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Báo cáo khoa học: "Resistance to water stress in seedlings of eight European provenances of Pinus halepensis Mill"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Resistance to water stress in seedlings of eight European provenances of Pinus halepensis Mill. | Ann. For. Sci. 58 2001 663-672 INRA EDP Sciences 2001 663 Original article Resistance to water stress in seedlings of eight European provenances of Pinus halepensis Mill. p Eol Qm occia OTiTii T V Q a Mourn T7olircia flnno PQz ilri-i-i-ih dnrl Qoi o c i-t O i ih Roberto Calamassi Gianni Della Rocca iviauio Falusi Elena Paoletti and Sara Strati a Dipartimento di Biologia Vegetale Piazzale delle Cascine 28 50144 Firenze Italy b Istituto per la Patologia degli Alberi Forestali-CNR Piazzale delle Cascine 28 50144 Firenze Italy Received 4 September 2000 accepted 17 April 2001 Abstract - In this study pressure volume curves were performed on 24-week-old seedlings of eight European provenances of Pinus ha-lepensis Mill. subsp. halepensis after one week of water stress -0.033 -0.4 -0.8 -1.2 -1.6 MPa . P. halepensis showed osmotic adjustments as a response to water stress although the response varied between the provenances. Apoplastic water remained relatively constant. The elasticity module did not differ significantly. Water deficit at incipient plasmolysis and water content decreased as the stress increased. Water potential was markedly negative even in seedlings not subjected to stress. The provenances from less xeric sites behaved similarly to species from non-arid sites while those from more xeric sites displayed the strategy typical of drought-tolerant species. The impact on all provenances of one week of low-intensity water stress -0.4 MPa was slight. As the stress increased the response varied between the provenances N-Eubea Kassandra Litorale tarantino Guardiola Otricoli E-Bouches du Rhône Hérault N-Vaucluse in decreasing order . Aleppo pine drought resistance geographic variation pressure-volume curves provenances Résumé - Resistance au stress hydrique des plantules appartenant à huit provenances européennes de Pinus halepensis Mill. Sur desplantules âgées de 24 semaines appartenant à 8 provenances dePinus halepensis Mill. subsp. halepensis des courbes .