The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Evaluation of Watermelon Germplasm for Resistance to Phytophthora Blight Caused by Phytophthora capsici

  • Kim, Min-Jeong (Organic Agriculture Division, National Academy of Agricultural Science) ;
  • Shim, Chang-Ki (Organic Agriculture Division, National Academy of Agricultural Science) ;
  • Kim, Yong-Ki (Organic Agriculture Division, National Academy of Agricultural Science) ;
  • Jee, Hyeong-Jin (Organic Agriculture Division, National Academy of Agricultural Science) ;
  • Hong, Sung-Jun (Organic Agriculture Division, National Academy of Agricultural Science) ;
  • Park, Jong-Ho (Organic Agriculture Division, National Academy of Agricultural Science) ;
  • Han, Eun-Jung (Organic Agriculture Division, National Academy of Agricultural Science)
  • Received : 2012.03.19
  • Accepted : 2012.11.25
  • Published : 2013.03.01
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Abstract

This study was conducted to determine the Phytophthora rot resistance of 514 accessions of watermelon germplasm, Citrullus lanatus var lanatus. About 46% of the 514 accessions tested were collections from Uzbekistan, Turkey, China, U.S.A., and Ukraine. Phytophthora capsici was inoculated to 45-day-old watermelon seedlings by drenching with 5 ml of sporangial suspension ($10^6$ sporangia/ml). At 7 days after inoculation, 21 accessions showed no disease symptoms while 291 accessions of susceptible watermelon germplasm showed more than 60.1% disease severity. A total of 510 accessions of watermelon germplasm showed significant disease symptoms and were rated as susceptible to highly susceptible 35 days after inoculation. The highly susceptible watermelon germplasm exhibited white fungal hyphae on the lesion or damping off with water-soaked and browning symptoms. One accession (IT032840) showed moderate resistance and two accessions (IT185446 and IT187904) were resistant to P. capsici. Results suggest that these two resistant germplasm can be used as a rootstock and as a source of resistance in breeding resistant watermelon varieties against Phytophthora.

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References

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