| 摘要: |
| 本工作主要应用石蜡切片方法,对芝麻大孢子发生和雌配子体的发育进行了观察,同时初步观察了淀粉粒以及减数分裂过程中胼胝质的变化。结果表明:①芝麻为倒生胚珠,单珠被,薄珠心;②大孢子母细胞直接来源于孢原细胞,减数分裂形成线形排列四分体,合点端一个为功能大孢子,胚囊发育为蓼型,成熟胚囊中见不到反足细胞;③在胚囊发育过程中,胚囊两侧的珠心表皮细胞解体,胚囊紧贴于由珠被内表皮转变而成的珠被绒毡层之下。合点端珠心细胞转变为承珠盘;④减数分裂前期,大孢子母细胞无胼胝质壁,二分体、四分体也只有横向的胼胝质壁,而侧壁则无;⑤淀粉粒最初出现在子房壁和胎座中,并不断向胚囊提供多糖类物质。 |
| 关键词: 芝麻 大孢子发生 雌配子体发育 |
| DOI： |
| 投稿时间：1992-01-09 |
| 基金项目: |
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| Studies on Megasporogenesis and Development of Female Gametophyte of Sesame |
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| Abstract: |
| The ovules of Sesamum indicum L.are anatropous,unitegmic and tenuinucel- late.with a hypodermal archesporical cell which develops directly as the megaspore mother cell.Megasporogenesis is normal,and a monosporic eight-nucleate embryo sac of the most common polygonum type develops from the chalazai megaspore.The antipodals are short- lived and degenerate when the two polars fuse forming a big secondary nucleus.During the development of female gametophyte the inner epidermal cells of the integument develop in... |
| Key words: seasme(Sesamum indicum L.) megasporogenesis development of female gametophyte |
