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Forests 2017, 8(5), 148; doi:10.3390/f8050148

Cross-Talk between Physiological and Metabolic Adjustments Adopted by Quercus cerris to Mitigate the Effects of Severe Drought and Realistic Future Ozone Concentrations

Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy
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Received: 31 January 2017 / Revised: 24 April 2017 / Accepted: 26 April 2017 / Published: 29 April 2017
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Abstract

Global climate change represents a moving target for plant acclimation and/or adaptation, especially in the Mediterranean basin. In this study, the interactions of severe drought (20% of the effective daily evapotranspiration) and O3 fumigation (80 ppb, 5 h day−1, for 28 consecutive days) on (i) photosynthetic performance, (ii) cell membrane stability, (iii) hydric relations, (iv) accumulation of compatible solutes, and (v) lipophilic antioxidant compounds were investigated in young Quercus cerris plants. In addition to the typical drought-induced stomatal closure, imposition of water withholding dramatically influenced the profile of stress-associated metabolites, i.e., abscisic acid (ABA), proline, and lipophilic antioxidants. However, plants were not able to delay or prevent the negative effects of water deficit, the greatest impacting factor in this study. This translated into a steep decline of photosynthetic efficiency, leaf hydration, and membrane fluidity and permeability. When water stress was coupled with O3, plants orchestrated cross-talk among ABA, proline, and sugar in fully-expanded mature leaves, partially leading to a premature senescence. View Full-Text
Keywords: air pollution; global climate change; oxidative stress; Turkey oak; photosynthesis; stressors interaction air pollution; global climate change; oxidative stress; Turkey oak; photosynthesis; stressors interaction
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Cotrozzi, L.; Remorini, D.; Pellegrini, E.; Guidi, L.; Lorenzini, G.; Massai, R.; Nali, C.; Landi, M. Cross-Talk between Physiological and Metabolic Adjustments Adopted by Quercus cerris to Mitigate the Effects of Severe Drought and Realistic Future Ozone Concentrations. Forests 2017, 8, 148.

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