为选择适合红小豆的接茬作物，采用室内培养皿生物测定方法，对不同浓度的红小豆根系水提液下红小豆、萝卜、白菜、小麦的化感效应进行了研究。结果表明：红小豆水提液对自身种子发芽率、发芽指数具有极强的化感抑制作用；随着红小豆根系水提液浓度的增大，3 种受体作物的种子发芽率和发芽指数均呈现降低趋势；从幼苗的根长、幼叶长、侧根数、株高及鲜质量等形态指标上来看，只有小麦随着红小豆根系水提液浓度的增大呈现出促进作用，其余2 种受体作物均呈现出抑制作用，但这种抑制作用在低浓度下差异不显著；萝卜、小麦的SOD、POD活性随着红小豆根系水提液浓度的增大而增强，但白菜的2 种酶活性呈现出下降趋势；小麦、萝卜幼苗的MDA含量表现出降低，白菜MDA含量却显著增加。说明受体作物小麦可作为红小豆的轮作作物、萝卜在与红小豆轮作方面也有着很大的应用潜力。
Abstract
For choosing suitable summer-planting adzuki bean crop, this experiment adopted the method of indoor petri dish bioassay to study the allelopathy effect of adzuki bean, radish, cabbage and wheat under different concentrations of adzuki bean root aqueous extracts. The result showed that the adzuki bean had a strong inhibition towards its germination rate and germination index. With the increasing of adzuki bean root aqueous extracts concentration, the seed germination rate and germination index of the three kinds of receptor crops presented a decreasing trend. From the root length, young leaves length, the number of lateral roots, plant height, fresh weight and other forms indicators of seedlings, it was concluded that with the increase of adzuki
bean root aqueous extracts concentration, only wheat presented a promoting effect while the other two kinds of receptor crops show inhibitory effect, which were not significant at low concentrations. With the increase of adzuki bean root extracts concentration, the SOD and POD activity of radish and wheat also increased, but the two kinds of enzyme activity of cabbage showed a decreasing trend. The MDA content in seedlings of radish and wheat decreased, but the MDA content in cabbage increased significantly, which showed that receptor crop wheat could be used as rotation crop of adzuki bean, radish also had a great application potential in adzuki bean crop rotation.
关键词
化感作用；水浸提液；红小豆；萝卜；白菜；小麦
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Key words
allelopathy effect; aqueous extracts; adzuki bean; radish; cabbage; wheat
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