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Wiley InterScience | |||||||||
  The Plant JournalVolume 43 Issue 1, Pages 17 - 28 Published Online: 16 May 2005 Journal compilation © 2010 Blackwell Publishing Ltd and the Society for Experimental Biology Published in association with the Society for Experimental Biology
Abstract | References | Full Text: HTML, PDF (Size: 470K) | Related Articles | Citation Tracking  Osmotic regulation of root system architecture Copyright 2005 Blackwell Publishing Ltd KEYWORDS lateral root • root system architecture • osmotic potential • abscisic acid • auxin ABSTRACTAlthough 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. Received 5 January 2005; revised 23 March 2005; accepted 5 April 2005. | 
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