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Touch induces ATP release in Arabidopsis roots that is modulated by the heterotrimeric G-protein complex.
Weerasinghe, Ravisha R; Swanson, Sarah J; Okada, Seiko F; Garrett, Michele B; Kim, Sung-Yong; Stacey, Gary; Boucher, Richard C; Gilroy, Simon; Jones, Alan M.
Afiliação
  • Weerasinghe RR; Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA.
FEBS Lett ; 583(15): 2521-6, 2009 Aug 06.
Article em En | MEDLINE | ID: mdl-19596005
ABSTRACT
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.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Tato / Trifosfato de Adenosina / Arabidopsis / Raízes de Plantas / Proteínas Heterotriméricas de Ligação ao GTP / Proteínas de Arabidopsis Idioma: En Revista: FEBS Lett Ano de publicação: 2009 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Tato / Trifosfato de Adenosina / Arabidopsis / Raízes de Plantas / Proteínas Heterotriméricas de Ligação ao GTP / Proteínas de Arabidopsis Idioma: En Revista: FEBS Lett Ano de publicação: 2009 Tipo de documento: Article País de afiliação: Estados Unidos
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