氮素对短葶飞蓬生长和次生代谢产物积累的影响

以不同氮素供应对短葶飞蓬(Erigeron breviscapus)进行了人工栽培试验,探讨氮素对药用植物生长和次生代谢产物含量及产量的影响作用规律.结果显示:氮素施用量与短葶飞蓬植株生物量呈极显著的正相关;而与灯盏乙素和总咖啡酸酯含量则表现出显著的负相关;对总咖啡酸酯和灯盏乙素的产量没有显著的促进作用.植株灯盏乙素和总咖啡酸酯含量与生物量呈现极显著的负相关;与植株含氮量也存在极显著的负线性关系,变化规律与"碳素/营养平衡假说"预测的一致.研究表明,植株生长与次生代谢有效成分积累间存在一定的权衡关系,过多的施用氮肥提高药材产量时将会导致黄酮等酚类次生代谢有效成分含量下降.

Effects of Nitrogen on the Growth and Accumulation of Secondary Metabolites of Erigeron breviscapus（Compositae）

Erigeron breviscapus a medicinal plant was planted under different nitrogen levels to investigate effects of nitrogen on the growth and the accumulation of secondary metabolites,address the relationship between them in medicinal plants in the plantation. Results showed that the amount of N fertilizer was significantly positively correlated with the biomass,but negatively to contents of total caffeates and scutellarin of E.breviscapus Moreover,increasing amount of N fertilizer did not significantly enhance yields of 2 active constituents. The biomass was negatively correlated with contents of total caffeates and scutellarin. Contents of total caffeates and scutellarin were negatively correlated with contents of N in E.breviscapus,as predicated by the carbon/nutrient balance hypothesis. The result suggested that the nitrogen addition could increase the biomass yield,nevertheless,decrease active constituents （ flavonoids ）,there could be a trade off between the growth and accumulation of secondary metabolites in medicinal plants.