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A Hydroponic Co-cultivation System for Simultaneous and Systematic Analysis of Plant/Microbe Molecular Interactions and Signaling
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Plants under attack: multiple interactions with insects and microbes.

Martin De Vos1, Vivian R Van Oosten, Georg Jander

  • 1Plant-Microbe Interactions; Institute of Environmental Biology; Department of Biology; Faculty of Science; Utrecht University; Utrecht, The Netherlands.

Plant Signaling & Behavior
|August 26, 2009
PubMed
Summary
This summary is machine-generated.

Plant defenses against pests are specific. Aphid feeding does not trigger resistance against pathogens, but pathogen-induced resistance can reduce aphid reproduction, revealing complex plant-insect-microbe interactions.

Keywords:
ArabidopsisMyzus persicaedefense signalinginduced resistance

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Published on: October 1, 2015

Area of Science:

  • Plant immunity
  • Plant-insect interactions
  • Plant-microbe interactions

Background:

  • Plants activate inducible defenses against specific attackers.
  • Insect herbivores and microbial pathogens can induce overlapping defense pathways, potentially causing cross-resistance.
  • Previous studies showed chewing insects induce resistance against pathogens in Arabidopsis thaliana.

Purpose of the Study:

  • To investigate the effectiveness of plant defenses triggered by phloem-feeding aphids (Myzus persicae).
  • To determine if aphid infestation confers resistance against subsequent microbial pathogen attacks (Pseudomonas syringae pv. tomato, Xanthomonas campestris pv. armoraciae, turnip crinkle virus).
  • To assess the sensitivity of aphids to plant resistance previously induced by beneficial rhizobacteria or pathogens.

Main Methods:

  • Arabidopsis thaliana infestation with Myzus persicae.
  • Assessing Myzus persicae reproduction after conspecific feeding.
  • Challenging aphid-infested plants with microbial pathogens (Pst, Xca, TCV).
  • Evaluating the effect of induced systemic resistance (ISR) and systemic acquired resistance (SAR) on aphid reproduction and pathogen susceptibility.

Main Results:

  • Myzus persicae reproduction was unaffected by prior aphid feeding.
  • Aphid-induced resistance was ineffective against subsequent bacterial or viral pathogen attacks.
  • Induced systemic resistance (ISR) by Pseudomonas fluorescens did not affect Myzus persicae.
  • Systemic acquired resistance (SAR) induced by Pseudomonas syringae pv. tomato reduced aphid reproduction.

Conclusions:

  • Plant defense responses to different attackers, like chewing insects versus phloem-feeding aphids, are distinct.
  • Aphid feeding does not generally prime plants for defense against microbial pathogens.
  • Pathogen-induced resistance (SAR) can impact phloem-feeding insects, suggesting complex multitrophic interactions in plant defense.