虎杖营养器官的形态结构

Anatomy Structure of Vegetative Organs in Polygonum Cuspidatun

对虎杖(Polygonum cuspidatun Sieb.et Zucc.)的营养器官进行了形态解剖结构观察,结果表明:地上茎与地下茎的芽形态不同,地上茎芽无鳞片叶包被,地下茎的芽有鳞片叶包被,细胞内淀粉及簇晶多;不定根、地上茎、地下茎均有初生生长和次生生长,其结构同于双子叶草本植物的根、茎结构,但有特点;根为四原型;不定根和地下茎的周皮发达,栓质化程度高,根、茎营养器官的纤维发达;叶的形态具有多样性,在叶上除了有钉状非腺毛,还观察到头状腺毛;叶柄基部发现有花外蜜腺.

The morphological structure of vegetive organs in Polygonum cuspidatun Sieb. et Zucc. was studied by the phytotomy method in this work. The result shows that the morphology of the buds of terrestrial stem is different with that of rhizome, enwrapping by the squama leaves for the latter and not doing for the former, with more amylum in the cells of the buds of rhizome. Structures of the adventitious roots,terrestrial stems and subterranean stems are similar to that of dicotyledons, having the secondary growth and primary growth. Also, it was observed that the roots is tetrarch and the periderm of the adventitious roots and subterranean stems developed, with diversiform leaves structure on which there existed not only nail eglandulose hairs but also capitate glandular ones. Especially, the extrafloral nectary in the bases of the petioles was firstly found.