Abstract
Plant mixtures have been proposed for pesticidal transgenic potatoes as a means to reduce selection intensity favoring resistant insect genotypes. Colorado potato beetle,Leptinotarsa decemlineata (Say), defoliation was simulated in mixed plantings of susceptible and resistant potato “mimics” to evaluate yield compensation. Various mixtures of susceptible and resistant potato were planted at two densities and two locations in eastern North Carolina. Resistant plants were undamaged throughout the season whereas susceptible plants were completely defoliated by hand either during early or late bloom. The ability of non-defoliated plants to compensate for neighboring defoliated plants was investigated through single-plant and smallplot field experiments for 2 years.
Yield compensation for defoliated plants by neighboring non-defoliated plants was not evident in our studies. Yield of two potato plants, positioned on either side of a defoliated plant, was not different from yield of two potato plants positioned on either side of a non-defoliated potato plant. Compensation in mixtures of resistant and susceptible potato was not evident using several non-linear regression analyses. A negative linear relationship existed between yield and an increasing percent of susceptible plants in the mixture for all planting densities, at each location, every year.
Compendio
Las mezclas de plantas han sido propuestas para papas transgénicas a los pesticidas como una manera de reducir la intensidad de selección que favorece a los genotipos resistentes de insectos. Se simuló la defoliación causada por el escarabajo de la papa de Colorado,Leptinotarsa decemlineata (Say), en siembras mixtas que “imitan” plantas de papas susceptibles y resistentes, para evaluar la compensatión en rendimientos. Se sembraron varias mezclas de papas susceptibles y resistentes a dos densidades y en dos localidades del este de Carolina del Norte. Las plantas resistentes permanecieron sin daños durante toda la temporada mientras que las susceptibles fueron totalmente defoliadas a mano al comienzo o al final de la floración. Se investigó por dos años la capacidad de las plantas no defoliadas, para compensar la defoliación de las plantas vecinas mediante experimentos con plantas individuales y en pequeñas parcelas en el campo.
La compensación en rendimiento-para las plantas defoliadas-por las plantas vecinas no defoliadas, no se hizo evidente en los estudios. El rendimiento de dos plantas de papa, localizadas a ambos lados de una planta defoliada, no se diferenció del rendimiento de dos plantas de papa localizadas a ambos lados de una planta de papa no defoliada. La compensación en mezclas de papas resistentes y susceptibles no se hizo evidente al utilizar varios análisis de regresión no linear. Se presentó una relación linear negativa entre el rendimiento y un creciente porcentaje de plantas susceptibles de la mezcla, para todas las densidades de siembra, en cada localidad y año.
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Nault, B.A., Follett, P.A., Gould, F. et al. Assessing compensation for insect damage in mixed plantings of resistant and susceptible potatoes. American Potato Journal 72, 157–176 (1995). https://doi.org/10.1007/BF02849351
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DOI: https://doi.org/10.1007/BF02849351