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首页> 外文期刊>Harmful Algae >The dinoflagellate genus Alexandrium (Halim) in New Zealand coastal waters: comparative morphology, toxicity and molecular genetics
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The dinoflagellate genus Alexandrium (Halim) in New Zealand coastal waters: comparative morphology, toxicity and molecular genetics

机译：新西兰沿海水域的鞭毛藻亚历山大藻（哈林）：比较形态，毒性和分子遗传学

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摘要

Morphological descriptions, toxicity data and an analysis of LSU rRNA gene sequences are presented for seven species within the marine dinoflagellate genus Alexandrium (Halim), identified in New Zealand coastal waters. All species were established in culture and comparison of their morphology with descriptions from the literature showed these isolates to correspond to the previously described taxa: A. catenella,A. tamarense, A. fraterculus, A. concavum, A. ostenfeldii, A. margalefi and A. pseudogoniaulax. With the exception of A. ostenfeldii, none of these species has previously been recorded in New Zealand. Most of these species are widespread and common, though they are rarely abundant, A. fraterculus has been the most frequent bloom former. Three species, A. catenella, A. tamarense, A. ostenfeldii, produced paralytic shellfish poisoning (PSP) toxins but to date only A. catenella has been associated with a significant shellfish-toxin contamination event. A. catenella and A. tamarense isolates produced toxin profiles predominating in low specific toxicity TV-sulfo-carbamoyl analogues, and had identical LSU rRNA gene sequences which place them within the Pacific/Asian clade. The formation of putative hypnozygotes in mating experiments between A. tamarense and some A. catenella isolates suggested these were sexually compatible. However, although >70% of these cysts germinated, the survival of the progeny was poor. A. pseudogoniaulax and A. concavum are the most distantly related to other species within the genus.
机译：介绍了在新西兰沿海水域发现的海洋鞭毛藻亚历山大藻属（哈林）中的七个物种的形态学描述，毒性数据和LSU rRNA基因序列分析。所有种类均在培养物中建立，并且其形态与文献描述的比较表明，这些分离物对应于先前描述的分类群：A。catenella，A。 tamarense，A。fraterculus，A。concavum，A。ostenfeldii，A。margalefi和A. pseudogoniaulax。除奥斯滕费尔德氏菌外，新西兰以前均未记录到这些物种。这些物种大多数虽然没有那么丰富，但分布广泛且普遍，但黄曲霉一直是最常见的开花前者。三种物种，即A. catenella，A。tamarense和A. ostenfeldii，产生了麻痹性贝类毒素（PSP）毒素，但迄今为止，只有A. catenella与重大的贝类毒素污染事件有关。链霉菌和塔玛氏菌分离物产生的毒素谱主要存在于低比毒性的TV-磺基氨基甲酰基类似物中，并具有相同的LSU rRNA基因序列，将它们置于太平洋/亚洲进化枝中。 tamarense拟南芥和一些A. catenella分离株之间的交配实验中推定的合子的形成表明它们是性相容的。然而，尽管这些囊肿中有> 70％已发芽，但后代的存活率却很低。 A. pseudogoniaulax和A. concavum与该属中其他物种的亲缘关系最远。

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