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首页> 外文期刊>Phycological Research >Evolution of centric diatoms inferred from patterns of oogenesis and spermatogenesis
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Evolution of centric diatoms inferred from patterns of oogenesis and spermatogenesis

机译：从卵生和生精模式推断中心硅藻的进化

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摘要

Centric diatoms have three patterns of oogenesis and four patterns of spermatogenesis, yielding a combination of seven patterns. The evolution of these combinations was inferred from differences in character states of the meiotic patterns observed in oogenesis and spermatogenesis. Furthermore, we have inferred the evolutionary relationships among centric diatoms based on the evolution of these combinations, the data on occurrence of combinations and a molecular phylogenetic tree. Our results suggested that the last common ancestor of extant diatoms was a bipolar or multipolar centric diatom with the most primitive among extant oogenetic-spermatogenic combinations. Our results also suggested that ancestors of the radial centrics and pennates would have diverged, in that order, from a bipolar or multipolar centric diatom with the most primitive among extant oogenetic-spermatogenic combinations.
机译：中心硅藻具有三种生卵模式和四种生精模式，可产生七种模式的组合。这些组合的进化是从卵子发生和精子发生中观察到的减数分裂模式的特征状态差异推断出来的。此外，我们根据这些组合的演化，组合出现的数据和分子系统发育树，推断出中心硅藻之间的演化关系。我们的研究结果表明，现存硅藻的最后共同祖先是双极或多极中心硅藻，在现存的生卵-生精组合中最为原始。我们的研究结果还表明，放射状中心和三角状的祖先将以这种顺序从双极性或多极性的中心硅藻中分离出来，而在现存的造血-生精组合中最原始。

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