Journal of Ginseng Research

The Korean Society of Ginseng (고려인삼학회)
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Discovery of a new primer set for detection and quantification of Ilyonectria mors-panacis in soils for ginseng cultivation

  • Farh, Mohamed El-Agamy (Graduate School of Biotechnology and Ginseng Bank, College of Life Science, Kyung Hee University) ;
  • Han, Jeong A. (Gyeonggi-do Agricultural Research & Extension Services) ;
  • Kim, Yeon-Ju (Graduate School of Biotechnology and Ginseng Bank, College of Life Science, Kyung Hee University) ;
  • Kim, Jae Chun (Department of Oriental Medicinal Biotechnology, College of Life Sciences, Kyung Hee University) ;
  • Singh, Priyanka (Department of Oriental Medicinal Biotechnology, College of Life Sciences, Kyung Hee University) ;
  • Yang, Deok-Chun (Graduate School of Biotechnology and Ginseng Bank, College of Life Science, Kyung Hee University)
  • Received : 2016.10.14
  • Accepted : 2017.07.20
  • Published : 2019.01.15
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Abstract

Background: Korean ginseng is an important cash crop in Asian countries. However, plant yield is reduced by pathogens. Among the Ilyonectria radicicola-species complex, I. mors-panacis is responsible for root-rot and replant failure of ginseng in Asia. The development of new methods to reveal the existence of the pathogen before cultivation is started is essential. Therefore, a quantitative real-time polymerase chain reaction method was developed to detect and quantify the pathogen in ginseng soils. Methods: In this study, a species-specific histone H3 primer set was developed for the quantification of I. mors-panacis. The primer set was used on DNA from other microbes to evaluate its sensitivity and selectivity for I. mors-panacis DNA. Sterilized soil samples artificially infected with the pathogen at different concentrations were used to evaluate the ability of the primer set to detect the pathogen population in the soil DNA. Finally, the pathogen was quantified in many natural soil samples. Results: The designed primer set was found to be sensitive and selective for I. mors-panacis DNA. In artificially infected sterilized soil samples, using quantitative real-time polymerase chain reaction the estimated amount of template was positively correlated with the pathogen concentration in soil samples ($R^2=0.95$), disease severity index ($R^2=0.99$), and colony-forming units ($R^2=0.87$). In natural soils, the pathogen was recorded in most fields producing bad yields at a range of $5.82{\pm}2.35pg/g$ to $892.34{\pm}103.70pg/g$ of soil. Conclusion: According to these results, the proposed primer set is applicable for estimating soil quality before ginseng cultivation. This will contribute to disease management and crop protection in the future.

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References

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