Journal
CURRENT BIOLOGY
Volume 19, Issue 14, Pages 1216-1220Publisher
CELL PRESS
DOI: 10.1016/j.cub.2009.05.062
Keywords
-
Categories
Funding
- Fogarty International Research Collaboration Award (US-NIH) [6836, R0152413]
Ask authors/readers for more resources
The synergism between red and blue light in the control of plant growth and development [1, 2] requires the coaction of the red light photoreceptor phytochrome B (phyB) and the blue light and UV-A receptor cryptochromes (cry) [3]. Here, we describe the mechanism of the coaction of these photoreceptors in controlling both development and physiology. In seedlings grown under red light, a transient supplement with blue light induced persistent changes in the transcriptome and growth patterns. Blue light enhanced the expression of the transcription factors LONG HYPO COTYL 5 (HY5) and HOMOLOG OF HY5 (HYH) [4] and of SUPPRESSOR OF PHYA 1 (SPA1) and SPA4 [5]. HYS and HYH enhanced phyB signaling output beyond the duration of the blue light signal, and, contrary to their known role as repressors of phyA signaling [5], SPA1 and SPA4 also enhanced phyB signaling. These observations demonstrate that the mechanism of synergism involves the promotion by cry of positive regulators of phyB signaling. The persistence of the light-derived signal into the night commits the seedling to a morphogenetic and physiological program consistent with a photosynthetic lifestyle.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available