水稻化感作用潜力研究初报

Preliminary studies on allelopathic potential in rice

6个化感水稻的化感作用潜力试验结果表明,不同品种水稻的化感潜力存在差异,6个供试水稻按其对稗草生长抑制率的大小依次为“Woo Co Chin Yu”>“Kouketsumuchi”>“AC1423”>“CN-15”>“Taichung Native 1”>“YH-1”。提高化感物质的浓度,可相应增强对稗草生长的抑制作用。试验证实,水稻对稗草的化感作用具有密度依赖效应,表现为杂草密度加大,水稻化感抑制效果降低,这与资源竞争的结果恰好相反。

Experiments of allelopathic potential in six lines of rice indicated that the order inhibiting the barn-yardgrass growth was “Woo Co Chin Yu”>“Kouketsumuchi”>“AC1423”>“CN-15”>“Taichung Native 1”> “YH-1”. Increasing the extract concentrations might cause higher inhibitory effect on the barnyardgrass. It also indicated that the phytotoxicity was density-dependent,showing that the inhibitory effect decreased with the increases of the weed density. Such a result was contrary to the effect of resource competition.