College of Resources, Sichuan Agricultural University, Chengdu 611130, China; Department of Chemistry, Université de Montréal, 1375 Avenue Thérèse-Lavoie-Roux, Montréal, QC H2V 0B3, Canada.
Department of Chemistry, Université de Montréal, 1375 Avenue Thérèse-Lavoie-Roux, Montréal, QC H2V 0B3, Canada.
Sci Total Environ. 2022 Mar 1;810:152104. doi: 10.1016/j.scitotenv.2021.152104. Epub 2021 Dec 2.
Global warming and eutrophication may lead to increased incidence of harmful algal blooms and related production of cyanotoxins that can be toxic to aquatic plants. Previous studies have evaluated the phytotoxic effects of cyanotoxins on aquatic plants. However, most studies have evaluated only a limited number of plant species and cyanotoxins; there is also considerable variability between studies, which obscures general patterns and hinders understanding of the phytotoxic effects of cyanotoxins. Here, we conducted a comprehensive meta-analysis by compiling 41 published papers to estimate the phytotoxic effects of anatoxin-a, cylindrospermopsin, and microcystins in 34 species of aquatic plants, with the aim of 1) investigating the phytotoxicity of different cyanotoxins to aquatic plants; 2) determining the aquatic plant species most sensitive to the phytotoxic effects of cyanotoxins; and 3) evaluating the bioaccumulation potential of cyanotoxins in aquatic plants. Most aquatic plants were negatively affected by cyanotoxin exposure and their response was dose-dependent; however, morphological indicators and photosynthesis of certain aquatic plants were marginally stimulated under low concentrations of anatoxin-a and cylindrospermopsin. Anatoxin-a showed the greatest bioaccumulation capacity in aquatic plants compared to cylindrospermopsin and microcystin variants. Bioaccumulation factors of cyanotoxins in aquatic plants generally decreased with increasing water exposure concentrations. Our study supports the One Health goal to manage the risk of public exposure to toxic substances, and indicates that cyanotoxins warrant further investigations in aquatic plants. Environmental managers and public health authorities need to be alert to the long-term exposure and chronic toxicity of cyanotoxins, and the potential trophic transfer of cyanotoxins from aquatic plants to higher-order organisms.
全球变暖与富营养化可能导致有害藻类大量繁殖，以及与藻类有关的微囊藻毒素等的产生，这些毒素可能对水生植物有毒害作用。先前的研究已经评估了微囊藻毒素对水生植物的植物毒性效应。然而，大多数研究仅评估了有限数量的植物物种和微囊藻毒素；不同研究之间也存在相当大的变异性，这掩盖了一般模式，阻碍了对微囊藻毒素植物毒性效应的理解。在这里，我们通过汇编 41 篇已发表的论文进行了一项综合的荟萃分析，以评估 34 种水生植物中鱼腥藻毒素-a、柱孢藻毒素和微囊藻毒素的植物毒性效应，目的是：1）研究不同微囊藻毒素对水生植物的毒性；2）确定对微囊藻毒素植物毒性最敏感的水生植物物种；3）评估微囊藻毒素在水生植物中的生物累积潜力。大多数水生植物受到微囊藻毒素暴露的负面影响，其反应是剂量依赖性的；然而，在低浓度的鱼腥藻毒素-a 和柱孢藻毒素下，某些水生植物的形态指标和光合作用受到轻微刺激。与柱孢藻毒素和微囊藻毒素变体相比，鱼腥藻毒素-a 在水生植物中表现出最大的生物累积能力。水生植物中微囊藻毒素的生物累积因子通常随水暴露浓度的增加而降低。我们的研究支持“同一健康”目标，即管理公众接触有毒物质的风险，并表明微囊藻毒素值得进一步在水生植物中进行研究。环境管理者和公共卫生当局需要警惕微囊藻毒素的长期暴露和慢性毒性，以及微囊藻毒素从水生植物向更高营养级生物的潜在营养转移。
