Abstract
Haploids (tetraploids and triploids) were obtained from crosses between colchicine-doubled octaploid and natural hexaploid Mexican potato species and the Gp. Phureja clone 1.22 as the pollinator, but none were obtained from crosses of natural 4x(2EBN) Mexican species with 2x(1EBN) pollinators. The manipulation of ploidy and Endosperm Balance Number (EBN) of tetraploid Mexican potato species was useful in explaining the occurrence of pseudogamous parthenogenetic haploid production. The pollinator effect, EBN, and maternal influence are important characters to consider in searching for haploid-inducing pollinators among 2x(2EBN) as well as 2x(1EBN) potato species.
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