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Root anatomy governs bi-directional resource transfer in mycorrhizal symbiosis

Author

Listed:
  • Jingjing Cao

    (Henan Agricultural University)

  • Junjian Wang

    (Southern University of Science and Technology
    Southern University of Science and Technology
    Southern University of Science and Technology)

  • Qingpei Yang

    (Henan Agricultural University)

  • Binglin Guo

    (Henan Agricultural University)

  • Tino Colombi

    (University of Nottingham
    Swedish University of Agricultural Sciences)

  • Oscar J. Valverde-Barrantes

    (Florida International University)

  • Junxiang Ding

    (Zhengzhou University)

  • Yue Zhang

    (Henan Agricultural University)

  • Huifang Wu

    (Henan Agricultural University)

  • Zhipei Feng

    (Henan Agricultural University)

  • Xitian Yang

    (Henan Agricultural University)

  • Deliang Kong

    (Henan Agricultural University)

Abstract

Plants form mycorrhizal symbioses to enhance nutrient acquisition, yet the biophysical principles governing carbon and nutrient exchange remain unclear. Here, we develop a theory of bi-directional carbon–nutrient transfer that integrates root anatomy, energetic costs, and mycorrhizal positioning. We show that nutrient uptake per unit carbon or energy investment declines with increasing root diameter due to higher carbon demands across thicker cortical tissues. Mycorrhizal fungi mitigate this constraint by enabling more carbon-efficient nutrient uptake, particularly when arbuscules are positioned in inner cortical layers. This spatial optimization minimizes the carbon cost of transporting nutrients to the stele. Our framework reconciles anatomical variation, symbiotic structure, and functional efficiency across root types and mycorrhizal strategies and offers a new lens for understanding the coevolution between roots and mycorrhizal fungi.

Suggested Citation

  • Jingjing Cao & Junjian Wang & Qingpei Yang & Binglin Guo & Tino Colombi & Oscar J. Valverde-Barrantes & Junxiang Ding & Yue Zhang & Huifang Wu & Zhipei Feng & Xitian Yang & Deliang Kong, 2025. "Root anatomy governs bi-directional resource transfer in mycorrhizal symbiosis," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-64553-1
    DOI: 10.1038/s41467-025-64553-1
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