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首页> 外文期刊>Harmful Algae >Molecular phylogeny, pigment composition, toxicology and life history of Pseudochattonella cf. verruculosa (Class Dictyochophyceae) from Wellington Harbour, New Zealand
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Molecular phylogeny, pigment composition, toxicology and life history of Pseudochattonella cf. verruculosa (Class Dictyochophyceae) from Wellington Harbour, New Zealand

机译：假单胞菌的分子系统发育，色素组成，毒理学和生活史来自新西兰惠灵顿港的verruculosa（类鞭毛藻科）

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摘要

Pseudochattonella verruculosa is a heterokont flagellate and has frequently been found associated with multi-species harmful algal blooms in Wellington Harbour. In this study the partial sequences of the nuclear encoded LSU rDNA and the large subunit of ribulose bisphosphate carboxylase (rbcL) of Pseudochattonella isolated from Wellington Harbour indicate that it is similar to P. verruculosa, while sequences of mitochondrial encoded COI, are similar to those of Pseudochattonella farcimen. As with P. farcimen, the Wellington Pseudochattonella lacked violaxanthin, lutein and anteroxanthin, three pigments detected only in P. verruculosa. The Wellington isolate also contains zeaxanthin which is absent in P. farcimen. Among all Pseudochattonella, cells of the Wellington isolate are the most variable in terms of both size and shape. Mucocysts of the Wellington Pseudochattonella also have the greatest degree of variation - from small, 'bullet'-shape to large oval, oblong or 'sausage'-like. In the sexual reproduction phase two gametes of the Wellington isolate fuse to form a zygote which gives rise to a large multi-nucleate cell. At times two or more of these large multi-nucleate cells fuse further to form a 'massive', plasmodium-like aggregate (up to 200 μm long). Positive feeding and toxicity tests on rotifers confirmed that the Wellington Pseudochattonella is cytotoxic and probably also contributed to the May 2010 fish kills. As molecular phylogenies do not conclusively support the separation of the Wellington Harbour Pseudochattonella from P. verruculosa or P. farcimen, it is tentatively named as Pseudochattonella cf. verruculosa.
机译：疣状假单胞菌是异鞭毛鞭毛，并且经常被发现与惠灵顿港的多物种有害藻华有关。在这项研究中，从惠灵顿港分离出的假单胞菌核编码的LSU rDNA的部分序列和核糖双磷酸羧化酶的大亚基（rbcL）表明，它与疣状假单胞菌相似，而线粒体编码的COI序列与之相似。假单胞菌。与far球菌一样，惠灵顿假单胞菌也缺乏紫黄质，叶黄素和花青素，这三种色素仅在疣状假单胞菌中被检测到。惠灵顿分离株还含有玉米黄质，玉米黄质在P. farcimen中不存在。在所有假单胞菌中，惠灵顿分离株的细胞在大小和形状方面变化最大。惠灵顿假单胞菌的黏液囊也具有最大程度的变异-从小的“子弹”形到大的椭圆形，长方形或“香肠”形。在有性生殖阶段，惠灵顿分离株的两个配子融合形成一个合子，合子产生一个大的多核细胞。有时，这些大型多核细胞中的两个或多个会进一步融合，以形成“大规模”的类似疟原虫的聚集体（最长200μm）。对轮虫的积极摄食和毒性测试证实，惠灵顿假单胞菌具有细胞毒性，可能还导致了2010年5月的鱼类死亡。由于分子系统发育学不能最终支持惠灵顿港假单胞菌与疣状假单胞菌或粉虱假单胞菌的分离，因此暂定命名为假单胞菌。 verruculosa。

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