High-antibacterial activity of Urtica spp. seed extracts on food and plant pathogenic bacteria.
The aim of this study was to comparatively evaluate antibacterial activities of methanol (MetOH) and aqueous (dw) leaf (L), root (R) and seed (S) extracts of Urtica dioica L. (Ud; stinging nettle) and Urtica pilulifera L. (Up; Roman nettle) on both food- and plant-borne pathogens, with total phenolic contents and DPPH radical scavenging activities (DRSA). MetOH extracts of leaves and roots of U. dioica had the highest DRSA. Extracts with high antibacterial activity were in the order Up-LMetOH (13/16) > Ud-SMetOH (11/16) > Up-SMetOH (9/16). Results obtained with Up-SMetOH against food spoiling Bacillus pumilus, Shigella spp. and Enterococcus gallinarum with minimum inhibitory concentrations (MICs) in 128-1024 μg/ml range seem to be promising. Up-SMetOH also exerted strong inhibition against Clavibacter michiganensis with a considerably low MIC (32 μg/ml). Ud-SMetOH and Up-LMetOH were also effective against C. michiganensis (MIC = 256 and 1024 μg/ml, respectively). Ud-SMetOH and Ud-RMetOH had also antimicrobial activity against Xanthomonas vesicatoria (MIC = 512 and 1024 μg/ml, respectively). Results presented here demonstrate high-antibacterial activity of U. pilulifera extracts and U. dioica seed extract against phytopathogens for the first time, and provide the most comprehensive data on the antibacterial activity screening of U. pilulifera against food-borne pathogens. Considering limitations in plant disease control, antibacterial activities of these extracts would be of agricultural importance.
Institute of Transplantation and Gene Sciences, Baskent University, 06980 Ankara, Turkey.
Didem Aksoy
DA
Körpe
Özlem Darcansoy
ÖD
İşerı
Feride Iffet
FI
Sahin
Evren
E
Cabi
Mehmet
M
Haberal
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects*; D005516:Food Microbiology; D006801:Humans; D008826:Microbial Sensitivity Tests; D010935:Plant Diseases / Q000382:microbiology* / Q000628:therapy; D010936:Plant Extracts / Q000494:pharmacology*; D018515:Plant Leaves; D018517:Plant Roots; D012639:Seeds; D026982:Urtica dioica; D027003:Urticaceae
D000900:Anti-Bacterial Agents; D000975:Antioxidants; D010936:Plant Extracts