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首页> 外文期刊>Harmful Algae >New insights on the life cycle stages of the toxic benthic dinoflagellate Ostreopsis cf. ovata
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New insights on the life cycle stages of the toxic benthic dinoflagellate Ostreopsis cf. ovata

机译：关于有毒底栖鞭毛鞭毛藻的生命周期阶段的新见解。卵形

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摘要

New observations on the life cycle stages of Ostreopsis cf. ovata are reported in the field and in cultures samples from the northern Adriatic Sea (Mediterranean Sea). Cultures of O. cf. ovata were performed using both replete and N-free growth media and analyzed for 5 months. Ostreopsis cells displayed a high morphological variability. Some cells were characterized by the presence of orange accumulation bodies, which represented a signal of stress conditions. Two mechanisms of gamete mating seem to occur. In the first (already reported) vegetative cells conjugated through the epitheca without plasmogamy; in this regard we observed a new 'process' on the top of the epitheca which might represent a structure involved in this mating mechanism. In the second, small cells acting as gametes were aligned laterally with the two cingula perpendicular to each other. Meiosis possibly occurred as suggested by tetrad formation, originating four vegetative cells. At least two types of cyst were formed, a non-dormant (pellicle) cyst germinating within 2 days and a resting cyst which is able to germinate after a 5-month dormancy only at temperatures over 25 ℃.
机译：关于骨质疏松症生命周期阶段的新观察。在野外和来自亚得里亚海北部（地中海）的文化样本中都报告有卵。 O.文化。卵子使用充分和无氮生长培养基进行，并分析5个月。骨质疏松症细胞表现出很高的形态变异性。一些细胞的特征是橙色积累体的存在，这代表了应激条件的信号。配子交配的两种机制似乎发生了。在第一个（已经报道过）通过上皮结合的营养细胞中，没有血浆形成；在这方面，我们在上皮的顶部观察到一个新的“过程”，它可能代表了这种交配机制所涉及的结构。在第二个中，充当配子的小细胞与两个扣带相互垂直地横向对齐。减数分裂可能如四分体形成所暗示的那样发生，起源于四个营养细胞。至少形成了两种类型的囊肿，一种是在2天内发芽的非休眠（膜状）囊肿，另一种是只有在25℃以上的温度休眠5个月后才能发芽的静止囊肿。

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  • 来源
    《Harmful Algae》 |2014年第4期|7-16|共10页
  • 作者

    Stefano Accoroni; Tiziana Romagnoli; Salvatore Pichierri; Cecilia Totti;

  • 作者单位

    Dipartimento di Scienze delta Vita e dell'Ambiente, Universita Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy;

    Dipartimento di Scienze delta Vita e dell'Ambiente, Universita Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy;

    Dipartimento di Scienze delta Vita e dell'Ambiente, Universita Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy;

    Dipartimento di Scienze delta Vita e dell'Ambiente, Universita Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy;

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  • 正文语种 eng
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  • 关键词

    Ostreopsis; Harmful algae; Cysts; Life cycle; Gamete fusion; Benthic dinoflagellates;

    机译：骨质疏松症;有害藻类;囊肿;生命周期;配子融合;底栖鞭毛虫;

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