Leaf vein xylem conduit diameter influences susceptibility to embolism and hydraulic decline

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  • Christine Scoffoni
    Department of Ecology and Evolutionary Biology University of California Los Angeles 621 Charles E. Young Drive South Los Angeles CA 90095 USA
  • Caetano Albuquerque
    Department of Viticulture and Enology University of California Davis CA 95616 USA
  • Craig R. Brodersen
    School of Forestry & Environmental Studies Yale University 195 Prospect Street New Haven CT 06511 USA
  • Shatara V. Townes
    Department of Ecology and Evolutionary Biology University of California Los Angeles 621 Charles E. Young Drive South Los Angeles CA 90095 USA
  • Grace P. John
    Department of Ecology and Evolutionary Biology University of California Los Angeles 621 Charles E. Young Drive South Los Angeles CA 90095 USA
  • Hervé Cochard
    PIAF INRA Univ. Clermont‐Auvergne Clermont‐Ferrand 63100 France
  • Thomas N. Buckley
    Plant Breeding Institute Faculty of Agriculture and Environment The University of Sydney 12656 Newell Hwy Narrabri NSW 2390 Australia
  • Andrew J. McElrone
    Department of Viticulture and Enology University of California Davis CA 95616 USA
  • Lawren Sack
    Department of Ecology and Evolutionary Biology University of California Los Angeles 621 Charles E. Young Drive South Los Angeles CA 90095 USA

書誌事項

公開日
2016-11-11
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
  • http://doi.wiley.com/10.1002/tdm_license_1.1
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/nph.14256
公開者
Wiley

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説明

<jats:title>Summary</jats:title><jats:p> <jats:list list-type="bullet"> <jats:list-item><jats:p>Ecosystems worldwide are facing increasingly severe and prolonged droughts during which hydraulic failure from drought‐induced embolism can lead to organ or whole plant death. Understanding the determinants of xylem failure across species is especially critical in leaves, the engines of plant growth.</jats:p></jats:list-item> <jats:list-item><jats:p>If the vulnerability segmentation hypothesis holds within leaves, higher order veins that are most terminal in the plant hydraulic system should be more susceptible to embolism to protect the rest of the water transport system. Increased vulnerability in the higher order veins would also be consistent with these experiencing the greatest tensions in the plant xylem network.</jats:p></jats:list-item> <jats:list-item><jats:p>To test this hypothesis, we combined X‐ray micro‐computed tomography imaging, hydraulic experiments, cross‐sectional anatomy and 3D physiological modelling to investigate how embolisms spread throughout petioles and vein orders during leaf dehydration in relation to conduit dimensions.</jats:p></jats:list-item> <jats:list-item><jats:p>Decline of leaf xylem hydraulic conductance (<jats:italic>K</jats:italic><jats:sub>x</jats:sub>) during dehydration was driven by embolism initiating in petioles and midribs across all species, and <jats:italic>K</jats:italic><jats:sub>x</jats:sub> vulnerability was strongly correlated with petiole and midrib conduit dimensions. Our simulations showed no significant impact of conduit collapse on <jats:italic>K</jats:italic><jats:sub>x</jats:sub> decline. We found xylem conduit dimensions play a major role in determining the susceptibility of the leaf water transport system during strong leaf dehydration.</jats:p></jats:list-item> </jats:list> </jats:p>

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