NDLI: Characterization of Resistance to Corky Ringspot Disease in Potato: A Case for Resistance to Infection by Tobacco Rattle Virus

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Characterization of Resistance to Corky Ringspot Disease in Potato: A Case for Resistance to Infection by Tobacco Rattle Virus

Content Provider	Springer Nature Link
Author	Brown, C. R. Mojtahedi, H. Crosslin, J. M. James, S. Charlton, B. vy, R. G. Love, S. L. Vales, M. I. Hamm, P.
Copyright Year	2008
Abstract	Corky ringspot disease (spraing) is incited by the tobacco rattle virus (TRV) transmitted by stubby root nematode (Paratrichodorus spp.). The resulting damage consists of internal and skin surface necrotic blemishes which render the tubers unmarketable. Resistance to the disease has been extensively documented in breeding programs. High levels of resistance are known for a number of varieties and breeding lines. Because tubers that are symptomless but virus infected have been documented, the nature of resistance is a point of debate. In two field locations where a total of 1,259 tubers of resistant breeding lines were RT-PCR tested, 5.6 and 2.0% of symptomless tubers gave positive PCR tests in the different fields. Nearly all of these were from three clones that would have been classified as susceptible by symptoms in later testing. Taken as a whole 58% of the symptomatic tubers gave positive PCR tests. Standard commercial susceptible cultivars showed 34% symptomless tubers with positive PCR results. We have shown here that tubers of most resistant lines are not positive for the virus when asymptomatic tubers are tested by RT-PCR, while symptomatic tubers are mostly positive. Within selected resistant materials, clones with the highest level of asymptomatic positives also showed susceptible responses as assessed by visual ranking in later tests. Although RT-PCR fails to amplify from symptomatic tubers in some cases, the results of this study suggest that most resistant breeding lines do not test positive as latent carriers of the virus. Therefore, lack of symptoms appears to be an expression of resistance to infection by TRV.La mancha de anillo corchoso (torsión) en papa es causada por el virus del tobacco rattle (TRV) y trasmitido por el nematodo de la raíz gruesa (Paratrichodorus spp.). El daño consiste en manchas necróticas internas y superficiales de la piel, las cuales convierten a los tubérculos en no comerciables. La resistencia a la enfermedad ha sido extensamente documentada en los programas de mejoramiento. Se conocen altos niveles de resistencia para algunas variedades y líneas de mejoramiento. Debido a que tubérculos infectados que carecen de síntomas han sido documentados, la naturaleza de la resistencia es un punto en debate. En campos de dos localidades donde un total de 1,259 tubérculos de líneas resistentes de mejoramiento fueron probados por RT-PCR, 5.6% y 2% de los tubérculos sin síntomas dieron positivo en los campos diferentes. Casi todos ellos provinieron de tres clones que podían haber sido clasificados susceptibles en la prueba posterior. Tomando como un todo el 58% de tubérculos sintomáticos dieron positivo en las pruebas PCR. El 34% de tubérculos comerciales comunes de cultivares susceptibles no mostraron síntomas a pesar de los resultados positivos con PCR. Hemos demostrado que los tubérculos de líneas más resistentes no dan positivo para el virus cuando los tubérculos asintomáticos son probados por RT-PCR, mientras que los sintomáticos son en su mayoría positivos. Dentro de los materiales resistentes seleccionados, los clones con niveles altos de positivos asintomáticos también mostraron respuesta positiva cuando se evaluaron por medios visuales en las pruebas posteriores. Aunque la prueba RRT-PCR no logra amplificar en algunos casos los tubérculos sintomáticos, los resultados de este estudio sugieren que las líneas de mejoramiento más resistentes no dan positivo como portadores latentes del virus. Por lo tanto, la falta de síntomas parece ser una expresión de resistencia a la infección del TRV.
Starting Page	49
Ending Page	55
Page Count	7
File Format	PDF
ISSN	1099209X
Journal	American Potato Journal
Volume Number	86
Issue Number	1
e-ISSN	18749380
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-01-01
Publisher Institution	Potato Association of America
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Breeding Virus resistance Spraing Latent infection Stubby root nematode Paratrichodorus Solanum Germplasm Plant Pathology Plant Breeding/Biotechnology Plant Genetics & Genomics Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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