Journal
BIOLOGIA PLANTARUM
Volume 57, Issue 2, Pages 313-324Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-012-0274-0
Keywords
carotenoids, hydrogen peroxide; nitric oxide; net photosynthetic rate; Populus spp., stomatal conductance, xanthophyll cycle
Categories
Funding
- University of Pisa
- Scuola Superiore Sant'Anna, Pisa
- Italian Ministry for Education, University and Research
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Information on plant responses to combined ozone and cadmium stresses are scarce and limited to herbaceous species. In this research, two poplar clones (I-214 and Eridano), differently sensitive to O-3, were grown for 5 weeks in pots supplied with 0, 53.5, and 160.5 mg(Cd) kg(-1)(soil d.m.) and then exposed to 15-d O-3 fumigation (0.06 mm(3) dm(-3), 5 h a day). The effects of the two stressors, alone or in combination, on Cd, Ca, Fe, and Zn accumulation in above- and below-ground organs, photosynthesis, leaf pigments, and accumulation of H2O2 and NO were investigated. Cadmium induced a reduction in stomatal conductance and a significant accumulation of H2O2 and NO in both clones and negatively affected the carotenoid content in I-214. Ozone, on the other hand, counteracted Cd accumulation in the above-ground organs and significantly increased the xanthophyll de-epoxidation state indicating photoinhibition in O-3-treated plants. Surprisingly, O-3 alone or in combination with Cd decreased H2O2 accumulation in I-214. The NO production was generally stimulated by Cd, whereas it decreased following O-3 exposure in I-214. The overall data indicate that Cd and O-3 induced clone specific responses. Moreover, when they were applied in combination, antagonistic rather than synergistic effects were observed.
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