Assessing inter- and intraspecific variability of xylem vulnerability to embolism in oaks
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Assessing inter- and intraspecific variability of xylem vulnerability to embolism in oaks. / Lobo, Albin; Torres-Ruiz, José M.; Burlett, Regis; Lemaire, Cedric; Parise, Camille; Francioni, Claire; Truffaut, Laura; Tomášková, Ivana; Hansen, Jon Kehlet; Kjær, Erik Dahl; Kremer, Antoine; Delzon, Sylvain.
In: Forest Ecology and Management, Vol. 424, 2018, p. 53-61.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Assessing inter- and intraspecific variability of xylem vulnerability to embolism in oaks
AU - Lobo, Albin
AU - Torres-Ruiz, José M.
AU - Burlett, Regis
AU - Lemaire, Cedric
AU - Parise, Camille
AU - Francioni, Claire
AU - Truffaut, Laura
AU - Tomášková, Ivana
AU - Hansen, Jon Kehlet
AU - Kjær, Erik Dahl
AU - Kremer, Antoine
AU - Delzon, Sylvain
PY - 2018
Y1 - 2018
N2 - Abstract The genus Quercus comprises important species in forestry not only for their productive value but also for their ability to withstand drought. Hence an evaluation of inter- and intraspecific variation in drought tolerance is important for selecting the best adapted species and provenances for future afforestation. However, the presence of long vessels makes it difficult to assess xylem vulnerability to embolism in these species. Thanks to the development of a flow centrifuge equipped with a large rotor, we quantified (i) the between species variability of embolism resistance in four native and two exotic species of oaks in Europe and (ii) the within species variability in Quercus petraea. Embolism resistance varied significantly between species, with the pressure inducing 50% loss of hydraulic conductivity (P50) ranging between −7.0 and −4.2 MPa. Species native to the Mediterranean region were more resistant than pan-European species. In contrast, intraspecific variability in embolism resistance in Q. petraea was low within provenances and null between provenances. A positive correlation between P50 and vessel diameter among the six oak species indicates that the more embolism resistant species had narrower xylem vessels and a higher amount of hydraulic bridges between vessels. However, this tradeoff between hydraulic efficiency and safety was not observed between Q. petraea provenances.
AB - Abstract The genus Quercus comprises important species in forestry not only for their productive value but also for their ability to withstand drought. Hence an evaluation of inter- and intraspecific variation in drought tolerance is important for selecting the best adapted species and provenances for future afforestation. However, the presence of long vessels makes it difficult to assess xylem vulnerability to embolism in these species. Thanks to the development of a flow centrifuge equipped with a large rotor, we quantified (i) the between species variability of embolism resistance in four native and two exotic species of oaks in Europe and (ii) the within species variability in Quercus petraea. Embolism resistance varied significantly between species, with the pressure inducing 50% loss of hydraulic conductivity (P50) ranging between −7.0 and −4.2 MPa. Species native to the Mediterranean region were more resistant than pan-European species. In contrast, intraspecific variability in embolism resistance in Q. petraea was low within provenances and null between provenances. A positive correlation between P50 and vessel diameter among the six oak species indicates that the more embolism resistant species had narrower xylem vessels and a higher amount of hydraulic bridges between vessels. However, this tradeoff between hydraulic efficiency and safety was not observed between Q. petraea provenances.
KW - Plant hydraulics
KW - Xylem embolism
KW - Drought resistance
KW - Climate change
KW - Oaks
U2 - 10.1016/j.foreco.2018.04.031
DO - 10.1016/j.foreco.2018.04.031
M3 - Journal article
C2 - 29910530
VL - 424
SP - 53
EP - 61
JO - Forest Ecology and Management
JF - Forest Ecology and Management
SN - 0378-1127
ER -
ID: 196240783