罹病西洋参根内主要人参皂苷含量的变化

目的：研究根部病害对西洋参根不同部位主要皂苷含量的影响。方法：采集田间同一栽培地发生不同程度根腐病的西洋参根，采用HPLC测定不同发病程度根韧皮部、木质部中人参皂苷Rg1，Re，Rb1的含量；结果：不同程度罹病西洋参根韧皮部及木质部中Rg1含量均无显著变化；发病严重的根韧皮部Re含量显著降低(P<0.05)，而木质部含量显著升高(P<0.05)；Rb1在中度及重度发病西洋参根韧皮部及木质部中含量均显著降低(P<0.05)。结论：不同严重程度的西洋参病根中Rg1，Re，Rb1呈现复杂的变化，导致Rg1，Re，Rb1在总皂苷中的比例发生变化。

Variation of ginsenosides in infected roots of American ginseng (Panax quinquefolium)

To study the infected root of Panax quinquefolium on the contents of ginsenosides. Method: The contents of three major ginsenosides Rg1, Re and Rb1 were determined by HPLC compared quantitatively between the different degree infected roots and normal root in the phloem and xylem. Result: Rg1 in phloem and xylem of varying degrees infected root showed no significant difference, but Rb1 decreased 26.3% and 28.3% respectively in medium and serious infected roots comparing to normal root. Re in phloem of seriously infected roots decreased in xylem significantly. Conclusion: The results indicate that the variation of ginsenosides in different degrees infected roots exists and the proportion of Rg1, Re and Rb1 in the total ginsenosides changes.