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Pollen Morphology and Systematic Analysis of Fifteen Sanicula Species from China
Chen YANG, Zhi-Xiang CHEN, Xue-Ying YAO, He-Shan WANG, Qi-Zhi WANG
Bulletin of Botanical Research    2020, 40 (6): 805-812.   DOI: 10.7525/j.issn.1673-5102.2020.06.002
Abstract   (2971 HTML29 PDF(pc) (4908KB)(1008)  

The pollen morphology of 15species of Sanicula was observed by light microscopy(LM) and scanning electron microscopy(SEM). The pollen size of 15 species of Sanicula was(28.51-54.29) μm-(12.23-28.98) μm, and the ratio of polar axis to equatorial axis(Polar axis/Equatorial axis) was 1.48-2.46 with a three-hole ditch. Views of pollen grains include near-rectangular, equatorial contraction, long ellipse etc. Among them, near-rectangular and equatorial contraction are the majority. Polar views are round or triangular. Under the scanning electron microscope, the outer wall surface is reticular. Our studies support that in the Saniculoideae(Apiaceae), the pollen of the genus Sanicula has moderately evolved and relatively evolved morphological features. The pollen morphology can provide palynological evidence in the classifying individual species.


Plate Ⅰ Characteristics of pollen of Sanicula grains under the SEM
1-3.S.astrantiifolia;4-6.S.chinensis;7-9.S.coerulescens;10-12.S.elata;13-15.S.elongata
Extracts from the Article
本研究选择的15个种类的花粉特征见表2。扫描电镜下花粉粒极面和赤道面的形态特征见图版Ⅰ~Ⅲ。变豆菜属植物的花粉形态变异较小,花粉粒的形状和大小,花粉的外壁纹饰等研究都没有明显的差异。
光学显微镜下观察到变豆菜属植物的花粉粒较大,极轴(P)长度多为30~45 μm,其中极轴长度最短的为28.51 μm(天蓝变豆菜,图1:7),极轴最长的是54.29 μm(台湾变豆菜,图版Ⅱ:13)。赤道轴(E)长多为15~28 μm,其中最短的是12.23 μm(川滇变豆菜,图版Ⅰ:1),最长为29 μm(红花变豆菜,图版Ⅲ),P/E值多为1.40~2.40,最高可达到2.46(川滇变豆菜,图版Ⅰ:1)。
扫描电镜下观察到变豆菜属植物表面均有纹饰,尤其以赤道区最为明显,但差异并不显著。其表面均具有网状或细网状纹饰,扫描观察极区和沟间区为条网状纹饰(图版Ⅲ:3,6,9,12,15)。
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