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Aridity modulates belowground bacterial community dynamics in olive tree.

Ramona Marasco1, Marco Fusi2, Eleonora Rolli3

  • 1Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.

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Aridity shapes plant-associated bacterial communities, favoring distinct groups of "aridity-winners" and "aridity-losers." These shifts impact microbial interactions and plant health under changing climates.

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Area of Science:

  • Microbiology
  • Plant Science
  • Ecology

Background:

  • Increasing aridity due to climate change impacts soil microbial communities and ecosystem services.
  • Understanding plant-associated microbial responses to aridity is crucial for predicting vegetation productivity and biotic interactions.
  • Edaphic microbial diversity and abundance are negatively affected by arid conditions.

Purpose of the Study:

  • To investigate the effects of increasing aridity on the diversity and co-occurrence of bacterial communities associated with olive tree roots and bulk soil.
  • To determine how plant root systems selectively influence bacterial communities under varying levels of aridity.
  • To identify bacterial groups that thrive or decline with increasing aridity and their functional roles.

Main Methods:

  • Sampling of bulk soil and root-associated bacteria from olive trees across a gradient of arid regions in Tunisia (high, middle, low aridity).
  • Analysis of bacterial community diversity and structure using molecular techniques.
  • Investigation of bacterial co-occurrence networks and the identification of distinct microbial modules.

Main Results:

  • Aridity significantly amplifies the selective pressure exerted by the plant root system on bacterial communities.
  • Distinct bacterial communities were identified, characterized by 'aridity-winner' and 'aridity-loser' bacteria, correlated with annual rainfall.
  • Aridity regulated bacterial co-occurrence, forming modules enriched with either aridity-winners or aridity-losers, including bacteria with plant growth-promoting functions.

Conclusions:

  • Plant root systems play a key role in assembling bacterial communities that are adapted to arid conditions.
  • Aridity-induced shifts in bacterial communities and their interactions can affect the resilience of the plant holobiont.
  • Findings offer insights into microbial adaptation strategies and their implications for plant health under climate change.