Modelo dialélico com informação de repetibilidade no melhoramento genético de capim elefante

O capim-elefante é uma cultura perene alógama com reprodução assexuada. Devido a essas características, os melhoristas têm como alternativa desenvolver híbridos para explorar a hetorose. Uma das dificuldades para obter os melhores híbridos é a escolha dos genitores. Uma das alternativas para a escol...

Nível de Acesso:openAccess
Publication Date:2018
Main Author: Ferreira, Ricardo Augusto Diniz Cabral lattes
Orientador/a: Cruz, Cosme Damião
Format: Tese
Language:por
Published: Universidade Federal de Viçosa
Áreas de Conhecimento:
Online Access:http://www.locus.ufv.br/handle/123456789/20123
Citação:FERREIRA, Ricardo Augusto Diniz Cabral. Modelo dialélico com informação de repetibilidade no melhoramento genético de capim elefante. 2018. 33f. Tese (Doutorado em Genética e Melhoramento) - Universidade Federal de Viçosa, Viçosa. 2018.
Resumo inglês:Elephant grass is an allogamous perennial crop with asexual reproduction. Because of these characteristics, the plant breeders have with alternative to develop hybrids to explore the heterosis. One of difficulties to develop hybrids is the choice of the parents. One alternative for this problem is make a crossings following a scheme and analyze the data to estimate the general and specific combination. However, as a perennial crop, several cuttings are made or in other words repeated measured are made, and it difficult to evaluate the data in the statistical analyzes. For this type of data, a simple way to do the analysis is to use repeatability models. In this way, a diallel analysis model that allows to estimate the general and specific combination ability and repeatability would be more adequate instead the models that do not allow the repeatability estimation and, therefore, do not take into account how the data were obtained. Thus, we proposed in the present study, a diallelic analysis model with repeatability and we gave an application of this model in data obtained from a diallel cross of elephant grass. It was used information of five cuttings for morphological traits and two cuttings for nutritive value traits. The diallel model with repeatability information allowed estimate in addition to the genetics effects, information about the number cuttings and genotype x cutting interaction. It was evidenced that the proposed model was a better alternative to analyze the data allowing to estimation of genetic parameters for choosing the best parents, besides taking into account the structure of repeated measurements of the data.