R-type anion channel activation is an essential step for ROS-dependent innate immune response in Arabidopsis suspension cells - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Functional Plant Biology Year : 2009

R-type anion channel activation is an essential step for ROS-dependent innate immune response in Arabidopsis suspension cells

Jean Colcombet
  • Function : Author
Yves Mathieu
  • Function : Author
Remi Peyronnet
  • Function : Author
Nicolas Agier
  • Function : Author
Françoise Lelièvre
  • Function : Author
Hélène Barbier-Brygoo
  • Function : Author

Abstract

Plants are constantly exposed to environmental biotic and abiotic stresses. Plants cells perceive these factors and trigger early responses followed by delayed and complex adaptation processes. Using cell suspensions of Arabidopsis thaliana (L.) as a cellular model, we investigated the role of plasma membrane anion channels in Reactive Oxygen Species (ROS) production and in cell death which occurs during non-host pathogen infection. Protoplasts derived from Arabidopsis suspension cells display two anion currents with characteristics very similar to those of the slow nitrate-permeable (S-type) and rapid sulfate-permeable (R-type) channels previously characterised in hypocotyl cells and other cell types. Using seven inhibitors, we showed that the R-type channel and ROS formation in cell cultures present similar pharmacological profiles. The efficiency of anion channel blockers to inhibit ROS production was independent of the nature of the triggering signal (osmotic stress or general elicitors of plant defence), indicating that the R-type channel represents a crossroad in the signalling pathways leading to ROS production. In a second step, we show that treatment with R-type channel blockers accelerates cell death triggered by the non-specific plant pathogen Xanthomonas campestris. Finally, we discuss the hypothesis that the R-type channel is involved in innate immune response allowing cell defence via antibacterial ROS production.
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hal-04374047 , version 1 (05-01-2024)

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Jean Colcombet, Yves Mathieu, Remi Peyronnet, Nicolas Agier, Françoise Lelièvre, et al.. R-type anion channel activation is an essential step for ROS-dependent innate immune response in Arabidopsis suspension cells. Functional Plant Biology, 2009, 36 (9), pp.832. ⟨10.1071/FP09096⟩. ⟨hal-04374047⟩
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