Esterase polymorphism in remanant populations of Aspidosperma polyneuron Müll.Arg. (Apocynaceae)

Revista Árvore

Vanda Marilza De Carvalho¹  Maria De Fátima Pires Da Silva Machado¹ 

[1] ,State University of Maringa Department of Cell Biology and Genetics

关键词: Apocynaceae;    genetic diversity;    isoesterases;    isozymes;    peroba-rosa;    Apocynaceae;    diversidade genética;    isoesterases;    isoenzimas;    peroba-rosa;   

DOI  :  10.1590/S0100-67622004000500001

来源: SciELO

【 摘 要 】

The population genetic structure of the endangered tree species Aspidosperma polyneuron Mull.Arg. (Apocynaceae) was reported based on analysis of esterase polymorphism in two remanant populations. Allelic variation was detected at three isoesterase loci (Est-3, Est-9, and Est-10). The proportion of polymorphic loci for both populations was 30% and deviation from Hardy-Weinberg equilibrium was observed for the Est-3 locus observed in the northern population. Segregation distortion and the lower level of observed and expected heterozygosity in this population were attributed to founder genotype. The high genetic identity values for northern and northwestern populations are in accordance with the low levels of interpopulation genetic divergence demonstrated by the F(ST) (0.03) value. The F(IS) value (0.23) indicated moderate levels of inbreeding. A. polyneuron can be indicated as an example of endangered species suggesting high genetic variation in contrast to the low genetic variation reported for endangered species. The esterase isozymes may be a good genetic marker for studies of natural A. polyneuron populations.

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