Allelopathic activity and chemical analysis of crude extracts from the macrophyte Egeria densa on selected phytoplankton species
Por:
Alberto Espinosa-Rodriguez, Cristian, Valencia-Del Toro, Gustavo, Sarma, S. S. S., Nandini, S.
Publicada:
1 ene 2016
Resumen:
Egeria densa is an invasive macrophyte in Mexico and its allelopathic
effects on phytoplankton species are poorly documented. Hence, we
evaluated the inhibitory effects of different concentrations of crude
extracts (hexane, ethyl acetate and methanol) from E. densa on
Scenedesmus acutus, Chlorella vulgaris, Monoraphidium sp. and Nitzschia
palea. The hexane extracts yielded less quantity of crude extract, while
methanol resulted in higher amount. We detected 9-compounds, of which
saponins, tannins, cardiac glycosides and phenols were most abundant.
Agar diffusion in disc bioassays showed inhibition halos of different
sizes depending on the extract, concentration, solvent type used and the
tested phytoplankton species. In C. vulgaris and S. acutus, the
inhibition halos of >20 mm diameter were observed in treatments
containing ethyl acetate and methanol extracts. The results suggested
that E. densa contained substances that could change the composition of
phytoplankton communities through their inhibitory and/or allelopathic
effects.
Filiaciones:
Alberto Espinosa-Rodriguez, Cristian:
Univ Nacl Autonoma Mexico, Posgrado Ciencias Mar & Limnol, Ciudad Univ,Av Univ 3000, Mexico City 04510, DF, Mexico
Valencia-Del Toro, Gustavo:
Univ Nacl Autonoma Mexico, Posgrado Ciencias Mar & Limnol, Ciudad Univ,Av Univ 3000, Mexico City 04510, DF, Mexico
UPIBI, Inst Politecn Nacl, Lab Bioconversiones, Av Acueducto S-N, Mexico City 07340, DF, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Posgrado Ciencias Mar & Limnol, Ciudad Univ,Av Univ 3000, Mexico City 04510, DF, Mexico
Nandini, S.:
Univ Nacl Autonoma Mexico, Posgrado Ciencias Mar & Limnol, Ciudad Univ,Av Univ 3000, Mexico City 04510, DF, Mexico
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Div Invest & Posgrado, Campus Iztacala,Av Barrios 1, Tlalnepantla 54090, Eco De Mex, Mexico
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