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Tytuł:
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Heat girdling does not affect xylem integrity: an in vivo magnetic resonance imaging study in the tomato peduncle.
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Autorzy:
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Van de Wal BAE; Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium.
Windt CW; IBG-2: Plant Sciences, Institute of Bio- and Geosciences, Forschungszentrum Jülich, Wilhelm-Johnen-Straβe, D-52428, Jülich, Germany.
Leroux O; Department of Biology, Faculty of Sciences, Ghent University, K L Ledeganckstraat 35, B-9000, Ghent, Belgium.
Steppe K; Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium.
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Źródło:
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The New phytologist [New Phytol] 2017 Jul; Vol. 215 (2), pp. 558-568. Date of Electronic Publication: 2017 May 22.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: Oxford : Wiley on behalf of New Phytologist Trust
Original Publication: London, New York [etc.] Academic Press.
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MeSH Terms:
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Solanum lycopersicum/*physiology
Magnetic Resonance Imaging/*methods
Xylem/*physiology
Hot Temperature ; Phloem/physiology ; Rheology ; Water
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Contributed Indexing:
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Keywords: Solanum lycopersicum; anatomy; flow imaging; fruit growth; heat girdling; nuclear magnetic resonance (NMR); phloem flow; xylem flow
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Substance Nomenclature:
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059QF0KO0R (Water)
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Entry Date(s):
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Date Created: 20170526 Date Completed: 20180411 Latest Revision: 20221207
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Update Code:
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20240105
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DOI:
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10.1111/nph.14610
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PMID:
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28543545
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Heat girdling is a method to estimate the relative contribution of phloem vs xylem water flow to fruit growth. The heat girdling process is assumed to destroy all living tissues, including the phloem, without affecting xylem conductivity. However, to date, the assumption that xylem is not affected by heat girdling remains unproven. In this study, we used in vivo magnetic resonance imaging (MRI) velocimetry to test if heat girdling can cause xylem vessels to embolize or affect xylem water flow characteristics in the peduncle of tomato (Solanum lycopersicum cv Dirk). Anatomical and MRI data indicated that, at the site of girdling, all living tissues were disrupted, but that the functionality of the xylem remained unchanged. MRI velocimetry showed that the volume flow through the secondary xylem was not impeded by heat girdling in either the short or the long term (up to 91 h after girdling). This study provides support for the hypothesis that in the tomato peduncle the integrity and functionality of the xylem remain unaffected by heat girdling. It therefore confirms the validity of the heat girdling technique as a means to estimate relative contributions of xylem and phloem water flow to fruit growth.
(© 2017 The Authors. New Phytologist © 2017 New Phytologist Trust.)
