<abstract xmlns="http://www.w3.org/1999/xhtml"> We describe alloenzyme variation in A. angustifolia populations of three separate geographical areas in southern Brazil. The genetic structure of populations was examined in seedtrees, embryos and effective pollen. Seven out of 24 enzyme loci were polymorphic. The average number of alleles per locus (24 loci) was 1.54, with 2.44 alleles per polymorphic locus. Mean expected and observed heterozygosities at the polymorphic loci were He = 0.128 and Ho = 0.132 for seed-trees, and He = 0.142 and Ho = 0.161 for embryos. All measures of genetic variability were highest in the most northern populations. Differences among localities explained 84.14% and 92.06% of the total genetic diversity in embryos and seed trees, respectively. Sex ratio was 1:1 in almost all populations. Female and male gene pools differed in allele frequencies, most significantly at loci 6- Pgdh-B and Skdh-B. This explains the excess of heterozygotes detected among embryos. No inbreeding or excess of heterozygotes was detected among adult seed trees. Genetic variation in A. angustifolia revealed a latitudinal gradient.</abstract>

We describe alloenzyme variation in A. angustifolia populations of three separate geographical areas in southern Brazil. The genetic structure of populations was examined in seedtrees, embryos and effective pollen. Seven out of 24 enzyme loci were polymorphic. The average number of alleles per locus (24 loci) was 1.54, with 2.44 alleles per polymorphic locus. Mean expected and observed heterozygosities at the polymorphic loci were He = 0.128 and Ho = 0.132 for seed-trees, and He = 0.142 and Ho = 0.161 for embryos. All measures of genetic variability were highest in the most northern populations. Differences among localities explained 84.14% and 92.06% of the total genetic diversity in embryos and seed trees, respectively. Sex ratio was 1:1 in almost all populations. Female and male gene pools differed in allele frequencies, most significantly at loci 6- Pgdh-B and Skdh-B. This explains the excess of heterozygotes detected among embryos. No inbreeding or excess of heterozygotes was detected among adult seed trees. Genetic variation in A. angustifolia revealed a latitudinal gradient.

Variation and Population Structure at Enzyme Gene Loci in Araucaria angustifolia (Bert.) O. Ktze

Silvae Genetica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

We describe alloenzyme variation in A. angustifolia populations of three separate geographical areas in southern Brazil. The genetic structure of populations...

Variation and Population Structure at Enzyme Gene Loci in Araucaria angustifolia (Bert.) O. Ktze

Publié en ligne: 27 oct. 2017

Pages: 12 - 19

Reçu: 18 août 2003

DOI: https://doi.org/10.1515/sg-2004-0003

Mots clés
Paraná pine, alloenzymes, genetic variation, differentiation of populations, paleohistory

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Variation and Population Structure at Enzyme Gene Loci in Araucaria angustifolia (Bert.) O. Ktze

Publié en ligne: 27 oct. 2017

Pages: 12 - 19

Reçu: 18 août 2003

DOI: https://doi.org/10.1515/sg-2004-0003

Mots clésParaná pine, alloenzymes, genetic variation, differentiation of populations, paleohistory

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Mots clés
Paraná pine, alloenzymes, genetic variation, differentiation of populations, paleohistory