Abstract
Fraction 1 protein from five species of Petunia and selected genetic lines and cultivars of Petunia hybrida Vilm. has been isolated and purified using a specific immunoabsorbent. Isoelectric focusing of the S-carboxymethylated protein in the presence of 8 M urea resolved three large subunit polypeptides with identical isoelectric focusing patterns for all five species and the P. hybrida Vilm. cultivars and lines. Two small subunit polypeptides are commonly shared by P. axillaris, P. hybrida, P. inflata, P. parodii and P. violacea, whilst the species P. parviflora had a single polypeptide located between the two polypeptides found in the other species and cultivars. The electrofocusing pattern of the small subunit polypeptides confirmed the established taxonomic relationships among these Petunia species based on breeding behaviour, chromosome number, morphology and biochemical analyses.
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