Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/105769
Title: Glyphosate-Based Herbicide Toxicophenomics in Marine Diatoms: Impacts on Primary Production and Physiological Fitness
Authors: Cruz de Carvalho, Ricardo
Feijão, Eduardo
Matos, Ana Rita 
Cabrita, Maria Teresa
Novais, Sara C.
Lemos, Marco F. L. 
Caçador, Isabel 
Marques, João Carlos 
Reis-Santos, Patrick 
Fonseca, Vanessa F.
Duarte, Bernardo 
Keywords: photobiology; energetic metabolism; pesticide; oxidative stress; glyphosate
Issue Date: 2020
Publisher: MDPI
Project: PTDC/CTA-AMB/30056/2017 (OPTOX) 
UID/MAR/04292/2019 
UID/MULTI/04046/2019 
Integrated Programme of SR&TD SmartBioR (reference Centro-01-0145-FEDER-000018), co-funded by Centro 2020 program, Portugal 2020, European Union, through the European Regional Development Fund 
CEECIND/00511/2017 
DL57/2016/CP1479/CT0024) 
SFRH/BPD/95784/2013 
Serial title, monograph or event: Applied Sciences (Switzerland)
Volume: 10
Issue: 21
Abstract: Glyphosate is the main active component of the commercial formulation Roundup®, the most widely used chemical herbicide worldwide. However, its potential high toxicity to the environment and throughout trophic webs has come under increasing scrutiny. The present study aims to investigate the application of bio-optical techniques and their correlation to physiological and biochemical processes, including primary productivity, oxidative stress, energy balance, and alterations in pigment and lipid composition in Phaeodactylum tricornutum, a representative species of marine diatoms, using the case study of its response to the herbicide glyphosate-based Roundup® formulation, at environmentally relevant concentrations. Cultures were exposed to the herbicide formulation representing e ective glyphosate concentrations of 0, 10, 50, 100, 250, and 500 g L􀀀1. Results showed that high concentrations decreased cell density; furthermore, the inhibition of photosynthetic activity was not only caused by the impairment of electron transport in the thylakoids, but also by a decrease of antioxidant capacity and increased lipid peroxidation. Nevertheless, concentrations of one of the plastidial marker fatty acids had a positive correlation with the highest concentration as well as an increase in total protein. Cell energy allocation also increased with concentration, relative to control and the lowest concentration, although culture growth was inhibited. Pigment composition and fatty acid profiles proved to be e cient biomarkers for the highest glyphosate-based herbicide concentrations, while bio-optical data separated controls from intermediate concentrations and high concentrations.
URI: https://hdl.handle.net/10316/105769
ISSN: 2076-3417
DOI: 10.3390/app10217391
Rights: openAccess
Appears in Collections:I&D MARE - Artigos em Revistas Internacionais

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