科研之友
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摘要
Brassicacea members camelina (Camelina sativa) and canola (Brassica napus) were examined for allelopathic activity against wild oat (Avena fatua), flax (Linum usitatissimum), and radish (Raphanus sativus). This 4-part study investigated the effects of leaf washings, aqueous extracts, soil incorporated fresh plant residues and root exudates on seedling weight. The effects of aqueous extracts on germination were also quantified. Camelina and canola leaf washings increased radish seedling weight, while only canola increased flax weight. Where effects were observed, aqueous extracts of camelina and canola reduced the germination of wild oat, flax and radish. Wild oat and radish seedlings had reduced root weight and increased shoot weight in response to aqueous extracts. Incorporation of camelina or canola fresh plant residues into growth media increased radish weight, while only canola residues increased wild oat biomass. Canola root exudates decreased wild oat weight, but increased radish weight. Camelina exudates decreased flax weight. Aqueous extracts predominantly contained volatile sulfur containing compounds (methanethiol, dimethyl sulfide, dimethyl disulfide and dimethyl trisulfide) as potential allelochemicals. Further research will focus on confirming the allelopathic activity of candidate allelochemicals. Variable results between the different assays and the species investigated reflect the challenges of identifying a true allelopathic interaction between species and the need for rigorous and multi-part analyses, requiring subsequent confirmation in an ecological context.
- 出版日期2014-1
