Use este identificador para citar ou linkar para este item:
http://repositorio.ufla.br/jspui/handle/1/42143
Título: | Efficacy of gaussian mixture models for genotype selection in coffee bean |
Título(s) alternativo(s): | Eficácia dos modelos de mistura gaussiano para seleção de genótipos de cafeeiro |
Autores: | Gonçalves, Flávia Maria Avelar Balestre, Márcio Carneiro, Vinicius Quintão Novaes, Evandro Andrade, Alan carvalho Ferreira, André Dominghetti |
Palavras-chave: | Modelos de mistura Modelos mistos Café - Seleção genômica Mixture model Mixed models Coffee - Genomic selection Café - Melhoramento genético Coffee - Genetic improvement |
Data do documento: | 30-Jul-2020 |
Editor: | Universidade Federal de Lavras |
Citação: | VIEIRA JUNIOR, I. C. Eficácia dos modelos de mistura gaussiano para seleção de genótipos de cafeeiro. 2020. 80 p. Tese (Doutorado em Genética e Melhoramento de Plantas) – Universidade federal de Lavras, Lavras, 2020. |
Resumo: | Coffee is one of the most important traded commodities in the world. It is well known that coffee bean yield is subjected to strong variation through the years in a phenomenon called biennial growth. This behavior has imposed great challenges on statistical analysis of coffee bean yield data. In these species genotypes show a differential biennial behavior due to its physiological response to environmental condition which suggests a mixture of subpopulations. Previous studies have tried to solve the problem, however they assume the presence of only one stochastic process generating the phenotypes. In the first paper it is proposed a finite mixture model to deal with the biennial pattern as hidden variable. Individual (per harvest) and repeated measures analyses were performed using conventional mixed models and Gaussian mixture mixed models. The results showed a great increase on parameter efficiency estimation and lead to greater genetic gain suggesting that for analysis of C. arabica progenies exhibiting different biennial patterns, mixture mixed models are superior to traditional mixed models and to models that structure biennial effects using covariance matrices. On the second paper the gaussian mixed mixture model is extended for genomic prediction (GMGBLUP) and compared with a traditional genomic prediction model (GBLUP). The aim was to verify the prediction accuracy when the markers effects are corrected for bias of the biennial growth. For the real data set the GBLUP performed better in all harvests, however the simulated data results showed that the GMGBLUP is superior when the subpopulations means are contrasting and the mixture parameter is close to 0.5. The results suggest that GMGBLUP should be considered as an alternative for genomic prediction in coffea genus, especially for species with strong biennial growth behavior. |
URI: | http://repositorio.ufla.br/jspui/handle/1/42143 |
Aparece nas coleções: | Genética e Melhoramento de Plantas - Doutorado (Teses) |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
---|---|---|---|---|
TESE_Efficacy of gaussian mixture models for genotype selection in coffee bean.pdf | 4,71 MB | Adobe PDF | Visualizar/Abrir |
Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.