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Previous issue date: 2010 / A estima??o de par?metros gen?ticos em esp?cies vegetais perenes ? comumente feita por meio de delineamentos gen?tico-estat?sticos que levam em considera??o efeitos de prog?nies e popula??es. Dados de experimentos com essas bases n?o existem para o pequi. O presente trabalho teve por objetivo avaliar caracteres de crescimento e estimar par?metros gen?ticos em Pequi (Caryocar brasiliense Camb.) no est?gio precoce. O experimento foi instalado com mudas oriundas de 31 prog?nies (matrizes), de duas proced?ncias (Curvelo, MG e S?o Gon?alo do Rio Preto, MG) utilizando um Delineamento em Blocos Casualizados com seis repeti??es e cinco plantas por parcela, no munic?pio de Carbonita, MG. Foram avaliados os caracteres altura de planta (cm), em setembro de 2005; altura de planta e di?metro do caule ao n?vel do solo (mm), em fevereiro de 2006 e fevereiro de 2007; e altura de planta, di?metro do caule ao n?vel do solo e di?metro da copa (cm), em setembro de 2008. A estima??o dos par?metros gen?ticos foi feita utilizando-se o Software SELEGEM ? REML/BLUP e as estimavas dos coeficientes de correla??es fenot?picas e gen?ticas entre os caracteres e avalia??es foram obtidas a partir das estimativas dos valores fenot?picos e gen?ticos, respectivamente. As estimativas da herdabilidade no sentido restrito para todos os caracteres avaliados variaram de 0,15 a 0,50. Os coeficientes de varia??o gen?tica individual (CVgi%) de um modo geral foram moderadas. Os coeficientes de determina??o de efeitos de parcela (c2parc) foram de baixa magnitude para todos os caracteres, indicando pouca varia??o ambiental entre estas. As correla??es gen?ticas e fenot?picas foram todas positivas, de elevadas magnitudes e, em sua maioria, altamente significativas. As estimativas de efici?ncia de sele??o obtidas pela express?o de Hamblin & Zimmermann variaram de m?dias a altas para os tr?s caracteres considerados. Portanto, embora n?o sejam de import?ncia direta, os caracteres de crescimento podem ser ?teis na discrimina??o precoce de prog?nies com alta produ??o de frutos ou outras caracter?sticas desejadas, caso sejam geneticamente correlacionados a eles. A sele??o baseada em tais caracteres diminuiria custos e tempo para se completar um ciclo de sele??o, aspecto importante principalmente em esp?cies em que os caracteres de interesse levam anos para se expressarem, como ? o caso da produ??o de frutos em pequi. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2010. / ABSTRACT Genetic parameters for perennial crops are commonly estimated by genetic-statistical designs considering progenies and populations effects. In pequi, a Brazilian endangered and very important tree, there are no data come from these kind of experiments.?This work aimed to evaluate the growth and estimate genetic parameters in early stages for pequi. The trial was installed in Carbonita, MG, with seedlings of 31 trees (progenies) coming from two populations (Curvelo, MG and S?o Gon?alo do Rio Preto, MG) in a randomized block design with six replicates and five plants per plot.?The traits evaluated were: plant height (cm) in September, 2005; plant height and stem diameter at ground level (mm) in February, 2006 and February, 2007; and plant height, stem diameter at ground level and crown diameter (cm) in September, 2008.?Genetic parameters were estimated using the Software SELEGEN- REML/BLUP. Phenotypic and genetic correlation coefficients among traits and evaluations were estimated through phenotypic and genetic values, respectively.?The estimates of narrow sense heritability ranged from 0.15 to 0.50 for all traits. In general, the?coefficients of individual genetic variation (CVgi%) were moderate. The environmental effects among plots were small as showed by the determination coefficient of plots.?Genetic and phenotypic correlation estimates were all positive and, in general, highly significant.?The estimates of Hamblin & Zimmermann Selection Efficiency ranged from intermediate to high for all traits evaluated. Therefore, the growth traits may be useful in early discrimination of progenies with high fruit yield and other desired traits if they are genetically correlated to them.?Selection based on such traits would reduce costs and time to complete one cycle of selection, especially important in species which the traits of interest take years to express, as is the case of fruit yield in pequi.
| Identifer | oai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/529 |
| Date | 22 February 2010 |
| Creators | Giordani, Samuel Cunha Oliveira |
| Contributors | Gon?alves, Fl?via Maria Avelar, Titon, Miranda, Fernandes, Jos? Sebasti?o Cunha, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFVJM, instname:Universidade Federal dos Vales do Jequitinhonha e Mucuri, instacron:UFVJM |
| Rights | info:eu-repo/semantics/openAccess |
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