Bagmet Veronika B, Abdullin Shamil R, Nikulin Arthur Yu, Nikulin Vyacheslav Yu, Gontcharov Andrey A
Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 159, 100-Letia Vladivostoka Prospect, Vladivostok 690022, Russia.
Life (Basel). 2023 Sep 20;13(9):1937. doi: 10.3390/life13091937.
Diatoms inhabit different aquatic and non-aquatic environments, including soils. The naviculoid genus is widespread in various habitats and accounts for 264 species that are only based on morphological and morphometric characteristics. These parameters can greatly vary during the life cycle, making the species very similar to each other and complicating their unambiguous identification. During a study on soil algal diversity in the Russian Far East (Jewish Autonomous Region), we isolated a strain of naviculoid diatom and examined it using an integrative approach (phylogenetic, morphological, ultrastructural data, and life cycle). Phylogenetic analyses, based on chloroplast L gene data, showed affinity of the new strain with the genus . Our alga shares morphological features typical of the genus members but differs from them by having valves with a larger width and hook-shaped external proximal raphe ends deflected to the side opposite the stigma. It was revealed that the strain reproduces via two types of sexual reproduction-isogamy and cis-anisogamy. Based on these phenotypic traits, we described the new isolate as sp. nov.
硅藻栖息于不同的水生和非水生环境，包括土壤。舟形藻属广泛分布于各种生境，有264个物种仅基于形态和形态测量特征。这些参数在生命周期中可能会有很大变化，使得物种彼此非常相似，难以明确鉴定。在对俄罗斯远东地区（犹太自治州）土壤藻类多样性的研究中，我们分离出一株舟形硅藻，并采用综合方法（系统发育、形态、超微结构数据和生命周期）对其进行了研究。基于叶绿体L基因数据的系统发育分析表明，新菌株与该属具有亲缘关系。我们的藻类具有该属成员典型的形态特征，但与它们不同的是，其瓣膜宽度更大，外部近端缝缘末端呈钩状，偏向与 stigma 相对的一侧。研究发现，该菌株通过两种有性生殖方式繁殖——同配生殖和顺式异配生殖。基于这些表型特征，我们将新分离物描述为 sp. nov.
