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Plant function and evolutionary biology
RESEARCH ARTICLE

Physiological responses of the microalgae Thalassiosira weissflogii to the presence of the herbicide glyphosate in the medium

Ekaterina Solomonova https://orcid.org/0000-0001-5373-4954 A * , Natalia Shoman https://orcid.org/0000-0002-0924-1244 A and Arkady Akimov https://orcid.org/0000-0001-8583-1468 A
+ Author Affiliations
- Author Affiliations

A A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Avenue, Sevastopol, Russian Federation.

* Correspondence to: solomonov83@mail.ru

Handling Editor: Vadim Demidchik

Functional Plant Biology 51, FP23205 https://doi.org/10.1071/FP23205
Submitted: 6 September 2023  Accepted: 7 April 2024  Published: 26 April 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

We evaluated changes in growth, chlorophyll fluorescence and basic physiological and biochemical parameters of the microalgae Thalassiosira weissflogii cells under the influence of the herbicide glyphosate in concentrations 0, 25, 95 and 150 μg L−1. The toxic effect of glyphosate on algae is weakly dependent on the level of cell mineral nutrition. High concentrations of the herbicide do not lead to the death of microalgae but block the process of algae cell division. An increase in the glyphosate concentration in the medium leads to a slowdown or stop of algal growth, a decrease in their final biomass, an increase in the production of reactive oxygen species (ROS), depolarisation of mitochondrial membranes and metabolic activity of algae. Glyphosate inhibits the photosynthetic activity of cells and inhibits the relative rate of electron transport in the photosynthetic apparatus. Glyphosate at the studied concentrations does not affect the size characteristics of cells and the intracellular content of chlorophyll in T. weissflogii. The studied herbicide or products of its decay retain their toxic properties in the environment for at least 9 days. This result shows the need for further in-depth studies to assess the physiological response and possible acclimation changes in the functional state of oxygenic phototrophs in response to the herbicide action. The species specificity of microalgae to the effects of glyphosate in natural conditions is potentially dangerous due to a possible change in the species structure of biocoenoses, in particular, a decrease in the contribution of diatoms.

Keywords: algae, ecotoxicology, flow cytometry, growth, herbicides toxicity, photosynthetic activity, plankton algae, pollution.

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