Nitrate reductase activity in excised embryos of Agrostemma githago increases in response to both NO(3) (-) and cytokinins. We asked the question whether cytokinins affected nitrate reductase activity directly or through NO(3) (-), either by amplifying the effect of low endogenous NO(3) (-) levels, or by making NO(3) (-) available for induction from a metabolically inactive compartment. Nitrate...

Medicinal and aromatic plants with allelopathic effect are a potential source of natural herbicides. The experiment was conducted in order to assess herbicidal meadow sage (Salvia pratensis L.) on germination growth weed species velvetleaf (Abutilon theophrasti Med.) common corn-cockle (Agrostemma githago L.). Water extracts from S. dry biomass different concentrations were evaluated under cont...