化感水稻不同组织水浸提液对稗草的化感作用

本研究利用HG1和HG2两个化感水稻品种和稗草为材料，研究了化感水稻品种的叶、叶鞘、根组织的水浸提液对稗草幼苗的化感作用。结果表明：HG1不论是对稗草幼苗的株高还是对稗草幼苗的根都有极强的化感作用，而HG2只对稗草的根有极强的化感作用。在不同组织之间，叶和叶鞘的水浸提液对稗草的抑制作用显著大于根的水浸提液和对照。两个化感水稻对稗草幼苗根的抑制更强于对苗高的抑制。随着稗草密度的增加，稗草受抑程度减少，这可能与单株吸收化感物质的量减少有关。

Allelopathic Effects of Aqueous Extract from Rice on the Growth of Barnyardgrass

The effects of aqueous extract from the sheath, leaf and root of two rice materials (HG1 and HG2) on the growth of barnyardgrass were studied. The results showed that HG1 had strong allelopathic effects on the growth of roots and seedling of barnyardgrass, while HG2 only on the growth of roots. Leaf and sheath extracts had more significant inhibitory effects on the growth of barnyardgrass than root extract and distilled water. Root growth of barnyardgrass was significantly inhibited by aqueous extract of root, sheath and leaf of rice. The inhibiting effects on barnyardgrass were negatively relevant to barnyardgrass density, which might be induced by the decreasing amount of individual-absorbing allelochemical.