白花前胡营养器官结构及其分泌道分布规律的研究

运用石蜡切片方法,观察白花前胡营养器官的显微结构及其分泌道的分布特征,以明确营养器官内分泌结构的分布规律,为揭示白花前胡次生代谢产物的积累提供解剖学依据。结果表明,(1)白花前胡成长根从外到内由周皮、中柱鞘薄壁组织和次生维管组织组成,而且中柱鞘薄壁组织不同于一般双子叶植物根的结构;茎从外到内由表皮、皮层和维管柱组成;叶为异面叶结构。(2)白花前胡根、茎及叶中均有分泌道存在,分泌道在根中分布于中柱鞘薄壁组织和次生韧皮部中,茎中分布于皮层和髓中,叶中分布于维管束上下两侧的薄壁组织中。

Structures of Different Vegetative Organs of Peucedanum praeruptorum Dunn and the Distribution Law of Secretory Canals in Different Organs

The structures of different vegetative organs and the distribution law of secretory canals in different vegetative organs of Peucedanum praeruptorum Dunn were investigated by paraffin section method.The results showed that:1)the taproot of P.praeruptorum Dunn was formed by periderm,pericyclic parenchyma tissue and secondary vascular tissue from outside to inside and the pericyclic parenchyma tissue was a structure that was different from the common structure of herbaceous plants in dicotyledon.The stem was composed of epidermis,cortex and vascular tissues from the exterior to the interior;the leaf was a bifacial leaf.2)There were secretory canals in all vegetative organs of P.praeruptorum Dunn,including the root,the stem and the leaf.The secretory canals were distributed in pericyclic parenchyma tissue and in secondary phloem of the root;in the stem,they were in the cortex and the pith;and in the leaf,they were in the parenchyma around the vascular.The research could offer the anatomic data for discussing the relationship between the distribution of secretory structure and the accumulation of secondary metabolites.