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| 广西含笑的小孢子发生及雄配子体形成的研究 |
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付 琳1, 徐凤霞1, 曾庆文1*, 朱开甫2
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1.中国科学院 华南植物园, 广州 510650;2.徐闻县神州木兰园培植中心, 广东 湛江 524100
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| 摘要: |
| 对广西含笑的小孢子发生和雄配子体形成过程进行了解剖学研究。广西含笑的花药具4个花粉囊,花药壁由表皮、药室内壁、中层(3～5层)和绒毡层(1～2层)组成。绒毡层为腺质绒毡层,细胞具2至多核,到花粉成熟时自溶消失。小孢子母细胞减数分裂的胞质分裂为修饰性同时型,四分体排列方式为交叉型、对称型、“T”型(极少),成熟花粉粒具单沟,散粉时为二细胞型。在200个样品中,约有30%花药的小孢子母细胞在减数分裂前败育,还有40%的花药具有大量萎缩变形的花粉粒,花粉萌发率最高值只有25%。 |
| 关键词: 广西含笑 木兰科 小孢子发生 雄配子体形成 |
| DOI：10.3969/j.issn.1000-3142.2011.05.007 |
| 分类号:Q944.4 |
| Fund project: |
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| Studies of microsporogenesis and male gametophyte formation of Michelia guangxiensis |
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FU Lin1, XU Feng-Xia1, ZENG Qing-Wen1*, ZHU Kai-Fu2
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1.South China Botanical Garden, the Chinese Academy of Sciences, Guangzhou 510650, China;2.Shenzhou Magnolia Garden and Breeding Center of Xuwen, Zhanjiang 524100, China
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| Abstract: |
| Microsporogenesis and male gametophyte formation of Michelia guangxiensis were first observed in this paper. Anthers are tetrasporangiate and anther wall is composed of epidermis,fibrous endothecium,middle layer(3-5 layers)and tapetum(1-2 layers). The tapetum is of glandular type with 2 or more nucleus,which degenerate and finally disappear when the pollens are mature. Cytokinesis in meiosis is modified simultaneous type,resulting in decussate,isobilateral or T-shaped(rarely)tetrads. Pollen is monocolpate and sheds at the 2-cell stage. Among the 200 samples,the microspore mother cells in 30% anthers degenerate before meiosis and the microspores in 40% anthers degenerate seriously. The highest pollen germination rate is 25% only. |
| Key words: Magnoliaceae Michelia guangxiensis microsporogenesis male gametophyte formation |
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