胡杨茎次生维管组织特点与生境之间的关系  

Relationship between Anatomical Structures of Populus euphratica and Ecoenvironment

作　　者：王桂芹[1] 郑玉华[1] 胡顶超 

机构地区：[1]安徽科技学院生命科学学院,凤阳233100

出　　处：《植物研究》2015年第1期11-15,共5页Bulletin of Botanical Research

基　　金：国家自然科学基金项目(31370433)

摘　　要：利用光学显微技术、电镜扫描技术和组织化学鉴定技术,对胡杨(Populus euphratica Oliv.)茎次生维管组织特性与生态适应性之间的关系进行了研究。结果表明:胡杨茎次生维管组织具有诸多适应生态环境的结构特征及管状分子的特性。次生韧皮部与次生木质部厚度比是1/7,韧皮纤维发达;薄壁组织中含蛋白质的细胞丰富;胡杨的茎材中具有比较少、但直径较大、管壁较厚的导管,且管孔多为径向排列的复管孔;胡杨茎的次生木质部形成了以复管孔为主、管胞和束状管胞为辅的管状复合体;木射线残存或演变为纤维管胞;导管存在2种类型,主要为孔纹式,偶见梯纹—孔纹式导管,单穿孔板端壁平截,同时导管分子短。上述特点均说明胡杨次生维管组织结构和管状分子表现出了对特定生境的进化适应。We used light microscope, scanning electron microscope and histochemical localization techniques to study the relations between secondary vascular tissue and the ecological adaptation of Populus euphratica. P. euphratica has many structural characteristics and tuber member characteristics, which are adapt to ecological environment. The ratio of secondary phloem with developed phloem fiber to secondary xylem is 1/7 in width, and much cells with rich protein distributed in parenchyma. Less vessels in large diameter, with thick wall and multiple-pore distributed in the wood arranged radially, as a result, the tubal complex, mainly multiple-pore, supplemented by tracheid or bundle tracheid, was formed in secondary xylem of P. euphratica＇ stem, while the xylem ray remained or evolved into fibrous tracheid. There are mainly pitted vessels in stem, occasionally trapeziform-pitted type, and both type vessels are very short with truncatus and leveled-perforation. The characteristics descripted above can explain the evolution and adaptation of secondary vascular tissue and tuber members of P. euphratica in a specific habitat.

关 键 词：胡杨 次生维管组织 解剖结构 管状分子 生境 

分 类 号：Q944.5[生物学—植物学]