Allelopathy Journal

The effect of salinity on allelopathic potential of canola (Brassica napus L. cv Hyola 401) was studied with aqueous extract of canola grown in saline (EC=6 and EC=10 dS/m) and non-saline (EC=0 dS/m) soils on soybean (Glycine max L. cv Gorgan 3) germination, radicle length, some organic compounds, catalase and peroxidase activity. Aqueous extracts of canola grown on soils with EC=6 and EC=10 dS/m decreased the germination, radicle growth, total protein, proline contents and catalase and peroxidase activity. While extracts with EC=0 dS/m, increased the soluble sugars and phenolic compounds increased in seedlings. In soybean grown in Hoagland solution, these extractions also reduced peroxidase and catalase activity in root, stem and cotyledon. Thus salinity increased the allelopathic potential in canola through the accumulation of phenols as antioxidants.