Inbreeding and true seed in tetrasomic potato. IV. Synthetic cultivars |
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Authors: | Golmirzaie A Ortiz R |
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Institution: | (1) Centro Internacional de la Papa, Apartado 1558, Lima 100, Perú, PE;(2) International Institute of Tropical Agriculture, c/o L.W. Lambourn & Co., Carolyn House, 26 Dingwall Road, Croydon, CR9 3EE, UK, GB |
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Abstract: | A true potato seed (TPS) synthetic cultivar from open pollination may broaden the genetic base in potato. A synthetic cultivar
can also reduce the effect of inbreeding and maintain the productivity from generation to generation. Selected tetraploid
parental genotypes, based on combining-ability tests, were chosen for isolated polycrosses to obtain tetraploid offspring.
A series of experiments were undertaken to investigate the development of these TPS synthetic populations in two Peruvian
locations: San Ramon, a rainfed, humid, mid-altitude environment, and La Molina, an arid, coastal environment under irrigation.
Natural open-pollinated synthetics or control-mixture synthetics, involving two to six parents, had a similar tuber set but
plant survival and tuber weight were higher in control synthetics including two or six parents. The results suggest that two-parent
open-pollinated TPS synthetics may be a feasible option by selecting the right parents for the base population. A subsequent
experiment showed that four-parent control synthetics (i.e. double crosses) were the best for tuber weight and size, followed
by the two-parent control synthetics. Synthetic breeding populations could be shared with other breeders, who in cooperation
with their local farmers may select promising genotypes for further cultivar release.
Received: 15 December 2000 / Accepted: 4 April 2001 |
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Keywords: | Broadening genetic base Combining ability Farmer participatory breeding Open pollination TPS |
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