Morphological characteristics and phylogenetic relationship of <Emphasis Type="Italic">Anabaena</Emphasis> species from Lakes Dianchi and Erhai,China |
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Authors: | Xiaojie Pan Fengyi Chang Lijuan Kang Genbao Li Dunhai Li Yongding Liu Yinwu Shen Zhihong Wei |
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Institution: | (1) State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, People’s Republic of China;(2) Institute of Hydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan, 430079, People’s Republic of China;(3) Graduate School of Chinese Academy of Science, Beijing, 100039, People’s Republic of China;(4) Shanghai Academy of Environmental Sciences, Shanghai, 200233, People’s Republic of China;(5) Chinese Research Center of Lake Erhai, Dali, 671000, People’s Republic of China; |
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Abstract: | Although Anabaena is one of the most prevalent planktonic freshwater genus in China, there are few taxonomic reports of Anabaena strains by morphology and genetics. In this study, morphological characteristics and phylogenetic relationships of seven
Anabaena strains isolated from two plateau lakes, Lakes Dianchi and Erhai, were investigated. Morphological characteristics such as
morphology of filament, cellular shapes and sizes, relative position of heterocytes and akinetes, and presence or absence
of aerotopes, were described for these seven strains. Phylogenetic relationships were determined by constructing 16S rRNA
gene tree using the neighbor-joining algorithm. The seven strains were morphologically identified as three groups, and phylogenetic
analysis based on 16S rRNA gene sequences also showed that these seven strains were in three groups. Strains EH-2, EH-3, and
EH-4 were in group A belonging to the Anabaena circinalis and A. crassa group, and strains DC-1, DC-2, and EH-1 were in group B and identified as A. flos-aquae. Strain DC-3 without aerotopes was significantly different from the other isolated strains and was determined as A. cylindrica.
Handling editor: J. Padisak |
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Keywords: | Morphological characteristics Phylogenetic relationship 16S rRNA Anabaena Plateau lakes |
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