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Doctoral Thesis
DOI
https://doi.org/10.11606/T.11.2009.tde-16052011-140803
Document
Author
Full name
Eulália Soler Sobreira Hoogerheide
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 2009
Supervisor
Committee
Pinheiro, José Baldin (President)
Azevedo Filho, Joaquim Adelino de
Oliveira, Giancarlo Conde Xavier
Siqueira, Walter Jose
Veasey, Elizabeth Ann
Title in Portuguese
Divergência genética entre acessos de alho avaliados em ambientes distintos baseada em variáveis quantitativas e qualitativas
Keywords in Portuguese
Alho
Análise de conglomerados
Análise multivariada
Diversidade
Germoplasma vegetal
Variação genética em plantas.
Abstract in Portuguese
O alho situa-se encontra entre as principais olericulturas do Brasil, sendo cultivada em praticamente todas as regiões. Apesar de ser uma planta de sistema de reprodução assexuada, o alho cultivado tem apresentado considerável variabilidade, devido à seleção de mutações espontâneas expressas em caracteres de interesse. Coleções de germoplasma dessa espécie têm sido constituídas em vários países, inclusive no Brasil. As avaliações fenotípicas da diversidade genética dos bancos de germoplasma devem ser as mais completas possíveis. Assim, este trabalho teve por objetivo avaliar a divergência genética, através da análise multivariada, de 63 acessos da coleção de germoplasma do Instituto Agronômico de Campinas e Escola Superior de Agricultura Luiz de Queiroz, com base em dois grupos de variáveis: quantitativas e qualitativas. Os dados foram obtidos de dez variáveis quantitavivas e 18 qualitativas em experimentos conduzidos a campo em 2007, em dois municípios do Estado de São Paulo: Monte Alegre do Sul e Piracicaba, no delineamento de blocos casualizados com cinco repetições. A distância de Mahalanobis (D2) e o complemento aritmético de Jaccard foram utilizados como medidas de divergência para as variáveis quantitativas e qualitativas, respectivamente. Foram aplicadas as técnicas de análise agrupamento do método de otimização de Tocher e UPGMA e correlação entre as matrizes pelo teste de Mantel. Verificou-se que as medidas de divergência foi mais influenciada pelo tipo de variável do que pelo ambiente. Avaliações fidedignas de acessos dessa cultura requerem escolha criteriosa das variáveis ou descritores e dos locais de avaliações.
Title in English
Genetic diversity among garlic accessions evaluated in distinct environments on the basis of quantitative and qualitative variables
Keywords in English
Cluster analysis
Garlic
Multivariate analysis
Plant genetic variation.
Plant germplasm - Diversity
Abstract in English
Garlic is among the main vegetable crop in Brazil, being cultivated through out the country. Despite its asexual reproduction system, cultivated garlic exhibits considerable morphological variation of important traits as result of spontaneous mutations. In Brazil and several others countries germplasm collections are available. The use of accessions in breeding programs requires an adequate evaluation and characterization of the genetic materials. The objective of this work was to evaluate the diversity among 63 accessions of the germplasm collection of the Instituto Agronômico de Campinas and Escola Superior de Agricultura Luiz de Queiroz. Multivariate analysis was used considering quantitative as well as qualitative variable, measured in two locations (Monte Alegre do Sul and Piracicaba, São Paulo State, Brazil). Randomized complete blocks were set up in both locations, with five replications, in 2007. Ten quantitative and 18 qualitative variables were considered, with divergence between accession measures using Mahalanobis (D2) distances and the complement of Jaccards similarity, respectively. Grouping was made using Tochers procedure and the UPGMA method. Correlation of distance between matrices were tested with Mantels procedure. It could be seen that nature of the variable affected measures of distance more strongly than the environment. The correlation of distances between types of variables was low as for the compared of locations. This indicates that for evaluating accessions of this crops ca careful choice of variables and also environments is necessary for obtaining reliable results.
 
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Publishing Date
2011-06-03
 
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