Common oat grayn germination in aqueous extracts of heracleum sosnowskyi leaves.
The plant residues of the Sosnowsky's hogweed (Heracleum sosnowskyi Manden.), an invasive species, have a strong allelopathic effect. The paper presents data on the influence of H. sosnowskyi leaf aqueous extract extract (10%, prepared in 10 g dry weight : 100 ml distilled water) and its dilute solutions (5, 2, 1 and 0.5% concentrations) on seedling oat germination rates. Control - distilled water. Sosnowsky's hogweed leaf extract (10%) significantly inhibited oat grain germination, which was 69.3% and was 21.5 relative units lower than in the control. The extract most inhibited the germination intensity of the grains. After 72 hours of germination, it was barely 38.7 percent. The effect of the extract and dilute solutions on the length of the coleoptiles was not significant except for the 2% concentration solution. In it, the coleoptiles were 1.08 times longer than in the control. The solution at this concentration promoted the growth of roots and the intensity of their formation. The roots were insignificantly 1.07 times longer and formed on average 1.12 times significantly more than in the control. However, a 2% concentration solution inhibited root fibrilla formation, with an area of 34.12% of the root lenght. Substantially the shortest roots (8.7 cm) and the lowest (1.10) root/coleoptile lenght ratio, or RCR, were determined by germination at 10% in the extract. The highest RCR (1.57), root area (51.26%) and vigor index (1847.56) were in the control.