Structure and significance of cruciate flagellar root systems in green algae: Female gametes ofBryopsis lyngbyei (Bryopsidales)
Structure and significance of cruciate flagellar root systems in green algae: Female gametes ofBryopsis lyngbyei (Bryopsidales)
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绿藻十字鞭毛根系的结构和意义：羽藻目（Bryopsidales）的雌配子
DOI：
10.1007/bf02074128
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
M. Melkonian
中科院分区：
文献类型：
--
作者：
M. Melkonian
本文对绿藻Bryopsis lyngbyei双鞭毛雌配子鞭毛器的超微结构进行了详细的研究。在鞭毛和基底体中，一些B管中出现微管间隔。鞭毛的过渡区很长(260-290 nm)，横截面呈星状，但缺乏横隔膜。两个基体成180°角，近端重叠。它们由一个复合的无条纹盖板连接。与盖板相关联的端帽部分地闭合每个基底的近端。鞭毛为十字形，有三种不同类型的微管根，即鞭毛器不呈180°旋转对称性。一种根型包含两个微管，它们连接到一个精致的圆柱形结构，推测是交配结构。相反的根在其全长上表现出3个微管，并且与圆柱形结构无关。在它们的近端，两根都与下面的新月体相连。另外两个微管根可能是相同的，由4个(或5个)微管组成，显示出构型变化。这两个相同的根部插入盖板并连接到每个基准体的内侧(即与另一个基准体相邻的一侧)，而另外两个根部附着在每个基准体的外侧。系统I的横纹纤维可能与四根中的每一个联系在一起，而系统II的纤维尚未被观察到。雌配子的鞭毛器。灵长藻有许多独特的特征，但在某些方面与绿豆藻相似。讨论了绿藻十字鞭毛根系的功能和系统发育。
The ultrastructure of the flagellar apparatus in the biflagellate female gametes of the green algaBryopsis lyngbyeihas been studied in detail. In the flagellum and basal body, microtubule septations occur in some of the B-tubules. The transition region of the flagellum is extremely long (260–290 nm), exhibits a stellate pattern in cross section but lacks the transverse diaphragm. The two basal bodies form an angle of 180° and overlap at their proximal ends. They are connected by a compound non-striated capping plate. Terminal caps associated with the capping plate partially close the proximal end of each basal body. A cruciate flagellar root system with three different types of microtubular roots is present, i. e. the flagellar apparatus does not show 180° rotational symmetry. One root type contains 2 microtubules which are connected to an elaborate cylindrical structure, presumably a mating structure. The opposite root exhibits 3 microtubules over its entire length and is not associated with a cylindrical structure. In their proximal parts both roots are linked to an underlying crescent body. The other two microtubular roots are probably identical and consist of 4 (or 5) microtubules which show configurational changes. These two identical roots insert into the capping plate and link to the inner side (i. e. the side adjacent to the other basal body) of each basal body, whereas the other two roots attach to the outer sides of each basal body. System I striated fibres are probably associated with each of the four roots, while system II fibres have not been observed. The flagellar apparatus of female gametes ofB. lyngbyeishows many unique features but in some aspects resembles that of ulvalean algae. Functional and phylogenetic aspects of cruciate flagellar root systems in green algae are discussed.