杨柳科（Salicaceae）7种植物次生韧皮部的比较研究  

COMPARATIVE STUDIES ON SECONDARY PHLOEM OF 7 SPECIES IN SALICACEAE

作　　者：刘东华[1] 高信曾[1] 陈耀堂[1] 

机构地区：[1]天津师范大学生物系,北京大学生命科学院植物分子和发育生物学系

出　　处：《植物研究》1994年第3期306-312,共7页Bulletin of Botanical Research

基　　金：国家自然科学基金

摘　　要：本文研究和比较了杨柳科２属７种植物次生韧皮部解剖结构．结果表明：（１）杨属和柳属植物在次生初皮部解剖上有某些共同特征：次生韧皮部具有明显分层现象；韧皮纤维和含晶细胞与筛管分子、伴胞和韧皮薄壁组织细胞是切向带相间排列；筛管分子均为复筛板，端壁倾斜平均含有７－８个筛域．（２）两属植物在射线和晶体类型上有明显区别：柳属植物次生韧皮部无石细胞；杨属植物不具功能韧皮部中含有石细胞．（３）两属植物均有一些较为原始的韧皮部解剖特征．The comparative studies of the structure of secondary phloem in 7 species of 2 genera of Salicaceae is studied.The results showed: (1) Populus and Salix. in their anatomical structures of secondary phloem,exhibit some similar features: distinct stratification in the secondary phloem;phloem fibres and crystal-containing cells in tangential bands alternating with bands of sieve clements, companion cells and phloem parenchyma cells; and sieve elements with compound sieve plates and oblique end walls bearing 7 to 8 sieve areas.(2) There are obvious differences between them in type or ray cells and crystals. Sclereids were not found in secondary phloem in Salix. and they existed in non-conducting phloem of Populus. (3) Some phloem anatomical features of the two genera are more primitive in evolution.

关 键 词：杨柳科 筛管分子 韧皮部 解剖 

分 类 号：Q949.733[生物学—植物学]