Root anatomy governs bi-directional resource transfer in mycorrhizal symbiosis

Jingjing Cao, Junjian Wang, Qingpei Yang, Binglin Guo, Tino Colombi, Oscar J. Valverde-Barrantes, Junxiang Ding, Yue Zhang, Huifang Wu, Zhipei Feng, Xitian Yang and Deliang Kong ()
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Jingjing Cao: Henan Agricultural University
Junjian Wang: Southern University of Science and Technology
Qingpei Yang: Henan Agricultural University
Binglin Guo: Henan Agricultural University
Tino Colombi: University of Nottingham
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

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-64553-1

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