| 白头翁属的花粉形态研究 |
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| 引用本文： | 席以珍.白头翁属的花粉形态研究[J].中国科学院研究生院学报,1985,23(5):336-343. |
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| 作者姓名： | 席以珍 |
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| 作者单位： | (中国科学院植物研究所，北京) |
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| 摘 要： | 白头翁属(Pulsatilla Mill．)花粉共有4个萌发孔类型：1．三沟类型; 2．散沟类型;
3．散孔类型; 4．二型花粉类型。各类型之间的演化趋势是：三沟→散沟→散孔类型。外
壁表面具大、小两型小刺和小穿孔。根据外壁表面小刺的粗细和小穿孔的分布，可将本属分
为两个类群，即一类为表面呈波浪状，小刺较粗，基部具垫状隆起，小穿孔分布在隆起之间的低
凹处; 另一群外壁表面平，刺较细，排列稀，小穿孔均匀分布在花粉的表面上。利用透射电镜观
察本属三沟型和散孔型的外壁内部结构是一致的，即都由薄的内层与厚的外层组成。内层在 沟和孔下面均加厚，在沟间区和孔间区变薄。外层包括覆盖层、柱状层和基层。
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| 关 键 词： | 白头翁属 花粉形态 |
Studies on Pollen Morphology of Pulsatilla Mill. |
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| Xi Yi-Zhen.Studies on Pollen Morphology of Pulsatilla Mill.[J].Journal of the Graduate School of the Chinese Academy of Sciences,1985,23(5):336-343. |
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| Authors: | Xi Yi-Zhen |
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| Institution: | (Institute of Botany, Academia Sinica, Beiling) |
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| Abstract: | Pollen grains of 18 species of Pulsatilla in Ranunculaceae distributed
in Asia and Europe were examined by LM and SEM, and exine ultrastructure of tri-
colpate pollen grains of P. chinensis and of pantoporate pollen grains of P. campanella
was examined by TEM. Pulsatilla pollen is divided into four major types based on the
aperture character, i.e. tricolpate, di- and tricolpate, pantocolpate and pantoporate. The
revolutionary trend of pollen types is as follows: tricolpate→pantocolpate→pantopo-
rate. Surface spinulate and perforate. According to density and size of sptnulae and
distribution of perforation, the pollen grains of the genus can be divided into two gro-
ups. Thin sections of P. chinensis and P. campanella show endexine thickened at
colpi and ora. Ektexine consists of a foot layer, a collumellae layer and a continuous,
perforate tectum. The columallae layer is thicker than foot layer and tectum. Pollen
morphology of Pulsatilla is similar to that of Anemone, but different in the distribution
of spinules and perforation. Pollen information supports Wang’s view about systema-
tic arrangment of species of Pulsatilla in China. |
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| Keywords: | Pulsatilla Pollen morphology |
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