马铃薯晚疫病菌的生物防治及寄主抗性机制的研究
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摘要
本试验测定了木霉T115D发酵滤液对马铃薯晚疫病生物防治,为开发新型防治马铃薯晚疫病的生物农药奠定基础。本试验通过对抗病品种克18、克16,感病品种尤金、东农303接种和未接种处理后,研究叶片中总酚、类黄酮、绿原酸、可溶性糖、可溶性蛋白、木质素等物质的变化规律及POD、PPO、PAL、CAT、α-淀粉酶、蔗糖酶、几丁质酶和β-1,3-葡聚糖酶等相关酶的活性变化,探讨其与马铃薯品种抗病性的关系。
     1.测定了木霉T115D发酵滤液对马铃薯晚疫病菌的抑制作用,发酵滤液对菌丝有抑制作用但不明显;发酵滤液对晚疫病菌孢子囊释放游动孢子,游动孢子萌发,孢子囊萌发有明显的抑制作用。其浓度100%的发酵滤液对晚疫病菌孢子囊释放游动孢子的相对抑制率分别为75%,对游动孢子萌发的相对抑制率为60.02%,对孢子囊萌发的相对抑制率为57.60%。提前一天接种发酵液的防治效果最好,防治效果达79.4%。
     2.采用火棉胶法和水合氯醛法对马铃薯不同抗性品种茸毛和气孔进行观察,发现抗病品种的茸毛数大于感病品种,气孔数小于感病品种,茸毛数和气孔数与品种的抗病性有关。
     3.利用分光光度计法测定不同抗性品种的马铃薯接种和未接种处理下叶片酚类物质的含量。结果表明,接种后抗病品种总酚、类黄酮、绿原酸含量均高于感病品种,未接种处理下抗病品种总酚、绿原酸含量高于感病品种。利用滴定法测定不同抗性品种的马铃薯叶片接种和未接种处理下木质素的含量,未接种处理下抗病品种木质素含量略高于感病品种,接种后,抗感品种木质素含量也高于感病品种。
     5.利用分光光度计法测定不同抗性品种的马铃薯接种和未接种处理下叶片防御酶活性的变化。接种后,抗病品种的PPO、POD、PAL、CAT、几丁质酶和β-1,3-葡聚糖酶的活性高于感病品种,未接种处理下,抗病品种的PPO、POD、CAT、几丁质酶和β-1,3-葡聚糖酶的活性高于感病品种。
     6.未接种处理下抗病品种叶片中可溶性糖、可溶性蛋白、α-淀粉酶、蔗糖酶含量略高于感病品种,接种后,抗感病品种中可溶性糖、可溶性蛋白、α-淀粉酶、蔗糖酶含量均增加,随着接种时间延长,抗感病品种间差异变大。
Biological control of fermentation filtrate of Trichoderma T115D on potato late blight in this experiment,Laid a foundation for develop new biological pesticide to control potato late blight.By inoculation with resistant variety of kexin18、kexin16 and susceptible bariety youjindongnong -303.Study on the activity changes of total phenols,flavonoids,chlorogenic acid soluble sugar,soluble protein,lignin and POD,PPO,PAL,CAT,α- amylase,invertase,chitinase andβ-glucanase.Study on the relation between the change and disease resistance.
     1. Measured the inhibition in fermentation filtrate of Trichoderma T115D on Phytophthora infestans. Found the inhibition of fermentation filtrate on mycelium,but not obvious.The result showed that fermentation filtrate strongly inhibited the germination of sporangia and zoospores,release of zoopores.Fermentation filtrate ihibited the mycelia growth but not obvious.The inhibition rate of the germination of sporangia was 57.60%.The inhibition rate of realease of zoospores fsby fermentation filtrate was 75%. The inhibition rate of the germination of zoospores was 60.02%.The control effect on day ahead of inoculation with fermentation filtrate of Trichoderma T115D was the best.The control effect was79.4%.
     2. By using celloidin method and hydration chloral method to observe the pubescence and Stomatal. Found that the number of pubescence in resistant varieties was much than the susceptible varieties, The number of Stomatal in resistant varieties was less than the susceptible varieties,Related with Disease Resistance.
     3.Using spectrophotometer to determine the content of henolics in different potato varietises on not inoculation and after inoculation.The results show that : the content of total phenols,flavonoids,chlorogenic acid in resistant varieties was much than the susceptible varieties after inoculation.The content of total phenols, chlorogenic acid was much than the susceptible varieties on not Inoculation.Using titration method to determine the content of lignin in different potato varietises on not inoculation and after inoculation.The content of lignin in resistant varieties was much than the susceptible varieties on not inoculation.The content of lignin in resistant varieties was much than the susceptible varieties also.
     4. Using spectrophotometer to determine the activities change of defense Enzymes in different potato varietises on not inoculation and after inoculation.After inoculation,The activities change of POD,PPO,PAL,CAT,chitinase andβ-1,3-glucanase in resistant varieties was much than the susceptible varieties.The activities change of POD,PPO,CAT,chitinase andβ-1,3-glucanase in resistant varieties was much than the susceptible varieties.
     5.The content of soluble sugar,soluble protein,α- amylase,invertase in resistant varieties was higher than the susceptible varieties a little.After inoculation,The content of soluble sugar,soluble protein,α- amylase,invertase was higer.As time prolonged,The difference between resistant varieties and susceptible varieties became great.
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