木兰科植物的叶表皮特征及其分类学意义

Characters of leaf epidermis of Magnoliaceae and its taxonomic significance

在光学显微镜下观察了木兰科Magndiaceae7属16种植物的叶表皮特征。结果表明:木兰科植物叶表皮细胞形状不规则,垂周壁呈不同程度的波状弯曲;气孔器分布于下表皮,其长轴取向不规则,除鹅掌楸Liriodendronchinense为平列型与无规则型并存外,均为平列型;不同属种的上下表皮细胞大小、细胞垂周壁的波状弯曲程度和气孔器密度均存在差异,可为属种的划分提供实验证据。

.The characters of leaf epidermis of 7 genera 16 species in the Magnoliaceae are studied under the optical microscope. The results indicate that the shapes of the epidermal cells are irregular, and the anticlinal walls are wave-shaped curves to different degrees. The stomatal apparatuses in the lower surface of the leaves are irregularly oriented in their long axes.Except that Liriodendron chinense has both anomocytic and paracytic types, all other species are of paracytic types. The size, the waved extent of anticlinal walls, and the density of stomatal apparatus of epidermal cells are different in 7 genera 16 species, so they could serve as a criterion of distinguishing genera and species in the Magnoliaceae.