The Korean Journal of Mycology (한국균학회지)

The Korean Society of Mycology (한국균학회)
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Occurrence of Root Rot caused by Fusarium fujikuroi on Adzuki Bean in Korea

  • Min Sun Ha (Crop Protection Division, National Institute of Agricultural Sciences) ;
  • Hyunjoo Ryu (Crop Protection Division, National Institute of Agricultural Sciences) ;
  • Sung Kee Hong (Crop Protection Division, National Institute of Agricultural Sciences) ;
  • Ho Jong Ju (Department of Agricultural Biology, Jeonbuk National University) ;
  • Hyo-Won Choi (Crop Protection Division, National Institute of Agricultural Sciences)
  • Received : 2022.10.31
  • Accepted : 2022.12.09
  • Published : 2022.12.31
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Abstract

In July 2020, wilting symptoms were observed among adzuki bean plants (Vigna angularis var. angularis L.) in the fields in Yeosu, Korea. Infected plants showed yellowing of leaves, browning inside the stems, splitting of stem bark, and wilting. When these plants were uprooted, their roots were found to be brown. The fungal pathogens NC20-737, NC20-738, and NC20-739 were isolated from symptomatic stem and root tissues. These pathogens were identified as a Fusarium fujikuroi species complex based on their morphological characteristics. Molecular identification was performed using the DNA sequence of translation elongation factor 1 alpha and the RNA polymerase II second largest subunit regions. The nucleotide sequences of all three isolates were similar to the F. fujikuroi reference isolates NRRL 13566 and NRRL 5538 of the National Centre for Biotechnology Information GenBank. A pathogenicity test was conducted by the soil inoculation method with cornmeal sand inoculum. Approximately 3 weeks after inoculation, symptoms were observed only in the inoculated adzuki bean seedlings. To the best of our knowledge, this is the first report of Fusarium root rot caused by F. fujikuroi in adzuki beans, both in Korea and worldwide.

Keywords

Acknowledgement

This study was supported by a grant (Project No. PJ014956) from the Rural Development Administration, Republic of Korea.

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