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How do drought and warming influence survival and wood traits of Picea mariana saplings?

Balducci L, Deslauriers A, Giovannelli A, Beaulieu M, Delzon S, Rossi S, Rathgeber CB - J. Exp. Bot. (2014)

Bottom Line: Warming, in conjunction with 25 d of water deficit, increased sapling mortality (10% and 20% in night-time and daytime warming, respectively) compared with the control conditions (0.8%).Drought substantially decreased gas exchange, and also pre-dawn and mid-day leaf water potential to values close to -3MPa which probably induced xylem embolism (xylem air entry point, P₁₂, being on average around -3MPa for this species).In addition, the recovery of gas exchange never reached the initial pre-stress levels, suggesting a possible loss of xylem hydraulic conductivity associated with cavitation.

View Article: PubMed Central - PubMed

Affiliation: Département des Sciences Fondamentales, Université du Québec à Chicoutimi, 555 boulevard de l'Université, Chicoutimi, QC G7H2B1, Canada lorena.balducci1@uqac.ca.

No MeSH data available.


Related in: MedlinePlus

Mean percentage loss of hydraulic conductance (PLC%) versus xylem pressure (MPa) for black spruce saplings The vulnerability curve was obtained with the cavitron technique.
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Figure 4: Mean percentage loss of hydraulic conductance (PLC%) versus xylem pressure (MPa) for black spruce saplings The vulnerability curve was obtained with the cavitron technique.

Mentions: The xylem pressure inducing 50% loss of conductance (P50) reached average values of −4.26MPa, and the air point entry (P12) reached average values of −2.95MPa in irrigated saplings (Fig. 4; Table 2). The slope of the vulnerability curve (S) was 41.71% MPa–1 (Table 2). The difference between Ψmin and Ψ50 was 2.59MPa for irrigated saplings. The values of PLCp ranged from 4.8% to 8.0%.


How do drought and warming influence survival and wood traits of Picea mariana saplings?

Balducci L, Deslauriers A, Giovannelli A, Beaulieu M, Delzon S, Rossi S, Rathgeber CB - J. Exp. Bot. (2014)

Mean percentage loss of hydraulic conductance (PLC%) versus xylem pressure (MPa) for black spruce saplings The vulnerability curve was obtained with the cavitron technique.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4265170&req=5

Figure 4: Mean percentage loss of hydraulic conductance (PLC%) versus xylem pressure (MPa) for black spruce saplings The vulnerability curve was obtained with the cavitron technique.
Mentions: The xylem pressure inducing 50% loss of conductance (P50) reached average values of −4.26MPa, and the air point entry (P12) reached average values of −2.95MPa in irrigated saplings (Fig. 4; Table 2). The slope of the vulnerability curve (S) was 41.71% MPa–1 (Table 2). The difference between Ψmin and Ψ50 was 2.59MPa for irrigated saplings. The values of PLCp ranged from 4.8% to 8.0%.

Bottom Line: Warming, in conjunction with 25 d of water deficit, increased sapling mortality (10% and 20% in night-time and daytime warming, respectively) compared with the control conditions (0.8%).Drought substantially decreased gas exchange, and also pre-dawn and mid-day leaf water potential to values close to -3MPa which probably induced xylem embolism (xylem air entry point, P₁₂, being on average around -3MPa for this species).In addition, the recovery of gas exchange never reached the initial pre-stress levels, suggesting a possible loss of xylem hydraulic conductivity associated with cavitation.

View Article: PubMed Central - PubMed

Affiliation: Département des Sciences Fondamentales, Université du Québec à Chicoutimi, 555 boulevard de l'Université, Chicoutimi, QC G7H2B1, Canada lorena.balducci1@uqac.ca.

No MeSH data available.


Related in: MedlinePlus