Root traits and belowground herbivores relate to plant–soil feedback variation among congeners

Rutger A. Wilschut (), Wim H. Putten, Paolina Garbeva, Paula Harkes, Wouter Konings, Purva Kulkarni, Henk Martens and Stefan Geisen
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Rutger A. Wilschut: Wageningen University
Wim H. Putten: Wageningen University
Paolina Garbeva: Netherlands Institute of Ecology
Paula Harkes: Netherlands Institute of Ecology
Wouter Konings: Wageningen University
Purva Kulkarni: Netherlands Institute of Ecology
Henk Martens: Wageningen University
Stefan Geisen: Wageningen University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Plant–soil feedbacks contribute to vegetation dynamics by species-specific interactions between plants and soil biota. Variation in plant–soil feedbacks can be predicted by root traits, successional position, and plant nativeness. However, it is unknown whether closely related plant species develop more similar plant–soil feedbacks than more distantly related species. Where previous comparisons included plant species from distant phylogenetic positions, we studied plant–soil feedbacks of congeneric species. Using eight intra-continentally range-expanding and native Geranium species, we tested relations between phylogenetic distances, chemical and structural root traits, root microbiomes, and plant–soil feedbacks. We show that root chemistry and specific root length better predict bacterial and fungal community composition than phylogenetic distance. Negative plant–soil feedback strength correlates with root-feeding nematode numbers, whereas microbiome dissimilarity, nativeness, or phylogeny does not predict plant–soil feedbacks. We conclude that root microbiome variation among congeners is best explained by root traits, and that root-feeding nematode abundances predict plant–soil feedbacks.

Date: 2019
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DOI: 10.1038/s41467-019-09615-x

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