Abstract
Wild potato species contain many traits of economic importance. Late blight (LB) resistance and cold chipping are traits desired in potato cultivars. These traits could be co-currently introgressed if they occurred together in wild potato species. Our research objectives were (1) to determine if variation for cold chipping exists between potato species, accessions within species, and plants within accessions all having foliar LB resistance, and (2) to identify wild potato genotypes combining LB resistance and cold chipping. Materials include 665 genotypes from 43 LB-resistant accessions of 12 potato species having Endosperm Balance Numbers (EBN) of 1, 2, and 4, and 59 LB-resistant genotypes retained from these accessions for breeding. Potato chips were made from greenhouse-grown tubers following storage at 4 C for 6 months. Chip color was scored 1–10, ≤ 4 is acceptable by industry standards. Most of the variation for chip color was due to differences between species. Species ranged in the percentage of acceptably chipping genotypes (0% – 67%) with nine of 12 species having cold-chipping genotypes. Appreciable variation was present within accessions as well. The best chipping accessions wereS. verrucosum plant introduction (PI) 161173 – 4.33 / 0.67 (mean / proportion acceptable genotypes),S. stoloniferum PI 250510 -4.36 / 0.64,S. pinnatisectum PI 347766 -4.65 / 0.35 and 275233 -4.73 / 0.44, andS. megistacrolobum PI 195210 -5.14 / 0.29. Eleven 1EBN genotypes fromS. pinnatisectum andS. trifidum and five 2EBN genotypes fromS. verrucosum, S. fendleri,S. stoloniferum, andS. microdontum were identified that combined LB resistance and cold chipping. Co-current introgression would require fewer breeding cycles than other breeding methods to identify hybrid genotypes possessing both traits.
Resumen
Las especies silvestres de papa contienen muchas características de importancia económica. La resistencia al tizón tardío (LB por sus siglas en inglés) y al endulzamiento por frío son características muy apreciadas en los cultivares de papa. Ambas podrían ser introgresadas conjuntamente si existieran juntas en las especies silvestres de papa. Los objetivos de nuestra investigación fueron 1) determinar si la variación de la tolerancia al endulzamiento por trío existe entre las especies de papa, entre accesiones de las especies y entre plantas de las accesiones que tienen resistencia foliar al LB, y 2) identificar genotipos de especies silvestres de papa que combinen la resistencia al LB y al endulzamiento por frío. Los materiales incluyen 665 genotipos de 43 accesiones resistentes a LB de 12 especies de papa que contienen un Número Balanceado de Endospermas (EBN en inglés) de 1, 2 y 4, y 59 genotipos resistentes al LB retenidos de esas accesiones para mejoramiento. Se hicieron hojuelas de papa con tubérculos cultivados en invernadero y almacenados a 4C durante 6 meses. El color de las hojuelas tuvo un rango de 1 – 10, ≤ 4 es aceptable para los estándares industriales. Gran parte de la variación en el color de las hojuelas se debié a las diferencias entre especies. Las especies variaron en el porcentaje de genotipos aceptables para hojuelas (0% – 67%), 9 de las 12 especies tuvieron genotipos tolerantes al endulzamiento por frio. Se presentó una variación apreciable también dentro de las accesiones. Las mejores accesiones para hojuelas fueron la introducción de planta deS. verrucosum (PI) 161173 -4.33 / 0.67 (medio / proporción aceptable de genotipos),S. stoloniferum PI 250510 -4.36 / 0.64,S. pinnatisectum PI 347766 -4.65 / 0.35 y 275233 / 4.73 / 0.44, yS. megistacrolobum PI 195210 / 5.14 / 0.29. Se identificaron once genotipos 1EBN deS. pinnatisectum yS. trifidum y 5 genotipos de 2EBN deS. verrucosum, S. fendleri, S. stoloniferum, y S. microdontum que combinaban resistencia al LB y al endulzamiento por frío. La introgresión conjunta requeriría ciclos menores de mejoramiento que los de otros métodos de mejoramiento para identificar genotipos de hibridos que posean ambas características.
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Hayes, R.J., Thill, C.A. Co-current introgression of economically important traits in a potato-breeding program. Am. J. Pot Res 79, 173–181 (2002). https://doi.org/10.1007/BF02871933
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DOI: https://doi.org/10.1007/BF02871933