加拿大一枝黄花形态解剖学研究

Morphoanatomical study of Solidago canadensis

关键词:  加拿大一枝黄花  形态  解剖结构  特征

Key words:  Canada goldenrod  morphology  anatomical structure  characteristic

摘要:

利用光镜和电镜对金棒草的形态结构进行了研究。研究表明:金棒草叶具有厚的角质层和长的表皮毛,可以防止昆虫取食,叶片内有发达的维管束和束鞘延伸,增加了产物的输导能力; 茎具有行使输导和支持能力强的结构特征:次生结构发达,具分隔纤维和附物纹孔,单穿孔占94.9%,平穿孔板占50.9%,互列式纹孔导管占53.8%; 主根地下逸生结构发达; 成熟花粉粒外有胼胝质包被,有利于花粉传播,花粉粒属于较为进化的类型。

Abstract:

Morphological and anatomical characteristics of Canada goldenrod(Solidago canadensis)was studied by light microscope(LM)and scanning electron microscope(SEM). The result showed that its leaves had thicked cuticle and long epidermal hairs which could prevent it from feeding by insect,and developed vascular bundles with bundle sheath extension distribute in leaves,such structure could enhance conducting capability of photosynthate. Its stem had structural characters of high ability to transport and support,the characters could be described as follows:developed secondary structure with septate fiber and vestured pit,simple perforation taking up 94.9%,level perforation plate 50.9%,and alternate pitting vessel 53.8%.Abundant adventitious structure derived from axial root underground in a early phase. Mature pollen grain,enveloped by callose and small in volume,belongs to evolutional type.