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Chemosphere v.172, 2017년, pp.363 - 372   SCI SCIE SCOPUS
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Current ambient concentrations of ozone in Panama modulate the leaf chemistry of the tropical tree Ficus insipida

Schneider, Gerald F. (Department of Biology, University of Utah, 257 South 1400 East, Salt Lake City, UT 84112, USA ) ; Cheesman, Alexander W. (College of Science & Engineering, James Cook University, Cairns, Queensland, 4870, Australia ) ; Winter, Klaus (Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancon, Panama ) ; Turner, Benjamin L. (Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancon, Panama ) ; Sitch, Stephen (Department of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, United Kingdom ) ; Kursar, Thomas A. (Department of Biology, University of Utah, 257 South 1400 East, Salt Lake City, UT 84112, USA ) ;
  • 초록  

    Abstract Tropospheric ozone (O 3 ) is a major air pollutant and greenhouse gas, affecting carbon dynamics, ecological interactions, and agricultural productivity across continents and biomes. Elevated [O 3 ] has been documented in tropical evergreen forests, the epicenters of terrestrial primary productivity and plant-consumer interactions. However, the effects of O 3 on vegetation have not previously been studied in these forests. In this study, we quantified ambient O 3 in a region shared by forests and urban/commercial zones in Panama and found levels two to three times greater than in remote tropical sites. We examined the effects of these ambient O 3 levels on the growth and chemistry of seedlings of Ficus insipida , a regionally widespread tree with high stomatal conductance, using open-top chambers supplied with ozone-free or ambient air. We evaluated the differences across treatments in biomass and, using UPLC-MS-MS, leaf secondary metabolites and membrane lipids. Mean [O 3 ] in ambient air was below the levels that induce chronic stress in temperate broadleaved trees, and biomass did not differ across treatments. However, leaf secondary metabolites – including phenolics and a terpenoid – were significantly downregulated in the ambient air treatment. Membrane lipids were present at lower concentrations in older leaves grown in ambient air, suggesting accelerated senescence. Thus, in a tree species with high O 3 uptake via high stomatal conductance, current ambient [O 3 ] in Panamanian forests are sufficient to induce chronic effects on leaf chemistry. Highlights Elevated [O 3 ] was recorded at three forests near NO x emission hotspots in Panama. This [O 3 ] affected the physiology of the widespread native tree Ficus insipida. The effects of O 3 on F. insipida included a decrease in leaf chemical defenses. O 3 also led to decreased lipid content in mature leaves. AOT was below critical levels for temperate trees, but F. insipida has high g s_max.


  • 주제어

    Ozone .   Tropical forest .   Open-top chamber .   Secondary metabolite .   Senescence .   Stomatal conductance.  

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