Metabolic and physiological alterations indicate that the tropical broadleaf tree Eugenia uniflora L. is sensitive to ozone
| Autor: | Elisa Carrari, Yasutomo Hoshika, Elena Paoletti, Marisia Pannia Esposito, Marcela Regina Gonçalves da Silva Engela, Francine Faia Fernandes, Marisa Domingos, Cláudia Maria Furlan |
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| Rok vydání: | 2020 |
| Předmět: |
Stomatal conductance
Environmental Engineering Antioxidant food.ingredient 010504 meteorology & atmospheric sciences medicine.medical_treatment Carbohydrates 010501 environmental sciences FOTOSSÍNTESE Photosynthesis 01 natural sciences Eugenia Trees Lipid peroxidation chemistry.chemical_compound food Ozone medicine Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Flavonoids Air Pollutants Chemistry Eugenia uniflora Primary metabolite food and beverages South America Pollution Plant Leaves Horticulture Growth and biomass Shoot Reactive oxygen species Tropical species Fruit tree |
| Zdroj: | Science of the total environment 769 (2021): 145080. doi:10.1016/j.scitotenv.2021.145080 info:cnr-pdr/source/autori:Engela M.R.G.D.S.; Furlan C.M.; Esposito M.P.; Fernandes F.F.; Carrari E.; Domingos M.; Paoletti E.; Hoshika Y./titolo:Metabolic and physiological alterations indicate that the tropical broadleaf tree Eugenia uniflora L. is sensitive to ozone/doi:10.1016%2Fj.scitotenv.2021.145080/rivista:Science of the total environment/anno:2021/pagina_da:145080/pagina_a:/intervallo_pagine:145080/volume:769 Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1879-1026 |
| DOI: | 10.1016/j.scitotenv.2021.145080 |
| Popis: | Eugenia uniflora L. is an important fruit tree native to tropical South America that adapts to different habitats, thanks to its metabolic diversity and ability to adjust the leaf antioxidant metabolism. We hypothesized that this metabolic diversity would also enable E. uniflora to avoid oxidative damage and tolerate the enhanced ozone (O3) concentrations that have been registered in the (sub)tropics. We investigated whether carbohydrates, polyphenols and antioxidants are altered and markers of oxidative damage (ROS accumulation, alterations in leaf gas exchange, growth and biomass production) are detected in plants exposed to two levels of O3 (ambient air and twice elevated ozone level in a O3-FACE system for 75 days). Phytotoxic O3 dose above a threshold of 0 nmol m−2 s−1 (POD0) and accumulated exposure above 40 ppb (AOT40) were 3.6 mmol m−2 and 14.898 ppb h at ambient, and 4.7 mmol m−2 and 43.881 ppb h at elevated O3. Twenty-seven primary metabolites and 16 phenolic compounds were detected in the leaves. Contrary to the proposed hypothesis that tropical broadleaf trees are relatively O3 tolerant, we concluded that E. uniflora plants are sensitive to elevated O3 concentrations. Experimental POD0 values were lower than the critical levels for visible foliar O3, because of low stomatal conductance. In spite of this low stomatal O3 uptake, we found classic O3 injury, e.g. reduction in carbohydrates and fatty acids concentrations; non-significant changes in the polyphenol profile; inefficient antioxidant responses; increased contents of ROS and indicators of lipid peroxidation; reductions in stomatal conductance, net photosynthesis, root/shoot ratio and height growth. However, we also found some compensation mechanisms, e.g. increased leaf concentration of polyols for protecting the membranes, and increased leaf number for compensating the decline of photosynthetic rate. These results help filling the knowledge gap about tropical tree responses to O3. |
| Databáze: | OpenAIRE |
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