中国黄耆属簇毛黄耆亚属的叶表皮特征及其系统学意义(英文)

Leaf Epidermal Feature of Astragalus L. Subgenus Pogonophace Bunge(Leguminosae) from China and Its Systematic Significance

在光学显微镜和扫描电镜下,观察了国产黄耆属簇毛黄耆亚属16种1变种的叶表皮特征。结果表明,气孔器在各种植物的上、下表皮均有分布,多为无规则型,也有不等细胞型;叶表皮细胞形状有不规则形与多边形,表皮细胞垂周壁有平直、浅波状、波状或深波状。叶表皮细胞形状与垂周壁的式样可以分为四种类型,这四种类型与亚属的分组有一定的对应关系。在扫描电镜下可见表皮细胞上有角质层,气孔下陷,气孔的外拱盖及其内缘特征在亚属内都比较一致。表皮细胞角质层的纹饰在个别类群中有一定的变异,对种类的鉴定有一定的意义。

The leaf epidermis of 16 species and 1 variety of Astragalus subgenus Pogonophace was investigated by the light microscopy （LM） and partially by the scanning electron microscopy （SEM）. The result shows that the stomatal apparatus of these species are present in both abaxial and adaxial epidermis. It is shown that the leaf epidermal cells are polygonal or irregular in shape. The patterns of anticlinal walls are straight, sinuous or sinu- ate. Based on the shape and the anticlinal wall patterns of the epidermis cells, there are four types of epidermis can be recognized. The four epidermis types are consistent with the sections of Pogonophace to some extent but not all. Under SEM observation, because of the cuticular layer of the leaf epidermis, the stomatal apparatus is at a lower place. The outer stomatal rim and its inner margin of these species are almost the same. In a few species, the cuticular layer of the leaf epidermis has a special appearance. Therefore, this character can be used as a criterion to identify these species in Pogonophace.