Photosynthetic responses to elevated CO(2) and O(3) in Quercus ilex leaves at a natural CO(2) spring

Environmental Pollution
E PaolettiH Thomsen

Abstract

Photosynthetic stimulation and stomatal conductance (Gs) depression in Quercus ilex leaves at a CO(2) spring suggested no down-regulation. The insensitivity of Gs to a CO(2) increase (from ambient 1500 to 2000 micromol mol(-1)) suggested stomatal acclimation. Both responses are likely adaptations to the special environment of CO(2) springs. At the CO(2)-enriched site, not at the control site, photosynthesis decreased 9% in leaves exposed to 2x ambient O(3) concentrations in branch enclosures, compared to controls in charcoal-filtered air. The stomatal density reduction at high CO(2) was one-third lower than the concomitant Gs reduction, so that the O(3) uptake per single stoma was lower than at ambient CO(2). No significant variation in monoterpene emission was measured. Higher trichome and mesophyll density were recorded at the CO(2)-enriched site, accounting for lower O(3) sensitivity. A long-term exposure to H(2)S, reflected by higher foliar S-content, and CO(2) might depress the antioxidant capacity of leaves close to the vent and increase their O(3) sensitivity.

References

Aug 22, 2003·Nature·Alistair M Hetherington, F Ian Woodward
Sep 4, 2003·Tree Physiology·Matthias SaurerRolf Siegwolf
Jan 1, 1997·Environmental Pollution·E PääkkönenL Kärenlampi
Jul 12, 2005·Environmental Pollution·Elena Paoletti, Nancy E Grulke
Mar 23, 2006·Environmental Pollution·E Paoletti
Sep 15, 1981·Applied Optics·C W Draper

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Citations

Aug 14, 2009·Environmental Pollution·Johanna RiikonenDavid F Karnosky
Nov 17, 2009·Environmental Pollution·Joseph N T DarbahDavid F Karnosky
Nov 20, 2008·Journal of Integrative Plant Biology·Sasmita MishraJonathan Frantz
Jul 28, 2017·Environmental Science and Pollution Research International·Yasutomo HoshikaElena Paoletti

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