Please use this identifier to cite or link to this item:
http://ri.ufrb.edu.br/jspui/handle/123456789/3560| metadata.dc.type: | Tese |
| metadata.dc.degree.level: | Mestrado Acadêmico |
| Title: | Seleção de descritores informativos caracterização de germoplasma de mandioca. |
| metadata.dc.creator: | Filho, Osvaldo Sebastião De Oliveira |
| metadata.dc.contributor.advisor1: | Oliveira, Eder Jorge de |
| metadata.dc.contributor.advisor-co1: | Santos, Vanderlei da Silva |
| metadata.dc.contributor.referee1: | Costa, Maria Angélica Pereira De Carvalho |
| metadata.dc.description.resumo: | ABSTRACT: Brazil is considered the center of diversity of cassava (Manihot esculenta Crantz). Therefore, it is necessary to invest in its use for the development of products and technologies. This study aimed to investigate two main points for the germplasm management and conservation, which are the selection of most informative descriptors for germplasm characterization and evaluation, and the clustering of genetic diversity based on qualitative and quantitative descriptors. Ninety-five cassava accessions previously characterized for 51 morpho-agronomic descriptors were analyzed. In the first study multiple correspondence analysis (MCA), based on four methods of selecting descriptors were used. It was observed that about 30 descriptors were able to represent more than 90% of the genetic variability in the first three axes of the MCA. Moreover, 32 morpho-agronomic descriptors with high ability to discriminate cassava germplasm and high correlation with the full set of descriptors (0.81) were selected. In the second study the genetic variation of cassava accessions based on quantitative traits (QT) and joint analysis (QQT) (quantitative and qualitative), using the WardMLM method was evaluated. Five and four groups were identified based on the QT and QQT analysis, respectively. In general, it was observed that most accessions presented high maximum assignment probability (> 0.90) within each cluster. Differences in clustering according to the type of data indicate that quantitative and qualitative traits possibly analyze different genomic regions. However, the joint analysis using the Ward-MLM procedure clustered genotypes with high phenotypic differences. |
| Keywords: | Manihot esculenta Crantz Genetic diversity Genetic resources Management, use |
| Publisher: | Universidade Federal do Recôncavo da Bahia |
| metadata.dc.publisher.department: | CCAAB - Centro de Ciências Agrárias, Ambientais e Biológicas |
| metadata.dc.publisher.program: | Programa de Pós-Graduação em Recursos Genéticos Vegetais |
| Issue Date: | May-2014 |
| metadata.dc.subject.cnpq: | CNPQ::CIENCIAS BIOLOGICAS |
| metadata.dc.rights: | Acesso Aberto |
| metadata.dc.date.available: | 2024-09-19T17:31:38Z |
| URI: | http://ri.ufrb.edu.br/jspui/handle/123456789/3560 |
| Appears in Collections: | CCAAB - PPG-RGV - Artigos publicados em periódicos |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Selecao_Descritore_Informativo_TESE_2014.pdf | 1,7 MB | Adobe PDF | View/Open | |
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