Abstract
Twenty potato breeding selections and five potato cultivars (25 clones) were evaluated in replicated field plots for their resistance to common scab caused byStreptomyces scabies, at Presque Isle, ME and Cranesville, WV in 1993. At harvest, all tubers in each plot were individually scored for the surface area covered (0=0% to 5>75%) and for lesion type (0=no lesions to 5=pitted lesions). The individual tuber scores for either surface area covered or lesion type for each plot were totaled and divided by five times the number of tubers to create an index of surface area covered (SAI) or lesion type (LI), respectively. Clonal mean SAI ranged from 0.05 to 0.96 in Maine and 0.21 to 0.89 in West Virginia. Clonal mean LI ranged from 0.06 to 1.0 in Maine and 0.48 to 1.0 in West Virginia. There were significant differences among clones for SAI and LI. Clones were clustered on mean SAI and LI in ME and WV. The clones clustered into four groups. The resistance of Krantz and two breeding selections, B0348-2 and B0339-1, was similar to Ontario.
Compendio
Veinte selecciones de mejoramiento de papa y cinco cultivares (25 clones) fueron evaluados, en 1993, en parcelas de campo con repeticiones, para su resistencia a la sarna común causada por Streptomyces scabies, en Presque Isle, ME y Cranesville, WV. Al momento de la cosecha, todos los tubérculos en cada parcela fueron calificados individualmente por el área de superficie cubierta (0=0 % a 5>75 %) y por el tipo de lesión (0=sin lesiones a 5=lesiones profundas). Las calificaciones individuates por tubérculo, tanto por área de superficie cubierta como por el tipo de lesiones, para cada parcela, fue totalizada y dividida por cinco veces el número de tubérculos, para crear un indice de área de superficie cubierta (SAI) o de tipo de lesión (LI), respectivamente. El promedio clonal del SAI varió de 0.05 a 0.96 en Maine, y de 0.21 a 0.89 en West Virginia. El promedio clonal del LI varió de 0.06 a 1.0 en Maine, y de 0.48 a 1.0 en West Virginia. Hubo diferencias significativas entre los clones, para SAI y LI. Los clones fueron agrupados de acuerdo al promedio de SAI y LI en ME y WV. Los clones se agruparon en cuatro grupos. La resistencia de Krantz y dos selecciones de mejoramiento, B0348-2 y B0339-1, fue similar a la de Ontario.
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Goth, R.W., Haynes, K.G., Young, R.J. et al. Relative resistance of the potato cultivar krantz to common scab caused byStreptomyces scabies as determined by cluster analysis. American Potato Journal 72, 505–511 (1995). https://doi.org/10.1007/BF02849252
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DOI: https://doi.org/10.1007/BF02849252