megaspores

常見例句

• Objective:The aim of this work is to probe into micromophological character of megaspores of Selaginella and their significance in taxonomy.
  目的:探討卷柏屬植物大孢子微形態(tài)學特征及其在植物分類學和藥材鑒定學上的意義。
• The micropylar cell in a dyad always degenerated quickly and only chalazal one finished meiosis II to form two unequal-sized megaspores.
  合點端的二分體細胞中細胞器豐富，線粒體和質(zhì)體的形態(tài)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.
  結(jié)果:發(fā)現(xiàn)大孢子囊在孢子囊穗上著生位置有一定的規(guī)律;首次報道13種卷柏的大孢子微形態(tài)特征,極為難得。
• 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.
  而大孢子在各個發(fā)育階段均會出現(xiàn)各種敗育現(xiàn)象，因此無法形成胚，這是產(chǎn)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.
  退化的大孢子細胞壁胼胝質(zhì)熒光明顯，功能大孢子細胞壁上缺少胼胝質(zhì)熒光。
• During the megasporogenesis, only one megaspore can continue to grow and develop, though several sporogoniums and megaspores might appear.
  大孢子發(fā)生過程中，具有多個孢原細胞的現(xiàn)象，但通常只有1個大孢子母細胞能繼續(xù)發(fā)育；
返回 megaspores