禾谷镰刀菌粗毒素对不同抗性水平小麦品种细胞膜透性的影响

The Effect of Fusarium graminearum Crude Toxin on Membrane Permeability of Wheat Varieties

本实验以抗、感基因型不同的6个小麦品种(系)为材料,系统研究了不同浓度的禾谷镰刀菌粗毒素胁迫处理下小麦品种(系)细胞膜透性随处理时间变化的特性。结果表明:抗、感小麦品种(系)细胞膜对外界毒素胁迫表现出敏感特性,且抗性品种(系)细胞膜对毒素的敏感性小于感病品种(系)。在毒素胁迫处理72h内,随毒素处理浓度的增大和胁迫处理时间的延长,细胞膜透性增大,抗病小麦品种(系)的膜透性增量明显小于感病品种(系)。胁迫处理72h抗、感小麦品种(系)的膜透性增量达到峰值,抗病品种(系)膜透性增量显著小于感病品种(系) ,胁迫处理72h后抗、感小麦品种(系)的膜透性增量均降低。可利用禾谷镰刀菌粗毒素胁迫处理72h的细胞膜透性增量评价小麦品种间抗病性的差异,进行抗病性鉴定。

Responses of permeability in six wheat varieties to Fusarium grarninearurn crude toxin were studied under different stress time and different toxin concentration. The results showed that root cell membranes were all susceptible in 72 hours＇ toxin stress. Relative electric conductivity increased with the increasing of toxin concentration and the elongation of toxin stress time. Resistant varieties had stronger resistance to toxin stress than susceptible varieties and increment of relative electric conductivity were lowest. The increment of membrane permeability was all highest after 72 hours＇ stress and showed significant difference. Then the increment of membrane permeability of resistant varieties decreased.