Evidence for Hydraulic Vulnerability Segmentation and Lack of Xylem Refilling under Tension1[OPEN]
نویسندگان
چکیده
Bordeaux Sciences Agro, Institut des Sciences de la Vigne et du Vin, Ecophysiologie et Génomique Fonctionnelle de la Vigne, Unité Mixte de Recherche 1287, F–33140 Villenave d’Ornon, France (G.C., G.A.G.); BIOGECO, INRA, Univ. Bordeaux, 33610 Cestas, France (G.C., J.M.T.-R., R.B., S.D.); PIAF, Institut National de la Recherche Agronomique, UCA, 63000 Clermont-Ferrand, France (E.B., H.C.); Hawkesbury Institute for the Environment, Western Sydney University, Richmond, New South Wales 2753, Australia (B.C.); Unité Mixte de Recherche SAVE, INRA, BSA, Univ. Bordeaux, 33882 Villenave d’Ornon, France (C.E.L.D.); Bordeaux Sciences Agro, Unité Mixte de Recherche 1391 ISPA, F–33882 Villenave d’Ornon, France (J.-C.D.); Nicholas School of the Environment, Duke University, Durham, North Carolina 27708 (J.-C.D.); Institute of Systematic Botany and Ecology, Ulm University, Ulm D–89081, Germany (S.J.); Synchrotron SOLEIL, L’Orme de Merisiers, Saint Aubin-BP48, 91192 Gif-sur-Yvette cedex, France (A.K.); Centre National de la Recherche Scientifique, Univ. Bordeaux, UMS 3626 Placamat F–33608 Pessac, France (N.L.); and INRA, UR629 Ecologie des Forêts Méditerranéennes, 84914 Avignon, France (N.M.-S.)
منابع مشابه
Evidence for Hydraulic Vulnerability Segmentation and Lack of Xylem Refilling under Tension.
The vascular system of grapevine (Vitis spp.) has been reported as being highly vulnerable, even though grapevine regularly experiences seasonal drought. Consequently, stomata would remain open below water potentials that would generate a high loss of stem hydraulic conductivity via xylem embolism. This situation would necessitate daily cycles of embolism repair to restore hydraulic function. H...
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A recent study found that cutting shoots under water while xylem was under tension (which has been the standard protocol for the past few decades) could produce artefactual embolisms inside the xylem, overestimating hydraulic vulnerability relative to shoots cut under water after relaxing xylem tension (Wheeler et al. 2013). That study also raised the possibility that such a 'Wheeler effect' mi...
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Trunks of large trees play an important role in whole-plant water balance but technical difficulties have limited most hydraulic research to small stems, leaves, and roots. To investigate the dynamics of water-related processes in tree trunks, such as winter embolism refilling, xylem hydraulic vulnerability, and water storage, volumetric water content (VWC) in the main stem was monitored contin...
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Xylem cavitation and its recovery were studied in 1-year-old stems of ring-porous Quercus serrata Thunb. and diffuse-porous Betula platyphylla var. japonica Hara. The Q. serrata had 5-100 microm vessel diameter in the functional current xylem and 5-75 microm in nonconducting 1-year-old xylem; B. platyphylla had a narrower range of vessel diameters of 5-55 microm and more than double the number ...
متن کاملShort-time xylem relaxation results in reliable quantification of embolism in grapevine petioles and sheds new light on their hydraulic strategy.
In recent years, the validity of embolism quantification methods has been questioned, especially for long-vesseled plants. Some studies have suggested that cutting xylem while under tension, even under water, might generate artificial cavitation. Accordingly, a rehydration procedure prior to hydraulic measurements has been recommended to avoid this artefact. On the other hand, concerns have bee...
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تاریخ انتشار 2016