Them aim scope of this study is to characterize the enzymatic polymorphism found in the Melipona quadrifasciata Lepeletier, 1936 populations from Ribeirão Preto, São Paulo and Espírito Santo, Brazil and its hybrids. Samples from each colony (about 52) were prepared for starch gel electrophoresis in order to investigate the genetic variation of the following enzimes: esterase (EST), isocitrate dehydrogenase (IDH), malic enzyme (ME), phosphoglucomutase (PGM), superoxide desmutase (SOD), α-glycerophosphate dehydrogenase (αPGD), malate dehydrogenase (MDH), leucine aminopeptidase (LAP), hexokinase (HK) and phosphoglucose isomerase (PGI). The analysis showed that LAP and HK did not show enzymatic activity and EST showed two alleles(est-sand and est-f) while all the others were shown to be monomorphic. The allele EST-S showed a frequency of 82,6%.

Seis isoenzimas de esterase foram estudadas durante o desenvolvimento de Anopheles darlingi usando eletroforese em gel de poliacrilamida e dois substratos diferentes, a-naftilacetato e a-naftliproprlonato. Esterases 5 e 6 foram detectados em todos os estágios do desenvolvimento, esterases 1 e 2 foram coradas com maior intensidade em larva, enquanto esterases 3 e 4 foram melhor visualizadas em pupa e adulto. Foram observadas grandes diferenças na intensidade de algumas isoenzimas durante o estágio de pupa,Quatro das seis isoenzimas revelaram variações na mobilidade eletroforética. A esterase 1 foi a escolhida para estudos genéticos, em virtude de ter sido a isoenzima que apresentou melhor coloração no gel. Dois alelos codominantes (Est 2*S e Est 2*F) codificam para este sistema polimórfico, com a freqüência de Est*S igual a 0,521. A distribuição fenotipica está de acordo com o esperado em Hardy - Weinberg.

Six esterase isozymes were studied during the development of Anopheles darlingi by using polyacrylamide gel electrophoresis and two different substrates, a-naphthylcelate and a-naphthylpropionate. Esterases 5 and 6'were detected in all developmental stages esterases 1 and 2 were more intensively stained if larvae, while esterases 3 and 4 were better visualized in pupae and adults. Strong differences in intensity of some of the isozymes were observed during the pupal stage.Four out of the six isozymes showed variation in the electrophoretic mobility. Esterase-2 was choosed for genetic studies, because was the best stained isozyme in the gels. Two codominant alleles {Est2*S and Est2*F) code for this polymorphic system, with the Est*S frequency equal to 0.521. Phenotypic distribution is in agreement with hardy-Weinberg expectations.