Effects of zinc excess on antioxidant metabolism, mineral content and initial growth of Handroanthus impetiginosus (Mart. ex DC.) Mattos and Tabebuia roseoalba (Ridl.) Sandwith
| Autor: | Ana Paula Camargo Gai, Evandro Alves Vieira, Daniela Soares dos Santos |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Handroanthus impetiginosus Antioxidant medicine.medical_treatment chemistry.chemical_element Plant Science Zinc 010501 environmental sciences Photosynthesis 01 natural sciences chemistry.chemical_compound Bioremediation Botany medicine Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences biology Phosphorus fungi food and beverages biology.organism_classification Tabebuia chemistry Anthocyanin Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Environmental and Experimental Botany. 144:88-99 |
| ISSN: | 0098-8472 |
| Popis: | Zinc (Zn) participates in numerous metabolic processes in plants under normal concentrations. In polluted environments, plants can develop different strategies to cope with Zn excess. Zinc stress can alter the photosynthetic metabolism and increase the production of reactive oxygen species (ROS). Therefore, this study aimed at evaluating the zinc tolerance of Handroanthus impetiginosus (Pink Ipe) and Tabebuia roseoalba (White ipe) under greenhouse conditions. We assessed the effects of different Zn concentrations on photosynthetic performance and maximum quantum yield (F v /F m ), pigment concentrations, antioxidant enzyme activities, content of macro and micronutrients in the tissues and growth parameters. Both species showed different strategies to tolerate Zn stress. Pink ipe plants accumulated larger amounts of zinc in the roots without showing severe damage in the aerial parts. Meanwhile, White ipe plants mobilized Zn to the aerial parts and showed less accumulation in the roots, with major effects on leaves. Growth was negatively affected in both plant species, which was evidenced by the decline in photosynthetic rates, most likely due the adverse effect of Zn on the electron transport chain. Upregulation of photoprotective mechanisms such as the increase in anthocyanin content and activities of antioxidant enzymes minimized the H 2 O 2 content and oxidative damage in the leaves. A decrease in nitrogen content in stems and leaves and in phosphorus and potassium concentrations in roots were observed especially in the White ipe plants. Our results demonstrated that roots and leaves of Ipe plants accumulate high concentrations of Zn, which evidences the potential of these species as candidates for bioremediation in Zn-polluted Cerrado areas. |
| Databáze: | OpenAIRE |
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