长期以来，l-龙脑含量和药材产量低是限制艾纳香产业发展的主要原因。本课题组前期研究已证实，外源镁可以显著提高艾纳香中l-龙脑含量和药材产量，但是其调控机制尚未明确。因此，本项目拟以艾纳香为研究材料，采用水培方式，叶面喷施镁元素及动态监测等手段，一方面，从植物次生代谢途径，探讨外源镁对l-龙脑及其生物合成中的关键酶龙脑焦磷酸合酶活性和前体物质GPP积累的影响，从而调控l-龙脑积累；另一方面，从植物初生代谢途径，分析外源镁对艾纳香内源激素积累的作用，从而影响初生代谢产物总糖、粗蛋白、粗脂肪、粗纤维和灰分积累，进而影响艾纳香药材产量。基于植物的次生代谢是以初生代谢产物为物质基础，通过综合分析，阐释外源镁对艾纳香中l-龙脑积累及药材产量的影响及其协同调控机制。本项目的开展不仅对提高栽培艾纳香药材产量和质量具有重要的理论价值，也为建立和完善艾纳香规范化生产技术体系奠定了较好的实验基础。

For a long time, the Blumea balsamifera cultivation with low content of l-borneol and low yield has become an important factor on limiting its industrial development. The results in our pre-research have confirmed that exogenous magnesium could significantly enhance the content of l-borneol and medicinal material yield, but its regulation mechanism is not yet clear. Therefore, B. balsamifera is cultivated by hydroponics foliage sprayed magnesium with dynamic monitor. One the one hand, base on plant secondary metabolic pathway, the effect of exogenous magnesium on the content of l-borneol, and the activity of key enzyme (bornyl diphosphate synthase) and content of precursor geranyl diphosphate (GPP) in biosynthesis of l-borneol are studied. It can define the regulation of exogenous magnesium on the accumulation of l-borneol. On the other hand, base on plant primary metabolic pathway, the effect of exogenous magnesium on the endogenous hormone is analyzed. The effect of magnesium on contents of primary metabolites (total sugar, crude protein, crude fat, crude fiber and ash) might also be verified and then explicit the influences on medicinal material yields of B. balsamifera. In addition, plant primary metabolites are the substantial bases for plant secondary metabolism. Through comprehensive analysis, the cooperative regulation mechanism of exogenous magnesium on the accumulation of l-borneol and medicinal material yield in B. balsamifera could be elucidated. In short, there is an important theoretical value to increase the quality and yield of B. balsamifera cultivation. At the same time, it will provide a favourable experimental basis to establish and improve the standardized production technology system of B. balsamifera cultivation.