Screening of Nasturtium officinale Extracts for Biological Activities: Implications for Plant Pathogens
2014
Iseri, Özlem Darcansoy | Aksoy Körpe, Didem | Sahin, Feride Iffet | Haberal, Mehmet
Nasturtium officinale (Brassicaceae) is a succulent, rhizomatous perennial aquatic weed, and naturally found in Turkey. The aim of the present study was to screen biological activity of leaf (L), root (R), and seed extracts (S). Extracts were prepared using methanol (MetOH) and water (dw). Total phenol contents were; Ldw>LMetOH>SMetOH>RMetOH>Sdw>Rdw. DPPH· scavenging activities were; Ldw>LMetOH>SMetOH>Rdw>RMetOH>Sdw. Extracts were tested on 11 food-borne and 5 plant-borne strains for antibacterial activity which were; LMetOH(15/16)>RMetOH(3/16)>L-Rdw (2/16)>SMetOH-dw (1/16). All strains tested were susceptible to LMetOH (7.6 <I Z < 12.3 mm) except for the Pseudomonas aeruginosa . Highest activity was against Klebsiella pneumoniae and Shigella spp. (MIC: 1024 µg.mL-1). Listeria monocytogenes was also susceptible to RMetOH and Rdw (MIC: 2048 µg.mL-1). LMetOH, RMetOH, and Rdw had high antibacterial activity against Xanthomonas vesicatoria , with MIC of 256 and 512 µg.mL-1, respectively. LMetOH was also effective against Pseudomonas tomato and Erwinia caratovora (MIC: 1024 µg.mL-1) . Considering eco-safety and effectiveness, antibacterial activities of plant extracts would be important in phytopathogen control.
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