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Water Transport in the Liana Bauhinia fassoglensis (Fabaceae)

Water Transport in the Liana Bauhinia fassoglensis (Fabaceae) Abstract To determine the efficiency of xylem conductance in the liana (woody vine) Bauhinia fassoglensis Kotschy ex Schweinf., we measured hydraulic conductance per unit stem length (measured K h), leaf-specific conductivity (LSC = K h/distal leaf area), transpiration rate (E), xylem water potential (ε), vessel number, and vessel diameter. The measured K h was 49% (se = 7%) of the predicted K h from Poiseuille's law. The mean LSC for unbranched stem segments was 1.10 × 10−8 square meters per megapascal per second (se = 0.07). LSCs were much lower (about 0.2) at branch junctions. At midday, with E at 7 × 10−8 meters per second, the measured drop in ε was about 0.08 megapascal per meter along the stems and branches and about 0.27 megapascal in going from stem to leaf. In addition, there was a drop of about 0.20 megapascal at branch junctions as predicted by E/LSC. In diurnal measurements leaf ε never dropped below about −1.2 megapascal. For long (e.g. 16 meters) stems, the predicted mid-day drop in ε through the xylem transport system might be great enough to have substantial physiological impact. 1 Supported by the National Science Foundation (grant BSR-8506370) and by an MSU All-University grant. This content is only available as a PDF. © 1989 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Physiology Oxford University Press

Water Transport in the Liana Bauhinia fassoglensis (Fabaceae)

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References (21)

Publisher
Oxford University Press
Copyright
Copyright © 2021 American Society of Plant Biologists
ISSN
0032-0889
eISSN
1532-2548
DOI
10.1104/pp.91.4.1625
Publisher site
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Abstract

Abstract To determine the efficiency of xylem conductance in the liana (woody vine) Bauhinia fassoglensis Kotschy ex Schweinf., we measured hydraulic conductance per unit stem length (measured K h), leaf-specific conductivity (LSC = K h/distal leaf area), transpiration rate (E), xylem water potential (ε), vessel number, and vessel diameter. The measured K h was 49% (se = 7%) of the predicted K h from Poiseuille's law. The mean LSC for unbranched stem segments was 1.10 × 10−8 square meters per megapascal per second (se = 0.07). LSCs were much lower (about 0.2) at branch junctions. At midday, with E at 7 × 10−8 meters per second, the measured drop in ε was about 0.08 megapascal per meter along the stems and branches and about 0.27 megapascal in going from stem to leaf. In addition, there was a drop of about 0.20 megapascal at branch junctions as predicted by E/LSC. In diurnal measurements leaf ε never dropped below about −1.2 megapascal. For long (e.g. 16 meters) stems, the predicted mid-day drop in ε through the xylem transport system might be great enough to have substantial physiological impact. 1 Supported by the National Science Foundation (grant BSR-8506370) and by an MSU All-University grant. This content is only available as a PDF. © 1989 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)

Journal

Plant Physiology – Oxford University Press

Published: Dec 1, 1989

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