Abstract
Various potato cultivars were grown in field plots from seed pieces inoculated withCoryneacterium sepedanicum by vacuum infiltration. Foliage symptoms were recorded during the growing season and tuber symptoms at harvest. Cultivars were ranked according to the frequency with which the progeny tubers expressed external bacterial ring rot symptoms. Those that yielded 50–100% symptomatic tubers were placed in symptom expression class (SEC) 1; those that produced 25–49%, 10–24%, and ≤9% symptomatic tubers were placed, respectively, in SEC 2,3, and 4. The incidence of latent ring rot infections in stems and tubers were similar among cultivars in the different SEC classes. Bacterial population densities, quantified by immunofluorescence, were as high as 1010 cells/g in stems from cultivars of all SEC classes. Mean populations in tubers ranged from 106 – 107 cells/g and did not differ significantly among cultivars.
Compendio
Se sembraron en parcelas en el campo varios cultivares de papa utilizando segmentos de tubérculos-semillas inoculados por infiltración al vacío conCorynebacterium sepedonicum. Se registraron los síntomas foliares durante la temporada de cultivo y los síntomas en los tubérculos al momento de la cosecha. Los cultivares fueron clasificados de acuerdo a la frecuencia con la cual los tubérculos progenie expresaban síntomas externos de la purdrición anular bacteriana. Aquellos que rindieron 50–100% de tubérculos con síntomas fueron colocados en la clase de expresión de síntomas (CES) 1; los que produjeron 25–49%, 10–24%, y 9% de tubérculos con síntomas fueron colocados en CES 2, 3 y 4, respectivamente. La incidencia de infecciones latentes de pudrición anular en tallos y tubérculos fue similar entre las diferentes clases de CES de los cultivares. Las densidades de las poblaciones bacterianas, cuantificadas por inmunofluorescencia, fueron tan altas como 1010 células/g en tallos de cultivares de todas las clases CES. Las poblaciones medias en los tubérculos variaron de 106 a 107 células/g y no difirieron significativamente entre los cultivares.
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De Boer, S.H., McCann, M. Detection ofCorynebacterium sepedonicum in potato cultivars with different propensities to express ring rot symptoms. Am. J. Pot Res 67, 685–694 (1990). https://doi.org/10.1007/BF03044015
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DOI: https://doi.org/10.1007/BF03044015