Abstract
SummaryData on the production of offspring of 4×× 2× crosses in potato are presented. The ploidy composition of seedlings varied from year to year and parent to parent. Products of dihaploid induction crosses were chiefly 2× or 3× whereas crosses between S. tuberosum cultivars and unreduced gamete‐producing S. phureja clones were mainly 3× or 4×.Substantial percentages of 3× seedlings were produced by some crosses in some years. It was concluded that the so‐called ‘triploid block’ in potatoes is a variable phenomenon and that factors which increase seed production may suppress the proportion of triploids produced.
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