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Description of the new phototrophic dinoflagellate Alexandrium pohangense sp nov from Korean coastal waters

机译：来自韩国沿海水域的新型光养性鞭毛藻亚历山大藻pohangense sp nov的描述

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摘要

The planktonic phototrophic dinoflagellate Alexandrium pohangense sp. nov. isolated from the coastal waters off Korea is described from living and fixed cells by light and scanning electron microscopy (SEM). DNA sequence data were collected from the small subunit (SSU), the large subunit (LSU), internal transcribed spacer regions (ITS1 and ITS2), and 5.8S of the ribosomal DNA (rDNA). The SSU and LSU rDNA sequences of the new dinoflagellate were 4-7% and 14-17%, respectively, different from those of Alexandrium minutum, Alexandrium ostenfeldii, Alexandrium tamutum, Alexandrium margalefii, and Alexandrium pseudogonyaulax, the most closely related species. In addition, the 5.85 rDNA sequence of the new dinoflagellate was also 12% different from those of A minutum, A ostenfeldii, A. tamutum, and Alexandrium peruvianum. In a phylogenetic tree based on LSU rDNA sequences, A pohangense formed a clade with A. margalefii, and this clade was clearly distinct from the clade of A minutum, Alexandrium diversaporum, A. tamutum, Alexandrium leei, A ostenfeldii, and Alexandirum andersoni. Moreover, in a phylogenetic tree based on SSU rDNA sequences, A pohangense was positioned at the base of the clade containing A. leei and A diversaporum. Morphological analysis showed that A pohangense has a Kofoidian plate formula of Po, 4', 6", 6c, 8s, 5"'. and 2"''. which confirmed its assignment to the genus Alexandrium. This dinoflagellate has a wide rectangular 1' plate, the upper left side of which is slightly bent, protruding, and touching the 2' plate, unlike A. margalefii, which has a wide rectangular 1' plate that does not touch the 2' plate, or A pseudogonyaulax and Alexandrium camurascutulum, which have a narrower elongated pentagonal l' plate that touches the 2' plate. Furthermore, the 1' plate of A pohangense meets the 1" plate as a straight vertical line, whereas that of A. camurascutulum meets the 1" plate as an inclined line because it is lifted by the intrusion of the 1" plate. In addition, A pohangense had a relatively small ventral pore whose majority was located on the 4' plate, unlike A margalefii or A pseudogonyaulax, which have a relatively large ventral pore whose majority is located on the 1' plate. Furthermore, A pohangense had pores of two different sizes on the cell surface, unlike A margalefii and A pseudogonyaulax, which have similar pores of only one size. On the basis of morphological and phylogenetic criteria, it is proposed that this is a new species of the genus Alexandrium. (C) 2015 Elsevier B.V. All rights reserved.
机译：浮游性光养藻鞭毛亚历山大藻pohangense sp。十一月通过光和扫描电子显微镜（SEM）描述了从韩国沿海水域分离出的活细胞和固定细胞。 DNA序列数据收集自小亚基（SSU），大亚基（LSU），内部转录间隔区（ITS1和ITS2）和5.8S核糖体DNA（rDNA）。新的鞭毛甲藻的SSU和LSU rDNA序列分别与最接近的物种亚历山大小Alexandr，亚历山大大骨菜，亚历山大大mut木，亚历山大小gal和亚历山大假gon不同，分别为4-7％和14-17％。此外，新的鞭毛甲藻的5.85 rDNA序列与A minutum，A ostenfeldii，tamutum和Alexandrum peruvianum的序列也有12％的差异。在基于LSU rDNA序列的系统树中，鲍汉根（Pohangense）与玛格氏菌（A. margalefii）形成了一个进化枝，该进化枝明显不同于小枝，亚历山大草（Alexutium diversaporum），蒿（A. tamutum），亚历山大雷（Alexandreleei），奥斯汀费尔德（A ostenfeldii）和亚历山大·安德森（Alexandirum andersoni）的进化枝。此外，在基于SSU rDNA序列的系统发育树中，将pohangense定位在包含雷氏芽孢杆菌和diversaporum的进化枝的底部。形态学分析表明，A pohangense具有Kofoidian板式，为Po，4'，6“，6c，8s，5”'。和2“''。证实其已归入亚历山大藻属。这种鞭毛虫具有宽的矩形1'板，其左上侧略微弯曲，突出并接触2'板，这与A. margalefii不同，具有一个不接触2'板的宽矩形1'板，或A pseudogonyaulax和Alexandrium camurascutulum，它们具有一个较窄的拉长的五边形l'板，其接触2'板。此外，A pohangense的1'板与1“板为竖直垂直线，而A. camurascutulum与1”板以倾斜线相交，因为它通过1“板的侵入而被抬起。另外，与具有较大的腹孔且其大部分位于1'平板上的玛格丽菲（A margalefii）或拟gon（A pseudogonyaulax）不同，鲍汉香的腹孔相对较小，其多数位于4'板上。此外，与具有仅一个大小的相似孔的玛格丽菲（A margalefii）和拟假ya（A pseudogonyaulax）不同，波汉香在细胞表面上具有两个不同大小的孔。根据形态和系统发育标准，提出这是亚历山大属的新物种。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Harmful Algae》 |2015年第6期|49-61|共13页
  • 作者

    Lim An Suk; Jeong Hae Jin; Kim Ji Hye; Lee Sung Yeon;

  • 作者单位

    Seoul Natl Univ, Coll Nat Sci, Sch Earth & Environm Sci, Seoul 151747, South Korea;

    Seoul Natl Univ, Coll Nat Sci, Sch Earth & Environm Sci, Seoul 151747, South Korea|Adv Inst Convergence Technol, Suwon 443270, Gyeonggi Do, South Korea;

    Seoul Natl Univ, Coll Nat Sci, Sch Earth & Environm Sci, Seoul 151747, South Korea;

    Seoul Natl Univ, Coll Nat Sci, Sch Earth & Environm Sci, Seoul 151747, South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    HAB; New species; Phylogeny; Protist; Red tide; Taxonomy;

    机译：HAB;新物种;系统发育;原生生物;赤潮;分类学;

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