Journal
FEBS LETTERS
Volume 583, Issue 15, Pages 2521-2526Publisher
WILEY
DOI: 10.1016/j.febslet.2009.07.007
Keywords
Arabidopsis; ATP; Heterotrimeric G-protein; Touch desensitization
Funding
- NIGMS [GM6598901]
- DOE [DE-FG02-05er15671]
- NSF [MCB-0718202, 0723515, MCB 0641288, IBN 03-36738, DBI 0301460]
- USDA [2005-35319-16192]
- Cystic Fibrosis Foundation [R026-CR02]
- NIH NIBIB [P41-EB002025-23A1]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [0723515] Funding Source: National Science Foundation
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Amongst the many stimuli orienting the growth of plant roots, of critical importance are the touch signals generated as roots explore the mechanically complex soil environment. However, the molecular mechanisms behind these sensory events remain poorly defined. We report an impaired obstacle-avoiding response of roots in Arabidopsis lacking a heterotrimeric G-protein. Obstacle avoidance may utilize a touch-induced release of ATP to the extracellular space. While sequential touch stimulation revealed a strong refractory period for ATP release in response to mechano-stimulation in wild-type plants, the refractory period in mutants was attenuated, resulting in extracellular ATP accumulation. We propose that ATP acts as an extracellular signal released by mechano-stimulation and that the G-protein complex is needed for fine-tuning this response. (c) 2009 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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