TITLE:
Tree Crown Variation and Seasonal in the Phenolic Compounds Content of Stryphnodendron adstringens (Mart) Coville Leaves
AUTHORS:
Alessandra de Oliveira Ribeiro, Selma Lopes Goulart, Fábio Akira Mori, Ana Hortência Fonseca Castro
KEYWORDS:
Barbatimão, Tannins, Leaves, Seasonal Variation, Cerrado
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.5 No.19,
September
19,
2014
ABSTRACT: The aim of this study was to compare phenolic compounds contents between
different positions within the crown and between collection periods, and to
evaluate the tannin contents by the Folin-Ciocalteu method. The collections
were performed in Lavras, in the southern region of the Brazilian state Minas
Gerais. The experiment was conducted in a completely randomized design (factorial
3 × 4); the first
factor being the position (base, middle, top); and the months, the second factor
(February, May, September and December). We verified that the leaves of S. adstringens present higher total
phenolic and tannin contents at the top (23.05% and 18.23%) and base (21.42%
and 16.61%) of the crown, in May (25.79% and 20.85%) and September (25.57% and
20.50%), respectively. There was no difference in the residual phenol and
flavonoid contents between the positions within the crown or in the months of
collection. These facts suggest that within the crown and climatic changes may
be one of the factors affecting phenol levels in Stryphnodendron adstringens.