Revealing catastrophic failure of leaf networks under stress
Identifieur interne : 001800 ( Main/Exploration ); précédent : 001799; suivant : 001801Revealing catastrophic failure of leaf networks under stress
Auteurs : Timothy J. Brodribb [Australie] ; Diane Bienaimé [France] ; Philippe Marmottant [Australie, France]Source :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2016.
Descripteurs français
- KwdFr :
- MESH :
- métabolisme : Eau.
- physiologie : Angiospermes, Faisceau vasculaire des plantes, Feuilles de plante, Fougères, Stress physiologique.
- Air, Microfluidique, Spécificité d'espèce, Sécheresses, Transpiration des plantes.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Water.
- physiology : Angiosperms, Ferns, Plant Leaves, Plant Vascular Bundle, Stress, Physiological.
- Air, Droughts, Microfluidics, Plant Transpiration, Species Specificity.
Abstract
Water sustains photosynthesis and growth of land plants, but it must be transported from the soil to leaves under high tension. Drying soil leads to an increase in water tension, exposing plants to the problem of breakage of the water column, causing embolisms that cut off water supply, leading to tissue death during drought. The ability of leaves to resist embolism formation is a key adaptive axis in plant evolution, and yet the process itself has never been visualized in the leaf venation. We describe a new optical method that allows the evolution and spread of embolism in the entire leaf network to be mapped, thus revealing general rules in the sequence of leaf vein transport failure.
Url:
DOI: 10.1073/pnas.1522569113
PubMed: 27071104
PubMed Central: 4855591
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><title>Significance</title>
<p>Water sustains photosynthesis and growth of land plants, but it must be transported from the soil to leaves under high tension. Drying soil leads to an increase in water tension, exposing plants to the problem of breakage of the water column, causing embolisms that cut off water supply, leading to tissue death during drought. The ability of leaves to resist embolism formation is a key adaptive axis in plant evolution, and yet the process itself has never been visualized in the leaf venation. We describe a new optical method that allows the evolution and spread of embolism in the entire leaf network to be mapped, thus revealing general rules in the sequence of leaf vein transport failure.</p>
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