Leaf extracts of diploid guayule were analyzed for phosphoglucomutase (PGM, EC 18.104.22.168) and menadione reductase (MNR, EC 22.214.171.124) isozymes by starch gel electrophoresis. Banding patterns of hybrids indicated that PGM is monomeric and MNR tetrameric in structure. Two codominant alleles were identified at each of two Pgm loci, designated as Pgm-2 and Pgm-3. Two codominant alleles were observed at Mnr-2; MNR-1 was monomorphic in the Parthenium argentatum genotypes analyzed.
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