A new phosphoglucose isomerase zymogram type with two extra bands was investigated in Central Chinese germplasm by starch gel electrophoresis. A 1 normal : 2 heterozygous: 1 new type ratio was obtained from the F2 seeds in the cross of Cutler 71 (normal type) and PI 567635 (new type). The two extra bands are suggested to be produced by a new locus, not by Pgi1, Pgi2, or Pgi3. This proposed new type has no linkage relationships with the Aco3, Aco4, Ap, Pgd1, Pgm1, and W1 loci.
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