中文摘要：

以来自山东沂源、泰安、济南的6株叶籽银杏的正常种子和叶生种子为试材,通过扫描电镜对两种类型种子的中种皮和内种皮进行了超微结构比较研究。研究发现,正常种子的中种皮均是由管胞构成,管胞壁上具有明显的穿孔,为具缘纹孔。而叶生种子的管胞类型则存在差异,织女洞、仲庄、济南、泰安取材的叶籽银杏的叶生种子管胞有具缘纹孔管胞和螺纹管胞两种类型。从油坊、白峪取材的叶籽银杏的叶生种子的管胞类型和正常种子一样,是由具缘纹孔管胞构成。就管胞长度和管胞直径而言,叶生种子比正常种子有更大的变异。6株叶籽银杏的内种皮超微形态也存在较大的差异。基于研究结果,对叶籽银杏的管胞演化和系统学意义进行了讨论。

英文摘要：

The comparative ultrastructure of sclerotesta and endotesta of Ginkgo biloba var. epiphylla Mak. were studied,which involved both normal seeds and epiphyllous seeds from 6 individuals of Ginkgo biloba var. epiphylla.The research showed that normal seeds in 6 individuals consist of tracheid with bordered pit. However,difference was noticed between epiphyllous seeds. There were two types of tracheid,i.e. tracheid with bordered pit and spiral tracheid in the sclerotesta of Ginkgo biloba var. epiphylla in Zhi＇ndong,Zhong＇zhuang,Ji＇nan,Tai＇an,but there was only tracheid with bordered pit in sclerotesta in both normal seeds and epiphyllous seeds of Ginkgo biloba var. epiphylla in You＇fang and Bai＇yu. In respect to tracheid length and tracheid diameter,greater variation was observed in epiphyllous seeds than that of normal seed. In addition,difference was also observed in endotesta. Based on the research,tracheid evolution and systematic significance of Ginkgo biloba var. epiphylla were discussed.