Abstract
The importance of microorganisms in plant development, nutrition, and stress resistance is unquestioned and has led to a more holistic approach of plant-microbe interactions, under the holobiont concept. The structure of the plant microbiota is often described as host driven, especially in the rhizosphere, where microbial communities are shaped by diverse rhizodeposits. Gradually, this anthropogenic vision is fading and being replaced by the idea that plants and microorganisms co-shape the plant microbiota. Through coevolution, plants and microbes have developed cross-kingdom communication channels. Here, we propose that miRNAs are crucial mediators of plant-microbe interactions and microbiota shaping in the rhizosphere. Moreover, we suggest, as an alternative to generally unsuccessful strategies based on microbial inoculants, miRNAs as a promising tool for novel holobiont engineering.
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