Caracterização molecular de variedades crioulas de pimentas (Capsicum baccatum) com marcadores microssatélites

Atualmente, muitas variedades crioulas de Capsicum baccatumsão cultivadas pelos agricultores no Brasil. Essas populações são fontes de genes para tolerância ou resistência aos estresses bióticos e abióticos. Porém, grande parte dessas variedades está sendo perdida devido à erosão genética causada pe...

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Published inHorticultura brasileira Vol. 32; no. 2; pp. 131 - 137
Main Authors Villela, Juliana CB, Barbieri, Rosa L, Castro, Caroline M, Neitzke, Raquel S, Vasconcelos, Carla S, Carbonari, Taíse, Mistura, Claudete C, Priori, Daniela
Format Magazine Article
LanguageEnglish
Published 01.06.2014
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Abstract Atualmente, muitas variedades crioulas de Capsicum baccatumsão cultivadas pelos agricultores no Brasil. Essas populações são fontes de genes para tolerância ou resistência aos estresses bióticos e abióticos. Porém, grande parte dessas variedades está sendo perdida devido à erosão genética causada pela substituição de cultivares. A fim de conservar e caracterizar as variedades crioulas, a Embrapa Clima Temperado mantém, desde 2002, um Banco Ativo de Germoplasma de Capsicum. Com o objetivo de caracterizar variedades crioulas de C. baccatum com marcadores moleculares de microssatélites, foram analisados vinte acessos que integram o acervo do Banco Ativo de Germoplasma de Capsicum da Embrapa Clima Temperado. O DNA foi extraído individualmente das folhas jovens de cinco plantas de cada acesso. Foram analisados oito loci de microssatélites, identificando um total de 43 alelos. Todos os loci analisados foram polimórficos. A análise molecular da variância mostrou uma diversidade genética de 51,37% entre acessos e 48,63% dentro dos acessos, o que evidenciou a existência de segregação em diversas variedades crioulas de pimentas avaliadas. Os grupos obtidos pela análise de agrupamento não tiveram relação com as características morfológicas dos frutos. A maior proporção da variabilidade genética encontra-se entre as diferentes variedades crioulas, embora também exista variabilidade genética dentro de cada acesso. Currently, many landraces of C. baccatum are grown by farmers in Brazil. These populations are sources of genes for resistance or tolerance to abiotic and biotic stresses. However, most of these landraces are being lost due to genetic erosion caused by substitution of cultivars. In order to characterize and conserve landraces, since 2002 Embrapa Temperate Agriculture maintains an Active Germplasm Bank of Capsicum. This work has the objective to characterize landraces of C. baccatum using microsatellite markers. 20 accessions from the Active Germplasm Bank of Capsicum of Embrapa Temperate Agriculture were analyzed. DNA was extracted individually from young leaves collected from five plants of each accession. Eight microsatellite loci were analyzed. All loci were polymorphic. Molecular analysis of variance showed values of genetic diversity as 51.37% among accessions and 48.63% within the accessions. This fact showed the existence of segregation in many of these pepper landraces. The groups obtained by cluster analysis did not correlate with morphological fruit traits. Most of the genetic variability is found among different landraces, although there is also genetic variability within each accession.
AbstractList Atualmente, muitas variedades crioulas de Capsicum baccatumsão cultivadas pelos agricultores no Brasil. Essas populações são fontes de genes para tolerância ou resistência aos estresses bióticos e abióticos. Porém, grande parte dessas variedades está sendo perdida devido à erosão genética causada pela substituição de cultivares. A fim de conservar e caracterizar as variedades crioulas, a Embrapa Clima Temperado mantém, desde 2002, um Banco Ativo de Germoplasma de Capsicum. Com o objetivo de caracterizar variedades crioulas de C. baccatum com marcadores moleculares de microssatélites, foram analisados vinte acessos que integram o acervo do Banco Ativo de Germoplasma de Capsicum da Embrapa Clima Temperado. O DNA foi extraído individualmente das folhas jovens de cinco plantas de cada acesso. Foram analisados oito loci de microssatélites, identificando um total de 43 alelos. Todos os loci analisados foram polimórficos. A análise molecular da variância mostrou uma diversidade genética de 51,37% entre acessos e 48,63% dentro dos acessos, o que evidenciou a existência de segregação em diversas variedades crioulas de pimentas avaliadas. Os grupos obtidos pela análise de agrupamento não tiveram relação com as características morfológicas dos frutos. A maior proporção da variabilidade genética encontra-se entre as diferentes variedades crioulas, embora também exista variabilidade genética dentro de cada acesso. Currently, many landraces of C. baccatum are grown by farmers in Brazil. These populations are sources of genes for resistance or tolerance to abiotic and biotic stresses. However, most of these landraces are being lost due to genetic erosion caused by substitution of cultivars. In order to characterize and conserve landraces, since 2002 Embrapa Temperate Agriculture maintains an Active Germplasm Bank of Capsicum. This work has the objective to characterize landraces of C. baccatum using microsatellite markers. 20 accessions from the Active Germplasm Bank of Capsicum of Embrapa Temperate Agriculture were analyzed. DNA was extracted individually from young leaves collected from five plants of each accession. Eight microsatellite loci were analyzed. All loci were polymorphic. Molecular analysis of variance showed values of genetic diversity as 51.37% among accessions and 48.63% within the accessions. This fact showed the existence of segregation in many of these pepper landraces. The groups obtained by cluster analysis did not correlate with morphological fruit traits. Most of the genetic variability is found among different landraces, although there is also genetic variability within each accession.
Author Vasconcelos, Carla S
Villela, Juliana CB
Mistura, Claudete C
Neitzke, Raquel S
Priori, Daniela
Castro, Caroline M
Carbonari, Taíse
Barbieri, Rosa L
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Title Caracterização molecular de variedades crioulas de pimentas (Capsicum baccatum) com marcadores microssatélites
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