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- W2010166147 abstract "We studied hydraulic traits of young plants of the Mediterranean cedar species Cedrus atlantica (Endl.) G. Manetti ex Carrière (Luberon, France), C. brevifolia (Hook. f.) Henry (Cyprus), C. libani A. Rich (Hadeth El Jebbe, Lebanon) and C. libani (Armut Alani, Turkey). With an optimum water supply, no major differences were observed among species or provenances in either stem hydraulic conductivity (Ks) or leaf specific conductivity (Kl) measured on the main shoot. A moderate soil drought applied for 10 weeks induced marked acclimation through a reduction in Ks, particularly in the Lebanese provenance of C. libani, and a decrease in tracheid lumen size in all species. Cedrus atlantica, which had the smallest tracheids, was the species most vulnerable to embolism: a 50% loss in hydraulic conductivity (ΨPLC50) occurred at a water potential of –4.4 MPa in the well-watered treatment, and at –6.0 MPa in the moderate drought treatment. In the other species, ΨPLC50 was unaffected by moderate soil drought, and only declined sharply at water potentials between –6.4 and –7.5 MPa in both irrigation treatments. During severe drought, Ks of twigs and stomatal conductance (gs) were measured simultaneously as leaf water potential declined. For all species, lower vulnerability to embolism based on loss of Ks was recorded on current-year twigs. The threshold for stomatal closure (10% of maximum gs) was reached at a predawn water potential (Ψpd) of –2.5 MPa in C. atlantica (Luberon) and at –3.1 MPa in C. libani (Lebanon), whereas the other provenance and species had intermediate Ψpd values. Cedrus brevifolia, with a Ψpd (–3.0 MPa) close to that of C. libani (Lebanon), had the highest stomatal conductance of the study species. The importance of a margin of safety between water potential causing stomatal closure and that causing xylem embolism induction is discussed." @default.
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- W2010166147 date "2005-09-01" @default.
- W2010166147 modified "2023-10-17" @default.
- W2010166147 title "Drought effects on hydraulic conductivity and xylem vulnerability to embolism in diverse species and provenances of Mediterranean cedars" @default.
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- W2010166147 doi "https://doi.org/10.1093/treephys/25.9.1109" @default.
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