土壤类型对短葶飞蓬灯盏乙素和咖啡酸酯积累的影响

在相同栽培管理条件下，分别以黑色石灰土、红色石灰土、红壤、黄红壤、紫色土和腐殖土为生长介质对短葶飞蓬（Erigeron breviscapus）进行了人工栽培试验。结果显示，生长在不同土壤类型的短葶飞蓬植株体内总咖啡酸酯和灯盏乙素含量有显著的差异。红色石灰土、紫色土及黄红壤生长的植株总咖啡酸酯和灯盏乙素含量最高，黑色石灰土和腐殖土的最低。相同土类的不同亚类土壤生长植株间2种次生代谢产物含量的差异程度，会超过不同土类间的。植株总咖啡酸酯和灯盏乙素含量与土壤P和K含量没有显著相关关系，但与土壤速效N含量及植株含N量则都有极显著负相关关系。不同土壤生长植株叶片的最大光能转换效率（Fv／Fm）值与灯盏乙素和总咖啡酸酯含量都表现出极显著负相关关系。土壤类型对短葶飞蓬次生代谢影响规律与碳素／营养平衡假说（CNB）及资源获得假说（HA）的预测一致。

Effects of Soil Types on Contents of Scutellarin and Caffeates in Erigeron breviscaps

Erigeron breviscapus were planted in rendzina, terra rossa, orthic red earth, yellow red earth, purplish soil and humic soil to investigate effects of soil types on accumulation of total caffeates and scutellarin. Results showed significant differences existed in total caffeates and scutellarin among the various tested soil types, and the total caffeates or scutellarin content was the highest in plants growing in terra rossa, yellow red earth and purplish soil, and the lowest in rendzina and humic soil. The difference in the content of total caffeates or scutellarin between soil subgroups was larger than that between soil groups in the Chinese Soil Taxonomy. Content of total caffeates and scutellarin of E. breviscaps was not significantly related to contents of P or K, but was negatively correlated with the content of total and available N in the soil. Fv/Fm of leaves was significantly negatively related to the content of total caffeates and scutellarin. The variation of the content of the secondary metabolites in plants grown in different type of soil was consistent with both the carbon-nutrient balance hypothesis and the resource availability hypothesis.