Yield and tuber characteristics of 4x progeny from 2x×2x crosses |
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Authors: | Joanna E Werner Stanley J Peloquin |
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Institution: | (1) Department of Horticulture and Genetics, University of Wisconsin, 53706 Madison, WI, USA |
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Abstract: | Summary Unrelated, unselected 2x haploid-species hybrids that produce 2n eggs, by second division restitution and 2n pollen due to
first division restitution were intercrossed to generate 4x progeny. The 19, 4x families were compared with seven cultivars
for tuber yield, tuber appearance and tuber set. The mean yield of the 4x families was 30% higher than the mean yield of the
cultivars. The best five 4x families outyielded the best five cultivars by 57% and 69% at two locations. Cultivars were superior
for tuber appearance and tuber set. The high yields of the 4x families are due to genetic diversity of the 2x parents and
their ability to transmit that diversity to the 4x progeny utilizing 2n gametes. The potential of the 2x×2x breeding method
is dependent on developing 2x hybrid clones that form 2n eggs and possess desirable tuber types; clones producing 2n pollen
and good tuber quality are available. |
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Keywords: | FDR 2n gametes SDR 2n gametes allelic diversity maximum heterozygosity bilateral sexual polyploidization Solanum tuberosum L |
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