野丁香属植物叶表皮形态特征研究

Leaf Epidermal Morphology of Leptodermis Wall. (Rubiaceae)

摘要:

在光学显微镜和电子扫描显微镜下观察了茜草科(Rubiaceae)野丁香属(Leptodermis Wall.) 35种8变种植物的叶表皮微形态特征。结果表明,野丁香属植物叶表皮细胞为多边形或不规则形状,垂周壁平直、弓状或波状。气孔器全部位于下表皮,有辐射型、平列型两种,其中平列型较为普遍。表皮毛在上下表皮都有分布,有单细胞毛和单列多细胞毛两种类型。角质膜为颗粒状、网状或乳突状。野丁香属植物叶表皮的微形态特征存在种间差异,可为物种分类和系统演化分析提供更为有用的证据。

关键词:叶表皮形态;分类;野丁香属;茜草科

Abstract:

The leaf epidermal characters of 35 species and 8 varieties of Leptodermis Wall. (Rubiaceae) were observed under light and scanning electron microscopes. The results showed that leaf epidermal cells were either polygonal or irregular, with straight, arched, or sinuous anticlinal walls. The leaves were hypostomatic, with both of paracytic and actinocytic stomata. The trichomes distributed ad- and abxially epidermis were either simple unicellular or uniseriate multicellular. Leaf cuticular membrane was granular, reticulate, or papilliform. These characters exhibit interspecific variation among Leptodermis species and it could provide informative evidence for taxonomic and systematic analysis.

Key words:Leaf epidermal morphology;Taxonomy;Leptodermis;Rubiaceae