ANTIBACTERIAL ACTIVITY OF EXTRACTS FROM NATIVE SPECIES OF Schinus

TERAN BAPTISTA, Z.P.; SAMPIETRO, D.A.; AREDES FERNANDEZ, P.A.; VATTUONE, M. A.; CATALAN, C.A.N.

Tucuman

Congreso; THIRD JOINT MEETING OF THE BIOLOGY SOCIETIES OF ARGENTINA; 2015

Sociedades Argentinas de Microbiologia

Bacterial diseases cause important economical crop losses every year, whose impact is only surpassed by fungal diseases. There is a narrow spectra of plant protectans able to control phytopathogenic bacteria. The aim of this work was to investigate the antibacterial activity of aerial parts from native plants of Schinus. Sequential extraction of leaves and stems from S. fasciculatus and S. gracilipes were extracted with dichloromethane, ethyl acetate and methanol, yielding fCH2Cl2, fAcet and fMeOH fractions, respectively. The antibacterial activity of the latter was evaluated by a microdilution method using Mueller-Hinton medium on Pseudomonas corrugata,P. syringae, Xanthomonas campestris, Erwinia carotovora and Agrobacterium tumefaciens. The concentration needed to inhibit 50% of bacterial growth (CI50) was calculated by probit analysis. fAcet fractions from leaves and stems of S. fasciculatus were active against Pseudomonas syringae, X. campestris and A. tumefaciens (IC50: 800-1500ppm). The growth of P. corrugata, E. carotovora, X. campestris and A. tumefaciens was inhibited by fAcet (IC50: 1200-1700ppm) and fMeOH fractions (IC50: I700-1000 ppm) of S. gracilipes. The Schinus species seem to contain antibacterial compounds of high and intermediate polarity, which will be isolated and identified