Impact of Introduction of Arbuscular Mycorrhizal Fungi on the Root Microbial Community in Agricultural Fields

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  • Akyol Turgut Yigit
    Graduate School of Life Sciences, Tohoku University
  • Niwa Rieko
    Central Region Agricultural Research Center, National Agriculture and Food Research Organization (NARO)
  • Hirakawa Hideki
    Kazusa DNA Research Institute
  • Maruyama Hayato
    Graduate School of Agriculture, Hokkaido University
  • Sato Takumi
    Faculty of Agriculture, Yamagata University
  • Suzuki Takae
    Field Science Center, Graduate School of Agriculture, Tohoku University
  • Fukunaga Ayako
    Western Region Agricultural Research Center, NARO
  • Sato Takashi
    Faculty of Bioresource Sciences, Akita Prefectural University
  • Yoshida Shigenobu
    Central Region Agricultural Research Center, National Agriculture and Food Research Organization (NARO)
  • Tawaraya Keitaro
    Faculty of Agriculture, Yamagata University
  • Saito Masanori
    Field Science Center, Graduate School of Agriculture, Tohoku University Department of Innovation Research, Japan Science and Technology Agency
  • Ezawa Tatsuhiro
    Graduate School of Agriculture, Hokkaido University
  • Sato Shusei
    Graduate School of Life Sciences, Tohoku University

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Description

<p>Arbuscular mycorrhizal (AM) fungi are important members of the root microbiome and may be used as biofertilizers for sustainable agriculture. To elucidate the impact of AM fungal inoculation on indigenous root microbial communities, we used high-throughput sequencing and an analytical pipeline providing fixed operational taxonomic units (OTUs) as an output to investigate the bacterial and fungal communities of roots treated with a commercial AM fungal inoculum in six agricultural fields. AM fungal inoculation significantly influenced the root microbial community structure in all fields. Inoculation changed the abundance of indigenous AM fungi and other fungal members in a field-dependent manner. Inoculation consistently enriched several bacterial OTUs by changing the abundance of indigenous bacteria and introducing new bacteria. Some inoculum-associated bacteria closely interacted with the introduced AM fungi, some of which belonged to the genera Burkholderia, Cellulomonas, Microbacterium, Sphingomonas, and Streptomyces and may be candidate mycorrhizospheric bacteria that contribute to the establishment and/or function of the introduced AM fungi. Inoculated AM fungi also co-occurred with several indigenous bacteria with putative beneficial traits, suggesting that inoculated AM fungi may recruit specific taxa to confer better plant performance. The bacterial families Methylobacteriaceae, Acetobacteraceae, Armatimonadaceae, and Alicyclobacillaceae were consistently reduced by the inoculation, possibly due to changes in the host plant status caused by the inoculum. To the best of our knowledge, this is the first large-scale study to investigate interactions between AM fungal inoculation and indigenous root microbial communities in agricultural fields.</p>

Journal

  • Microbes and Environments

    Microbes and Environments 34 (1), 23-32, 2019

    Japanese Society of Microbial Ecology / Japanese Society of Soil Microbiology / Taiwan Society of Microbial Ecology / Japanese Society of Plant Microbe Interactions / Japanese Society for Extremophiles

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