Popcorn grown commercially in the U. S. is relatively depauperate in isozymatic variation as compared to dent com, and is also isozymatically somewhat distinct from the latter (Stuber and Goodman, USDA/ARS Agric. Res. Results ARR-S-16, 19S3). Isozymatic monitoring of quality in hybrid popcorn seed production therefore might require slight modifications of the methodology (Smith and Weissinger, MNL 5S:l03-105, 1984; Stuber et al., NCARS Techn. Bull. 286, 19SS) commonly employed with dent com.