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Position: Home > Articles > Anatomical Structures of Vegetative Organs and Ecological Adaptation of Gaura parviflora Bulletin of Botanical Research 2009,29 (4) 397-401

小花山桃草营养器官解剖结构及其生态适应性研究

作者：

黄萍;沈俊辉;顾东亚;吕明锦;叶永忠

单位：

河南农业大学生命科学学院

关键词：

小花山桃草;石蜡切片;解剖结构

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。

译名：

Anatomical Structures of Vegetative Organs and Ecological Adaptation of Gaura parviflora

作者：

HUANG Ping SHEN Jun-Hui GU Dong-Ya L Ming-Jin YE Yong-Zhong(College of Life Science,Henan Agriculure University,Zhengzhou 450002)

关键词：

Gaura parviflora;paraffin section;anatomical structure

摘要：

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 number 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 180mm-2 and 266mm-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.

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小花山桃草营养器官解剖结构及其生态适应性研究

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