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Stomate-based defense and environmental cues.

Shweta Panchal1, Maeli Melotto2

  • 1a Molecular Mycology Laboratory, Molecular Biology and Genetics Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore , India.

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|August 18, 2017
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Summary
This summary is machine-generated.

High humidity weakens plant stomatal defense against bacterial pathogens. Pseudomonas syringae pv. tomato (Pst) DC3000 uses coronatine to open stomata, aiding infection under favorable conditions.

Keywords:
Abiotic stressArabidopsisabscisic acidair relative humiditybacterial diseasesbiotic stressdarknesshormone balancejasmonatesalicylic acid

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Area of Science:

  • Plant pathology
  • Plant immunity
  • Environmental microbiology

Background:

  • Environmental conditions significantly influence plant immunity and disease susceptibility.
  • Bacterial pathogens often exploit environmental factors like high humidity and rain for infection.
  • Stomatal closure is a key plant defense mechanism against pathogen invasion.

Purpose of the Study:

  • To investigate how environmental conditions, specifically high humidity and darkness, affect plant stomatal defense.
  • To understand the role of coronatine from Pseudomonas syringae pv. tomato (Pst) DC3000 in overcoming stomatal defense.
  • To elucidate the interplay between plant hormone pathways and environmental cues in regulating stomatal immunity.

Main Methods:

  • Analysis of stomatal responses under varying humidity levels.
  • Investigating the impact of darkness on stomatal aperture and pathogen entry.
  • Examining the effect of coronatine on dark-closed stomata.
  • Assessing the regulation of salicylic acid and jasmonic acid pathways in guard cells.

Main Results:

  • High humidity was found to compromise stomatal defense mechanisms.
  • Regulation of salicylic acid and jasmonic acid pathways in guard cells was observed under high humidity.
  • Coronatine produced by Pst DC3000 can induce the opening of dark-closed stomata, facilitating infection.
  • Darkness promotes stomatal closure, reducing pathogen penetration, but coronatine counteracts this defense.

Conclusions:

  • High humidity suppresses plant stomatal defense, contributing to bacterial disease outbreaks.
  • Coronatine acts as an anti-stomatal defense factor, providing epidemiological advantages to Pst DC3000.
  • Environmental conditions and pathogen factors interact to determine the success of bacterial infections in plants.