天胡荽的解剖和屏障结构特征研究  

A study of anatomical structure and apoplastic barrier characteristics of Hydrocotyle sibthorpioides

作　　者：杨朝东[1] 李守峰 姚兰[3] 艾训儒[3] 蔡小东[1] 张霞[1] 

机构地区：[1]长江大学园艺园林学院,湖北荆州434025 [2]湖北省保康县林业局,湖北保康441600 [3]湖北民族学院林学园艺学院,湖北恩施445000

出　　处：《草业学报》2015年第7期139-145,共7页Acta Prataculturae Sinica

基　　金：湖北省教育厅项目(Q2014310)资助

摘　　要：利用光学显微镜和荧光显微镜对天胡荽进行了解剖学和组织化学研究,结果表明,1)天胡荽不定根为初生结构,具二原型维管柱、内皮层、皮层、外皮层和表皮。2)茎、花柄和叶主要为初生结构,除了茎和花柄维管束具次生结构,具表皮、厚角组织、皮层、内皮层、维管束和髓;茎具诱导型通气组织。3)天胡荽不定根的屏障结构包括内侧的有凯氏带且栓质化的内皮层,外侧的有凯氏带且栓质化的外皮层和紧邻外侧具扩散状栓质层的表皮细胞;匍匐茎、花柄和叶柄具相似的质外体屏障结构,一是内侧的有凯氏带且栓质化的内皮层,二是外侧的表皮外角质层,但花柄和叶柄有凯氏带的细胞,并不栓质化;叶片的仅为表皮外角质层。4)天胡荽的解剖和屏障结构特征是其适应多种水湿环境的结构基础。该研究为今后选择湿地生态修复植物提供线索。The anatomy and histochemistry of Hydrocotyle sibthorpioides were investigated under light and flu-orescence microscopy in this research.The findings were：1）The adventitious root of H .sibthorpioides con-sisted of proto-xylem and proto-phloem,superceded by diarch primary vasculature of metaxymlem and metaph-loem,surrounded by endodermis,then cortex,exodermis and epidermis.2）Stolon,pedicel and leaf were pri-mary structures with epidermis,collenchyma,cortex,endodermis,vascular bundle and pith,except that vas-culature of the stolon and pedicel had secondary structures,and stolon had induced aerenchyma.3 ）The ap-oplastic barriers in adventitious roots of H .sibthorpioides included the inner layers of endodermis with Caspar-ian bands and suberin,the outer layers of exodermis with Casparian bands and suberin and the epidermis with suberin.The stolons,pedicels and petioles had similar apoplastic barriers,including the inner layer of endodermis with Casparian bands and suberin,and the outer layer of the cuticle,but the endodermis had no suberin in pedicels and petioles;leaf blades had only a cuticular apoplastic barrier.4）The anatomical structure and apoplastic barrier characters are important structural determinants of adaptation of H .sibthorpioides to variably-moist environments.The implications of this research for selection of plant species to restore degraded wetlands are discussed.

关 键 词：天胡荽 解剖结构 质外体屏障结构 组织化学 初生结构 

分 类 号：S688.4[农业科学—观赏园艺]