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Issue: Vol. 678 No. 2: 27 Dec. 2024
Type: Article
Published: 2024-12-27
DOI: 10.11646/phytotaxa.678.2.1
Page range: 96-108
Abstract views: 57
PDF downloaded: 4

Description of a novel filamentous cyanobacterial species of Leptodesmis (Leptolyngbyaceae, Cyanobacteria) in China based on the polyphasic approach

Henan International Joint Laboratory of Aquatic Ecotoxicology and Health Protection, Xinxiang, 453007, China. College of Life Sciences, Henan Normal University, Xinxiang, 453007, China. Observation and Research Station on Water Ecosystem in Danjiangkou Reservoir of Henan Province, Nanyang 474450, China.
Henan International Joint Laboratory of Aquatic Ecotoxicology and Health Protection, Xinxiang, 453007, China. College of Life Sciences, Henan Normal University, Xinxiang, 453007, China.
Henan International Joint Laboratory of Aquatic Ecotoxicology and Health Protection, Xinxiang, 453007, China. College of Life Sciences, Henan Normal University, Xinxiang, 453007, China.
Ecological Environment Monitoring and Scientific Research Center, Taihu Basin & East China Sea Ecological Environment Supervision and Administration Bureau, Ministry of Ecology and Environment, Shanghai 200125, China
Henan International Joint Laboratory of Aquatic Ecotoxicology and Health Protection, Xinxiang, 453007, China. College of Life Sciences, Henan Normal University, Xinxiang, 453007, China.
filamentous cyanobacteria Leptodesmis xinxiangensis polyphasic taxonomy The middle route of the South-to-North Water Diversion Project Algae

Abstract

The middle route of the South-to-North Water Diversion Project supplies high-quality water to various water treatment plants along its path and increases the diversity of cyanobacteria present in the raw water. A filamentous cyanobacterium Leptodesmis xinxiangensis HNU2023 was successfully isolated from a drinking water plant in Xinxiang, which receives its water supply from this middle route. Morphologically, this strain exhibits similarities to cyanobacterial taxa within the genera Leptodesmis and Phormidesmis. Phylogenetic analysis, based on 16S rRNA gene sequences, indicates that this strain is closely related to Leptodesmis, forming a well-supported clade. The 16S rRNA gene sequences of the strain show between 95.5% and 98% similarity to known Leptodesmis species, suggesting that it represents a new species within this genus. Moreover, the distinctive patterns observed in the D1-D1′ and Box-B helix regions of the 16S–23S rRNA internal transcribed spacer (ITS) secondary structure further confirm that this strain is a novel species. Consequently, the comprehensive analysis of the isolated strain, in conjunction with morphological characteristics, 16S rRNA gene sequencing, and ITS secondary structure, substantiates the classification of Leptodesmis xinxiangensis sp. nov. as a new species within the genus Leptodesmis.

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