科研之友
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摘要
Suspected allelopathic activity of swine-cress (Coronopus didymus L.) was evaluated based on germination and early seedling growth of wheat (Triticum aestivum L.) in a laboratory bioassay. Aqueous root, leaf and whole plant extracts of swine-cress were applied at 0, 2.5, 5.0, 7.5 and 10% (w/v). Results revealed significant inhibition of germination and seedling growth of wheat for all extract sources and concentrations. Variable phytotoxicity was exhibited by different extract sources and leaf extract caused the greatest inhibition. Nonetheless, the degree of inhibition increased in a concentration dependent manner for all extract sources. Compared to the control all treatments increased the time to 50% germination, and mean germination time, with corresponding decreases in germination index and final germination percentage of wheat. Higher (10%) concentration of root, leaf and whole plant extracts reduced final germination by 36, 59 and 39%, respectively. Leaf extract caused more inhibition of wheat shoot length, root length and dry biomass than other extracts. Wheat seedling dry biomass was inhibited 73% by leaf extract, 65% by whole plant extract and 12% by root extract at 10% concentration. All extracts reduced chlorophyll contents and increased phenolics in wheat seedlings. The results suggest that the inhibitory allelopathic activity of swine-cress against germination and seedling growth of wheat should be explored under field conditions.
- 出版日期2013
