小花山桃草营养器官解剖结构及其生态适应性研究  

Anatomical Structures of Vegetative Organs and Ecological Adaptation of Gaura parviflora

作　　者：黄萍[1] 沈俊辉[1] 顾东亚[1] 吕明锦[1] 叶永忠[1] 

机构地区：[1]河南农业大学生命科学学院,郑州450002

出　　处：《植物研究》2009年第4期397-401,共5页Bulletin of Botanical Research

基　　金：国家重点基础研究发展规划项目"外来植物物种编目与生态安全评价"(G200048603-4)

摘　　要：通过石蜡切片法对外来入侵植物小花山桃草进行解剖学方面的研究,旨在揭示其入侵和蔓延的结构基础。结果表明:小花山桃草根的次生结构中次生木质部所占比例较大,约占整个横切面的2/3,导管数量多,平均达138.25个,管腔大,管径为85.37μm;根和茎的木栓层均较发达,由6～7层扁平细胞组成;根和茎的次生韧皮部中存在大量含针晶细胞;小花山桃草的叶具典型的旱生植物叶片的结构特征:表皮为复表皮,上下表皮均有气孔分布,上表皮气孔密度为180mm-2,下表皮气孔密度为266mm-2;栅栏组织为双栅型,近轴面栅栏组织细胞2～3层,排列紧密而整齐,含叶绿体较多;叶片主脉木质部发达,由多列导管组成。上述特征说明小花山桃草的解剖结构对干旱生境有较强的适应性。Gaura parviflora is one of the invasive plants, the anatomical structure of its vegetative organs was studied by the methods of paraffin section. The results showed that ： In the secondary structure of the roots of G. parviflora,there was a larger proportion of secondary xylem, about two thirds of the entire cross section, the num- ber of vessels averaged 138.25, and the lumen diameter was 85.37μm; The cork of the roots and stems were both developed, which was composed of 6 to 7 layers of flat cells; there were many parachyma cells containing needle crystals in the secondary phloem ; The leaves of G. parviflora had the typical characteristics of xerophytes leaves： the multiple epidermis; the stomata existed in both upper and lower epidermis,whose densities were 180 ram-2 and 266 mm-2, respectively; the palisade tissue was two-side palisade which included 2 to 3 layers of cylindrical cells in the upper side, with a lot of chloroplasts; the main vein of leaves had well developed xylem , with a number of radial arranged vessels. The characters mentioned above showed that G. parviflora adapted well to the dry environment.

关 键 词：小花山桃草 石蜡切片 解剖结构 

分 类 号：Q948.1[生物学—植物学]