不同水肥和光照条件对水稻化感特性的影响

采用盆栽实验对水稻化感品种华航1号在不同水肥和光照条件下的化感潜力和化感物质进行了研究。结果表明，华航1号在较高水肥条件下化感潜力较强，而在较低水肥条件下化感潜力下降，进一步对华航1号的化感特征物质的含量测定表明，在较低水肥条件下其化感物质没有显著的变化，只是次生物质的种类有所增加，尤其是一些具有抗病功能的次生物质的含量有所增加，在弱光照条件下华航1号的化感特征物质含量比在较强光照条件下要低，而且具有抗病功能的次生物质含量则保持较高水平，结果还发现，不论水、肥或光照条件的变化，华航1号对非伴生杂草的化感潜力都比伴生杂草要强。

Effects of different water|fertility|and light conditions On allelopathic traits of rice

The allelochemicals and allelopathic potentials of rice (Huahang No.1) were investigated under different water,fertility,and light conditions with pot culture. The results showed that the allelopathic potential of Huahang No.1 was stronger at high levels of water and fertility,but its specific allelochemicals contents had no significant variation at both levels. The numbers of the total secondary metabolites and the contents of some anti pathogenic chemicals were increased at low level of water or fertility. Furthermore,the contents of specific allelochemicals in Huahang No.1 were lower under strong light than under weak light condition. Similarity,the allelopathic potential decreased,and the contents of some anti pathogenic chemicals maintained unchanged under weak light condition. No matter what levels of water,fertility or light conditions were,the allelopathic potential of Huahang No. 1 on associated weeds was weaker than that on non associated ones.