Population structure and impact of recurrent selection on popcorn using EST-SSR markers/Estrutura populacional e impacto da selecao recorrente em milho-pipoca por marcadores SSR-EST
The success of any recurrent selection program depends on the genetic variability of the evaluated population, which is used to refer to the diversity of existing alleles at many genetic loci. Thus, the goal of the present study was to investigate the impact of recurrent selection across nine cycles...
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Published in: | Acta scientiarum. Agronomy Vol. 40; no. 1; p. 33 |
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Main Authors: | , , , , , |
Format: | Journal Article |
Language: | Spanish |
Published: |
Universidade Estadual de Maringa
01-01-2018
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Online Access: | Get full text |
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Summary: | The success of any recurrent selection program depends on the genetic variability of the evaluated population, which is used to refer to the diversity of existing alleles at many genetic loci. Thus, the goal of the present study was to investigate the impact of recurrent selection across nine cycles of a UENF-14 popcorn population through the analysis of genetic diversity and structure using microsatellite markers (EST-SSRs). Genomic DNA was extracted from young leaves of 25 individuals from each cycle (C0, C1 C2, C3, C4, C5, C6, C7, and C8), totaling 225 samples from the UENF-14 population. Fifty EST-SSR markers were used for the analysis of genetic diversity across the recurrent selection cycles, 16 of which were polymorphic. Thirty-four alleles were detected, with an average of 2.13 alleles per locus. Throughout all the recurrent selection cycles, there was a reduction in heterozygosity and an increase in inbreeding. The population structure showed a sharing of alleles, inferring that some may be directly related to the main selection characteristics. Keywords: Zea mays L. var. Everta, variability, microsatellite markers, heterozygosity, equilibrium. O exito de qualquer programa de selecao recorrente depende da variabilidade genetica da populacao avaliada, sendo utilizada para se referir a diversidade de alelos existentes nos varios locos geneticos. Assim, o objetivo do presente estudo foi investigar o impacto da selecao recorrente em nove ciclos da populacao UENF-14 de milho-pipoca atraves da analise da diversidade genetica e da estrutura utilizando marcadores microssatelites (SSR-ESTs). O DNA genomico foi extraido de folhas jovens de 25 individuos de cada ciclo (C0, C1C2, C3, C4, C5, C6, C7 e C8) totalizando 225 amostras da populacao UENF-14. Para a analise da diversidade genetica entre os ciclos de selecao recorrentes foram utilizados cinquenta marcadores SSR-ESTs, dos quais 16 revelaram ser polimorficos. Trinta e quatro alelos foram detectados, com uma media de 2,13 alelos por locos. Ao longo de todos os ciclos de selecao recorrentes houve uma reducao na heterozigosidade e aumento na endogamia. A estrutura da populacao mostrou um compartilhamento de alelos inferindo que alguns podem ser direcionados para as principais caracteristicas de selecao. Palavras-chave: Zea mays L. var. Everta, variabilidade, marcadores microssatelites, heterozigosidade, equilibrio. |
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ISSN: | 1679-9275 |
DOI: | 10.4025/actasciagron.v40i1.35218 |