| 五种木兰属植物的花粉形态 |
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| 引用本文： | 徐凤霞,徐信兰,胡晓颖.五种木兰属植物的花粉形态[J].云南植物研究,2004,26(1):83-88. |
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| 作者姓名： | 徐凤霞 徐信兰 胡晓颖 |
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| 作者单位： | 中国科学院华南植物研究所,广东,广州,510650 |
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| 基金项目： | 国家自然科学基金(30 0 0 0 0 11,30 370 10 8)，广东省自然科学基金( 0 0 0 991)资助项目 |
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| 摘 要： | 对木兰属(Magnolia)5种花粉进行了光学显微镜观察，形态相似。扫描电镜下观察，花粉外壁均为小穴状纹饰，荷花玉兰(M．grandiflora)略为粗糙。透射电镜下观察，5种花粉外壁均可分为覆盖层、柱状层和基层。覆盖层不连续，有小穿孔。在远极面萌发沟区域，外壁逐渐减薄，最后覆盖层和柱状层消失，仅残留基层。柱状层内部空隙较小，多由颗粒构成，处于小柱发育的初级阶段。荷花玉兰和玉兰萌发沟区域下有明显的外壁-2。木兰属花粉属于原始类型的代表。
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| 关 键 词： | 木兰属 花粉形态 花粉外壁 柱状层 |
| 文章编号： | 0253-2700(2004)01-0083-06 |
| 修稿时间： | 2003年7月8日 |
Pollen Morphology of Five Species from Magnolia |
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| XU Feng-Xia,XU Xin-Lan,HU Xiao-Ying.Pollen Morphology of Five Species from Magnolia[J].Acta Botanica Yunnanica,2004,26(1):83-88. |
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| Authors: | XU Feng-Xia XU Xin-Lan HU Xiao-Ying |
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| Abstract: | Pollen morphology of five species from Magnolia is similar under LM.The sculptures are all foveolate except Magnolia grandiflora slightly coarse.The exine of the five species can be distinguished into tectum,columella and foot-layer.The puncta in the tectum are clearly seen.The colpus memberane consists of a thin foot-layer and intine while the sexine elements (tectum and columella) are reduced gradually.Spherical granules are frequently observed and mixed up with the small intraexinous spaces of several incipient columellae sometime in columella.Endexine very thin,distinct and continuous in M.grandiflora and beneath the apertural area in M.denudata.The development of columella speaks in favour of regarding the pollen of Magnolia as primitive. |
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| Keywords: | Magnolia Pollen morphology |
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