The gametes of chlorophytes can be divided into two morphological types (types α and β) based on the position of the mating structure relative to the flagella and eyespot. To elucidate the relationship between the morphological types and the sexes, we studied spatial relationships between the flagellar apparatus‐eyespot‐mating structures in biflagellate male and female gametes and their fate after fertilization in the anisogamous (Monostroma angicava) and the slightly anisogamous species (Collinsiella cava) using field emission scanning electron microscopy and transmission electron microscopy. The smaller male and larger female gametes of M. angicava had two basal bodies arranged at a 180° angle and the cell surface coated with square‐shaped body scales, except for the flagella and mating structures. The mating structure of the female gamete was located on the same side of the flagellar beat plane as the eyespot (type β), whereas that of the male gamete was located on the opposite side (type α). This mating structure arrangement was also confirmed in C. cava. The initial fusion when male and female gametes were mixed involved the mating structures. In a fusing pair of gametes, each flagellum of one gamete lay alongside one flagellum of the other gamete. As fusion proceeded, the gamete pair transformed into a quadriflagellate planozygote, in which the four basal bodies were arranged in a cruciate pattern. The eyespots were positioned side‐by‐side on the same side of the cell. These results suggest that the two morphological types of gametes are intimately correlated with the particular sexes.

中文翻译：

---

Monostroma angicava 和 Collinsiella cava（绿藻纲，绿藻门）有鳞配子中交配结构的性别特异性定位：雄性和雌性配子之间可能存在广泛差异


根据交配结构相对于鞭毛和眼斑的位置，叶绿植物的配子可分为两种形态类型（α型和β型）。为了阐明形态类型与性别之间的关系，我们研究了双鞭毛雄性配子和雌性配子中鞭毛器-眼点-交配结构之间的空间关系及其在异配物种（ Monostroma angicava ）和轻微异配物种（ Collinsiella ）受精后的命运。 cava ）使用场发射扫描电子显微镜和透射电子显微镜。 M的较小的雄性配子和较大的雌性配子。 angicava有两个呈180°角排列的基体，细胞表面除鞭毛和交配结构外均覆盖有方形体鳞。雌配子的交配结构位于鞭毛节拍平面与眼点的同一侧（β型），而雄配子的交配结构位于相对侧（α型）。这种交配结构排列也在C中得到证实。卡瓦酒。雄性和雌性配子混合时的最初融合涉及交配结构。在一对融合的配子中，一个配子的每个鞭毛与另一个配子的一个鞭毛并排放置。随着融合的进行，配子对转变为四鞭毛扁平合子，其中四个基体以十字形排列。眼点并排放置在细胞的同一侧。这些结果表明配子的两种形态类型与特定性别密切相关。