Abstract
Tubers from open pollinated progenies of 15 cultivars ofS. tuberosum ssp.andigena were evaluated separately for their reactions toFusarium andErwinia. The materials inoculated withF. oxysporum (Fo) showed a range of 8 to 29% (mean= 18.6%) of genotypes with no rotting symptoms. In inoculations withF. solani(Fs), the range was from 6 to 41% (mean=24.3%). High levels of resistance toE. chrysanthemi (Ech) soft rot were observed in 7 out of the 15 progenies evaluated. A range from 5 to 19% (mean=10.1%) of genotypes with cylindrical rot of less than 1.9 mm was observed. A total of 115 out of 512 genotypes combined resistances to both Fo and Fs. Moreover, 59 genotypes that combine resistance toErwinia andFusarium were also identified. Seven of these were resistant to Fo and Ech, 25 to Fs and Ech, and more important, there were 27 genotypes resistant to Fo, Fs, and Ech.
Compendio
Tubérculos de progenies de polinización libre de 15 cultivares deS. tuberosum ssp.andigena fueron evaluados separadamente por sus reacciones aFusarium yErwinia. Los materiales inoculados conF. oxysporum (Fo) mostraron un rango de 8 a 29% (promedio= 18.6%) de genotipos sin síntomas de pudrición. En inoculaciones conF. solani (Fs), el rango fue de 6% a 41% (promedio=24.3%). Altos niveles de resistencia a la pudrición blanda ocasionada porE. chrysanthemi (Ech) fueron encontrados en 7 de las 15 progenies evaluadas. Se observo un rango desde 5 a 19% (promedio=10.1%) de genotipos con una pudricion cilíndrica de menos de 1.9 mm. Un total de 115 genotipos de los 512 evaluados combinaron resistencia a Foy Fs. Además, se identificaron 59 genotipos que combinan resistencia aErwinia yFusarium. De éstos, 7 fueron resistentes a Fo y Ech, 25 a Fs y Ech, y lo más importante, 27 genotipos fueron resistentes a Fo, Fs y Ech.
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Huaman, Z., Tivoli, B. & de Lindo, L. Screening for resistance toFusarium dry rot in progenies of cultivars ofS. tuberosum ssp.andigena with resistance toErwinia chrysanthemi . American Potato Journal 66, 357–364 (1989). https://doi.org/10.1007/BF02853432
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DOI: https://doi.org/10.1007/BF02853432