants such as Arabidopsis display a suite of developmental responses known as the shade-avoidance syndrome (SAS). The phytochrome B (phyB) photoreceptor is the major light sensor to mediate this adaptive response. Control of the SAS occurs in part with phyB, which controls protein abundance of phytochrome-interacting factors 4 and 5 (PIF4 and PIF5) directly. The shade-avoidance response also requires rapid biosynthesis of auxin and its transport to promote elongation growth. The identification of genome-wide PIF5-binding sites during shade avoidance revealed that this bHLH transcription factor regulates the expression of a subset of previously identified SAS genes. Moreover our study suggests that PIF4 and PIF5 regulate elongation growth by controlling directly the expression of genes that code for auxin biosynthesis and auxin signaling components.