银杏分泌腔的超微结构特征及与分泌物积累的关系  

THE ULTRASTRUCTURE OF SECRETORY CAVITIES OF GINKGO BILOBA AND ITS RELATION TO THE SECRETORY PRODUCTS

作　　者：彭方仁[1] 郭娟[1] 黄金生[1] 周坚[1] 

机构地区：[1]南京林业大学森林资源与环境学院,南京210037

出　　处：《林业科学》2003年第5期18-23,T001-T003,共9页Scientia Silvae Sinicae

基　　金：国家自然科学基金资助项目 ( 3 980 0 115 )

摘　　要：在光学显微镜和电子显微镜下对银杏叶片分泌腔的发生发育进程、超微结构特征及与分泌物积累的关系进行了系统研究。结果表明 :银杏叶片分泌腔是以裂溶生方式发生、发育。首先 ,原始分泌细胞团中央几个细胞的胞间层膨胀、溶解 ,形成裂缝状胞间隙 ;然后 ,分泌细胞的胞间层继续溶解 ,胞隙增大 ,同时中央的一些分泌细胞退化、溶解、脱落于腔内。银杏分泌腔内分泌物的合成主要在分泌细胞的质体和内质网中进行 ,但线粒体、高尔基体和细胞质也似乎参与分泌物的合成和转输。当分泌物在质体或内质网上合成后 ,以小泡形式接近质膜 ,并与质膜融合 ,释放分泌物于质膜和细胞壁之间 。The origin, development and the ultrastructure of secretory cavities in leaf of Ginkgo biloba and its relation to the secretory products were studied under light and electron microscopes. The results indicated that the formation pattern of the secretory cavities was schizo lysigeneous. First, some original secretory cells in the center of secretory cavities began to expand and dissolved, and small spaces appeared between the cells. Then more secretory cells dissolved and made the space larger, meanwhile the former secretory cells in the center degenerated, autolyzed and sloughed off in the cell spaces. The secretory product in the secretory cavities of G. biloba was mainly synthesized in ER and plastids. More or less, mitochondria, Golgi body and ground cytoplasm also took part in the synthesis and transportation of secretory products. After synthesized in ER and plastids, the secretory products approached the plasmalemma and fused their membranes with the latter in the form of small vesicles, and then was eliminated to the spaces between the plasmalemma and the wall. At last the secretory products percolated through the wall that faded into an even looser mesh of fibrillar material toward the cavity.

关 键 词：银杏 分泌腔 超微结构特征 分泌物积累 光学显微镜 电子显微镜 

分 类 号：S664.3[农业科学—果树学]