RESUMO
Markers are an important tool in plant breeding, which can improve conventional phenotypic breeding, generating more accurate information outcoming better decision making. This study aimed to apply and compare the fit of different Bayesian models BRR, BayesA, BayesB, BayesB (setting the value from very low to [Formula: see text] = [Formula: see text]), BayesC and Bayesian Lasso (LASSO) for predictions of the genomic genetic values of productivity and quality traits of a guava population. The models were fitted for traits fruit mass, pulp mass, soluble solids content, fruit number, and production per plant in the genomic prediction with SSR markers, obtained through the CTAB extraction method with 200 primers. The Bayesian ridge regression model showed the best results for all traits and was chosen to predict the individual's genomic values according to the cross-validation data. A good stabilization of the Markov and Monte Carlo chains was observed with the mean values close to the observed phenotypic means. Heritabilities showed good predictive accuracy. The model showed strong correlations between some traits, allowing indirect selection.
RESUMO
ABSTRACT: The collection and characterization of tomato germplasm are of relevant importance for agriculture. This study aimed to collect and characterize, by way of morphological description and statistical tools for the composition of groups, tomato accesses from the Southern and Serrana regions of the State of Espírito Santo, as well as to establish the tomato germplasm bank of the Ifes - Campus de Alegre. Thirty-seven accessions were collected from different commercial locations of Espírito Santo. The experiment was conducted in the Ifes Campus de Alegre in the Agroecology sector. For the morpho-agronomic characterization, sixteen essential descriptors were used, nine quantitative and seven qualitative. In the color of the ripe fruit, there was the formation of five distinct groups with the colors yellow, green, orange, pink and red. In the format of the fruit, three groups were formed, slightly flattened, flattened and rounded. The ANOVA showed that there was a significant difference for all the quantitative characteristics evaluated. According to the Ward-MLM procedure, due to the high likelihood function in group seven (from 130.71), it was possible to group the 37 genotypes into seven groups. The greatest dissimilarity was observed in groups V and VII with a distance of 330.02, and the least dissimilar ones, groups IV and VI, with 8.21. Genetic variability was detected in tomato germplasm for the morpho-agronomic characteristics. Many of the accessions are promising sources of phenotypes of interest to the Ifes germplasm bank.
RESUMO: A coleta e caracterização do germoplasma de tomate são de relevante importância para a agricultura. O presente trabalho objetivou coletar e caracterizar, por intermédio de descritores morfoagronômicos e ferramentas estatísticas, os acessos de tomate das regiões Sul e Serrana do Estado do Espírito Santo, bem como constituir o banco de germoplasma de tomate do Ifes, Campus de Alegre. Foram coletados 37 acessos de tomate em diferentes pontos comerciais do Espírito Santo. O experimento foi conduzido no Setor de Olericultura do Ifes Campus de Alegre. Para a caracterização morfoagronômica, foram utilizados 16 descritores essenciais, 9 quantitativos e 7 qualitativos. Para a característica cor do fruto maduro, houve a formação de cinco distintos grupos com as cores amarelo, verde, laranja, rosa e vermelha. No formato do fruto, houve formação de três grupos, ligeiramente achatado, achatado e arredondados. A ANOVA mostrou que houve diferença significativa para todas as características quantitativas avaliadas. Pelo procedimento Ward-MLM, devido a elevada função de verossimilhança no grupo sete (de 130.71), foi possível agrupar os 37 genótipos em sete grupos. A maior dissimilaridade foi observada nos grupos V e VII com distância de 330.02, e os menos dissimilares, os grupos IV e VI, com 8.21. Detectou-se variabilidade genética no germoplasma de tomate para as características morfo-agronômicas. Muitos dos acessos são promissoras fontes de fenótipos de interesse para o banco de germoplasma do Ifes.
