Abstract
Methods for incorporation of wild species germplasm intoSolanum tuberosum must be developed to efficiently utilize their desirable traits. This study was conducted to determine whether wild species selected for tuberization under long-day conditions produce haploid-species hybrids that tuberize better than hybrids with unselected species parents. Several haploids, US-W730, US-W973 and US-W4139, were crossed with populations ofS. chacoense, S. infundibuliforme, S. kurtzianum, S. megistacrolobum, andS. spegazzinii selected for tuberization under long-day conditions and populations that were unselected. Results from a greenhouse evaluation revealed no apparent differences in tuberization between hybrids with selected species parents and those with unselected species parents. In a field trial, some differences were observed. It appears, from the F1 generation, that it is usually not beneficial to select wild species for tuberization before crossing to selectedS. tuberosum haploids.
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