| Solidago canadensis, a long-lived perennial plant native to North America, was initially introduced as an ornamental plant to Shanghai in 1935.It then escaped into the wild and is now spreading rapidly in China, especially in eastern China. The invasion of Solidago canadensis has caused the death of local bush, seriously affecting crop yield and quality. To clarify the success of S. canadensis invasion by analysing allelopathy, biological assays were carried out for the effects of the raw aqueous extracts, ethyl acetate extracts, n-butanol extraction extracts and the water remainder, from S. canadensis leaves on the germination and seedling growth of wheat (Triticum aestivum), Setaria (Setaria viridis) and S. canadensis itself. We tested the four organic fractions to impair germination percentage /rate, vigor, radicle and plumule elongation, and fresh and dry weight kinetics of seedlings. Results are as follows: strong allelopathy did exist in interspecific interactions of S. Canadensis. Among those n-butanol extracts showed the strongest allelopathic effect. The phase of water remainder displayed no significant difference compared to the control treatment. The concentration of 0.5 mg·ml-1 inhibited the seed germination of S. canadensis and the concentration of 5mg·ml-1 significantly inhibited itself seedling growth. The concentration of 1.5 mg·ml-1 n-butanol extract inhibited the germination and seedling growth of wheat. The concentration of 5 mg·ml-1 n-butanol extracts inhibited the germination and seedling growth of Setaria. The allelochemicals were contained mainly in the n-butanol extracts. The self-seed germination and seedling growth were the most sensitive to changes in concentration, while the weeds seedling showed the weakest sensitivity,and thewheat germination showed the weakeast sensitivity.
|
PDF Full Text Request