Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 106, Issue -, Pages 253-263Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2016.05.015
Keywords
Acid soils; Cu- and Zn-based fungicides; Potentially toxic elements; Antioxidant enzymes; Photosynthetic pigments
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Funding
- Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (Foundation for Research Support of the State of Rio Grande do Sul)-FAPERGS [1971-2551/13-2]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (Brazilian National Council for Scientific and Technological Development)-CNPq [473376/2013-0]
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Vineyard sandy acid soils from South Brazil have experienced heavy metal contamination due to replacement of copper (Cu)-based by zinc (Zn)-based products to control foliar diseases. Thus, we evaluate physiological and nutritional status of black oat (Avena strigosa Schreb.), a common interrow crop in vineyards from this region. Soil was collected in a natural field from Santana do Livramento, in Rio Grande do Sul, the southernmost state of Brazil. Black oat was cultivated for 30 days in a greenhouse with application of 0, 30, and 60 mg Cu kg(-1) combined with 0, 15, 30, 60, 120, and 180 mg Zn kg(-1). After the trial period, dry matter accumulation of roots and shoots, Cu and Zn contents in roots and shoots, chlorophyll a fluorescence, photosynthetic pigments and catalase (CAT, EC 1.11.1.6) and peroxidase (POD, EC 1.11.1.7) activity were determined. Cu and Zn toxicity was evidenced by the decrease in plant growth of black oat as well as by the decrease of photochemical efficiency associated with the decrease in photosynthetic pigment content, especially with the highest doses of Cu and Zn. Furthermore, the activity of antioxidant enzymes (CAT and POD) was increased in intermediate doses of Zn, indicating the activation of the antioxidant system, but the stress condition in treatments with high levels of Cu and Zn was not reversed. (C) 2016 Elsevier Masson SAS. All rights reserved.
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