ARS | Publication request: Tuberization Response to Photoperiod in Potato Haploid-Wild Species Hybrids

Submitted to: Plant Breeding Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: July 31, 2009
Publication Date: August 3, 2009
Citation: Kittipadakul, P.P., Jansky, S.H. 2009. Tuberization Response to Photoperiod in Potato Haploid-Wild Species Hybrids [abstract]. Plant Breeding Conference Proceedings. p. 12.

Technical Abstract: Many useful quality and disease resistance traits for potato improvement come from wild Solanum relatives. Thus, an understanding of inheritance of tuberization in hybrid populations between wild and cultivated potatoes is important for the integration of good traits from wild potatoes. Four families of haploid-wild species hybrids (500 hybrids) were created in 2006. Two wild diploid species clones, 57-10 (S. microdontum) and 523-3 (S. chacoense), were used as male parents in the production of the haploid wild species hybrids. Two diploid cultivated potato clones, US-W730 and US-W973 (derived from the Wisconsin advanced selection W231), were used as the female parents of the hybrids. These four populations were evaluated in a greenhouse for two years (2007 and 2008) for their response to three photoperiods (20, 14, and 8 hour daylengths) using a cutting technique. They were also evaluated in the field in 2008. Most clones did not tuberize at 20 hours and did tuberize at 14 and 8 hours. Segregation for tuberization was observed at 14 hours daylength and this daylength distinguishes between the wild type and the cultivated type among the hybrids. At the long photoperiod (20 and 14 hour daylength) the cultivated parents were more important than the wild potato parents in determining the tuberization response of offspring. At the short photoperiod (8 hours) differences among wild potato parents were apparent. The strong correlation between field data and the 20 and 14 hour photoperiod mean scores for cuttings indicate the cutting technique at the 14 hour daylength may be used to evaluate the new hybrids from haploid-wild species populations in the early stages of a potato breeding program for tuberization.