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Carbon dioxide induces minor antioxidant responses in Eucalyptus urophylla chloroplasts

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Minor effect on the chloroplast antioxidant proteins was detected in Eucalyptus urophylla cultivated in high-CO2 atmosphere.

Abstract

Global climate change can significantly alter plant cell metabolism. A higher atmospheric CO2 scenario may be beneficial for C3 plants through the stimulation of photosynthesis. This predicted increase in the rate of carbon assimilation may also increase the expression of enzymes involved in the antioxidant cellular defense. Here, we studied the responses of the chloroplastic antioxidant system of Eucalyptus urophylla plants cultivated in a high-CO2 condition. Plants exposed to a high concentration (980 ppm) of CO2 showed an increase in the H2O2 concentration and MDA content in relation to those cultivated at 410 and 680 ppm. With the discovery proteomics approach used herein, we identified 19 chloroplastic antioxidant proteoforms and pinpointed differentially regulated isoforms of an ascorbate peroxidase and a superoxidase dismutase upon cultivation in a high-CO2 atmosphere. Our data indicate that the CO2 stimulus induces only minor changes in the antioxidant metabolism of E. urophylla chloroplasts.

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Acknowledgements

We thank Dra. Priscila Lupino Gratão from the São Paulo State University for providing the laboratory infrastructure for the quantification of H2O2 and MDA content analysis. This work had financial support from São Paulo Research Foundation—FAPESP (Grant number 2015/23354-8) and Coordination for the Improvement of Higher Education Personnel—CAPES.

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Correspondence to Tiago Santana Balbuena.

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The authors declare that they have no conflict of interest.

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Communicated by Heckathorn.

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Baldassi, A.C., dos Santos, B.M. & Balbuena, T.S. Carbon dioxide induces minor antioxidant responses in Eucalyptus urophylla chloroplasts. Trees 32, 1481–1485 (2018). https://doi.org/10.1007/s00468-018-1750-8

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  • DOI: https://doi.org/10.1007/s00468-018-1750-8

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