Free access
Ann. For. Sci.
Volume 57, Number 4, May 2000
Page(s) 305 - 312
DOI: 10.1051/forest:2000121

Ann. For. Sci. 57 (2000) 305-312

Influence of the ectomycorrhizas formed by Tuber melanosporum Vitt. on hydraulic conductance and water relations of Quercus ilex L. seedlings

Andrea Nardinia - Sebastiano Salleoa - Melvin T. Tyreeb - Moreno Vertoveca

aDipartimento di Biologia, Università di Trieste, Via L. Giorgieri 10, 34127 Trieste, Italia
bUSDA Forest Service, Northeastern Experiment Station, 705 Spear Street, Burlington, VT 05402-0968, USA

(Received 8 November 1999; accepted 7 February 2000)


The physiological impact of ectomycorrhizal infection was investigated in the association between Tuber melanosporum Vitt. and Quercus ilex L. A number of physiological parameters were investigated on 2-year-old seedlings inoculated for 22 months (I-seedlings) compared to non-inoculated plants (NI-seedlings). I-seedlings had a 100% infection rate in root tips compared to a 25% infection rate in root tips of NI-seedlings. I-seedlings had higher values of net assimilation and stomatal conductance than NI-seedlings. Root hydraulic conductance per unit root surface area of I-seedlings was much reduced to 0.44$\times$ that of NI-seedlings but had 2.5$\times$ more fine root surface area than NI-seedlings. When root conductance was scaled by leaf area, the I-seedlings had 1.27$\times$ the root conductance per unit leaf area compared to NI-seedlings. I-seedlings also had significantly higher hydraulic conductances of shoots with leaves, of shoots without leaves and lower leaf blade hydraulic resistances.

Keywords: hydraulic conductance / water relations / ectomycorrhiza / Quercus ilex L. / HPFM


Influence sur la conductance hydraulique et les relations hydriques des semis de Quercus ilex L. des ectomycorrhizes formées par Tuber melanosporum Vitt. L'impact physiologique dû à l'infection d'ectomycorrhizes a été étudié dans l'association Tuber melanosporum Vitt. et Quercus ilex L. Un certain nombre de paramètres physiologiques ont été mesurés sur des semis de 2 ans inoculés pendant 22 mois (semis-i) en comparaison avec des cultures saines (semis-i). Les semis-i présentent 100% de taux d'infection des racines, tandis que les semis-i atteignent un taux de 25%. Les semis-i ont des niveaux d'assimilation nette plus élevés par rapport aux semis-i. La conductance hydraulique des racines par unité de surface des racines pour les semis-i est réduite de plus de 0,44 fois par rapport aux semis-i, mais comporte une surface de racines 2,5 fois inférieure à celle des semis-i. En rapportant la conductance des racines à la surface des feuilles, la conductance des racines par unité de surface des feuilles des semis-i est 1,27 fois plus élevée que celle des semis-i. Les semis-i présentent également une conductance hydraulique des rameaux avec feuilles et sans feuilles bien plus élevée, ainsi qu'une moindre résistance hydraulique des feuilles.

Mots clé : conductance hydraulique / relations hydriques / ectomycorrhize / Quercus ilex L. / HPFM

Correspondence and reprints: Andrea Nardinia
Tel. +39-040-6763875; Fax. +39-040-568855;

Copyright INRA, EDP Sciences

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see You should disable this module if you wish to use the OpenURL server that you or your library have defined.