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首页> 外文期刊>Mycologia >Characterization of a new chytrid species parasitic on the dinoflagellate, Peridinium gatunense
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Characterization of a new chytrid species parasitic on the dinoflagellate, Peridinium gatunense

机译：寄生在鞭毛鞭毛虫（Peridinium gatunense）上的一种新的苏属物种的特征

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Only a few chytrid fungi have been reported as parasites of dinoflagellates. Among these reports, chytrids are periodically observed growing on the dinoflagellate, Peridinium gatunense, in Lake Kinneret (Sea of Galilee), Israel. Because of the distinctive roles of parasitic chytrid fungi in decreasing phytoplankton populations and in transforming inedible algae into chytrid biomass which zooplankton grazers can eat, characterizing dinoflagellate parasites contributes to our understanding of the sustainability of this important water resource. An undescribed chytrid parasite of P. gatunense from Lake Kinneret has recently been brought into pure culture (KLL_TL-060613), facilitating exploration of its infection process. To evaluate the ability of this chytrid to affect host populations, we determined the effect of: (1) temperature and light (or dark) on prevalence of infection and (2) host growth phase and parasite:host ratio on percentage of infection. The greatest amplification in host infection occurred in cultures grown in the dark at 25 degrees C. The percentage of host cells infected increased as the availability of host cells compared to parasite cells increased. These results demonstrate that environmental factors influence the chytrid's potential to affect Peridinium gatunense populations. Because this chytrid had not been described taxonomically, we characterized its thallus morphology, development, zoospore ultrastructure and phylogenetic relationships. Zoospore ultrastructure was compatible with the Group II type zoospore characteristic of the family Chytridiaceae in the Chytridiales. Consistent with this observation, phylogenetic analyses of nuc 28S rDNA D1-D3 domains (28S) placed the chytrid in a Glade among described taxa in the Chytridiaceae. Because thallus morphology was distinct from these other taxa, as well as other described parasites of dinoflagellates, this chytrid is described as a new genus and species, Dinochytrium kinnereticum.
机译：据报道，仅有少量的乳糜真菌是鞭毛藻的寄生虫。在这些报告中，定期观察到在以色列的Kinneret湖（加利利海）的鞭毛虫（Peridinium gatunense）上生长着壶菌。由于寄生性纤支菌真菌在减少浮游植物种群以及将不可食用的藻类转化为浮游动物放牧者可以食用的糜菌生物质中具有独特的作用，表征鞭毛藻寄生虫有助于我们了解这一重要水资源的可持续性。最近将未描述的来自Kinneret湖的ga。P. tuntun chychyd chychyd寄生虫引入纯培养中（KLL_TL-060613），有助于探索其感染过程。为了评估该壶菌侵染宿主种群的能力，我们确定了以下因素的影响：（1）温度和光照（或暗度）对感染发生率的影响;（2）宿主生长期和寄生虫：宿主比率对感染率的影响。宿主感染的最大扩增发生在黑暗中于25摄氏度下生长的培养物中。与宿主细胞相比，感染宿主细胞的百分比随宿主细胞利用率的增加而增加。这些结果表明，环境因素影响了壶菌的潜伏性影响了Peridinium gatunense种群。由于尚未针对该壶菌分类进行分类，因此我们对其壶菌的形态，发育，游动孢子超微结构和系统发育关系进行了表征。游动孢子的超微结构与the虫科中的屈兰科的II类游动孢子特征相适应。与该观察结果一致，对nuc 28S rDNA D1-D3结构域（28S）进行系统发育分析，将壶菌丝置于the科中描述的类群中的Glade中。由于th的形态不同于这些其他类群，以及其他描述的鞭毛鞭毛虫的寄生虫，因此该乳糜菌被描述为一种新的属和种，Dinochytrium kinnereticum。

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