Abstract
Two interfertile species ofCucurbita, the wildC. texana and the domesticatedC. pepo (var.medullosa), were hybridized to elucidate the genetic basis of inter-specific differences in isozyme phenotypes. Presented here are descriptions of phenotypes associated with 6 enzyme systems (GOT, IDH, MDH, PER, PGI, PGM). Genetic interpretation for 6 gene loci and 12 alleles is based on F2 segregation data while 10 additional loci and 15 alleles are presumed on the basis of phenotypic variation found throughout theC. pepo complex. A coefficient of genetic identity calculated for single populations of each taxon was within the range that traditionally separates species. However, observations on phenotypes in both taxa leave the taxonomic delimitation of C. texana unresolved. The complexity of banding patterns in some enzyme systems suggests a polyploid origin for the genus Cucurbita.
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