Spermiogenesis and spermatozoa ultrastructure in Salminus and Brycon, two primitive genera in Characidae (Teleostei: Ostariophysi: Characiformes)
Spermiogenesis and spermatozoa ultrastructure in Salminus and Brycon, two primitive genera in Characidae (Teleostei: Ostariophysi: Characiformes)
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DOI：
10.1111/j.1463-6395.2006.00243.x
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发表时间：
2006-10
期刊：
影响因子：
1.2
通讯作者：
R. Veríssimo‐Silveira;P. Gusmão-Pompiani;C. A. Vicentini;I. Quagio‐Grassiotto
中科院分区：
文献类型：
--
作者：
R. Veríssimo‐Silveira;P. Gusmão-Pompiani;C. A. Vicentini;I. Quagio‐Grassiotto
Verissimo-Silveira河，Gusmao-Pompiani P.，维森蒂尼角一、夸焦-格拉西奥托岛2006.真骨鱼科两个原始属--盐鱼属和石鱼属的精子发生及超微结构研究（真骨鱼纲：骨鱼亚目：溪形目）- 动物学学报（斯德哥尔摩）87：305-313在Salminus中，精子发生是囊性的，并起源于I型水精子。精细胞分化的特征是染色质浓缩成粗纤维，核旋转，核窝形成，细胞质通道形成，线粒体融合产生长而分叉的线粒体，以及围绕细胞质通道的质膜周围存在几个膜状同心环。在Salminus和Brycon中，精子非常相似。细胞核呈球形，染色质凝聚成纤维簇，核窝较深。它们显示了一个长的中段，在起始区域有几个细长的线粒体，细胞质通道完全被一个或两个膜状同心环包围。鞭毛轴垂直于细胞核，呈典型的（9 + 2）轴丝。Salminus和Brycon精子之间观察到的非常强的相似性支持的假设，这些亚科可能有一个单系起源。
Verissimo-Silveira R., Gusmao-Pompiani P., Vicentini C. A., Quagio-Grassiotto I. 2006. Spermiogenesis and spermatozoa ultrastructure in Salminus and Brycon , two primitive genera in Characidae (Teleostei: Ostariophysi: Characiformes). — Acta Zoologica (Stockholm) 87 : 305-313 In Salminus , spermiogenesis is cystic and gives origin to a type I aquasperm. Spermatid differentiation is characterized by chromatin condensed into thick fibres, nuclear rotation, nuclear fossa formation, cytoplasmic channel formation, mitochondrial fusion producing long and ramified mitochondria, and the presence of several membranous concentric rings around the plasma membrane that encircles the cytoplasmic channel. In Salminus and Brycon , spermatozoa are very similar. They exhibit a spherical nucleus and chromatin condensed into fibre clusters, and a deep nuclear fossa. They show a long midpiece with few elongate mitochondria at the initial region and a cytoplasmic channel completely encircled by one or two membranous concentric rings. The flagellar axis is perpendicular to the nucleus and exhibits the classic axoneme (9 + 2). The very strong similarity observed between Salminus and Brycon spermatozoa supports the hypothesis that these subfamilies are likely to have a monophyletic origin.