水芹适应湿地环境的解剖和屏障结构组织化学特征研究

Studies on Anatomy and Apoplastic Barrier Histochemistry Characters of Oenanthe javanica (Bl.)DC. Adapted to Wetland Environment

利用普通光学显微镜和荧光显微镜对水芹的根、茎进行解剖结构和屏障结构研究。结果表明:水芹不定根为初生结构,具二、三原型维管柱、内皮层、皮层、皮下层和表皮;茎亦为初生结构,具髓腔、皮层(皮层内有通气组织、散生维管束、厚角组织)和表皮。水芹体内气腔包括不定根的通气组织、茎内髓腔和皮层的通气组织。水芹的屏障结构包括不定根内侧具凯氏带且栓质化的内皮层,外侧不同发育时期的表皮栓质层、木质化皮下层和气腔周围细胞壁栓质层;茎的角质层和木质化厚角组织。水芹的体内气腔和质外体屏障结构是其适应湿地环境并改善湿地通气的重要结构保证。

The anatomy and apoplastic barrier of Oenanthe javanica（Bl.）DC. roots and stems were studied by optical and epifluorescence microscopes.The results showed that the adventitious roots were primary structure of O. javanica（Bl.）DC.,and had diarch and triarch vascular cylinder,endodermis,cortex,hypodermis and epidermis.Its stems were also of primary structure,and had pith cavity,cortex,and cortex with aerenchyma and scattered vascular bundles,collenchyma and epidermis.The air spaces in vivo included aerenchyma in adventitious roots and pith cavity and cortical aerenchyma in stems.The apoplastic barriers in adventitious roots included the inner layers of endodermis with Casparian bands and suberin,and the outer layers were consisted of suberized epidermis,lignified hypodermis and suberized walls around aerenchyma in different development stages,and cuticle and lignified collenchyma in stems.The in vivo air spaces and apoplastic barriers are important sturactural assurances for O. javanica（Bl.）DC. to adapt to wetland environment and improve wetland aeration.