Magnetic resonance imaging suggests functional role of previous year vessels and fibres in ring-porous sap flow resumption

Autor:	Edo Gerkema, Paul Copini, Frank J. Vergeldt, Ute Sass-Klaassen, Jan den Ouden, Henk Van As, Carel W. Windt, Patrick Fonti, Mathieu Decuyper, Frank J. Sterck
Rok vydání:	2019
Předmět:	cambial activity Physiology Water flow Bos- en Landschapsecologie water flow Flow (psychology) Biophysics Plant Science Quercus robur L phenology Quercus Laboratory of Geo-information Science and Remote Sensing Parenchyma medicine Forest and Landscape Ecology Bosecologie en Bosbeheer Laboratorium voor Geo-informatiekunde en Remote Sensing Pedunculate Porosity Water content Vegetatie Leaf formation water content Vegetation medicine.diagnostic_test Chemistry earlywood vessel formation Water Magnetic resonance imaging PE&RC Magnetic Resonance Imaging Wood Forest Ecology and Forest Management Biofysica Vegetatie Bos- en Landschapsecologie Seasons Vegetation Forest and Landscape Ecology MRI
Zdroj:	Tree Physiology, 39, 1009-1018 Tree Physiology 39 (2019)
ISSN:	1758-4469 0829-318X
Popis:	Reactivation of axial water flow in ring-porous species is a complex process related to stem water content and developmental stage of both earlywood-vessel and leaf formation. Yet empirical evidence with non-destructive methods on the dynamics of water flow resumption in relation to these mechanisms is lacking. Here we combined in vivo magnetic resonance imaging and wood-anatomical observations to monitor the dynamic changes in stem water content and flow during spring reactivation in 4-year-old pedunculate oaks (Quercus robur L.) saplings. We found that previous year latewood vessels and current year developing earlywood vessels form a functional unit for water flow during growth resumption. During spring reactivation, water flow shifted from latewood towards the new earlywood, paralleling the formation of earlywood vessels and leaves. At leaves' full expansion, volumetric water content of previous rings drastically decreased due to the near-absence of water in fibre tissue. We conclude (i) that in ring-porous oak, latewood vessels play an important hydraulic role for bridging the transition between old and new water-conducting vessels and (ii) that fibre and parenchyma provides a place for water storage.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59c9a651f2ea3a2b77ca3420ecf42d71 https://doi.org/10.1093/treephys/tpz019 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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