Antimicrobial Activity of Palustriella commutata (Hedw.) Ochyra Extracts (Bryophyta)

The present study describes the antimicrobial activity of 2 extracts of Palustriella commutata (Hedw.) Ochyra, collected from the Sundiken Mountains, Eskiflehir, Turkey. These extracts were first prepared with acetone and methanol solvents under reflux. The antimicrobial activity of the extracts was then assessed using the disc diffusion method against 11 bacteria, 1 yeast, and 8 moulds. The antimicrobial test results revealed that the acetone extract had a potential activity against 9 test bacteria. While some gram-positive bacteria tested were sensitive (Bacillus mycoides, B. cereus, B. subtilis, and Micrococcus luteus), all gram-negative bacteria tested (Klebsiella pneumoniae, Yersinia enterocolitica, Pseudomonas aeruginosa, Escherichia coli, and Enterobacter aerogenes) were sensitive to the acetone extract. Both extracts were inactive against yeast and mould strains. The results presented in this paper suggest the possibility that P. commutata possesses a new antimicrobial compound that has an effect against gram- negative and gram-positive bacteria. Palustriella commutata (Hedw.) Ochyra (Bryophyta) Ekstrakt›n›n Antimikrobiyal Aktivitesi Ozet: Bu cal›flma Eskiflehir (Turkiye) Sundiken dalar›ndan toplanan Palustriella commutata (Hedw.) Ochyra ekstraktlar›n›n antimikrobiyal aktivitesi uzerinedir. Ekstraktlar aseton ve metanol cozuculeriyle refluks alt›nda haz›rlanm›flt›r. Ektraktlar›n antimikrobiyal aktivitesi onbir bakteri, bir maya ve sekiz kufe karfl› disk difuzyon yontemi kullan›larak deerlendirilmifltir. Antimikrobiyal test sonuclar› aseton ekstrakt›n›n test bakterilerine karfl› potansiyel bir aktiviteye sahip olduunu gostermifltir. Denenen gram-pozitif bakterilerden baz›lar› (Bacillus mycoides, B. cereus, B. subtilis ve Micrococcus luteus) aseton ekstrakt›na duyarl› iken, gram-negatif bakterilerin (Klebsiella pneumoniae, Yersinia enterocolitica, Pseudomonas aeruginosa, Escherichia coli ve Enterobacter aerogenes) hepsi duyarl›yd›. Her iki ekstrakt maya ve kuf sufllar›na karfl› inaktifti. Elde edilen bulgular P. commutata' n›n gram-negatif ve gram-pozitif bakterilere karfl› etkili olan yeni bir antimikrobiyal bileflie sahip olma olas›l›¤›n› ileri surmektedir.