Allelopathic effects of different essential oils on seed germination of stinging nettle (Urtica dioica L.) and purslane (Portulaca oleracea L.)
Makaleler > Tam Makale · 2026
Yazarlar: Merve GÖRE AKYÜZ, Filiz Kılıç, Ayşe Betül AVCI, Zeynep Cıyrık
ANADOLU JOURNAL OF AGRICULTURAL SCIENCES, Uluslararası, 2026, cilt 41
DOI: 10.7161/omuanajas.1906084
Özet
This study investigated the allelopathic effects of eight essential oils (oregano, lavender, bay leaf, rosemary, lemon, orange, sage and myrtle) on seed germination of stinging nettle (Urtica dioica L.) and purslane (Portulaca oleracea L.). Essential oils were applied by micropipette at 2000, 3500 and 5000 ppm onto filter paper in Petri dishes (20 seeds, 3 replicates) and incubated at 25°C in complete darkness for 28 days. Germination count, germination percentage (GP%) and germination index (GI) were recorded; data were analysed by one-way and two-way ANOVA with Tukey’s HSD test. Oil type exerted a highly significant effect in both species (stinging nettle: F(7,48) = 169.067, p < 0.001; purslane: F(7,48) = 67.532, p < 0.001), while the concentration main effect was non-significant. A significant oil × concentration interaction was detected in purslane (F(14,48) = 2.196, p = 0.022). Oregano oil fully inhibited germination at all concentrations in both species (GP = 0%, GI = 0). Sage oil reduced purslane germination in a dose-dependent manner (GP = 20% at 5000 ppm), and myrtle oil showed a similar inhibitory profile at 3500–5000 ppm. The remaining five oils showed no statistically significant inhibitory effect in either species. These results indicate that oregano oil is the strongest bioherbicide candidate among those tested, and that purslane is more broadly sensitive than stinging nettle, likely reflecting differences in seed morphology.