Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30387 Krakow, Poland.
Department of Hydrobiology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland.
FEMS Microbiol Ecol. 2019 Nov 1;95(11). doi: 10.1093/femsec/fiz162.
Microcystins produced by several toxic cyanobacterial strains constitute an important problem for public health. Bacterial degradation of these hepatotoxins may play an important role in natural ecosystems, however the nature of the process is very poorly understood. The aim of our study was to investigate the possible interactions between cyanotoxin producers and degraders. Samples collected from 24 water bodies in western Poland were analysed to determine the chemo-physical parameters, phytoplankton content, bacterial community structure and microcystin-biodegradation potency. A redundancy analysis identified a positive correlation between the capacity of a community to degrade microcystin LR (MC-LR) and temperature, pH, chlorophyll a concentration and the abundance of MC-producers. The relative abundance of classes F38, TM7-3 and the order WCHB1-81c (Actinobacteria) was significantly higher in the lakes with MC-biodegradation potency. Some specific bacterial genera belonging to Acidobacteria, Chloroflexi, Gemmatimonadetes, Firmicutes and TM7 were closely correlated with the occurrence of Microcystis spp. Furthermore, the MC biodegradation process was connected with the same bacterial groups. Thus, our approach allowed us to provide a broader picture of some specific relations between microcystin producers and potential microcystin degraders. A more comprehensive analysis of the existing correlations may be helpful in our understanding of natural mechanisms of MC elimination using bacteria such as MC-degraders.
由几种有毒蓝藻菌株产生的微囊藻毒素是公共卫生的一个重要问题。这些肝毒素的细菌降解可能在自然生态系统中发挥重要作用，但该过程的性质知之甚少。我们的研究旨在调查蓝藻毒素生产者和降解者之间可能存在的相互作用。对从波兰西部的 24 个水体采集的样本进行了分析，以确定化学物理参数、浮游植物含量、细菌群落结构和微囊藻毒素生物降解能力。冗余分析确定了群落降解微囊藻毒素 LR (MC-LR) 的能力与温度、pH 值、叶绿素 a 浓度和 MC 生产者丰度之间呈正相关。在具有微囊藻毒素生物降解能力的湖泊中，F38、TM7-3 和 WCHB1-81c 目（放线菌）类的相对丰度显著较高。属于 Acidobacteria、Chloroflexi、Gemmatimonadetes、Firmicutes 和 TM7 的一些特定细菌属与微囊藻属的出现密切相关。此外，微囊藻毒素生物降解过程与相同的细菌群有关。因此，我们的方法使我们能够更全面地了解微囊藻毒素生产者和潜在微囊藻毒素降解者之间的一些特定关系。对现有相关性的更全面分析可能有助于我们了解利用 MC 降解菌等细菌消除 MC 的自然机制。
