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Distribution of flavonoids and the taxonomy of Huberia (Melastomataceae)

2003; Elsevier BV; Volume: 32; Issue: 1 Linguagem: Inglês

10.1016/j.bse.2003.08.001

1873-2925

Maria Regina Martins Mimura, Antônio Salatino, Maria Luiza Faria Salatino,

Mycorrhizal Fungi and Plant Interactions

Leaves of eight species of Huberia (Melastomataceae) were surveyed for their flavonoid composition. A total of 17 compounds were isolated and identified. Free aglycones and 7-O-glycosides of apigenin and luteolin, as well as free aglycones and 3-O-glycosides of kaempferol and quercetin were found. A flavone C-glycoside was also found, occurring in only one species. All samples yielded the free aglycone of apigenin, but free aglycones of luteolin, kaempferol and quercetin were also obtained. H. consimilis yielded exclusively apigenin derivatives. The degree of infraspecific variation depends on the taxa considered, in certain species (e.g. H. glazioviana) being restricted to substituent sugars and in others (e.g. H. nettoana) also affecting the aglycones. For some species, there seems to be a relationship between flavonoid profiles and geographic distribution of populations. In broad aspects, kinship among species suggested by flavonoid aglycone distribution is only partially congruent with either morphology or n-alkane chemistry. Multivariate analysis suggests links among H. carvalhoi, H. espirito-santensis and H. minor and among H. glazioviana, H. nettoana, H. ovalifolia and H. semiserrata. Links between H. semiserrata and H. nettoana are supported by morphology, n-alkanes and flavonoids.