[Effects of water stress and nitrogen nutrition on regulation of Catharanthus roseus alkaloids metabolism].

Objective: Under various drought conditions and nitrogen application, the content of vindoline, catharanthine, vincristine and vinblastine in the leaf of Catharanthus roseus were illustrated to improve the content of alkaloid theoretically.

Method: Six groups were set in the experiment, which included: CK (natural control), CN (natural control + nitrogen), LK (low drought), LN (low drought + nitrogen), HK (high drought), HN (high drought + nitrogen) to discuss the change characteristics of total nitrogen, the activity of alkaline POD and TDC, the content of four alkaloids under the different conditions were measured.

Result: Under LK condition, the activity of POD, TDC were enhanced.

[Effect of enhanced UV-B radiation on metabolism and berberine content of Coptis chinensis].

Objective: To reveal the response of content berberine in root of Coptis chinensis to different intensity of UV-B radiation, and provide the theory basis for promoting the content of berberine.

Method: Four groups of UV-B radiation were set in the experiment which included: natural light control (0 W x m(-2)), UL (0.05 W x m(-2)), UM (0.