19个木莲属树种的花粉形态观察及其分类学意义
摘要： 通过对19个木莲属树种的花粉进行扫描电子显微镜观察拍照，观察描述花粉的形态学特征，测量花粉极轴与赤道轴长度、花粉表面孔穴和突起的密度并据此进行聚类分析。扫描电子显微镜下形态学观察结果表明：木莲属19个种的花粉均为舟形，且具有长及两端的远极萌发单沟等一致特征，花粉表面孔穴、突起等特征在种内部比较稳定，不同种之间差异明显，具有一定的分类学意义，但作为属下分类依据需慎重。聚类分析结果表明：相同地区或分布地域相近的树种花粉特征更相近，证明的遗传分枝与地理分布有很强的相关性。
关键词: 木莲属, 花粉形态, 分类
Abstract: We studied the pollen morphology of 19 species of Manglietia with scanning electron microscope(SEM), and measured the pollen size and densities of cavity and protuberance. The hierachical cluster analysis(HCA) was done based on the metrical data. Under SEM, all the pollens appear as boats, each pollen has a sprout channel whose length almost equal to the longer axis of pollen, the characters of pollen surfaces such as cavity and protuberance are steadily in same species, but there are some visible differences among pollen of different species. The result of HCA shows that the pollen morphology characteristics of the different species distributed in the same geographical region or similar areas have more similarities department, and there is a strong correlation between genetic branches and geographical distribution.
Key words: Manglietia, pollen morphology, taxonomy
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