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Auxin-producing bacteria promote barley rhizosheath formation

Author

Listed:
  • Feiyun Xu

    (Fujian Agriculture and Forestry University)

  • Hanpeng Liao

    (Fujian Agriculture and Forestry University)

  • Jinyong Yang

    (Fujian Agriculture and Forestry University)

  • Yingjiao Zhang

    (Fujian Agriculture and Forestry University
    Minjiang University)

  • Peng Yu

    (University of Bonn
    University of Bonn)

  • Yiying Cao

    (Fujian Agriculture and Forestry University)

  • Ju Fang

    (Fujian Agriculture and Forestry University)

  • Shu Chen

    (Fujian Agriculture and Forestry University)

  • Liang Li

    (Fujian Agriculture and Forestry University)

  • Leyun Sun

    (Fujian Agriculture and Forestry University)

  • Chongxuan Du

    (Fujian Agriculture and Forestry University)

  • Ke Wang

    (Fujian Agriculture and Forestry University)

  • Xiaolin Dang

    (Fujian Agriculture and Forestry University)

  • Zhiwei Feng

    (Fujian Agriculture and Forestry University)

  • Yifan Cao

    (Yangzhou University)

  • Ying Li

    (Yangzhou University)

  • Jianhua Zhang

    (The Chinese University of Hong Kong)

  • Weifeng Xu

    (Fujian Agriculture and Forestry University)

Abstract

The rhizosheath, or the layer of soil closely adhering to roots, can help plants to tolerate drought under moderate soil drying conditions. Rhizosheath formation is the result of poorly understood interactions between root exudates, microbes, and soil conditions. Here, we study the roles played by the soil microbiota in rhizosheath formation in barley (a dry crop). We show that barley rhizosheath formation is greater in acid soil than in alkaline soil, and inoculation with microbiota from acid soil enhances rhizosheath formation in alkaline soil. The rhizosheath-promoting activity is associated with the presence of Flavobacteriaceae and Paenibacillaceae bacteria that express genes for biosynthesis of indole-3-acetic acid (IAA, a common auxin), as determined by metagenomics and metatranscriptomics. Two bacterial strains isolated from rhizosheath (Chryseobacterium culicis and Paenibacillus polymyxa) produce IAA and enhance barley rhizosheath formation, while their IAA-defective mutants are unable to promote rhizosheath formation. Co-inoculation with the IAA-producing strains enhances barley grain yield in field experiments through an increase in spike number. Our findings contribute to our understanding of barley rhizosheath formation, and suggest potential strategies for crop improvement.

Suggested Citation

  • Feiyun Xu & Hanpeng Liao & Jinyong Yang & Yingjiao Zhang & Peng Yu & Yiying Cao & Ju Fang & Shu Chen & Liang Li & Leyun Sun & Chongxuan Du & Ke Wang & Xiaolin Dang & Zhiwei Feng & Yifan Cao & Ying Li , 2023. "Auxin-producing bacteria promote barley rhizosheath formation," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40916-4
    DOI: 10.1038/s41467-023-40916-4
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    1. Javier Martínez Pacheco & Philippe Ranocha & Luciana Kasulin & Corina M. Fusari & Lucas Servi & Ariel. A. Aptekmann & Victoria Berdion Gabarain & Juan Manuel Peralta & Cecilia Borassi & Eliana Marzol , 2022. "Apoplastic class III peroxidases PRX62 and PRX69 promote Arabidopsis root hair growth at low temperature," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    2. Davide Bulgarelli & Matthias Rott & Klaus Schlaeppi & Emiel Ver Loren van Themaat & Nahal Ahmadinejad & Federica Assenza & Philipp Rauf & Bruno Huettel & Richard Reinhardt & Elmon Schmelzer & Joerg Pe, 2012. "Revealing structure and assembly cues for Arabidopsis root-inhabiting bacterial microbiota," Nature, Nature, vol. 488(7409), pages 91-95, August.
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    1. Mingxing Wang & An-Hui Ge & Xingzhu Ma & Xiaolin Wang & Qiujin Xie & Like Wang & Xianwei Song & Mengchen Jiang & Weibing Yang & Jeremy D. Murray & Yayu Wang & Huan Liu & Xiaofeng Cao & Ertao Wang, 2024. "Dynamic root microbiome sustains soybean productivity under unbalanced fertilization," Nature Communications, Nature, vol. 15(1), pages 1-15, December.

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