摘要： 为解决农药在西芹生产中的残留与污染问题,采用生长速率法研究了西芹根及根际区物乙醇浸提液对黄瓜枯萎病菌的化感作用。结果表明,西芹根乙醇浸提液在所试浓度范围内对黄瓜枯萎病菌有不同程度的化感抑制作用,其抑制率最高达42.31%,最低为12.22%;除了1%浓度的处理在作用时间为120,132 h时菌落直径与对照(CK)无显著差异外,其余各浓度处理在不同作用时间对黄瓜枯萎病菌都有显著或极显著的化感抑制作用。西芹根际区物乙醇浸提液在较高浓度时(RS100%到RS60%)对黄瓜枯萎病菌表现出强的化感抑制作用,且浓度越高,抑制效果也越好,最高抑制率达94.37%,比相应的非根际土壤浸提液的高出49.02百分点;在较低浓度时(RS40%,RS20%)对供试病原菌表现为弱的化感促进作用,但明显小于与之相对应的非根际土壤浸提液的促进作用。乙醇浸提液对黄瓜枯萎病菌的化感抑制效果有随着浓度的降低和作用时间的增加而逐渐减弱的趋势。

关键词: 西芹根, 根际区物, 乙醇浸提液, 黄瓜枯萎病菌, 化感作用

Abstract: In the study, the allelopathy of the ethanol extract of the root of parsley on Fusarium oxysporiumf. sp. cuc- umeris was studied by growth rate method.The result showed that the ethanol extract of the root of parsley inhibited the growth of Fusarium oxysporiumf. sp. cucumeris significantly within the range of experimental concentration except the con - centration of 1% in 120 and 132 h, and its highest inhibitory rate was 42.31%,or lowest rate was 12.22%;the ethanol extract of the rhizosporic soil of parsley inhibited the growth of Fusarium oxysporiumf. sp. cucumeris significantly at higher concentrations( from RS100% to RS60% ), and the largest inhibitory rate was 94.3%.The higher concentration, the bet - ter allelopathic effect, whichwas more than that of corresponding extract of the nonrhizosphere, adding up to 49.02%; the lower concentration( RS40% and RS20%) of the ethanol extract of the rhizosperic soil of parsley promoted the mycelial growth lightly, but whichwas less than that of corresponding extract of the nonrhizosphere obviously.There was a tendency that inhibitory rate of ethanol extract of root agaist Fusarium oxysporiumf.sp. cucumeris dropped down with decreasing concentration and prolong time.

Key words: The root of parsley, Rhizosperic substance, Ethanol extract, Fusarium oxysporiumf. sp. cucumeris, A- llelopathy

中图分类号: 

• S436.421.13

• S636.3