Streptomycin affects the growth and photochemical activity of the alga Chlorella vulgaris

• Published in: Ecotoxicology and environmental safety Vol. 132; pp. 311 - 317
• Main Authors: Perales-Vela, Hugo Virgilio, García, Roberto Velasco, Gómez- Juárez, Evelyn Alicia, Salcedo-Álvarez, Martha Ofelia, Cañizares-Villanueva, Rosa Olivia
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Inc 01.10.2016
• Subjects: Chlorella vulgaris; Chlorella vulgaris - drug effects; Chlorophyll - metabolism; Chlorophyll a fluorescence; Electron Transport - drug effects; Environmental Monitoring - methods; Fluorescence; Microalgae growth; Oxidation-Reduction; Photosynthesis; Photosynthesis - drug effects; Photosystem I Protein Complex - metabolism; Photosystem II Protein Complex - metabolism; Streptomycin; Streptomycin - toxicity; Water Pollutants, Chemical - toxicity; Microalgae growth; Chlorophyll a fluorescence; Streptomycin; Photosynthesis
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2016.06.019

Antibiotics are increasingly being used in human and veterinary medicine, as well as pest control in agriculture. Recently, their emergence in the aquatic environment has become a global concern. The aim of this study was to evaluate the effect of streptomycin on growth and photosynthetic activity of Chlorella vulgaris after 72h exposure. We found that growth, photosynthetic activity and the content of the D1 protein of photosystem II decreased. Analysis of chlorophyll a fluorescence emission shows a reduction in the energy transfer between the antenna complex and reaction center. Also the activity of the oxygen evolution complex and electron flow between QA and QB were significantly reduced; in contrast, we found an increase in the reduction rate of the acceptor side of photosystem I. The foregoing can be attributed to the inhibition of the synthesis of the D1 protein and perhaps other coded chloroplast proteins that are part of the electron transport chain which are essential for the transformation of solar energy in the photosystems. We conclude that micromolar concentrations of streptomycin can affect growth and photosynthetic activity of Chlorella vulgaris. The accumulation of antibiotics in the environment can become an ecological problem for primary producers in the aquatic environment. •Exposure to streptomycin reduces.•The autotrophic growth of C. vulgaris.•The content of D1-PSII protein and photosynthetic pigments.•The function of oxygen-evolving complex and the electron transport.