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| 杨柳科(Salicaceae)7种植物次生韧皮部的比较研究 | |
| 引用本文： | 刘东华,高信曾,陈耀堂.杨柳科(Salicaceae)7种植物次生韧皮部的比较研究[J].植物研究,1994,14(3):306-312. |
| 作者姓名： | 刘东华 高信曾 陈耀堂 |
| 作者单位： | 1. 天津师范大学生物系, 天津 300074; 2. 北京大学生命科学院, 植物分子和发育生物学系, 北京 100871 |
| 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。 |
| 关 键 词： | 杨柳科 筛管分子 射线 韧皮部解剖 晶体 |
| 收稿时间： | 1994-01-01 |
COMPARATIVE STUDIES ON SECONDARY PHLOEM OF 7 SPECIES IN SALICACEAE |
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| Liu Dong-hua, Gao Xin-zeng,Chen Yao-tang.COMPARATIVE STUDIES ON SECONDARY PHLOEM OF 7 SPECIES IN SALICACEAE[J].Bulletin of Botanical Research,1994,14(3):306-312. | |
| Authors: | Liu Dong-hua Gao Xin-zeng Chen Yao-tang |
| Institution: | 1. Department of Biology, Tianjin Normal University, Tianjin 30074, China; 2. Department of Plant Molecular andDevelopmental Biology, College of Life Sciences, Peking University, Beijing 100871 |
| Abstract: | 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. |
| Keywords: | Salicaccac Sieve elements Rays Phloem anatomy Crystals |
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