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Potato germplasm resistant to corky ringspot disease

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Abstract

Potato germplasm was assessed for resistance to corky ringspot disease (CRS) incited by transmission of tobacco rattle virus (TRV). TRV is transmitted by the stubby root nematode,Paratrichodorus allius, in the Pacific Northwest, and characterized by necrotic areas in the tuber. Four tests were conducted at two different problem fields in Umatilla, OR and Pasco, WA. The fields differed in the virulence of the virus isolates. Some clones and named varieties showed resistance only in the field with the relatively mild Umatilla isolate, while others remained symptomless at both sites. The host suitability of test potatoes to threeP. allius populations from the region was determined in greenhouse pot tests, and expressed as reproductive values [Rf = (final population of nematode at 55 days) / (initial population)]. TheR f values for the nematodes were not correlated with resistance ratings based on visual scoring of CRS symptoms in field grown potatoes. Thus, it appears that CRS resistance is based on reaction of potato genotypes to virus and not the vector. The availability of resistant clones inin vitro form is indicated.

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Authors and Affiliations

  1. USDA/AKS, 24106 N. Bunn Rd., 99350, Prosser, WA

    C. R. Brown, J. M. Crosslin & P. E. Thomas

  2. Washington State University-Irrigated Agriculture Research and Extension Center, 99350, Prosser, WA

    H. Mojtahedi & G. S. Santo

  3. Oregon State University, Hermiston Agricultural Research and Extension Center, Hermiston, Oregon

    P. Hamm

  4. USDA/ARS, Aberdeen, Idaho

    J. J. Pavek & D. Corsini

  5. University of Idaho, Agricultural Research and Extension Center, Aberdeen, Idaho

    S. Love

Authors
  1. C. R. Brown
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  2. H. Mojtahedi
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  3. G. S. Santo
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  4. P. Hamm
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  5. J. J. Pavek
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  6. D. Corsini
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  7. S. Love
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  8. J. M. Crosslin
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  9. P. E. Thomas
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Correspondence to C. R. Brown.

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Brown, C.R., Mojtahedi, H., Santo, G.S. et al. Potato germplasm resistant to corky ringspot disease. Am. J. Pot Res 77, 23–27 (2000). https://doi.org/10.1007/BF02853658

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  • DOI: https://doi.org/10.1007/BF02853658

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