TY - JOUR
T1 - Growth and physiological responses to ozone and mild drought stress of tree species with different ecological requirements
AU - Pollastrini, Martina
AU - Desotgiu, Rosanna
AU - Cascio, Chiara
AU - Bussotti, Filippo
AU - Cherubini, Paolo
AU - Saurer, Matthias
AU - Gerosa, Giacomo Alessandro
AU - Marzuoli, Riccardo
PY - 2010
Y1 - 2010
N2 - An open-top chamber experiment was carried
out in Curno (Northern Italy) in 2004 and 2005 on seedlings
of Fagus sylvatica (FS), Quercus robur (QR), and an
ozone-sensitive Populus (POP) clone, to investigate the
role of two stress factors: tropospheric ozone and water
shortage. Treatments were filtered air to achieve a 50%
reduction in the environmental ozone concentrations
(charcoal filtered, CF); and non-filtered air, with a 5%
reduction in the environmental ozone concentrations
(non-filtered, NF). Overall ozone exposure (AOT40) in
open air (April–September) was 26,995 ppb h in 2004 and
25,166 ppb h in 2005. The plants were either watered (W)
or not watered (dry, D). We investigated the above-ground
biomass, tree-ring growth, stable carbon isotopes ratio, i.e.
d13C of tree rings, and the photosynthetic parameter
Driving forces (DFABS), derived from chlorophyll a fluorescence
analysis. Ozone-induced growth reduction (in
terms of biomass) in POP, and that reduction was more
pronounced in D plots. A synergistic effect of ozone and
drought stress was evidenced by DFABS in POP and QR,
but not in FS. The water availability was revealed as the
main factor influencing the isotopic ratio d13C. In droughtstressed
seedlings, the increase in d13C value was accompanied
by the reduction in stomatal conductance and
increased DFABS. Fast-growing plant species with high
water requirements are more susceptible to ozone and
drought stress.
AB - An open-top chamber experiment was carried
out in Curno (Northern Italy) in 2004 and 2005 on seedlings
of Fagus sylvatica (FS), Quercus robur (QR), and an
ozone-sensitive Populus (POP) clone, to investigate the
role of two stress factors: tropospheric ozone and water
shortage. Treatments were filtered air to achieve a 50%
reduction in the environmental ozone concentrations
(charcoal filtered, CF); and non-filtered air, with a 5%
reduction in the environmental ozone concentrations
(non-filtered, NF). Overall ozone exposure (AOT40) in
open air (April–September) was 26,995 ppb h in 2004 and
25,166 ppb h in 2005. The plants were either watered (W)
or not watered (dry, D). We investigated the above-ground
biomass, tree-ring growth, stable carbon isotopes ratio, i.e.
d13C of tree rings, and the photosynthetic parameter
Driving forces (DFABS), derived from chlorophyll a fluorescence
analysis. Ozone-induced growth reduction (in
terms of biomass) in POP, and that reduction was more
pronounced in D plots. A synergistic effect of ozone and
drought stress was evidenced by DFABS in POP and QR,
but not in FS. The water availability was revealed as the
main factor influencing the isotopic ratio d13C. In droughtstressed
seedlings, the increase in d13C value was accompanied
by the reduction in stomatal conductance and
increased DFABS. Fast-growing plant species with high
water requirements are more susceptible to ozone and
drought stress.
KW - drought
KW - growth
KW - ozone
KW - poplar
KW - stress
KW - drought
KW - growth
KW - ozone
KW - poplar
KW - stress
UR - http://hdl.handle.net/10807/28920
U2 - 10.1007/s00468-010-0439-4
DO - 10.1007/s00468-010-0439-4
M3 - Article
SN - 0931-1890
SP - 695
EP - 704
JO - TREES
JF - TREES
ER -