Five interspecific Cuphea hybrids were examined for isozyme banding patterns. In three of the five hybrids (C. viscosissima × C. lutea, C. ignea × C. angustifolia, and C. lanceolata × C. viscosissima), F1 plants could be distinguished from either parental species. Phosphoglucomutase and 6-phosphogluconic dehydrogenase enzyme stains produced distinct F1 band patterns for all three hybrids. Phosphoglucose isomerase and shikimate dehydrogenase enzyme stains produced distinct F1 band patterns for C. viscosissima × C. lutea and C. lanceolata× C. viscosissima, respectively. For the C. lanceolata × C. viscosissima hybrid. the banding patterns were used to identify 32 selfs among 161 putative F1 plants.
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