叶表皮细胞结构在国产狗尾草属(Setaria Beauv.)分组水平上的应用

本文对狗尾草属国产15种进行叶表皮细胞结构的显微观察,作为狗尾草属内分组特征之一。研究结果是:1.进一步证实叶表皮脉间细胞的形态是禾本科属下分类的好特征,2.国产种类叶表皮细胞形态为六个类群,基本上符合外部形态所分成的六个组,其中个别种类出现的分化现象,也正好说明其彼此的演化关系。

THE STUDY LEAF EPIDERMIS AT THE SECTIONAL LEVEL ON CHINESE SETARIA

This paper is attempted to study the leaf epidermis about 15 species of Chinese Setaria by current method. The results of our study are summarized as follows:1. The six groups of the structure of leaf epidermis are equal to the six sections of the structure of inflorescence and spikelets in Setaria. 2. The long-cells of different shape, size and the nature of their wall can show the features to divide the subtribe, genus or species exactly. 3. In the structure of leaf epidermis of Setaria especially the shape of the long-cells, the section of Ptychophyllum (A.Braum) Stapf should be as an independent section, the section of Setaria is similar to section Paurochaetium (Hitchc. & Chase) Pilger, section Pennisetoides Tzvel, and section of Panicatrix Stapf, the section Laxispiculosae S. L. Chen et G. Y. Shang is similar to section Pennisetoides Tzvel. by its adalial epidermis and similar to section Sctaria by its abaxial epidermis.