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Performance of populations derived by selecting for resistance to potato leafhopper in A 4XSolanum Tuberosum X 2XSolanum Chacoense cross

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Abstract

Intercross and backcross populations derived from aSolanum tuberosum L. (2n = 2x = 48) ×Solanum chacoense Bitt. (2n = 2x = 48) cross by selecting for resistance to potato leafhopper (PLH) (Empoasca fabae Harris), were tested in the field. In F2 and F4 populations, the levels of nymphal infestation and leaf necrosis from PLH feeding were considerably lower and tuber yields were much lower compared with those measured on the susceptible cultivar Kennebec. No differences were found between the two populations. Backcrosses of the F2 and F4 populations toS. tuberosum decreased resistance to PLH. Resistance to infestation was still greater than that of Kennebec; severity of leaf necrosis equaled that of Kennebec. Tuber yields increased, but were less than Kennebec’s yield. Foliage types shifted closer to those ofS. tuberosum. Three generations of selection and intercrossing within the backcross populations did not change the level of resistance to PLH but did tend to lower tuber yields. Foliage types remained primarilyS. tuberosum in appearance although distinctive types segregated with increased frequency. A second backcross toS. tuberosum did not change the level of resistance to PLH or the level of tuber yield relative to those of the first backcross or Kennebec.

Compendio

Se probaron en el campo poblaciones de intercruzamientos y retrocruzamientos obtenidas de un cruzamiento deSolanum tuberosum L. (2n = 2x = 48) ×Solanum chacoense Bitt. (2n = 2x = 48) al seleccionar para resistencia a la cigarrita de la papa (PLH) (Empoasca fabae Harris). En poblaciones F2 y F4, los niveles de infestatión de ninfas y de necrosis foliar por la alimentatión de la PLH fueron considerablemente más bajos y los rendimientos en tubérculos mucho menores en comparación con aquellos registrados sobre el cultivar susceptible Kennebec. No se observaron diferencias entre las dos poblaciones.

Los retrocruzamientos de las poblaciones F2 y F4 aS. tuberosum disminuyeron la resistencia a la PLH. La resistencia a la infestación fue aún mayor que aquella de Kennebec; la severidad de la necrosis foliar igualó a la de Kennebec. Los rendimientos en tubérculos se incrementaron, pero fueron menores que el rendimiento de Kennebec. Los tipos de follaje se hicieron más semejantes a aquellos deS. tuberosum. Tres generaciones de selección e intercruzamiento dentro de las poblaciones de retrocruzamiento no cambiaron el nivel de resistencia a PLH, pero tendieron a bajar los rendimientos en tubérculos. Los tipos de follaje permanecieron pareciéndose principalmente aS. tuberosum aun cuando tipos muy especiales segregaron con creciente frecuencia. Un segundo retrocruzamiento aS. tuberosum no cambió el nivel de resistencia a PLH o el nivel de rendimiento en tubérculos en relatión con el del primer retrocruzamiento o el de Kennebec.

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Sanford, L.L., Ladd, T.L. Performance of populations derived by selecting for resistance to potato leafhopper in A 4XSolanum Tuberosum X 2XSolanum Chacoense cross. American Potato Journal 69, 391–400 (1992). https://doi.org/10.1007/BF02877490

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