冰川退缩地26种丛藓科植物叶中肋细胞结构的研究

该研究应用离析方法,并通过光学显微镜对新疆天山一号冰川退缩地的26种丛藓科植物叶片中肋细胞的形态结构进行比较分析,结果表明:(1)丛藓科植物叶片的中肋细胞的长、宽和细胞壁厚度、纹孔场数目及细胞端尾数目在一定程度上存在着差异,反映出各中肋细胞的功能及导水作用在同属及不同属植物之间存在一定的差异。(2)中肋细胞的端尾多以及细胞壁的波状结构都具有增强细胞间的联系、提高机械固着和支撑作用。(3)不同生境下,中肋细胞侧壁的纹孔场数目能有效控制导水和物质交换的速度。这些特征可能都是冰川地区苔藓植物对恶劣生境的积极响应,具有一定的生态学和分类学意义。

Study on the Structure of Leaf Costal Cells of 26 Pottiaceae Species from Glacial Retreating Site

In this paper, the morphological structure of leaf middle rib cells of 26 species of Pottiaceae from the retreating site of No. 1 Glacier in Tianshan Mountain, Xinjiang, China, was studied by optical microscopy and segregation method. The results showed that: (1) the length and width of the middle rib cells, the thickness of the cell wall, and the number of pit fields and the end and tail of the cells reflected that there were some difference of the function and water conduction of the costal cells in same genus and among different genera. (2) The end tail of the middle rib cells and the wavy structure of the cell wall could strengthen the connection between cells and improve the mechanical fixation and supporting function. (3) In different habitats, the number of pits on the side wall of the middle rib cells could effectively control the speed of water diversion and material exchange. which might be the positive response of bryophytes in glacier areas to harsh habitats, and had certain ecological and taxonomic significance.