Abstract
Genetic control of seven enzymes in Ipomoea trifida (H.B.K.) G. Don. (diploid, tetraploid, and hexaploid populations) and I. batatas (L.) Lam. was studied by starch gel electrophoresis. Inter- and intraspecific polymorphisms were detected for all enzymes in the populations analyzed, except catalase (CAT, EC 1.11.1.6). Phosphoglucomutase (PGM; EC 2.7.5.1), phosphoglucose isomerase (PGI; EC 5.3.1.9), glutamate oxaloacetate transaminase (GOT; EC 2.6.1.1), menadione reductase (MNR; EC 1.6.99.2), shikimate dehydrogenase (SAD; EC 1.1.1.25), and malate dehydrogenase (MDH; EC 1.1.1.37) collectively were encoded by a minimum of 13 genetic loci resulting in 24 allozymes. Results from the diploid I. trifida were used to infer the genetic basis of these enzymes in the polyploid species. All polyploid populations shared almost the same number of allozymes with diploid I. trifida. PGM and PGI showed evidence of duplicated genes in the polyploid series. A unique allele for MNR was detected only in polyploid series.
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