Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci
Autor(a) principal: | |
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Data de Publicação: | 2003 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Genetics and Molecular Biology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300022 |
Resumo: | A modified reciprocal recurrent selection (RRS) method, which employed one cycle of high-intensity selection, was applied to two tropical maize (Zea mays L.) populations, BR-105 and BR-106, originating the improved synthetics IG-3 and IG-4, respectively. In the present study the effects of this kind of selection on the genetic structure of these populations and their synthetics were investigated at 30 microsatellite (SSR) loci. A total of 125 alleles were revealed. A reduction in the number of alleles was observed after selection, as well as changes in allele frequencies. In nearly 13% (BR-105) and 7% (BR-106) of the loci evaluated, the changes in allele frequencies were not explained, exclusively due to the effects of genetic drift. The effective population sizes estimated for the synthetics using 30 SSR loci were similar to those theoretically expected after selection. The genetic differentiation (G ST) between the synthetics increased to 77% compared with the original populations. The estimated R ST values, a genetic differentiation measure proper for microsatellite data, were similar to those obtained for G ST. Despite the high level of selection applied, the total gene diversity found in the synthetics allows them to be used in a new RRS cycle. |
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Genetics and Molecular Biology |
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Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite locipopulation geneticsplant breedingmolecular markersA modified reciprocal recurrent selection (RRS) method, which employed one cycle of high-intensity selection, was applied to two tropical maize (Zea mays L.) populations, BR-105 and BR-106, originating the improved synthetics IG-3 and IG-4, respectively. In the present study the effects of this kind of selection on the genetic structure of these populations and their synthetics were investigated at 30 microsatellite (SSR) loci. A total of 125 alleles were revealed. A reduction in the number of alleles was observed after selection, as well as changes in allele frequencies. In nearly 13% (BR-105) and 7% (BR-106) of the loci evaluated, the changes in allele frequencies were not explained, exclusively due to the effects of genetic drift. The effective population sizes estimated for the synthetics using 30 SSR loci were similar to those theoretically expected after selection. The genetic differentiation (G ST) between the synthetics increased to 77% compared with the original populations. The estimated R ST values, a genetic differentiation measure proper for microsatellite data, were similar to those obtained for G ST. Despite the high level of selection applied, the total gene diversity found in the synthetics allows them to be used in a new RRS cycle.Sociedade Brasileira de Genética2003-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300022Genetics and Molecular Biology v.26 n.3 2003reponame:Genetics and Molecular Biologyinstname:Sociedade Brasileira de Genética (SBG)instacron:SBG10.1590/S1415-47572003000300022info:eu-repo/semantics/openAccessPinto,Luciana RossiniVieira,Maria Lucia CarneiroSouza Jr.,Claudio Lopes deSouza,Anete Pereira deeng2003-09-29T00:00:00Zoai:scielo:S1415-47572003000300022Revistahttp://www.gmb.org.br/ONGhttps://old.scielo.br/oai/scielo-oai.php||editor@gmb.org.br1678-46851415-4757opendoar:2003-09-29T00:00Genetics and Molecular Biology - Sociedade Brasileira de Genética (SBG)false |
dc.title.none.fl_str_mv |
Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci |
title |
Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci |
spellingShingle |
Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci Pinto,Luciana Rossini population genetics plant breeding molecular markers |
title_short |
Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci |
title_full |
Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci |
title_fullStr |
Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci |
title_full_unstemmed |
Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci |
title_sort |
Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci |
author |
Pinto,Luciana Rossini |
author_facet |
Pinto,Luciana Rossini Vieira,Maria Lucia Carneiro Souza Jr.,Claudio Lopes de Souza,Anete Pereira de |
author_role |
author |
author2 |
Vieira,Maria Lucia Carneiro Souza Jr.,Claudio Lopes de Souza,Anete Pereira de |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Pinto,Luciana Rossini Vieira,Maria Lucia Carneiro Souza Jr.,Claudio Lopes de Souza,Anete Pereira de |
dc.subject.por.fl_str_mv |
population genetics plant breeding molecular markers |
topic |
population genetics plant breeding molecular markers |
description |
A modified reciprocal recurrent selection (RRS) method, which employed one cycle of high-intensity selection, was applied to two tropical maize (Zea mays L.) populations, BR-105 and BR-106, originating the improved synthetics IG-3 and IG-4, respectively. In the present study the effects of this kind of selection on the genetic structure of these populations and their synthetics were investigated at 30 microsatellite (SSR) loci. A total of 125 alleles were revealed. A reduction in the number of alleles was observed after selection, as well as changes in allele frequencies. In nearly 13% (BR-105) and 7% (BR-106) of the loci evaluated, the changes in allele frequencies were not explained, exclusively due to the effects of genetic drift. The effective population sizes estimated for the synthetics using 30 SSR loci were similar to those theoretically expected after selection. The genetic differentiation (G ST) between the synthetics increased to 77% compared with the original populations. The estimated R ST values, a genetic differentiation measure proper for microsatellite data, were similar to those obtained for G ST. Despite the high level of selection applied, the total gene diversity found in the synthetics allows them to be used in a new RRS cycle. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300022 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300022 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1415-47572003000300022 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Genética |
publisher.none.fl_str_mv |
Sociedade Brasileira de Genética |
dc.source.none.fl_str_mv |
Genetics and Molecular Biology v.26 n.3 2003 reponame:Genetics and Molecular Biology instname:Sociedade Brasileira de Genética (SBG) instacron:SBG |
instname_str |
Sociedade Brasileira de Genética (SBG) |
instacron_str |
SBG |
institution |
SBG |
reponame_str |
Genetics and Molecular Biology |
collection |
Genetics and Molecular Biology |
repository.name.fl_str_mv |
Genetics and Molecular Biology - Sociedade Brasileira de Genética (SBG) |
repository.mail.fl_str_mv |
||editor@gmb.org.br |
_version_ |
1752122378670833664 |