Grapevine stomata and the elicitor-induced protection against downy mildew

 

 

Are Grapevine Stomata Involved in the Elicitor-Induced Protection Against Downy Mildew?

by Allègre M., Héloir M.-C., Trouvelot S., Daire X., Pugin A., Wendehenne D., Marielle Adrian M. (2009)

Mathilde Allègre, Marie-Claire Héloir, Sophie Trouvelot, Xavier Daire, Alain Pugin, D. Wendehenne, Marielle Adrian,

Unité Mixte de Recherche INRA 1088/CNRS 5184/ Université de Bourgogne Plante-Microbe-Environnement, 17 rue Sully, BP 86510, 21065 Dijon cedex, France

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in Molecular plant-microbe interactions 22(8): 977-986 – https://doi.org/10.1094/MPMI-22-8-0977 –

https://apsjournals.apsnet.org/doi/abs/10.1094/MPMI-22-8-0977

Stomata, natural pores bordered by guard cells, regulate transpiration and gas exchanges between plant leaves and the atmosphere. These natural openings also constitute a way of penetration for microorganisms.

In plants, the perception of potentially pathogenic microorganisms or elicitors of defense reactions induces a cascade of events, including H₂O₂ production, that allows the activation of defense genes, leading to defense reactions.

Similar signaling events occur in guard cells in response to the perception of abscisic acid (ABA), leading to stomatal closure. Moreover, few elicitors were reported to induce stomatal closure in Arabidopsis and Vicia faba leaves.

Because responses to ABA and elicitors share common signaling events, it led us to question whether stomatal movements and H₂O₂ production in guard cells could play a key role in elicitor-induced protection against pathogens that use stomata for infection.

This study was performed using the grapevine–Plasmopara viticola pathosystem. Using epidermal peels, we showed that, as for ABA, the elicitor-induced stomatal closure is mediated by reactive oxygen species (ROS) production in guard cells.

In plants, we observed that the protection against downy mildew induced by some elicitors is probably not due only to effects on stomatal movements or to a guard-cell-specific activation of ROS production.

 

Stomata and the Elicitor-Induced Protection Against Downy Mildew

Are Grapevine Stomata Involved in the Elicitor-Induced Protection Against Downy Mildew?

Allègre M., Héloir M.-C., Trouvelot S., Daire X., Pugin A., Wendehenne D., Adrian M. (2009)

Mathilde Allègre, Marie-Claire Héloir, Sophie Trouvelot, Xavier Daire, Alain Pugin, D. Wendehenne, Marielle Adrian,

Unité Mixte de Recherche INRA 1088/CNRS 5184/ Université de Bourgogne Plante-Microbe-Environnement, 17 rue Sully, BP 86510, 21065 Dijon cedex, France

MPMI 22(8): 977–986. – doi:10.1094/ MPMI -22-8-0977 –

http://apsjournals.apsnet.org/doi/pdf/10.1094/MPMI-22-8-0977

Stomata, natural pores bordered by guard cells, regulate transpiration and gas exchanges between plant leaves and the atmosphere. These natural openings also constitute a way of penetration for microorganisms.

In plants, the perception of potentially pathogenic microorganisms or elicitors of defense reactions induces a cascade of events, including H2O2 production, that allows the activation of defense genes, leading to defense reactions.

Similar signaling events occur in guard cells in response to the perception of abscisic acid (ABA), leading to stomatal closure.

Moreover, few elicitors were reported to induce stomatal closure in Arabidopsis and Vicia faba leaves. Because responses to ABA and elicitors share common signaling events, it led us to question whether stomatal movements and H2O2 production in guard cells could play a key role in elicitor-induced protection against pathogens that use stomata for infection.

This study was performed using the grapevine– Plasmopara viticola pathosystem. Using epidermal peels, we showed that, as for ABA, the elicitor-induced stomatal closure is mediated by reactive oxygen species (ROS) production in guard cells.

In plants, we observed that the protection against downy mildew induced by some elicitors is probably not due only to effects on stomatal movements or to a guard-cell-specific activation of ROS production.

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