Effects of copper and lead exposure on the ecophysiology of the brown seaweed Sargassum cymosum

Protoplasma
Giulia B CostaEder C Schmidt

Abstract

The effects of the heavy metals copper (Cu) and lead (Pb) on Sargassum cymosum were evaluated by determining uptake capacity, growth rates, photosynthetic efficiency, contents of photosynthetic pigments and phenolic compounds, 2,2-diphenyl-1-picrylhydrazyl radical-scavenging capacity, and morphological and cellular changes. S. cymosum was cultivated with Cu and Pb separately and combined at concentrations of 10, 25, and 50 μM for 7 days in laboratory-controlled conditions. Seaweeds under Cu treatment showed the highest biosorption capacity, and growth rates were significantly reduced compared to the control. The photosynthesis/irradiance curves showed alterations in kinetic patterns in the metal-treated samples. Specifically, Cu treatment alone inhibited electron transport rate (ETR) response, while Pb alone induced it. However, samples treated with both Cu and Pb (Cu + Pb) showed inhibition in ETR. The total amount of pigments increased relative to control. Light microscopy showed an increase in phenolic compounds, with physodes migrating towards cortical cells. Scanning electronic microscopy revealed alterations in the typical rough surface of thallus, when compared with control, especially for Pb treatments. Based on these r...Continue Reading

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Citations

Oct 30, 2016·Bioresource Technology·Yue WangJo-Shu Chang
Feb 15, 2018·Environmental Science and Pollution Research International·Fernando SchernerPaulo Antunes Horta
Jul 3, 2020·Biological Reviews of the Cambridge Philosophical Society·Mariana Mayer-PintoEmma L Johnston
Apr 1, 2018·Environmental Science and Pollution Research International·Yaoru PanXi Xiao
Nov 17, 2019·Environmental Science and Pollution Research International·Giulia Burle CostaPaulo A Horta

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