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Zero-calorie sugar delivery to roots

Nature Plantsvolume 3pages922923 (2017) | Download Citation


Resistance to moving sugars from foliage to roots is high in trees, suggesting that the transport mechanism found in herbs might not work in trees. Now with new measurements of phloem structure and leaf turgor pressure, it has been shown that the Münch pressure-flow hypothesis can also explain sugar transport in tall trees.

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Author information


  1. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO, USA

    • Michael G. Ryan
  2. CREAF, Barcelona, Spain

    • Elisabeth M. R. Robert
  3. FWO, Brussels, Belgium

    • Elisabeth M. R. Robert


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Competing interests

The authors declare no competing financial interests.

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Correspondence to Michael G. Ryan.

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