tailieunhanh - Báo cáo khoa học: "Influence of the ectomycorrhizas formed by Tuber melanosporum Vitt. on hydraulic conductance and water relations of Quercus ilex L. seedlings"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Influence of the ectomycorrhizas formed by Tuber melanosporum Vitt. on hydraulic conductance and water relations of Quercus ilex L. seedlings. | 305 Ann. For. Sci. 57 2000 305-312 INRA EDP Sciences Original article Influence of the ectomycorrhizas formed by Tuber melanosporum Vitt. on hydraulic conductance and water relations of Quercus ilex L. seedlings Andrea Nardin Sebastiano Salleoa Melvin T. Tyreeb and Moreno Vertoveca a Dipartimento di Biologia Università di Trieste Via L. Giorgieri 10 34127 Trieste Italia b USDA Forest Service Northeastern Experiment Station 705 Spear Street Burlington VT 05402-0968 USA Received 8 November 1999 accepted 7 February 2000 Abstract - 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 that of NI-seedlings but had more fine root surface area than NI-seedlings. When root conductance was scaled by leaf area the I-seedlings had 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. hydraulic conductance water relations ectomycorrhiza Quercus ilex L. HPFM Résumé - Influence sur la conductance hydraulique et les relations hydriques des semis de Quercus ilex L. des ectomycorrhizes formees par Tuber melanosporum Vitt. L impact physiologique dũ 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