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http://hdl.handle.net/10174/5244
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Title: | Cork oak (Quercus suber L.) seedlings acclimate to elevated |
Authors: | Vaz. M Cochard. H Gazarini. L Graça. J Chaves. M. M Pereira. J. S |
Keywords: | Elevated CO2 Growth Hydraulic Leaf and wood anatomy Photosynthesis Quercus suber Soil water stress |
Issue Date: | 14-Feb-2012 |
Publisher: | Springer verlag |
Citation: | Trees (2012) 26:1145–1157 |
Abstract: | Leaf gas-exchange, leaf and shoot anatomy,
wood density and hydraulic conductivity were investigated in
seedlings of Quercus suber L. grown for 15 months either at
elevated (700 lmol mol-1) or normal (350 lmol mol-1)
ambient atmospheric CO2 concentrations. Plants were
grown in greenhouses in a controlled environment: relative
humidity 50% (±5), temperature similar to external temperature
and natural light conditions. Plants were supplied
with nutrients and two water regimes (WW, well watered;
WS, water stress). After 6 months exposure to CO2
enrichment an increase in photosynthetic rate, a decrease in
stomatal conductance and a decrease in carbon isotope
discrimination (D13C) were observed, along with enhanced
growth and an increase in the number of branches and
branch diameter. Over the same period, the shoot weight
ratio increased, the root weight ratio decreased and the leaf
weight ratio was unaffected. The specific leaf area increased
due to an increase in total leaf thickness, mainly due to the
palisade parenchyma and starch. However, after 9 and
15 months of elevated CO2 exposure, the above-mentioned
physiological and morphological parameters appeared to be
unaffected. Elevated CO2 did not promote changes in vessel
lumen diameter, vessel frequency or wood density in stems
grown in greenhouse conditions. As a consequence, xylem
hydraulic efficiency remained unchanged. Likewise, xylem
vulnerability to embolism was not modified by elevated
CO2. In summary, elevated CO2 had no positive effect on
the ecophysiological parameters or growth of water stressed
plants. |
URI: | http://hdl.handle.net/10174/5244 |
Type: | article |
Appears in Collections: | MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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