国产润楠属植物的叶表皮特征及其系统学意义

Leaf Epidermal Features of Machilus (Lauraceae) from China and Their Systematic Significance

对45种国产润楠属(Machilus Nees)植物的叶表皮进行光学显微镜和扫描电镜观察,其中31种为首次报道。结果表明:润楠属植物叶表皮细胞形状为多边形或不规则形,气孔复合体均为平列型且仅分布在下表皮;上下表皮细胞的垂周壁式样有5种类型:平直、圆滑、浅波、波状、平直-弓形;下表皮毛被有(稀疏、密集或非常密集)或无;上表皮平周壁纹饰类型有:点状、平滑、条纹(或波浪条纹);下表皮内面平周壁纹饰类型有:不规则、平滑、粗糙网状、微毛状、颗粒状、鳞片状。这些特征在本属种间存在较显著的差异,可作为区分种类的辅助特征和种间亲缘关系,因而对润楠属植物的分类学研究和亲缘关系的确定有较大意义。

Leaf epidermis of 45 species of Machilus Nees were observed under light microscope （LM） and scanning electron microscope （SEM）, of which 31 species were reported for the first time. The results showed that leaf epidermal cells were polygonous or irregular in shape. Stomatal complexes only present on abaxial epidermis and the stomata was paracytic type. There were five types of anticlinal walls of abaxial and adaxial cells （straight, rounded, undulated, sinuous, straight-curved）. Trichomes on abaxial epidermis exist （sparse, dense or very dense） or not. Ornamention types of periclinal walls could be divided into punctuate, smooth and striate （or wavy striate）. Ornamention of periclinal walls on inner side of abaxial epidermal cells varied widely （irregular, smooth, roughly reticular, micro hairy, granular, scaly）. These characters could help to discriminate different species and reveal the relationship within Machilus. Therefore, they were of significance in studying on classific＇ation and phylogenetic relationship of Machilus.