Abstract

Progeny families of 4x−2x hybrids between Group Tuberosum and Group Phureja-haploid Group Tuberosum hybrids were evaluated under simulated commercial agricultural practices in 1974 and 1975. The range of the observed values for the 4x−2x hybrids exceeded the range of the 4x parents for nearly all measured traits. The mean for total yield of the 4x−2x hybrids was equal to (1974 experiment or significantly higher (1975 experiment) than the mean of the 4x parents. In the 1975 experiment 17.8% of the 4x−2x hybrids produced a higher total yield than the highest yielding 4x parents. The 4x−2x hybrids exhibited a significantly lower mean than the 4x parents for marketable yield and tuber weight but transgressive segregants were found for these traits in both experiments. The heterosis and variability of the hybrids indicates that this breeding method is a potentially powerful tool in potato improvement.

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