青钱柳叶的结构鉴定

Identification of leaf structure of Cyclocarya paliurus

目的研究青钱柳叶片的形态结构。方法利用叶表皮离析方法、脉序离析法、石蜡制片和扫描电镜法对青钱柳叶片的形态结构进行了研究。结果青钱柳叶表皮有许多小乳突,腺毛,盾状鳞片和非腺毛表皮毛;气孔器不规则型,仅分布于下表面;靠近表皮的叶肉组织中有规律地分布含簇晶的细胞;主脉中维管组织环状,封闭,具有一个副维管束;二级脉在叶缘内分支,相互连接形成脉环,三级脉及顶型,脉间区内充满分支的自由结束的小细脉。结论首次研究青钱柳叶的结构,利用这些叶微观结构特征能够将青钱柳和胡桃科其他植物区分开来。

Objective To study the leaf morphology and structure of Cyclocarya paliurus. Methods Foliar maceration, preparation of venation order, sectioning paraffin blocks, and scanning electron microscope were used to study the leaf morphology and structure. Results Cuticular papillates, glandular hairs, peltate scales, and non-glandular hairs presented on the leaf epidermis of C. paliurus. Anomocytic stomata were confined to the lower epidermis. Large cluster crystals existed in the uppermost layer of palisade cells. Midrib included one closed vascular system and one additional vascular strand. Secondary veins are semicraspedodromous and form marginal loops, tertiary veins are percurrent, quaternary veins form orthogonal or polygonal areoles filled up by branched and freely ended veinlets. Conclusion These structure characteristics are first reported and are useful for leaf identification of C. paliurus from other Juglandaceae plants.