Allelopathic Effect of Aqueous Extract of Hot Pepper Plant on Four Vegetables Seed Germination

The effects of aqueous extracts from different parts of hot pepper were determined by means of bioassay in laboratory. The results showed that the seed germination of Chinese cabbage and radish was improved by aqueous extract of whole hot pepper plant when its concentration was 0.01 g/mL, and the seed germination of radish was improved by aqueous extract of root of hot pepper when its concentration was 0.01 g/mL,but the seed germination of four kinds of vegetable was inhibited by aqueous extracts from whole plant, root, stem and leaf of hot pepper when the concentration were 0.02 g/mL or higher than 0.02 g/mL.With increasing concentration of aqueous extracts, the inhibiting effects on vegetable seed germination expressed strong. The allelopathical effect order of aqueous extracts from different parts of hop pepper on seed germination of four kinds was leafstemplantroot. The seed germination of tomato and chinese cabbage were sensitive to hot pepper's allelochemicals, but radish and cucumber were not.