Dynamics of the prokaryotic and eukaryotic microbial community during a cyanobacterial bloom.
Dynamics of the prokaryotic and eukaryotic microbial community during a cyanobacterial bloom.
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蓝藻水华期间原核和真核微生物群落的动态。
DOI：
10.1093/bbb/zbab179
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
K. Shimizu
中科院分区：
文献类型：
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作者：
Yilin Qian;K. Okano;Miwa Kodato;Michiko Arai;Takeru Yanagiya;Qintong Li;C. Amano;K. Ruike;T. Itayama;N. Iwami;M. Utsumi;Z. Lei;Zhenya Zhang;N. Sugiura;K. Shimizu
有毒蓝藻水华经常在世界范围内的富营养化淡水水体中发展。微囊藻产生的微囊藻毒素是一种蓝藻毒素。某些携带mlr基因簇的细菌，特别是mlrA，能够降解MC。然而，MCs降解细菌可能具有或缺乏mlr基因（分别为mlr+和mlr-基因型）。在这项研究中，我们调查的基因型，主要是有助于生物降解和蓝藻捕食者群落结构的变化，在水环境中的总MCs浓度。两种基因型共存，但mlr+占主导地位，如mlrA基因拷贝丰度和总MCs浓度之间的负相关性所示。在最高的MCs浓度，捕食压力由Phyllopoda，桡足类，和Monogononta（轮虫）减少，因此，MCs可能是有毒的蓝藻捕食者。结果表明，MCs降解细菌和捕食者之间的合作可能会降低微囊藻的丰度和MCs的浓度。
Toxic cyanobacterial blooms frequently develop in eutrophic freshwater bodies worldwide. Microcystis species produce microcystins (MCs) as a cyanotoxin. Certain bacteria that harbor the mlr gene cluster, especially mlrA, are capable of degrading MCs. However, MCs-degrading bacteria may possess or lack mlr genes (mlr+ and mlr- genotypes, respectively). In this study we investigated the genotype that predominantly contributes to biodegradation and cyanobacterial predator community structure with change in total MCs concentration in an aquatic environment. The two genotypes co-existed but mlr+ predominated, as indicated by the negative correlation between mlrA gene copy abundance and total MCs concentration. At the highest MCs concentrations, predation pressure by Phyllopoda, Copepoda, and Monogononta (rotifers) was reduced; thus, MCs may be toxic to cyanobacterial predators. The results suggest cooperation between MCs-degrading bacteria and predators may reduce Microcystis abundance and MCs concentration.