中文摘要：

药用植物次生代谢途径及其调控机制的研究基础薄弱，阻碍了代谢工程在获取高价值次生代谢产物的广泛应用。生物碱是存在于药用植物中的一类含氮杂环化合物，具有抗肿瘤、抗微生物、降血压、解痉镇痛等药理作用，备受研究者的关注。应用代谢工程手段改善代谢途径，提高次生代谢产物的量，对优化药用植物种质资源以及可持续发展具有重要价值。通过对药用植物生物碱类化合物的代谢合成途径进行综述，并讨论生物碱代谢工程的研究方法和调控策略，为药用植物生物碱相关研究提供参考。

英文摘要：

Since the weak research basis on metabolic pathway and regulation mechanism of medicinal plants,obtaining valuable secondary metabolites from medicinal plants by metabolic engineering technology is seriously impacted.Alkaloids are nitrogen heterocyclic compounds in medicinal plants,which have pharmacological effects,such as anti-tumor,anti-microbial,anti-hypotensive,spasmolysis analgesia,etc.It is valuable for optimizing the germplasm resource of medicinal plants and their sustainable development by using metabolic engineering methods to influence the metabolic pathways in order to increase the content of secondary metabolites.The synthetic metabolic pathways about alkaloids of medicinal plants were reviewed in this paper,as well as research methods and regulation strategies,for giving some references to relative studies on alkaloids from medicinal plants.