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Reduction of rare soil microbes modifies plant–herbivore interactions

Authors

  • W. H. Gera Hol,

    Corresponding author
    1. Netherlands Institute of Ecology (NIOO-KNAW), Department of Terrestrial Ecology, Boterhoeksestraat 48, 6666 GA Heteren, The Netherlands
      *Correspondence: E-mail: g.hol@nioo.knaw.nl
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  • Wietse De Boer,

    1. Netherlands Institute of Ecology (NIOO-KNAW), Department of Microbial Ecology, Boterhoeksestraat 48, 6666 GA Heteren, The Netherlands
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  • Aad J. Termorshuizen,

    1. Blgg, Nieuwe Kanaal 7F, NL-6709 PA Wageningen, The Netherlands
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  • Katrin M. Meyer,

    1. Göttingen University, Ecosystem Modelling, D-37077 Göttingen, Germany
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  • Johannes H. M. Schneider,

    1. IRS Inst Sugar Beet Res, POB 32, NL-4600 AA Bergen Op Zoom, The Netherlands
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  • Nicole M. Van Dam,

    1. Netherlands Institute of Ecology (NIOO-KNAW), Department of Terrestrial Ecology, Boterhoeksestraat 48, 6666 GA Heteren, The Netherlands
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  • Johannes A. Van Veen,

    1. Netherlands Institute of Ecology (NIOO-KNAW), Department of Microbial Ecology, Boterhoeksestraat 48, 6666 GA Heteren, The Netherlands
    2. Leiden University, Institute of Biology, NL-2300 RA Leiden, The Netherlands
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  • Wim H. Van Der Putten

    1. Netherlands Institute of Ecology (NIOO-KNAW), Department of Terrestrial Ecology, Boterhoeksestraat 48, 6666 GA Heteren, The Netherlands
    2. Wageningen University, Laboratory of Nematology, NL-6709 PD Wageningen, The Netherlands
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*Correspondence: E-mail: g.hol@nioo.knaw.nl

Abstract

Ecology Letters (2010) 13: 292–301

Abstract

Rare species are assumed to have little impact on community interactions and ecosystem processes. However, very few studies have actually attempted to quantify the role of rare species in ecosystems. Here we compare effects of soil community assemblages on plant-herbivore interactions and show that reduction of rare soil microbes increases both plant biomass and plant nutritional quality. Two crop plant species growing in soil where rare microbes were reduced, had tissues of higher nutritional quality, which theoretically makes them more susceptible to pest organisms such as shoot-feeding aphids and root-feeding nematodes. Reduction of rare microbes increased aphid body size in the absence of nematodes; nematodes always reduced aphid body size independent of the soil microbial community. This study is the first to show that rare soil microbes are not redundant but may play a role in crop protection by enhancing aboveground and belowground plant defence. It remains to be tested whether these are direct effects of rare soil microbes on plants and herbivores, or indirect effects via shifts in the microbial soil community assemblages.

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