The polymorphisms of phosphoglucose isomerase (PGI) in sweetpotato and I. trifida were examined. Horizontal starch gel electrophoresis was used to analyze leaf and pollen tissue of parents and progenies of 10 crosses. Analyses revealed that PGI was a dimeric enzyme system controlled by 5 loci. The segregation ratios did not suggest that PGI was a duplicate system and therefore did not indicate hexaploidy. Only 2 loci appeared to be present in I. trifida. No observed band was related to different ploidy levels in I. batatas and I. trifida. No linkage was identified among the loci.
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