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The Pear Black Necrotic Leaf Spot Disease Virus Transmitted by Talaromyces flavus Displays Pathogenicity Similar to Apple stem grooving virus Strains

  • Shim Hye-Kyung (Department of Genetic Engineering, Sungkyunkwan University) ;
  • Hwang Kyu-Hyon (Department of Genetic Engineering, Sungkyunkwan University) ;
  • Shim Chang-Ki (Organic Farming Technology Division, National Institute of Agricultural Science and Technology, Rural Development Administration (RDA)) ;
  • Son Su-Wan (Department of Genetic Engineering, Sungkyunkwan University) ;
  • Kim Dong-Giun (Environmental Biotechnology National Core Research Center and Division of Applied Life Science, Gyeongsang National University) ;
  • Choi Yong-Mun (Pear Experiment Station, National Horticultural Research Institute, RDA) ;
  • Chung Young-Jae (Department of Biology, Seonam University) ;
  • Kim Dae-Hyun (Evaluation Coordination Officer, Planning and Management Officer, RDA) ;
  • Jee Hyeong-Jin (Organic Fanning Technology Division, National Institute of Agricultural Science and Technology, Rural Development Administration (RDA)) ;
  • Lee Suk-Chan (Department of Genetic Engineering, Sungkyunkwan University)
  • Published : 2006.09.01

Abstract

The pathogenicity to pear trees and other experimental hosts of the Apple stem grooving virus Korean isolate (ASGV-K) carried by a fungal vector, Talaromyces flavus was examined. ASGV-harboring T. flavus induced mild symptoms on virus-free pears. Symptom severity was intermediate between pears showing typical PBNLS and virus-free pears. Ten cultivars of Phaseolus vulgaris showed 35%-90% infectivity by direct infiltration into leaves and roots by ASGV-harboring T. flavus. Application of fungal cultures to soils showed 0%-70% infectivity depending on the P. vulgaris cultivar. Sap extracted from ASGV-infected Chenopodium quinoa induced similar symptoms on P. vulgaris at 25 days after inoculation. Similar symptoms were also detected on P. vulgaris which were inoculated with ASGV-harboring T.flavus. When healthy P. vulgaris leaves were challenged with sap extracted from P. vulgaris leaves infected with ASGV-harboring T. flavus, typical symptoms were observed. These data suggest that T. flavus mediates the transfer of ASGV to host plants.

Keywords

References

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