megaspores

常见例句

• Objective:The aim of this work is to probe into micromophological character of megaspores of Selaginella and their significance in taxonomy.
  目的:探讨卷柏属植物大孢子微形态学特征及其在植物分类学和药材鉴定学上的意义。
• The micropylar cell in a dyad always degenerated quickly and only chalazal one finished meiosis II to form two unequal-sized megaspores.
  合点端的二分体细胞中细胞器丰富，线粒体和质体的形态正常，表明完成再分化。
• Results: Comparative studies on megaspores, especially ornamentation, of thirteen species in the genus of Selaginella that are first reported here.
  结果:发现大孢子囊在孢子囊穗上着生位置有一定的规律;首次报道13种卷柏的大孢子微形态特征,极为难得。
• Yet the megaspores have all kind of degenerated forms in all developmental phases, so it can' t form the embryo, this is the main reason of forming small putamen type.
  而大孢子在各个发育阶段均会出现各种败育现象，因此无法形成胚，这是产生焦核的主要原因。
• Thick callose deposits in the walls of degenerative megaspores, while little in the wall of functional megaspore.
  退化的大孢子细胞壁胼胝质荧光明显，功能大孢子细胞壁上缺少胼胝质荧光。
• During the megasporogenesis, only one megaspore can continue to grow and develop, though several sporogoniums and megaspores might appear.
  大孢子发生过程中，具有多个孢原细胞的现象，但通常只有1个大孢子母细胞能继续发育；
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