The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Genetic Diversity of Didymella bryoniae for RAPD Profiles Substantiated by SCAR Marker in Korea

  • Shim, Chang-Ki (Organic Farming Technology Division, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Seo, Il-Kyo (Dept. of Applied Biology & Environmental Sciences, Gyeongsang National University) ;
  • Jee, Hyeong-Jin (Organic Farming Technology Division, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Kim, Hee-Kyu (Dept. of Applied Biology & Environmental Sciences, Gyeongsang National University, Research Institute of Life Science, Gyeongsang National University)
  • Published : 2006.03.01
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Abstract

Twenty isolates of Didymella bryoniae were isolated from infected cucurbit plants in various growing areas of southern Korea in 2001 and 2002. Random Amplified Polymorphic DNA (RAPD) group [RG] I of D. bryoniae was more virulent than RG IV to watermelon. Virulence of the RG I isolate was strong to moderate to cucumber, whereas that of the RG IV varied from strong, moderate to weak. Two hundred seventy-three amplified fragments were produced with 40 primers, and were analyzed by a cluster analysis using UPGMA method with an arithmetic average program of NTSYSPC. At the distance level of 0.7, two major genomic DNA RAPD groups were differentiated among 20 isolates. The RG I included 7 isolates from watermelon and one isolate from melon, whereas the RG IV included 12 isolates from squash, cucumber, watermelon and melon. Amplification of internal transcribed spacer (ITS) region and small subunit rRNA region from the 20 isolates yielded respectively a single fragment. Restriction pattern with 12 restriction enzymes was identical for all isolates tested, suggesting that variation in the ITS and small subunit within the D. bryoniae were low. Amplification of the genomic DNAs of the tested isolates with the sequence characterized amplified regions (SCAR) primer RG IF-RG IR specific for RG I group resulted in a single band of 650bp fragment for 8 isolates out of the 20 isolates. Therefore, these 8 isolates could be assigned into RG I. The same experiments done with RG IIF-RG IIR resulted in no amplified PCR product for the 20 isolates tested. An about 1.4 kb-fragment amplified from the RG IV isolates was specifically hybridized with PCR fragments amplified from genomic DNAs of the RG IV isolates only, suggesting that this PCR product could be used for discriminating the RG IV isolates from the RG I isolates as well other fungal species.

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References

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