Abstract
A genetic analysis of cytosolic phosphoglucose isomerase (PGI) variation in the tropical tree Pseudobombax munguba (Bombacaceae) was carried out in one population from Central Amazon. It was shown that cytosolic PGI variation is controlled by two diallelic loci (Pgi-2 and pgi-3). All nine possible enzyme phenotypes produced by allelic variation at these two loci were easily identified on gels stained for PGI. Progeny analysis from cross-pollinated families revealed that the two loci assorted independently and exhibited disomic inheritance, suggesting that allopolyploidy may have been the cause of the duplication of the cytosolic PGI gene in this species.
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