Abstract
Outcrossing rates in potato were measured in an open-pollination field experiment at a location in the Peruvian Andes. Embryo spot, a dominant genetic seed marker, was used to measure outcrossing rate. The source of the dominant marker, the donor, was interplanted among recipient clones lacking the marker (recessive genotype), for which outcrossing was to be measured. Eight out of the 17 clones tested were advanced breeding clones which had wild species cytoplasm. Seven out of eight of these had outcrossing rates above 0.75, showing complete male sterility in one case and partial male sterility in six cases. Among the other clones tested, which were male-fertile, outcrossing estimates ranged from 0.10 to 0.74. Wide variability in outcrossing rate in autotetraploid potato suggests that it should be possible to select for higher outcrossing rate in production of open-pollinated true seed populations of potato for genetic or commercial purposes.
Compendio
En un experimento de campo con polinización libre de papa, se midieron las tasas de intercruzamiento en un lugar de los Andes peruanos. La mancha embrional, un marcador genético dominante de la semilla, fue utilizado para medir la tasa de intercruzamiento. La fuente del marcador dominante, el donante, fue interplantada entre los clones recipientes carentes del marcador (genotipo recesivo), para los cuales se tenía que medir el intercruzamiento. Ocho de los 17 clones probados eran clones avanzados de mejoramiento que tenían citoplasma de especies silvestres. Siete de los ocho tuvieron tasas de intercruzamiento mayores de 0.75, mostrando esterilidad masculina completa en uno de los casos y parcial en los otros seis. Entre los otros clones probados, que eran macho-fértiles, los estimados de intercruzamiento variaron de 0.10 a 0.74. Una gran variación en la tasa de intercruzamiento en papas autotetraploides sugiere que podría ser posible seleccionar para una tasa alta de intercruzamiento en la production de poblaciones de semilla sexual de papa de polinización libre, para propósitos genéticos o comerciales.
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Brown, C.R. Outcrossing rate in cultivated autotetraploid potato. American Potato Journal 70, 725–734 (1993). https://doi.org/10.1007/BF02848678
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DOI: https://doi.org/10.1007/BF02848678