Testing the Effectiveness of DNA Barcoding Markers and Species Delimitation Methods Within the Genus Coelastrella (Sphaeropleales, Chlorophyta), With a Description of Coelastrella polaris sp. nov. Isolated from Arctic Soils.

IF 2.3 3区 生物学 Q3 MICROBIOLOGY
E Krivina, M Sinetova, A Starikov, O Anissimova, A Temraleeva
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Abstract

The species diversity in the genus Coelastrella is not yet fully unclarified, particularly with regard to algal communities in ecosystems characterized by extreme climatic conditions, such as those found in polar regions. The study objects were strains VKM Al-421, VKM Al-488, and VKM Al-489 isolated from the soils of the Far North, Russian Federation. The analysis of the 18S-ITS1-5.8S-ITS2 fragment revealed that these strains represent a unique phylogenetic lineage outside the 'core Coelastrella' group. The species status is also confirmed by morphological differences between the studied species and its sister species (absence of edges) (lack of ribs), interspecific genetic distances, the presence of compensatory base changes in the internal transcribed spacers ITS1 and ITS2, as well as the results of delimitation using various algorithms applied to both the full-length fragment and shorter barcodes. The strain VKM Al-421 of the new species exhibits a fatty acid profile characteristic of the genus Coelastrella; however, it differs from closely related strains due to the presence of Δ7,10,13-hexadecatrienoic acid and a notably high concentration of α-linolenic acid. These features may indicate an adaptation to polar regions. In addition, the studied strain has the potential to be used as a producer of α-linolenic acid, which is essential for human health. A detailed comparative analysis of the effectiveness of different DNA barcodes showed that ITS2 is the most promising for distinguishing species within Coelastrella. Among all species delimitation algorithms, GMYC is the most accurate when working with variable barcodes. At the same time, the less laborious KoT algorithm demonstrated a similar level of accuracy for ITS1.

蓝藻属(Sphaeropleales,绿藻门)DNA条形码标记和物种划分方法的有效性检验——以北极土壤中分离的北极蓝藻为例。
Coelastrella属的物种多样性尚未完全清楚,特别是关于极端气候条件下生态系统中的藻类群落,例如在极地地区发现的藻类群落。研究对象为从俄罗斯联邦远北地区土壤中分离的菌株VKM Al-421、VKM Al-488和VKM Al-489。对18S-ITS1-5.8S-ITS2片段的分析表明,这些菌株在“核心Coelastrella”类群之外具有独特的系统发育谱系。物种地位也被研究物种与其姊妹物种之间的形态差异(没有边缘)(缺乏肋骨),种间遗传距离,内部转录间隔物ITS1和ITS2中代偿碱基变化的存在以及使用各种算法对全长片段和较短条形码进行划分的结果所证实。新种菌株VKM Al-421的脂肪酸谱表现出Coelastrella属的特征;然而,由于存在Δ7,10,13-十六烯酸和高浓度的α-亚麻酸,它与密切相关的菌株不同。这些特征可能表明对极地地区的适应。此外,所研究的菌株具有作为α-亚麻酸的生产者的潜力,这是人类健康所必需的。对不同DNA条形码的有效性进行了详细的比较分析,结果表明ITS2是最有希望用于区分Coelastrella内物种的条形码。在所有物种划分算法中,GMYC在处理可变条形码时是最准确的。与此同时,较少费力的KoT算法对ITS1显示出相似的精度水平。
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来源期刊
Current Microbiology
Current Microbiology 生物-微生物学
CiteScore
4.80
自引率
3.80%
发文量
380
审稿时长
2.5 months
期刊介绍: Current Microbiology is a well-established journal that publishes articles in all aspects of microbial cells and the interactions between the microorganisms, their hosts and the environment. Current Microbiology publishes original research articles, short communications, reviews and letters to the editor, spanning the following areas: physiology, biochemistry, genetics, genomics, biotechnology, ecology, evolution, morphology, taxonomy, diagnostic methods, medical and clinical microbiology and immunology as applied to microorganisms.
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