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首页> 外文期刊>Harmful Algae >Cellular and nuclear morphological variability within a single species of the toxigenic dinoflagellate genus Gambierdiscus: Relationship to life-cycle processes
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Cellular and nuclear morphological variability within a single species of the toxigenic dinoflagellate genus Gambierdiscus: Relationship to life-cycle processes

机译：产毒的鞭毛藻属冈比亚氏菌的单个物种内的细胞和核形态变异：与生命周期过程的关系

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摘要

Dinoflagellates belonging to the genus Gambierdiscus are the causative agent of ciguatera fish poisoning (CFP). This syndrome, which is widespread in tropical and subtropical regions, has recently been reported also in temperate latitudes. Taxonomic studies of Gambierdiscus have yet to completely couple the morphological features of member species with their genetics. In this study, the cellular and nuclear morphology of a single strain of one species of Gambierdiscus was determined in cells grown under different culture conditions. The results showed a wide-ranging variability of cell sizes, together with a clear relationship between cell size and nuclear morphology. Thus, small cells were associated with round to oval or slightly U-shaped nuclei and large cells with obviously U-shaped nuclei. Most cells exhibited the typical anterio-posteriorly compressed lenticular, shape of Gambierdiscus, with the exception of a few small globular-shaped specimens. In all cells, regardless of their size, the arrangement of the thecal plates was typical of lenticular Gambierdiscus. Dividing cells were consistently the largest. In these cells, nuclear morphology, karyokinesis, and cytokinesis were characterized. Cells underwent division only during the dark period, thus demonstrating their spontaneous synchronized division. Cellular forms related to the sexual cycle were also present in the cultures and included gamete pairs and putative meiotic planozygotes. The effect of the culture medium was studied by means of principal component analyses, which showed a positive correlation between the medium used and nuclear size and shape but not cell size.
机译：属于冈比亚属的鞭毛藻是雪鱼鱼类中毒的致病因子。该综合征在热带和亚热带地区普遍存在，最近在温带地区也有报道。 Gambierdiscus的分类学研究尚未完全将成员物种的形态特征与其遗传学结合起来。在这项研究中，在不同培养条件下生长的细胞中，确定了一种甘比氏菌的单一菌株的细胞和核形态。结果显示细胞大小的广泛变化，以及细胞大小和核形态之间的明确关系。因此，小细胞与圆形到卵形或略呈U形的核相关，而大细胞与明显的U形的核相关。除少数小球状标本外，大多数细胞均表现出典型的前-后压缩双凸状冈比亚盘状。在所有细胞中，无论其大小如何，鞘状板的排列都是双凸型冈比亚盘菌的典型特征。划分单元始终是最大的单元。在这些细胞中，表征了核的形态，核运动和胞质分裂。细胞仅在黑暗时期经历分裂，因此证明了它们的自发同步分裂。与性周期有关的细胞形式也存在于培养物中，包括配子对和推定的减数分裂的扁桃体。通过主成分分析研究了培养基的作用，该分析表明所用培养基与细胞核大小和形状呈正相关，而与细胞大小无关。

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  • 来源
    《Harmful Algae》 |2014年第12期|1-8|共8页
  • 作者

    Isabel Bravo; Rosa Isabel Figueroa; Santiago Fraga;

  • 作者单位

    Microalgas Nocivas (VGO-HAB), Instituto Espanol de Oceanografia (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain;

    Microalgas Nocivas (VGO-HAB), Instituto Espanol de Oceanografia (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain,Aquatic Ecology, Biology Building, Lund University, 22362 Lund, Sweden;

    Microalgas Nocivas (VGO-HAB), Instituto Espanol de Oceanografia (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Gambierdiscus; Ciguatera fish poisoning; CFP; Benthic dinoflagellates; Harmful algae; Life cycle;

    机译：Gambierdiscus;Ciguatera鱼中毒;CFP;底栖鞭毛虫;有害藻类;生命周期;

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