TAILIEUCHUNG - Báo cáo lâm nghiệp: "Leaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications on its drought resistance capacity"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:""Leaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications on its drought resistance capacity" | Ann. For. Sci. 62 2005 297-302 297 INRA EDP Sciences 2005 DOI forest 2005024 Original article Leaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis D. Don Pic. Ser. et Bizzarri implications on its drought resistance capacity Javier E. Gyenge María Elena Fernández Guillermina Dalla Salda Tomás Schlichter INTA Estación Experimental Agropecuaria Bariloche CC 277 8400 San Carlos de Bariloche Argentina Received 5 May 2004 accepted 18 October 2004 Abstract - Physiological studies have suggested that A. chilensis would survive during drought avoiding water stress through an early stomatal closure. However there are no studies that have explored other potential mechanisms related to drought resistance or avoidance. The objectives were 1 to measure hydraulic resistance vulnerability to cavitation and leaf water relations and 2 to compare these characteristics between different provenances. Pressure-volume curves demonstrate that A. chilensis has high osmotic potentials at full turgor high water potentials at turgor loss point low modulus of elasticity and did not present elastic or osmotic adjustments after drought. Compared to other gymnosperms A. chilensis has a high total plant resistance but also a high vulnerability to cavitation. We found no differences between the studied provenances in these variables. Our results confirm that A. chilensis is a drought-avoidance species and suggest that phenotypic morphological differentiation between populations allows the species to survive throughout its broad distribution. pressure-volume curves xylem cavitation stomatal conductance drought avoidance water stress Résumé - Relations hydriques au niveau de la feuille et du plant chez un conifere de Patagonie Austrocedrus chilensis D. Don Pic. Ser. et Bizzarri implications pour sa capacité à résister à la sécheresse. Des études physiologiques suggèrent que l Austrocedrus chilensis peut survivre aux périodes de sécheresse évitant le stress .

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