Variabilidade química dos óleos essenciais e do teor de fenóis em folhas e frutos da jabuticabeira (Myrciaria cauliflora)
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Data
2012-06-29
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Universidade Federal de Goiás
Resumo
Foliar contents of total phenols and tannins and the essential oil composition of Myrciaria
cauliflora populations cultivated in six sampling sites have shown the presence of four
clusters related to soil types and foliar nutrients. Cluster I included samples which
originated from sandy soil (S1) with the highest and lowest percentages of γ-eudesmol
(11.55%) and germacrene D (20.48%), respectively, as well as high total phenol (136.68
mg/g) and tannin (60.72 mg/g) contents. Cluster II, rich in elemol (4.61%), included all
the samples cultivated from clay sand loam soils (S2, S3, and S6), whereas clay soils S4
(cluster III) and S5 (cluster IV) had the highest amounts of germacrene D (III: 27.20%;
IV: 26.83%) and the lowest levels of elemol (2.12%; 2.55%), total phenols (79.69 and
111.77 mg/g), and tannins (34.04 and 44.51 mg/g). Canonical redundancy analysis
(RDA) revealed the relationship between chemical balances in the soil and leaf nutrients
in different clusters. Chemovariations may be environmentally determined. Additionally,
essential oil chemical composition and phenolics (total phenols, tannins, anthocyanins),
reducing sugar and fruit acidity contents of Myrciaria cauliflora were obtained from same
cultivated populations. RDA and discriminant analyses revealed four clusters of samples
based on contents of α-copaene, tannins, reducing sugar and fruit acidity as predictor
variables. The total variation partition performed by partial RDAs showed a strong
influence of edaphic factors on phenolics, reducing sugar and fruit acidity data set.
However, the polymorphism of essential oils may be genetically determined. Spatial
influence on chemovariations was significant for all constituents, but less pronounced for
essential oil data.
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DUARTE, Alessandra Rodrigues. Chemical variability of essential oils and phenol content in leaves and fruits of jabuticabeira (Myrciaria cauliflora). 2012. 83 f. Tese (Doutorado em Ciencias Exatas e da Terra) - Universidade Federal de Goiás, Goiânia, 2012.