Mechanisms of copper stress alleviation in Citrus trees after metal uptake by leaves or roots

Environmental Science and Pollution Research International
Franz Walter Rieger HipplerDirceu Mattos-Jr

Abstract

Nutritional disorders caused by copper (Cu) have affected citrus orchards. Since Cu is foliar sprayed as a pesticide to control citrus diseases, this metal accumulates in the soil. Thereby, we evaluated the effects of Cu leaf absorption after spray of different metal sources, as well as roots absorption on growth, nutritional status, and oxidative stress of young sweet orange trees. Two experiments were carried out under greenhouse conditions. The first experiment was set up with varying Cu levels to the soil (nil Cu, 0.5, 2.0, 4.0 and 8.0 g of Cu per plant as CuSO4.5H2O), whereas the second experiment with Cu application via foliar sprays (0.5 and 2.0 g of Cu per plant) and comparing two metal sources (CuSO4.5H2O or Cu(OH)2). Copper was mainly accumulated in roots with soil supply, but an increase of oxidative stress levels was observed in leaves. On the other hand, Cu concentrations were higher in leaves that received foliar sprays, mainly as Cu(OH)2. However, when sulfate was foliar sprayed, plants exhibited more symptoms of injuries in the canopy with decreased chlorophyll contents and increased hydrogen peroxide and lipid peroxidation levels. Copper toxicity was characterized by sap leakage from the trunk and twigs, which ...Continue Reading

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Jan 28, 2018·Scientific Reports·Franz Walter Rieger HipplerDirceu Mattos-Jr

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Citations

Jul 7, 2019·Environmental Science and Pollution Research International·Karina Lima Reis BorgesRicardo Antunes Azevedo
Aug 8, 2020·MicrobiologyOpen·Lúcia B CavalcaHenrique Ferreira
Jul 28, 2018·Environmental Science and Pollution Research International·Fernando Angelo PiottoRicardo Antunes Azevedo

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