-(Genetic characterization of natural populations of "araticunzeiro" (Annona crassiflora Mart. -Annonaceae) collected in the State of Goiás, Brazil). The level and distribution of the genetic variability in natural populations of "araticunzeiro" were estimated using a sample of six natural populations, collected in two different regions of the State of Goiás, Brazil. Samples comprising 30 individuals from each population were genetically evaluated for four allozyme loci: 6-Phosphogluconate Dehydrogenase (6PGD), Phosphoglucomutase (PGM), Malate Dehydrogenase (MDH) and Leucine Aminopeptidase (LAP). Two dimeric loci were detected for the 6PGD isozyme system while all the other systems evaluated showed typical monomeric loci pattern. No polymorphism was detected for the MDH enzymatic system. The estimated average number of alleles per polymorphic loci was two. The estimated total heterozygosity (averaged across loci) was 0.357, suggesting that a high level of genetic variability is present in the species along the sampled geographic region. About 19% of the total genetic variation was found to be due to differences at the population level, suggesting the existence of a high genetic divergence among populations. Accordingly, the analysis of variance of allelic frequencies for each polymorphic loci showed a strong genetic structure at the population level. Significant values for the average coefficients of coancestry among individuals within populations and for total inbreeding were found. The genetic divergences between pairs of populations showed to be partially correlated to the geographic distances between pair members. Results obtained here suggested that A. crassiflora is preferentially alogamous, in conformity with other authors findings.Key words -Annona, "cerrado", genetic characterization, isozyme RESUMO -(Caracterização genética de populações naturais de araticunzeiro (Annona crassiflora Mart. -Annonaceae) no Estado de Goiás). No intuito de avaliar a magnitude e a distribuição da variabilidade genética existente em populações naturais de araticunzeiro, seis populações oriundas de duas regiões do Estado de Goiás foram amostradas (30 indivíduos cada) e analisadas para quatro sistemas enzimáticos: 6-Fosfogluconato Desidrogenase (6PGD), Fosfoglucomutase (PGM), Malato Desidrogenase (MDH) e Leucina Aminopeptidase (LAP). Dois locos diméricos foram encontrados para a enzima 6PGD, e um loco monomérico para os demais sistemas. Somente a enzima MDH apresentou monomorfismo em todas as populações, sendo que o número médio de alelos por loco polimórfico foi igual a dois. A heterozigosidade total média foi de 0,357, denotando a existência de elevada variabilidade genética na região para esta espécie. Cerca de 19% da variação genética total foram devidos a diferenças interpopulacionais, indicando uma elevada divergência genética entre as populações. A análise de variância das freqüências alélicas para os locos polimórficos no conjunto de populações evidenciou um elevado grau de estruturação genética em nível popul...
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