Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8886938 | Environmental and Experimental Botany | 2018 | 39 Pages |
Abstract
Exposure to cadmium (Cd) can cause oxidative stress and injuries to the photosynthetic apparatus of plants. Otherwise, plant metabolism impaired by Cd toxicity can be aided by a proper sulfur (S) nutrition, since S is a component of antioxidants and photosynthetic systems. In this sense, our aim in this study was to evaluate the effect of S supply (0.1, 1.9 and 3.7âmmol Lâ1) on the antioxidant and photosynthetic systems of Massai grass exposed to Cd (0.0, 0.1 and 0.5âmmol Lâ1) as a prerequisite for studies of Cd phytoextraction. Plants supplied with 3.7âmmol Lâ1 S showed the lowest growth and the highest Cd concentrations when exposed to 0.5âmmol Lâ1 Cd. However, Massai grass grown without S deprivation showed the highest GSHâ+âGSSG concentrations in all tissues and the lowest lipid peroxidation in stems and sheaths and roots. In general, the activities of SOD, CAT, APX, GPOX and GR did not increase in Massai grass exposed to Cd, even with proper S supply. Severe Cd exposure halted the photosynthetic system of Massai grass, although well-nourished plants with S exhibited greatest photosynthetic rate probably due to the action of GSH in the control of the oxidative stress.
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Authors
Flávio Henrique Silveira Rabêlo, Berenice Kussumoto de Alcântara da Silva, Lucélia Borgo, Els Keunen, Mônica Lanzoni Rossi, Karina Lima Reis Borges, Elcio Ferreira dos Santos, André Rodrigues dos Reis, Adriana Pinheiro Martinelli,