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Navegando EA - Artigos publicados em periódicos por Autor "Aguiar, Ananda Virginia de"
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Item Autocorrelação espacial de caracteres morfológicos em populações naturais de gonçalo-alves (Astronium fraxinifolium Schott.)(2004-04) Aguiar, Ananda Virginia de; Coelho, Alexandre Siqueira Guedes; Moura, Mara Fernandes; Morais, Lizz Kezzy de; Pinheiro, José Baldin; Moraes, Mario Luiz Teixeira de; Zucchi, Maria Imaculada; Moura, Nara Fernandes; Vencovsky, RolandData on eight morphologig traits from 60 individuals of two populations of gonşalo-alves (Astvonium fvasinifotium) logated at margins of highways, evalutated in a progeny test trial, were submitted to the analysis of spatial autogorrelation. The studied populations showed a high level of within genetig variability, but no spatial pattern was detegted. The eight gorrelograms supported the hypotheses of random migration resulting in an inexistenge of spage pattern and that the two gonsidered populations are strugtured at random. The autogorrelation analysis suggested that stoghastig progesses, sugh as migration (mainly through golonization), gould explain the lagk of spatial pattern found within and between populations of Astvonium fvasinifotium. The evaluation of spatial pattern levels of genetig variation is important to understand the dynamigs of alleles among individuals of a spegies, providing important information gongerning the optimization of sampling strategies oriented to gonservation. The absenge of spatial pattern in the genetig variation in the studied populations, along a 1 to 78km sgale, suggests that, within this limit, sampling may be done at random.Item Estabilidade e adaptabilidade de cultivares de soja em diferentes épocas de semeadura utilizando a metodologia AMMI(2003-04) Morais, Lizz Kezzy de; Pinheiro, José Baldin; Moura, Mara Fernandes; Aguiar, Ananda Virginia de; Duarte, João Batista; Carbonell, Sérgio Augusto Morais; Zucchi, Maria Imaculada; Moura, Nara FernandesItem Genetic structure of mangaba (Hancornia speciosa Gomes) populations in the cerrado region of Central Brazil(2011-06) Moura, Nara Fernandes; Chaves, Lázaro José; Vencovsky, Roland; Naves, Ronaldo Veloso; Aguiar, Ananda Virginia de; Moura, Mara FernandesMangaba tree (Hancornia speciosa Gomes) is a fruit species with great potential for commercial exploitation, found in most regions of Brazil and highly frequent in the Cerrado biome. Information on the genetic variability in this biome is scarce. This study aimed at characterizing the genetic structure of eight populations found in the states of Goiás, Bahia and Minas Gerais by using RAPD markers. Genetic variability was assessed by the analysis of variance on molecular data. A significant proportion of genetic variance was found among populations, corresponding to 19.6 % of the total variation. The correlation between the matrices of geographic and genetic distances was not significant, indicating that there is no spatial structure of the genetic variability among the populations, for the RAPD marker loci used here. The high variability suggests that a strategy for in situ, as well as ex situ conservation, must be based on sampling a large number of local populations.Item Genetics and expected selection gain for growth traits in Eugenia dysenterica DC. populations(2009) Aguiar, Ananda Virginia de; Vencovsky, Roland; Chaves, Lázaro José; Moura, Mara Fernandes; Morais, Lizz Kezzy deThe objective of this study was to estimate genetic parameters of quantitative traits in a living germplasm collection of Eugenia dysenterica. The genetic material consisted of 110 progenies derived from 10 natural Eugenia dysenterica subpopulations sampled in the southeastern region of the state of Goiás. The experiment was established in a complete randomized block design, with 110 treatments, four replications and one tree per plot. The study variables were total height, stem diameter and respective growth rates. After the analysis of variance some genetic parameters were estimated. The levels of genetic variation in the collection were high and the highest proportion was found within subpopulations. Highest coefficients of heritability and genetic variation were observed in subpopulations from the counties Catalão, Três Ranchos, Cristalina and Senador Canedo. Considering the promising expected progress for growth traits, this collection can be converted into an unrogued seedling seed orchard, aiming the production of improved seed.Item Produção de frutos e caracterização de ambientes de ocorrência de plantas nativas de araticum no Cerrado de Goiás(2009-06) Braga Filho, Juracy Rocha; Naves, Ronaldo Veloso; Veloso, Valquíria da Rocha Santos; Nascimento, Jorge Luiz do; Aguiar, Ananda Virginia deThis study had the objective to evaluate the production of araticum fruits in the Cerrado of the Goiás State. Fourteen areas with high natural occurrences of araticum in the whole state were selected from January 2000 to July 2002. In each area, thirty to forty mother trees were selected. The experimental research corresponds to the hierarchical model for the fruit production, and that means that the original data was submitted to an analysis of variance. The spatial phenotypic structure variation among populations was investigated through dendrograms by the UPGMA linking criterion. The results demonstrated that the production of araticum fruits is low and changeable in areas and years, and the average corresponds to 2.97 usable fruits and 1.37 not usable fruits per plant. The phenotypic variation of morphologic characters between populations of araticum of the Goiás state does not present a standard of space arrangement. The production of fruits per plant is very changeable, since some plants present productive and apparent quality characteristics of fruits that make them potential plants matrix. The main pests that attack the fruits of araticum are: Spermologus funereus, Cerconota anonella and Bephratelloides pomorum. The anthropic pressure on natural environments of production of araticum has reduced the current production and can make the future productions impracticable.Item Relação entre a variação genética de caracteres quantitativos e marcadores moleculares em subpopulações de cagaiteira (Eugenia dysenterica DC)(2011-03) Aguiar, Ananda Virginia de; Moura, Nara Fernandes; Moura, Mara Fernandes; Zucchi, Maria Imaculada; Vencovsky, Roland; Chaves, Lázaro JoséThis research aimed to measure the association between molecular diversity and the genetic variation of quantitative traits, estimated from a progeny trial, under controlled conditions. Ten natural subpopulations of cagaita tree from the southeast of Goiás State, Brazil, were investigated. The maternal families were evaluated in a trail using the randomized complete block design with four replications and a single tree per plot. Quantitative data were analyzed estimating the coefficient of heritability (hmi ), on a progeny mean basis and the genetic coefficient of variation (CVgi) for each subpopulation. The traits considered were: plant height and the respective diameter and the corresponding annual rates of increment. Estimates of gene diversity (Hei) and fixation index (fi), available for the same subpopulations, based on isozymes, SSR and RAPD markers, were taken for comparison. Simple linear correlation and multiple regression analysis were used for measuring the association between those estimates on intra and interpopulation level. The weak correlation between gene diversity estimated with codominant and dominant markers reduced the expectation of a good correlation between those statistics and the genetic variation of the quantitative traits. In general, the possibility to infer the magnitude of quantitative variation within subpopulations, based on molecular gene diversity, was not confirmed. RAPD results were more promising, indicating the importance to have an adequate genomic coverage in this kind of research. On the other hand, the interpopulation level, a much better association was detected for all markers. The possibility of predicting quantitative variation based on molecular information was, therefore, not excluded.