Laboratorio de Bioquímica.Unidad de Morfología y Función. Facultad de Estudios Superiores Iztacala. Universidad Nacional Autónoma de México. Los Reyes Iztacala, Ave. de Los Barrios #1. Estado de México, C.P. 54090, Mexico.
Cátedra Conacyt, Comisionado a La Maestría en Sistemas Ambientales. TecNM/ Instituto Tecnológico de Durango. Departamento de Ingenierías Química y Bioquímica. Blvd, Felipe Pescador 1830, Nueva Vizcaya, 34080, Durango, Dgo, Mexico.
Chemosphere. 2021 Oct;281:130750. doi: 10.1016/j.chemosphere.2021.130750. Epub 2021 May 13.
Aquatic environments are especially susceptible to being contaminated by pesticides used in agricultural fields. Methyl viologen (MV) is an herbicide with high effectiveness for the control of unwanted land plants; however, it also has a high toxicity towards the algae in the aquatic environment. The objective of this work was to describe the effect of MV on photosynthetic metabolism and its relationship with respiration, growth and the content of photosynthetic pigments of Chlorella vulgaris. The cultures of C. vulgaris were exposed for 72 h at different concentrations of methyl viologen. The results show that growth, pigment content and metabolic activity decrease as the concentration of MV increases. Analysis of the photochemical activity indicates that MV produces an inhibition of electron transport between quinone A and quinone B of photosystem II. The inhibition of photosynthetic electron transport is directly related to the reduction of metabolic activity and cell growth. The results found in this research show that methyl viologen can be a toxic pollutant for primary producers in aquatic environments.
水生环境特别容易受到农业领域使用的农药的污染。甲紫（MV）是一种用于控制不需要的陆地植物的高效除草剂；然而，它对水生环境中的藻类也有很高的毒性。本工作的目的是描述 MV 对光合作用代谢的影响及其与呼吸作用、生长和叶绿素含量的关系。在不同浓度的甲紫作用下，培养了 72 小时的普通小球藻。结果表明，随着 MV 浓度的增加，生长、色素含量和代谢活性下降。光化学活性分析表明，MV 对光合作用系统 II 中醌 A 和醌 B 之间的电子传递产生抑制作用。光合电子传递的抑制与代谢活性和细胞生长的降低直接相关。本研究的结果表明，甲紫可能是水生环境中初级生产者的有毒污染物。
