杂草对不同水稻品种化感作用的诱导效应

以高脚子粳稻、DV86、HG1和扬稻6号4个水稻品种和稗草、异型莎草、鸭舌草为材料，研究了不同水稻品种单栽或与杂草共栽时，水稻叶片水浸提液对稻田主要杂草稗草的化感作用。结果表明：在正常单栽条件下，高脚子粳稻抗稗草的化感潜力显著大于：HG1和DV86，三者的化感潜力均显著大于非化感品种扬稻6号。不同水稻品种与杂草共栽时，其化感作用均由不同程度的变化，HG1在与稗草共栽时，对稗草幼苗的生长抑制作用显著大于高脚子粳稻；DV86在与鸭舌草共栽时，对稗草幼苗的生长抑制最强。研究表明不同杂草对不同水稻品种的杂草化感作用的诱导效应存在显著差异。

Induction effect of some weeds on the allelopathy of rice varieties

Induction on the allelopathy in four rice varieties were analyzed with three weed species [barnyardgrass (Echinochloa crusgalli L.), flatsedge (Cyperus difformis), ducksalad (Monochoria vaginalis Burm.f)]. The results showed that the allelopathic potential of Gaojiaozijingdao, HG1 and DV86 were significantly larger than that of Yangdao No.6 under the weed control. When rice was co-grown with the weeds the inhibiting effects of allelopathic rice varieties on barnyardgrass (Echinochloa crusgalli L.) was significantly changed. When grown with barnyardgrass HG1 had the highest inhibiting effect on the weed, even significantly higher than that of Gaojiaozijingdao, which had stronger allelopathy under the weed control. When cultivated with ducksalad (Monochoria vaginalis Burm.f), DV86 showed strongest allelopathic potential on barnyardgrass. It suggested that weed species could induce the allelopathic potential in rice, and this induction might be specific among weed species and rice varieties.