中国棱子芹属植物叶表皮微形态特征及其系统学研究  

Characters of Leaf Epidermis and Systematic Research in Pleurospermum from China

作　　者：任海燕[1] 逄云莉[1] 何兴金[1] 邓贤兰[1] 张宇澄[1] 

机构地区：[1]四川大学生命科学学院,成都610064

出　　处：《西北植物学报》2009年第1期49-60,共12页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金资助项目(30670146);国家自然科技资源平台资助项目(2005DKA21403)

摘　　要：采用光学显微镜和扫描电镜对棱子芹属(Pleurospermum)11种植物的叶表皮微形态特征进行了观察研究。结果表明:(1)显微观察显示,气孔器普遍存在于叶的下表皮,少数种的上表皮也有分布,多为无规则型;叶表皮细胞形状为多边型或不规则形,垂周壁式样可区分为近平直、平直-弓形、浅波状和波状。(2)扫描电镜观察显示,叶表皮气孔器外拱盖内缘为近平滑、浅波状或波状;角质膜条纹状,有的条纹隆起,有的条纹上附有颗粒和晶簇。(3)气孔器的分布、气孔器外拱盖内缘形态以及角质膜等特征对该属部分种的区分有一定的参考价值。(4)结合外部形态特征,推测康定棱子芹应作为种一级分类群,松潘棱子芹与宝兴棱子芹的亲缘关系比较近。Epidermal characters of mature leaves in 11 species of Pleurospermum were investigated under both light microscope （LM） and scanning electron microscope （SEM）. It was shown that the stomata were anomocytic and existed in abaxial epidermis in all the species examined, and in the adaxial epidermis in some species. The leaf epidermal cells were usually irregular or polygonal in shape. The patterns of anticli- nal walls were slightly straight, straight-arched, sinuolate or sinuous. Under SEM, the inner margin of the outer stomatal rim was nearly smooth,sinuolate or sinuous,and the cuticular membrane of the leaf epidermis was stripe, sometimes stripe apophysis,occasionally granules,druse. Stomatal and other epidermal features can be used for distinguishing some species. In the light of our studies both on micromorpha and external morpha,we suggest retaining P. prattii and P. wrightianurn as separate species and P. franchetiahum and P. davidii are closed related.

关 键 词：棱子芹属 叶表皮 系统学研究 

分 类 号：Q944.56[生物学—植物学]