megaspores

基本解釋

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(xué)特征及其在植物分類學(xué)和藥材鑒定學(xué)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(diǎn)端的二分體細(xì)胞中細(xì)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(bào)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(gè)發(fā)育階段均會(huì)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(xì)胞壁胼胝質(zhì)熒光明顯，功能大孢子細(xì)胞壁上缺少胼胝質(zhì)熒光。