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Influence of cultivar resistance toVerticillium SPP. On potato early dying

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Abstract

Microplot studies were conducted over 3 yr to examine the influence ofVerticillium dahliae (VD) andPratylenchus penetrans (PP) on theVerticillium-susceptible cultivars, Kennebec and Superior, and the resistant cultivars, Reddale and Russette.V. dahliae alone negatively affected yield in 2 of the 3 yr for Kennebec and Superior, but showed no effect on yield in Russette and Reddale in any year. An interaction betweenV. dahliae andP. penetrans resulted in higher yield losses in 1 of the 3 yr for Kennebec, Reddale and Russette. Regression equations were developed for each cultivar from data averaged over 3 yr which indicated that, on average, the product of VD and PP density terms can be used to describe yield losses inVerticillium resistant cultivars. With the susceptible cultivars, a quadratic function with VD and either the VD x PP interaction or PP alone was the best descriptor of average yield losses.

Incidence of senescence (a measure of potato early dying [PED] ) was related to densities ofV. dahliae andP. penetrans by fitting quadratic regression models with the terms: time (T), VD, PP, T2, VD x T, VD2, PP x T, VD x PP, and PP2. By finding which terms were significant and comparing parameter estimates for these terms among cultivars, information was gained on both the effect ofV. dahliae andP. penetrans on PED incidence and the rate of increase of PED incidence over time. A VD x PP interaction for Kennebec and Russette in 1989 and Kennebec in 1991 was associated with earlier, high incidence of PED symptoms. The synergistic action ofV. dahliae andP. penetrans could cause proportionally higher yield losses, although much higher yield losses were associated with the susceptible cultivars. Susceptible cultivars generally had higher senescence incidence and a higher rate of senescence increase, early in the season, compared to resistant cultivars.

Compendio

Se condujeron durante tres años estudios en microparcelas para examinar la influencia deVerticillium dahliae (VD) yPratylenchus penetrans (PP) sobre los cultivares susceptibles aVerticillium, Kennebec y Superior, y los cultivares resistentes, Reddale y Russette.V. dahliae, solo, afectó negativamente los rendimientos de Kennebec y Superior en dos de los tres años, pero no mostró ningún efecto sobre los rendimientos de Russette y Reddale en ningún año. Una interacción entreV. dahliae yP. penetrans dio por resultado mayores pérdidas en los rendimientos de Kennebec, Reddale y Russette en uno de los tres años. Se desarrollaron ecuaciones de regresión para cada cultivar con los datos obtenidos en los tres años, los mismos que indicaron, en promedio, que el producto de los términos de densidad de VD y PP puede ser utilizado para describir las pérdidas en rendimiento en los cultivares resistentes alV. dahliae. Con los cultivares susceptibles, una función cuadrática con VD y la interacción VD x PP o PP solo, fue el mejor descritor de las pérdidas promedio en rendimiento.

La incidencia de la senescencia (una medida de la muerte prematura de la papa [PED] ) estuvo relacionada con las densidades deV. dahliae yP. penetrans ajustando los modelos de regresión cuadrática con los términos: tiempo (T), VD, PP, T2, VD x T, VD2, PP x T, VD x PP, y PP2. Encontrando qué términos eran significativos y comparando los estimados de los parámetras para esos términos entre los cultivares, se obtuvo información tanto del efecto deV. dahliae yP. penetrans sobre la incidencia de la PED y la tasa de incremento, con el tiempo, de la incidencia de la PED. Una interacción VD x PP para Kennebec y Russette en 1989 y para Kennebec en 1991, estuvo asociada con una alta incidencia de síntomas de PED. La acción sinergística deV. dahliae yP. penetrans podría causar proporcionalmente mayores pérdidas en rendimiento, no obstante que las mayores pérdidas en rendimiento estuvieron asociadas con los cultivares susceptibles. En comparación con los cultivares resistentes los cultivares susceptibles tienen generalmente una mayor incidencia de la senescencia y una tasa más alta de incremento de la misma a comienzos de la temporada.

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Wheeler, T.A., Rowe, R.C., Riedel, R.M. et al. Influence of cultivar resistance toVerticillium SPP. On potato early dying. American Potato Journal 71, 39–57 (1994). https://doi.org/10.1007/BF02848744

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