Impact and Mechanism of Ginseng Rusty Root Symptoms on Ginsenoside Content
Objective:To reveal the effect and the mechanism of ginseng rusty root symptoms on ginseng quality.Methods:Ginseng samples with rusty root symptoms at different stages were collected in June and August.Phloem tissue of healthy ginseng(AG),tissue without discoloration around red-patches of ginseng with the symptoms(BG),and red-patch tissue of ginseng with the symptoms(CG)were selected as samples to determine reactive oxygen species(ROS)and malondialdehyde(MDA)content,antioxidant enzyme activities,as well as secondary metabolism-related enzyme activities.The content of ginsenoside Rg1,ginsenoside Re,ginsenoside Rf,ginsenoside Rb1,ginsenoside Rc,ginsenoside Ro and ginsenoside Rb2 in healthy ginseng and ginseng with the symptoms were analyzed.Result:The same change trend was found in the test results of the ginseng samples in different months.Compared with the AG group,ROS content,antioxidant enzyme activities,and secondary metabolize-related enzyme activities in the BG group reached the highest,and MDA content in the CG group reached the highest.Compared with ginsenosides content of healthy ginseng,ginsenosides content significantly increased in the early stage of ginseng with the symptoms in June and significantly decreased in the late stage in August.Conclusion:Ginseng rusty root symptoms could affect ginseng quality,with higher saponin levels in the early stages or under relatively mild stress,and lower under severe stress or the in late stage of the symptoms.
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