Relationship between morphospecies and microcystinproducing genotypes of <i>Microcystis</i> species in Chinese freshwaters -- Journal of Oceanology and Limnology,2021,39(5):1926-1937

	Cite this paper:
	Yang LIU, Youxin CHEN, Haiyan FANG, Hanyang LU, Xingqiang WU, Gongliang YU, Shin-ichi NAKANO, Renhui LI. Relationship between morphospecies and microcystinproducing genotypes of Microcystis species in Chinese freshwaters[J]. Journal of Oceanology and Limnology, 2021, 39(5): 1926-1937

Relationship between morphospecies and microcystinproducing genotypes of Microcystis species in Chinese freshwaters

Yang LIU^1,5, Youxin CHEN², Haiyan FANG¹, Hanyang LU¹, Xingqiang WU², Gongliang YU², Shin-ichi NAKANO³, Renhui LI⁴

1 College of Life Science, Henan Normal University, Xinxiang 453007, China;
2 Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;
3 Center for Ecological Research, Kyoto University, Shiga 520-2113, Japan;
4 College of Life and Environmental Sciences, Wenzhou University, Wenzhou 325000, China;
5 Journal of Henan Normal University, Xinxiang 453007, China

Abstract:

Twenty water bodies in China were sampled, and 186 strains of different Microcystis species were isolated, from which eight morphospecies were identified and 43 stains containing the mcyB gene were detected. Phylogenetic analysis based on the mcyB gene indicated that the microcystin (MC)-producing Microcystis in China could be divided into two groups (I and II) and showed significant differences between the two groups. The maximum sequence similarity was 69.1%. Microcystins (MCs) were measured by high-performance liquid chromatography (HPLC) analysis, and no microcystin-RR (MC-RR) was detected in some strains belonging to Group II. Compared to other regions of the world, the proportion of Chinese MC-producing Microcystis was different, and the regional differences were more obvious. A whole-cell polymerase chain reactio (PCR) assay was conducted to analyze the proportion of the mcyB gene in the laboratory cultured and field cultured Microcystis. The proportion of four morphospecies (M. vividis, M. ichthyoblabe, M. novacekii, and M. aeruginosa) that contained the mcyB gene exceeded 50% in the field cultured samples. Compared with former studies, M. aeruginosa was the most likely morphotype that can produce MCs in the world. This study provided new insight of Microcystis hazard assessment and field monitoring.

Received: 2020-07-22 Revised: 2020-09-29

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Articles by Youxin CHEN

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Articles by Gongliang YU

Articles by Shin-ichi NAKANO

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