Scholarlink

<p>Despite extensive research on the <i>Chlorella</i>-like microalgae (Trebouxiophyceae, Chlorophyta), the species richness of this group in a number of regions is still underestimated. This is particularly valid for the Arctic region. Meanwhile, microalgae from such extreme habitats should have unique adaptations for survival in extreme environmental conditions, which could lead to their potential biotechnological applications. This paper describes a new genus within the <i>Chlorella clade</i> that was isolated from freshwater reservoirs in the Arctic region (Russian Federation). The studied strains IPPAS C-1542 and IPPAS C-2075 had the morphology of a typical “small green ball.” Moreover, their morphological traits remain invariant irrespective of the presence of algal predators of the genus <i>Brachionus</i>. However, the 18S–ITS1–5.8S–ITS2 sequence analyses indicated that they formed a phylogenetic lineage that was independent of taxonomically recognized genera. The taxonomic status of the new genus was also confirmed by a unique molecular signature in the V8 region of the 18S rRNA gene and genetic distances between 18S–ITS1 and 5.8S–ITS2 sequences. A description of the studied strain IPPAS C-2075 was provided as an authentic strain of the type species <i>Hoshinaea borealis</i> gen. et sp. nov<i>.</i> E.Krivina, E.Giulmisarian, A.Starikov and M.Sinetova. An analysis of the fatty acid composition revealed that the cells of <i>Hoshinaea borealis</i> adapt to low temperatures by accumulating <i>α</i>-linolenic and 7,10,13-hexadecatrienoic acids and inducing the synthesis of 4,7,10,13-hexadecatetraenoic acid. The latter fatty acid is rare in the <i>Chlorella</i> clade, and in this work, we report for the first time the induction of its biosynthesis by low temperature.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A new Chlorella-like microalgae Hoshinaea borealis gen. et sp. nov. (Trebouxiophyceae, Chlorophyta) from Arctic ecosystems

  • 期刊论文

  • 发表日期：

    2026年4月12日

查看全文
  • Elena Krivina,
  • Elizaveta Giulmisarian,
  • Alexander Starikov,
  • Anastasia Krapivina,
  • Alexander Tyurin,
  • Maria Sinetova

摘要

Despite extensive research on the Chlorella-like microalgae (Trebouxiophyceae, Chlorophyta), the species richness of this group in a number of regions is still underestimated. This is particularly valid for the Arctic region. Meanwhile, microalgae from such extreme habitats should have unique adaptations for survival in extreme environmental conditions, which could lead to their potential biotechnological applications. This paper describes a new genus within the Chlorella clade that was isolated from freshwater reservoirs in the Arctic region (Russian Federation). The studied strains IPPAS C-1542 and IPPAS C-2075 had the morphology of a typical “small green ball.” Moreover, their morphological traits remain invariant irrespective of the presence of algal predators of the genus Brachionus. However, the 18S–ITS1–5.8S–ITS2 sequence analyses indicated that they formed a phylogenetic lineage that was independent of taxonomically recognized genera. The taxonomic status of the new genus was also confirmed by a unique molecular signature in the V8 region of the 18S rRNA gene and genetic distances between 18S–ITS1 and 5.8S–ITS2 sequences. A description of the studied strain IPPAS C-2075 was provided as an authentic strain of the type species Hoshinaea borealis gen. et sp. nov. E.Krivina, E.Giulmisarian, A.Starikov and M.Sinetova. An analysis of the fatty acid composition revealed that the cells of Hoshinaea borealis adapt to low temperatures by accumulating α-linolenic and 7,10,13-hexadecatrienoic acids and inducing the synthesis of 4,7,10,13-hexadecatetraenoic acid. The latter fatty acid is rare in the Chlorella clade, and in this work, we report for the first time the induction of its biosynthesis by low temperature.