China Pharmaceutical Culture Collection, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, People's Republic of China.
Extremophiles. 2024 Aug 23;28(3):40. doi: 10.1007/s00792-024-01355-1.
Lichens are dual organisms, with one major mycobiont and one major photobiont in each lichen symbiosis, which can survive extreme environmental conditions in the Arctic. However, the diversity and distribution of lichen photobionts in the Arctic remain poorly understood compared to their mycobiont partners. This study explored the diversity of lichen mycobionts and photobionts in 197 lichen samples collected from the Ny-Ålesund region (Svalbard, High Arctic). The nuclear ribosomal internal transcribed spacer (ITS) regions were sequenced and phylogenetic analyses were performed. The relationships between mycobionts and photobionts, as well as the association patterns, were also investigated. A total of 48 species of lichen mycobionts (16 families, nine orders) and 31 species/lineages of photobionts were identified. These 31 photobiont species belonged to one class (Trebouxiophyceae) and five genera, including 22 species of Trebouxia, five species of Asterochloris, two species of Chloroidium, one species of Symbiochloris, and one species of Coccomyxa. The results indicated that most analyzed lichen mycobionts could associate with multiple photobiont species, and the photobionts also exhibited a similar pattern. The results provided an important reference dataset for characterizing the diversity of lichen mycobionts and photobionts in the High Arctic region.
地衣是一种双重生物体，每一种地衣共生体中都有一个主要的真菌共生体和一个主要的光合共生体，可以在北极的极端环境条件下生存。然而，与真菌共生体相比，地衣光合共生体的多样性和分布在北极地区仍了解甚少。本研究探讨了从斯瓦尔巴群岛（北极高地区域）的 Ny-Ålesund 地区采集的 197 个地衣样本中的地衣真菌共生体和光合共生体的多样性。对核核糖体内部转录间隔区（ITS）区域进行了测序，并进行了系统发育分析。还研究了真菌共生体和光合共生体之间的关系以及关联模式。共鉴定出 48 种地衣真菌共生体（16 科，9 目）和 31 种地衣光合共生体/谱系。这 31 种地衣光合共生体属于一个纲（Trebouxiophyceae）和五个属，包括 22 种 Trebouxia、5 种 Asterochloris、2 种 Chloroidium、1 种 Symbiochloris 和 1 种 Coccomyxa。结果表明，大多数分析的地衣真菌共生体可以与多种光合共生体结合，而光合共生体也表现出相似的模式。研究结果为描述北极高地区域地衣真菌共生体和光合共生体的多样性提供了重要的参考数据集。
