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Species-specific root microbiota dynamics in response to plant-available phosphorus

Bodenhausen, Natacha; Somerville, Vincent; Desirò, Alessandro; Walser, Jean-Claude; Borghi, Lorenzo; van der Heijden, Marcel G. A. and Schlaeppi, Klaus (2018) Species-specific root microbiota dynamics in response to plant-available phosphorus. bioRxiv (400119), xx -xx.

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Document available online at: https://www.biorxiv.org/content/10.1101/400119v1


Phosphorus (P) is a limiting element for plant growth. Several root microbes, including arbuscular mycorrhizal fungi (AMF), have the capacity to improve plant nutrition and their abundance is known to depend on P fertility. However, how complex root-associated bacterial and fungal communities respond to changes in P availability remains ill-defined. We manipulated the availability of soil P in pots and compared the root microbiota of non-mycorrhizal Arabidopsis with mycorrhizal Petunia plants. Root bacteria and fungi were profiled using ribosomal operon gene fragment sequencing, we searched for P sensitive microbes and tested whether a P sensitive core microbiome could be identified. Root microbiota composition varied substantially by P availability. A P sensitive core microbiome was not identified as different bacterial and fungal groups responded to low-P conditions in Arabidopsis and Petunia. P sensitive microbes included Mortierellomycotina in Arabidopsis, while these were AMF and their symbiotic endobacteria in Petunia. Of note, their P-dependent root colonization was reliably quantified by sequencing. The species-specific root microbiota dynamics suggest that Arabidopsis and Petunia evolved different microbial associations under the selection pressure of low P availability. This implies that the development of microbial products that improve P availability requires the consideration of host-species specificity.

EPrint Type:Journal paper
Keywords:Arabidopsis thaliana, arbuscular mycorrhizal fungi (AMF), endobacteria, Petunia hybrida, phosphate, root microbiota, soil sciences, soil fertility
Subjects: Soil > Soil quality
Crop husbandry
Research affiliation: Switzerland > Agroscope
Switzerland > ETHZ - Agrarwissenschaften
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil
Switzerland > Zürich University
USA > Other organizations
Switzerland > Other organizations
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:34930
Deposited On:08 Mar 2019 11:04
Last Modified:06 Jan 2021 15:24
Document Language:English
Refereed:Not peer-reviewed

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