Effects of Fusarium solani and F. oxysporum Infection on the Metabolism of Ginsenosides in American Ginseng RootsReport as inadecuate




Effects of Fusarium solani and F. oxysporum Infection on the Metabolism of Ginsenosides in American Ginseng Roots - Download this document for free, or read online. Document in PDF available to download.

1

Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, China

2

School of Food and Agriculture, University of Maine, Orono, ME 04469, USA



These authors contributed equally to this work.





*

Author to whom correspondence should be addressed.



Academic Editor: Derek J. McPhee

Abstract American ginseng Panax quinquefolius L. is a highly valuable herb widely used for medicinal treatments. Its pharmacologically important compounds are the ginsenosides, which are secondary metabolites in American ginseng root. The concentrations of ginsenoside in roots can be changed by fungal infection, but it is unclear what specific root tissues are impacted and whether the change is systemic. In this study, American ginseng roots were inoculated with two fungal pathogens Fusarium solani or F. oxysporum and the levels of six ginsenosides Rb1, Rb2, Rc, Rd, Re, and Rg1 were then measured in the phloem and xylem around the discolored lesions and adjacent healthy areas of the root. Results indicated that the growth of Fusarium spp. was strictly limited to phloem, and correspondingly the ginsenoside concentration was only altered in this infected phloem. The concentration of Rg1, Rd, and Rc significantly changed in phloem tissues where F. solani was inoculated, while only Rg1 and Rd changed significantly after F. oxysporum inoculation. However, no changes of any ginsenoside occurred in either xylem or phloem tissue adjacent to the inoculation point. In addition, when two Fusarium spp. were grown on ginsenoside-amended Czapek medium, the majority of ginsenosides were depleted. Therefore, pathogenic Fusarium spp. may reduce ginsenoside levels by consuming them. View Full-Text

Keywords: Panax quinquefolius; root pathogen; chemical response; biodegradation Panax quinquefolius; root pathogen; chemical response; biodegradation





Author: Xiaolin Jiao 1,†, Xiaohong Lu 1,†, Amanda Juan Chen 1, Yi Luo 1, Jianjun J. Hao 2 and Weiwei Gao 1,*

Source: http://mdpi.com/



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