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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Nematode Predation and Competitive Interactions Affect Microbe-Mediated Phosphorus Dynamics.

Jie Zheng1, Francisco Dini-Andreote2,3, Lu Luan1

  • 1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciencesgrid.9227.e, Nanjing, China.

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Summary

Nematode predation shapes soil microbes, increasing phosphorus availability. This study reveals how predator-prey dynamics and competition among bacteria enhance soil nutrient cycling and plant productivity.

Keywords:
ALP activityALP-producing bacteriacompetitionkeystone taxanematode predationphosphorus availability

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Area of Science:

  • Soil Ecology
  • Microbial Ecology
  • Nutrient Cycling

Background:

  • Rhizosphere microbiome composition is crucial for soil nutrient balance and cycling.
  • The impact of nematode predation on soil phosphorus (P) mineralization rates remains poorly understood.
  • Understanding these interactions is key to improving soil health and plant nutrition.

Purpose of the Study:

  • To investigate the role of nematode predation in influencing soil phosphorus (P) availability and cycling.
  • To examine how nematode predation affects the alkaline phosphomonoesterase (ALP)-producing bacterial community and ALP activity in rapeseed rhizosphere.
  • To elucidate the mechanisms of microbially mediated competitive interactions induced by nematode predation.

Main Methods:

  • Conducted a 7-year field experiment with varying fertilizer treatments.
  • Monitored changes in ALP-producing bacterial communities and ALP activity.
  • Utilized co-occurrence network analysis, metabolomics, and structural equation modeling.

Main Results:

  • Nematode addition increased predation pressure, altering the abundance and composition of ALP-producing bacteria.
  • Nematode predation induced competitive interactions between keystone bacteria and other community members.
  • Increased nematode predation was linked to higher ALP-producing bacterial diversity, enhanced ALP activity, and greater P availability.

Conclusions:

  • Nematode predation significantly influences soil microbial communities and nutrient cycling dynamics.
  • Predator-prey and competitive interactions mediated by nematodes enhance soil P availability.
  • Findings offer novel insights into microbially driven mechanisms for improving soil phosphorus availability in plant rhizospheres.