刺苦草营养器官的解剖研究

Anatomical researches of vegetative organ of Vallisneria spinulosa

利用植物解剖学的方法对刺苦草的根、匍匐茎、叶及块茎4种营养器官的解剖结构进行了研究。结果表明,刺苦草不仅具有典型水生单子叶植物的结构,而且不定根发达,匍匐茎多节。越冬的块茎基本组织细胞中富含单粒淀粉粒。全株通气组织发达,维管束结构简单,木质部退化或缺少,无机械组织发育。根据解剖结构分析,苦草属的越冬芽应称为"块茎"。

The structural features of root,stolon,leaf and tuber of Vallisneria spinulosa were analyzed with plant anatomy.The results showed that Vallisneria spinulosa had structural characteristics of aquatic monocotyledon with well-developed adventitious root and multi-node stolon.The single grain starch granules were rich in the basic tissue of winter tuber.The aerenchyma is well developed,vascular structure is simple,xylem is degraded or absent and mechanical tissue is not developed in whole-plant.The Vallisneria spinulosa＇s winter buds are proposed to be defined as ＂tubers＂.