Consulta: creatorFacets:"Pinto,Luciana Rossini"
Registros recuperados: 3
Data/hora: 09/06/2024 19:14:59

Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci
Provedor de dados: 74
Autores: Pinto,Luciana Rossini; Vieira,Maria Lucia Carneiro; Souza Jr.,Claudio Lopes de; Souza,Anete Pereira de.
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...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population genetics; Plant breeding; Molecular markers.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300022

Isoenzymatic variability in tropical maize populations under reciprocal recurrent selection
Provedor de dados: 63
Autores: Pinto,Luciana Rossini; Vieira,Maria Lúcia Carneiro; Souza Jr.,Cláudio Lopes de; Silva,Rainério Meireles da.
Maize (Zea mays L.) is one of the crops in which the genetic variability has been extensively studied at isoenzymatic loci. The genetic variability of the maize populations BR-105 and BR-106, and the synthetics IG-3 and IG-4, obtained after one cycle of a high-intensity reciprocal recurrent selection (RRS), was investigated at seven isoenzymatic loci. A total of twenty alleles were identified, and most of the private alleles were found in the BR-106 population. One cycle of reciprocal recurrent selection (RRS) caused reductions of 12% in the number of alleles in both populations. Changes in allele frequencies were also observed between populations and synthetics, mainly for the Est 2 locus. Populations presented similar values for the number of alleles per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Genetic markers; Genetic variability; Isozymes; Population improvement.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200013

Morphological analysis and DNA methylation in Conyza bonariensis L. cronquist (Asteraceae) phenotypes
Provedor de dados: 53
Autores: Paula,Juliana Maria de; Pinto-Maglio,Cecília Alzira Ferreira; Pinto,Luciana Rossini.
ABSTRACT The species Conyza bonariensis (L.) cause losses in agriculture due to their invasive capacity and resistance to herbicides like glyphosate. The species of this genus exhibit phenotypic plasticity, which complicates their identification and characterization. Thus, experiments were performed with 2 extreme C. bonariensis phenotypes (called broad leaf and narrow leaf) in greenhouse conditions and in the laboratory, in order to verify if the morphological differences among these phenotypes are a genetic character or result from environmental effects. In addition to the comparative morphological analysis, assessment of DNA methylation profile was performed to detect the occurrence, or not, of differences in the epigenetic level. The morphological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phenotypic plasticity; Conyza bonariensis; Resistance; Weeds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400480