Abstract
The study examined the total phenol and tannin contents in stem bark and leaf tissues of the medicinal species Cenostigma microphyllum (Mart ex. G. Don) E. Gagnon & G. P. Lewis distributed under different rainfall amounts and soil fertility levels in the Caatinga, the largest nucleus of Seasonally Dry Tropical Forest and Woodlands in the Neotropics. Using colorimetric method (Folin–Ciocalteu to total phenol content and casein precipitation to total tannin content), it was shown that both phenol and tannin content was significantly higher in the leaves than in the stem bark. Soil fertility affected negatively only the total phenol content. No relationship was observed between rainfall and compounds, and between soil fertility and total tannin content. Thus, our findings indicate that although water-deficit stress is a limiting factor in arid and semi-arid regions, soil fertility is also an abiotic factor that affect the production of phenolic compounds. Moreover, the concentration of such metabolites changes according to the class of compound and plant tissue analyzed.
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