Journal
ENVIRONMENTAL POLLUTION
Volume 137, Issue 3, Pages 517-524Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2005.01.037
Keywords
nutrients; gas-exchange rates; growth; carboxylation enzymes; water potential
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A long-term experiment was performed to study the effects Of O-3 and drought-stress (DS) on Aleppo pine seedlings (Pinus halepensis Mill.) exposed in open-top chambers. Ozone reduced gas exchange rates, ribulose-1,5-biphosphate carboxylase/oxygenase activity (Rubisco), aboveground C and needle N concentrations and C/N ratio and Ca concentrations of the twigs under 3 mm (twigs < 3) and the aerial biomass. Also it increased phosphoenolpyruvate carboxylase (PEPc) and N and K concentrations of the twigs < 3. Water stress decreased gas exchange rates, predawn needle water potential Psi(Pd)), C/N ratio, twigs < 3 Ca, plant growth, aerial biomass and increased N, twigs with a diameter above 3 mm P and Mg concentrations. The combined exposure to both stresses increased N concentrations of twigs < 3 and roots and aboveground biomass K content and decreased root C, maximum daily assimilation rate and instantaneous water use efficiency. The sensitivity of Aleppo pine to both stresses is determined by plant internal resource allocation and compensation mechanisms to cope with stress. (c) 2005 Elsevier Ltd. All rights reserved.
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