Advisor(s)
Abstract(s)
In the future, the use of plant extracts to control phytoplankton growth might be a
promising algal management tool in aquatic ecosystems, dua to its low cost and environmental
safeness. In the present research, effects of aqueous extracts and essential oils from rosemary
(Rosmarinus officinaLis), lavender (Lavandula sp.), poplar (Populus sp.), ash (Fraxinus
angustifofia), laurel (Laurus nobilis), mint (Mentha suavolens) and elder (Sambucus nigra) on the
growth of axenic cultures of Anabaena cylindrica UTAD_ A212 and Chlorella vulgaris CBSC 15-
2075 were screened. Plant species were collected in Bragança region (41°47'.01"N; 6°
45'59.21 "W) during September 2009. Steam distillation of plants was performed to obtain
essential oils and aqueous extracts. Essential oils were tested in 1:1, 1 :3, 1 :4, 1:10, 1 :50
concentrations by disc plate diffusion assay method, against Anabaena and Chiorella growth.
Aqueous extracts were evaluated in batch cultures by testing the effect of 1 :4, 1:7 and 1:1 0
concentrations on algal growth. All the experiments were incubated under optimal conditions.
Present results suggest that essential oils had an algaecide potential in all concentrations, except
rosemary extract in the 1 :50 concentration. Conversely, none of the aqueous extracts had
algaecide potential. However, laurel, rosemary and ash aqueous extracts presented algaestic effect in the concentration of 1 :4. Laurel and rosemary extracts had effect on both algal species,
while ash only had effect on Anabaena growth. Further research to assess the effects of these
plant extracts against other non-target organisms is in course.
Description
Keywords
Plant extracts Algae Algaecide Algaestatic effects
Citation
Monteiro, L.; Geraldes A.M.; Barros, S..; Fernandes, C. (201) - Effects of essential oils and plant extracts of several plant species on the growth of Anabaena cylindrica (Cyanophyta) and Cholorella vulgaris (Cholorophyta). In 2nd IWA Symposium on lake and reservoir management: sustainable approaches to enhance water quality. Granada