Caracterização fenotípica e variação genética quantitativa em Dipteryx alata Vog. (Barueiro) do cerrado
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2013-03-27
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Universidade Federal de Goiás
Resumo
The Cerrado biome is the second largest in Brazil, occupying 23% of the national territory, has
several vegetation types, and has the richest flora among the world's savannas. The baru tree, due
to its wide geographic distribution, is a species with the ability to display high levels of genetic
diversity, thus providing the ability to occupy different habitats. The species in question has a
multitude of uses, constituting a key species for studying domestication and cultivation. This study
aimed to obtain information about the patterns of phenotypic variation for some traits of fruits,
seeds and seedlings of baru and to estimate the genotic variability among and within 25 natural
subpopulations of Dipteryx alata Vog., based on quantitative data. Fruits were collected from
plants of 25 regions in the Cerrado biome, sampling six plants per subpopulation and, at least, 25
fruits per plant. The data were submitted to descriptive analysis, analysis of variance and
correlation between traits. There was significant variation for all variables at all levels evaluated;
among fruits within plants, among plants within subpopulations and among subpopulations for the
fruits and seed traits evaluated. There was variation among progeny within subpopulations and
among subpopulations for initial and final height, number of leaves, total leaf size, number of
internodes and root length of seedlings. A greater proportion of variability was observed between
plants within subpopulations. Correlation analysis demonstrated significant correlations for most
pairs of characters of fruit evaluated at different hierarchical levels. The heritability found for final
height, fresh weight and dry weight of shoots indicates possibility of gains from selection for these
characters.
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MOTA, E. E. S. Caracterização fenotípica e variação genética quantitativa em Dipteryx alata Vog. (Barueiro) do cerrado. 2013. 84 f. Dissertação (Mestrado em Genética e Melhoramento de Plantas) - Universidade Federal de Goiás, Goiânia, 2013.