The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Different Structural Modifications Associated with Development of Ginseng Root Rot Caused by Cylindrocarpon destructans

  • Kim, Jeong-Ho (Department of Agricultural Biotechnology, Seoul National University) ;
  • Kim, Sang-Gyu (Department of Agricultural Biotechnology, Seoul National University) ;
  • Kim, Mi-Sook (Department of Agricultural Biotechnology, Seoul National University) ;
  • Jeon, Yong-Ho (Department of Agricultural Biotechnology, Seoul National University) ;
  • Cho, Dae-Hui (KT&G Central Research Institute) ;
  • Kim, Young-Ho (Department of Agricultural Biotechnology, Seoul National University)
  • Published : 2009.03.31
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Abstract

Root rot caused by Cylindrocarpon destructans is one of the most important diseases of ginseng (Panax ginseng C. A. Meyer). Two types of symptoms found in ginseng root rot are black root rot and rusty root (rusty spots), in which disease severities are high and low, respectively. Symptom development and related histopathological changes were examined in an inoculation test on 2-year-old ginseng roots using virulent (Cy9801) and avirulent (Cy0001) isolates of C. destructans under different temperature conditions (13, 18, 23, and $28^{\circ}C$). Black root rot was only induced by Cy9801 in the lower temperature range (13, 18, and $23^{\circ}C$) and not at the higher temperature ($28^{\circ}C$). No black root rot, but only rusty spot symptoms, were induced by Cy0001 at all temperatures tested except $13^{\circ}C$, at which no symptoms occurred on over half of inoculation sites, suggesting disease development was influenced by pathogen virulence and temperature. Wound periderms were formed in all root tissues with rust spot symptoms at $28^{\circ}C$ caused by Cy9801 and at 18, 23, and $28^{\circ}C$ temperatures caused by Cy0001. No wound periderm was formed at $13^{\circ}C$ by either Cy9801 or Cy0001. Light microscopy revealed that the wound periderm was formed by initial cell divisions in cell wall formation and/or additional cell wall layering in parenchyma cells without obvious nuclear division, followed by layering of the divided cells adjacent to the inoculation sites, blocking the spread of the rot. These results suggest that disease development declined at lower temperatures and by the formation of a wound periderm at higher temperatures, and that ginseng rusty root may develop under conditions unfavorable for further disease development of C. destructans.

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