西南地区当归属植物叶表皮微形态研究

利用光学显微镜和扫描电镜对中国西南地区12种当归属植物的叶表皮微形态 (如气孔器类型、表皮细胞与气孔形状、气孔纹饰及细胞角质膜特征等) 进行了观察,测量并统计气孔长度和气孔指数. 研究结果表明当归属植物叶表皮微形态特征在种间存在较大的差异,但表皮细胞形状、气孔分布情况、气孔类型和细胞角质膜特征等是本属植物较为稳定的演化特征,可以作为物种分类与鉴别的依据. 最后根据叶表皮微形态特征列出了12种当归属植物的分种检索表.

Micro-morphological characters of leaf epidermis in Angelica from Southwest China

The leaf epidermal morphology of 12 species of Angelica in Southwest China were observed under light microscopy (LM) and scanning electron microscopy (SEM). The micro-morphological characters, such as stomata type, shape of cells and stomata, ornamentation of stomata and cuticular membrane, were investigated. The indices and lengths of stomata were measured. The results indicated that the micro-morphological characters were variant among Angelica species, but several characters were species-specific and could be used for distinguishing these species. In conclusion, the leaf micro-morphological characters showed great significance in systematics of Angelica species. In addition, a dichotomous key based on the micro-morphological characters of leaf epidermis was compiled in this paper.