Increased anion channel activity is an unavoidable event in ozone-induced programmed cell death.

<h4>Background</h4>Ozone is a major secondary air pollutant often reaching high concentrations in urban areas under strong daylight, high temperature and stagnant high-pressure systems. Ozone in the troposphere is a pollutant that is harmful to the plant.<h4>Principal findings</...

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Autores principales: Takashi Kadono, Daniel Tran, Rafik Errakhi, Takuya Hiramatsu, Patrice Meimoun, Joël Briand, Mari Iwaya-Inoue, Tomonori Kawano, François Bouteau
Formato: article
Lenguaje:EN
Publicado: Public Library of Science (PLoS) 2010
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Acceso en línea:https://doaj.org/article/05605942f3a54387ab022b8ce9fdb905
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Sumario:<h4>Background</h4>Ozone is a major secondary air pollutant often reaching high concentrations in urban areas under strong daylight, high temperature and stagnant high-pressure systems. Ozone in the troposphere is a pollutant that is harmful to the plant.<h4>Principal findings</h4>By exposing cells to a strong pulse of ozonized air, an acute cell death was observed in suspension cells of Arabidopsis thaliana used as a model. We demonstrated that O(3) treatment induced the activation of a plasma membrane anion channel that is an early prerequisite of O(3)-induced cell death in A. thaliana. Our data further suggest interplay of anion channel activation with well known plant responses to O(3), Ca(2+) influx and NADPH-oxidase generated reactive oxygen species (ROS) in mediating the oxidative cell death. This interplay might be fuelled by several mechanisms in addition to the direct ROS generation by O(3); namely, H(2)O(2) generation by salicylic and abscisic acids. Anion channel activation was also shown to promote the accumulation of transcripts encoding vacuolar processing enzymes, a family of proteases previously reported to contribute to the disruption of vacuole integrity observed during programmed cell death.<h4>Significance</h4>Collectively, our data indicate that anion efflux is an early key component of morphological and biochemical events leading to O(3)-induced programmed cell death. Because ion channels and more specifically anion channels assume a crucial position in cells, an understanding about the underlying role(s) for ion channels in the signalling pathway leading to programmed cell death is a subject that warrants future investigation.