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Characterization of forest soil bacteria isolated at the microhabitat level and of their interactions with Poplar

Abstract : Soil borne microbes are vital contributors to forest ecosystems through soil services such as organic matter decomposition, nutrient cycling and sustaining plant growth. Bacteria and fungi form complex networks of interactions belowground interconnected with roots and assisting plants with water, nutrients, and some can help overcome pathogenic damages. During these biotic interactions, there is an exchange of signal molecules and metabolites that modify the local environment and can affect the presence and growth of surrounding microbial neighbours. These alterations are key processes in the structuration of soil microbial communities and plant development. In soil, abiotic and biotic factors such as pH, organic matter and vegetation have been extensively studied to govern microbial communities’ structure. However, some important biotic interactions are still poorly described. Especially molecules produced during bacterial interactions that affect microbial communities’ structure and plant health and growth are still underexplored. To obtain insights of the impact of these interactions, we focused on bacteria that share a habitat with the same abiotic and biotic conditions and that are likely interacting. In order to reach this goal, we isolated bacteria from different grains of soil, described their functional abilities, evaluated the behaviours against each other and their impact on the growth of Populus. In this study, bacteria from a grain of soil had a high functional diversity where few bacteria were interacting. Most interactions were antagonistic and few were strong inhibitions. Moreover, most bacteria altered the root architecture of Populus, and interestingly one Streptomyces strain was able to cause necrosis in the root system.
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Submitted on : Monday, March 21, 2022 - 2:04:45 PM
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  • HAL Id : tel-02516728, version 1


Milena Gonzalo. Characterization of forest soil bacteria isolated at the microhabitat level and of their interactions with Poplar. Microbiology and Parasitology. Université de Lorraine, 2019. English. ⟨NNT : 2019LORR0294⟩. ⟨tel-02516728⟩



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