Osmotic regulation of root system architecture
Article first published online: 16 MAY 2005
The Plant Journal
Volume 43, Issue 1, pages 17–28, July 2005
How to Cite
Deak, K. I. and Malamy, J. (2005), Osmotic regulation of root system architecture. The Plant Journal, 43: 17–28. doi: 10.1111/j.1365-313X.2005.02425.x
- Issue published online: 16 MAY 2005
- Article first published online: 16 MAY 2005
- Received 5 January 2005; revised 23 March 2005; accepted 5 April 2005.
- lateral root;
- root system architecture;
- osmotic potential;
- abscisic acid;
Although root system architecture is known to be highly plastic and strongly affected by environmental conditions, we have little understanding of the underlying mechanisms controlling root system development. Here we demonstrate that the formation of a lateral root from a lateral root primordium is repressed as water availability is reduced. This osmotic-responsive regulatory mechanism requires abscisic acid (ABA) and a newly identified gene, LRD2. Mutant analysis also revealed interactions of ABA and LRD2 with auxin signaling. Surprisingly, further examination revealed that both ABA and LRD2 control root system architecture even in the absence of osmotic stress. This suggests that the same molecules that mediate responses to environmental cues can also be regulators of intrinsic developmental programs in the root system.