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Occurrence of Soft Rot on Raspberry (Rubus crataegifolius) Caused by Rhizopus oryzae in Korea

Rhizopus oryzae에 의한 산딸기 무름병

  • Kwon, Jin-Hyeuk (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Kang, Dong-Wan (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • An, Jae-Uk (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Choi, Ok-Hee (Department of Applied Biology, Gyeongsang National University) ;
  • Kwak, Youn-Sig (Department of Applied Biology, Gyeongsang National University)
  • Received : 2011.07.14
  • Accepted : 2011.11.12
  • Published : 2011.12.31

Abstract

Soft rot disease on Raspberry (Rubus crataegifolius Bunge) was observed in sale boxes at Jinju City Wholesale Market of Agricultural Products in June 2010. The infected fruits were rapidly water-soaked, softened, black and eventually rotted. The colonies on the infected fruits were white to light brown, formed numerous sporangiospores. Optimum temperature for the mycelial growth of the causal fungus on PDA was $30^{\circ}C$ and growth was still apparent at $37^{\circ}C$. Sporangia were globose, white at early and gradually to black, and 40-210 ${\mu}m$ in diameter. Sporangiophores were white to mid brown as maturation and 8-20 ${\mu}m$ in diameter. Columella were globose to sub-globose, and the size of the diameter was 85-120 ${\mu}m$ in diameter. Sporangiospores were sub-globose, rhomboidal and irregular, streaked and 5-10 ${\mu}m$ in length. On the basis of symptom, mycological characteristics, ITS rDNA sequence analysis, and pathogenicity of the fungus, the causal fungus was clearly identified as Rhizopus oryzae Went & Prinsen Geerligs. This is the first report of soft rot by R. oryzae on R. crataegifolius in Korea.

2010년 6월 중순 경남 진주시 농산물도매시장에 유통 판매중인 산딸기에서 이상증상이 발생하였다. 병징은 과실표면에 상처 또는 물러진 과실부분이 수침 상으로 물러지면서 빠르게 부패되었다. 균총은 처음 흰색에서 연한회색으로 되고 검은색의 포자낭을 많이 형성하였으며 균사생육 적온은 $30^{\circ}C$이었으며 $37^{\circ}C$에서도 성장하였다. 포자낭은 검은색으로 구형이며 크기는 40-210 ${\mu}m$이었다. 포자낭경은 처음 흰색에서 연한 갈색을 나타내며 폭은 8-20 ${\mu}m$이었다. 주축은 구형 또는 반구형이며 크기는 85-120 ${\mu}m$이었다. 포자낭 포자는 담갈색으로 단포이며 구형 또는 장방형이고 불규칙한 것도 있으며 크기는 5-10 ${\mu}m$ 이었다. 따라서 산딸기 과실에 발생한 병징과 병원균의 균학적 특징, ITS 염기서열 분석, 그리고 병원성을 검정한 결과, 본 병을 Rhizopus oryzae Went & Prinsen Geerlings 에 의한 산딸기 무름병으로 명명할 것을 제안한다.

Keywords

References

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