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First Report of Rhizopus oryzae as a Postharvest Pathogen of Apple in Korea

Jin-Hyeuk Kwon1, Jinwoo Kim, Won-Il Kim

  • 1Gyeongsangnam-do Agricultural Research and Extension Services, Jinju 660-360, Korea.

Mycobiology
|July 12, 2012
PubMed

Insights

Soft rot, a new apple disease caused by Rhizopus oryzae, has been identified in Korea. This finding is supported by mycological, molecular, and pathogenicity data, confirming the fungus as the causal agent.

Area of Science:

  • Plant Pathology
  • Mycology
  • Molecular Biology

Background:

  • Soft rot poses a significant threat to apple production worldwide.
  • Accurate identification of fungal pathogens is crucial for effective disease management.

Purpose of the Study:

  • To report the first occurrence of soft rot in apples caused by Rhizopus oryzae in Korea.
  • To characterize the causal fungus using morphological, molecular, and pathogenicity methods.

Main Methods:

  • Fungal isolation and culturing from infected apple tissues.
  • Morphological characterization of the isolated fungus.
  • Molecular identification using internal transcribed spacer (ITS) rDNA sequencing.
  • Pathogenicity testing on healthy apple fruits.

Main Results:

  • Rhizopus oryzae was successfully isolated from soft-rotted apple samples.
  • Morphological analysis revealed characteristic features of Rhizopus oryzae.
  • ITS rDNA sequence analysis confirmed the fungal identity.
  • Pathogenicity tests demonstrated the ability of the isolate to cause soft rot in apples.

Conclusions:

  • Rhizopus oryzae is identified as the causal agent of a newly observed soft rot disease in Korean apples.
  • This study provides the first record of this specific apple rot in Korea.
  • The findings necessitate further investigation into disease management strategies for Rhizopus oryzae in apple orchards.
Keywords:
Postharvest diseaseRhizopus oryzaeSoft rot

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