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作 者 ：杨瑞林1；魏学智2*

期 刊 ：植物研究 2015年 35卷 2期 页码：172-178

关键词：扁核木属；花粉；叶表皮；微形态；分类；

Keywords:Prinsepia Royle, pollen, leaf epidermis, micromorphology, classification,

摘 要 ：利用扫描电镜对产于中国的扁核木属4种植物的花粉形态特征以及叶表皮微观形态进行了观察研究，其中东北扁核木和台湾扁核木的花粉形态以及4种植物叶表皮微形态为首次报道。结果表明：（1）花粉均为近球形，极轴与赤道轴比值（P/E）为0.91~0.97，花粉大小为（19.62~27.30）μm×（21.53~29.59）μm，辐射对称，三孔沟型，均属赤道萌发孔，外壁纹饰均属条纹状；花粉极面观有钝三角形和三裂圆形两种类型，萌发孔有周萌发孔和角萌发孔两种类型，外壁纹饰有穿孔和无穿孔两种类型，外壁纹饰有黏液滴和无黏液滴两种类型，外壁条脊排列的紧密度、条脊距、萌发沟表面颗粒疏密度均有差异；（2）国产扁核木属4种植物可分为有表皮毛和无表皮毛两种类型，气孔形态、气孔密度、叶上下表皮角质膜、蜡质形态等方面存在较大差异。本次研究可为国产扁核木属的分类研究提供孢粉学和叶表皮微形态方面的资料，也可为引种栽培提供一些理论参考。

Abstract:We examined the micromorphology of leaf epidermis and pollen characteristics of four species of Prinsepia Royle in China by using scanning electron microscopy. Among them, it was the first time to report these above information of P.sinensis and P.utilis in Taiwan. The pollen grains were subglobose, radial symmetry, and tricolporate, the exine sculpturing was stripe with equatorial aperture, and the range of value of P/E was from 0.91 to 0.97. The size range varied within (19.62-27.30)μm×(21.53-29.59) μm. There were two types of pollen grains which were blunt- triangle and trifid round in polar view, two groups of aperture were goniotreme and peritreme, pollen had exine with perforations and exine with no pores. Two groups of pollen grains were mucus drip on the pollen exine without mucus drip. There were more differences in the density and spacing of vallate as well as the characters of colpi. Four species were divided into two types, epidermal hair or not. There were large differences between three species including the characters of cuticle, stoma density, waxy and stoma form. We provided the references about palynology and the micromorphology of leaf epidermis for classification study of native Prinsepia Royle, and theoretic basis for introduction and cultivation.

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