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Evaluation of potato cultivars, clones and a true seed population for resistance toRhizoctonia solani

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Abstract

Field and laboratory studies were conducted in 1985–1986 to evaluate the relative severity ofRhizoctonia solani damage among 26 clones and five potato (Solanum tuberosum) cultivars. A test with true potato seeds showed that resistance toR. solani could be identified in two years. One highly resistant line was identified by this method. Moderate degrees of resistance were found in lines from the USDA Potato Breeding Program (BARC) with russet types producing a higher percentage of highly resistant lines than round whites. A laboratory test revealed that apical sprout damage (nipping) was variable within and between lines and that it was an important phase of disease development to measure when determining resistance because of its effects on the resulting plant growth and production of marketable tubers. It was also determined that to accurately define resistance toR. solani in potato, all phases of the disease must be evaluated to insure against resistance “breakdown” at some point in plant development.

Compendio

En 1985–1986, se condujeron estudios de campo y laboratorio para evaluar la severidad relativa de los daños por Rhizoctmia solani entre 26 clones y cinco cultivares de papa (Solarium tuberosum). Un examen con semillas sexuales de papa demostró que la resistencia a R. solani podía ser identificada en dos años. Una línea de alta resistencia fue identificada por este método. Se encontraron grados moderados de resistencia en líneas del Programa de Mejoramiento de Papa (BARC) del USDA. Los tipos moreno-rojizos produjeron un mayor porcentaje de líneas altamente resistentes que las blanco-redondos. Un examen de laboratorio reveló que el daño del brote apical (nipping) fue variable dentro y entre líneas y que era una fase importante del desarrollo de la enfermedad a medir al determinar la resistencia, debido a los efectos resultantes sobre el crecimiento de la planta y la producción de tubérculos comerciables. También se determinó que para definir con precisión la resistencia de la papa al R. solani, todas las fases de la enfermedad deben de ser evaluadas para asegurarse contra la “pérdida” de la resistencia en algún momento del desarrollo de la planta.

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Leach, S.S., Webb, R.E. Evaluation of potato cultivars, clones and a true seed population for resistance toRhizoctonia solani . American Potato Journal 70, 317–328 (1993). https://doi.org/10.1007/BF02851425

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