蜘蛛抱蛋属植物叶表皮微形态的扫描电镜观察

Studies on the micromorphology of leaf epidermis of the genus Aspidistra under SEM

在扫描电子显微镜下,观察9种蜘蛛抱蛋属植物的叶表皮微形态。结果表明,9种植物叶下表皮的细胞都为长方形,垂直壁为直的,垂周界限为凸的,外层周壁凹陷。气孔椭圆形至卵圆形,气孔外拱盖表面多平滑,其内缘近平滑、浅波状或锯齿波状;角质膜多为脊状条纹、有的外层周壁有横纹或颗粒。气孔大小与染色体的倍性有一定的正相关关系。不同种间叶表皮特征表现出一定差异,对种的划分有一定的分类鉴定意义。

The leaf epidermis of 9 species in the genus Aspidistra were examined through scanning electron microscope（SEM）. All the species were characterized by having abaxial epidermis consisting of rectangular or rhombic cells,with the radical and tangential walls being straight. The shapes of the stoma were ovate or elliptic. Ornamentation of outer stomatal rim was often smooth. The inner margin of the outer stomatal rim was nearly smooth or sinuolate,and the cuticular membrane of the leaf epidermis was often sinuolate or straited. The stomatal size was positively related with the chromosomal ploidy. Some differences were found among the 9 species,therefore,SEM characters of the leaf epidermis were of certain taxonomic significance.