不同类型稻种资源对稗草化感潜力差异评价

以120份不同类型稻种资源为研究对象,将田间鉴定和室内叶浸提液处理鉴定方法相结合,对其化感作用差异进行了鉴定评价.结果表明,在田间不同类型稻种资源对稗草生长的抑制效果大小趋势为地方品种＞选育品种(系)＞引进品种(系)＞杂交水稻(恢复系和不育系),对稗草苗鲜重和苗干重的抑制效果大于对苗高的抑制效果.室内叶浸提液处理鉴定结果,不同类型稻种资源间化感作用差异相对较小,但仍以地方品种较强,并对稗草根长的抑制效果大于对稗草苗高的抑制效果.地方品种中具有较强化感作用的种质资源频率高于其他类型品种,今后要加强对地方品种资源的化感潜力鉴定和评价.

Evaluation of Allelopathic Potential for Different Type of Rice Germplasm on Barnyardgrass

The difference of allelpphthic effect for 120 accessions of different rice germplasm on barnyardgrass were evaluated by using field test and treatment of leaf extracts.The result showed that there were significantly difference of allelopathic effect potential among rice germplasm groups,especially under the field conditions.The order of control effect on barnyardgrass growth was traditional variety>improved variety>introduced foreign variety>hybrid rice,and the value of relative factors of allelpphthic effect on seedling fresh weight and seedling dry weight of barnyardgrass was larger than that of relative factors of seedling height.According to the result of leaves water extract experiment in lab,the control effect of traditional variety on barnyardgrass growth was stronger,although the difference of allelpphthic effect were smaller among rice germplasm groups,and control effect on root length of barnyardgrass was bigger than that on seedling height.The frequency of higher allelopathic varieties in traditional variety was higher than that of other germplasm groups.Therefor it is very important to evaluate the allelpphthic effect of traditional variety in the future.