LS-1对番茄叶霉病的防效与诱导抗病性初步研究
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摘要
本论文以东北农业大学植物保护系植物源杀菌剂课题组研制的LS-1为主要研究药剂,以番茄叶霉病(Fulvia fulva)为防治对象,测定了LS-1对番茄叶霉病菌的毒力,LS-1对番茄叶霉病的田间防治效果,初步研究了LS-1对番茄的诱导抗病作用,同时进行了LS-1助剂的筛选,以及研究了在助剂筛选的基础上得到的助LS-1对番茄叶霉病的施药适期和室内接种防治效果。结果如下:
    田间防治试验中,LS-1(20.00g/L)对番茄叶霉病的防效达到62.46%,显著好于植物源药剂银果(0.334g/L)的防效50.19%、生物药剂菌克毒克(0.50g/L)的防效45.70%以及常用化学药剂甲基托布津(0.46g/L)的防效42.95%。
    在对诱导抗病性的研究中发现,番茄植株由LS-1诱导后,其叶片内苯丙氨酸解氨酶(PAL)、过氧化物酶(POD)和多酚氧化酶(PPO)活性均在第7d产生活性高峰,且明显高于对照。说明LS-1能够诱导番茄防御酶活性的显著增强,从而增强番茄抗叶霉病的能力。其中,LS-1的诱导使番茄体内的PAL活性比接种提前3d达到高峰,从而提前加强植株的苯丙烷类的代谢,达到预防番茄叶霉病的作用。
    在单一助剂的筛选中发现,LS-1(20.00g/L)加入助剂Y203(1.00g/L)对番茄叶霉病接种防治效果达77.89%,LS-1(20.00g/L)加入F302(0.50g/L)对番茄叶霉病的接种防治效果达到71.58%。
    在单一助剂筛选的基础上进行了LS-1与2种助剂混配的试验,初步确定LS-1原液与助剂的配方为LS-1:Y203:F302=200:30:3,其对番茄叶霉病的接种防治效果为79.36%。
    通过对助LS-1施药适期的研究,初步认定助LS-1防治番茄叶霉病的最佳施药时期为病菌侵入前7d至病菌侵入后7d,防效在54.09%~86.90%之间,施药间隔期为5d~7d。
    助LS-1对番茄叶霉病的室内接种防治试验中,40.00g/L和20.00g/L的助LS-1的防效分别为89.80%和86.35% ,显著优于常用化学药剂甲基托布津(0.46g/L)的防效68.14%、生物药剂菌克毒克(0.50g/L)的防效72.12%和植物源药剂银果(0.334g/L)的防效46.57%。
The paper measured the toxicity of LS-1 to Fulvia fulva (Cookee ) Ciferri, and studied control effect of LS-1 on Tomato leaf mould in fields, and preliminarily studied induced resistance of tomato by LS-1, also screened adjuvants of LS-1, and studied the appropriate applying time of LS-1 and control effect of applying LS-1 mixted with adjuvants on Tomato leaf mould based on the experiment of screening adjuvant. The results were summarized as follows:
    The field control experiment showed that control effect of LS-1(20.00g/L) on Tomato leaf mould was 62.46%, and which was significantly better than the chemical fungicide (thiophanate-methyl),botanic fungicide(Yinguo) and Bio-fungicide(Junkeduke).
     Studies on induced resistance by LS-1 showed that PAL activity、POD activity and PPO activity in tomato leaves induced by LS-1 reached peaks in 7d at the same time, and significantly higher than Non-treatment. The results above indicated that LS-1 could induce activity of defensive enzyme in Tomato leaves , so as to amplify the capacity of tomatos’ resistance to Fulvia fulva (Cookee ) Ciferri.Especially, PAL activity in tomato leaves induced by LS-1 reached peak 3d ahead than inoculation only,so as to reach the purpose of precaution effect on Tomato leaf mould.
     The experiment of screenring singular adjuvant showed that control effect LS-1(20.00g/L)+Y203(1.00g/L) on Tomato leaf mould was 77.89%, and control effect of LS-1(20.00g/L)+F302(0.50g/L) on Tomato leaf mould was 71.58%.
     The mixture rate of LS-1 mixed with two kinds of adjuvants based on screening singular adjuvant was LS-1:Y203:F302=200:30:3, and its control effect on Tomato leaf mould was 79.36%.
     The appropriate time of applying LS-1 mixed with adjuvants was between 7d before fungus invading tomato and 7d after fungus invading tomato, control effect in this period was from 54.09% to 86.90%,and the time internal was 5d~7d.
     In the experiment of control effect on Tomato leaf mould indoors, control effect of LS-1(40.00g/L)and LS-1(20.00g/L) were 89.80% 86.35%,which significantly were higer than the chemical fungicide (thiophanate-methyl),botanic fungicide(Yinguo) and Bio-fungicide (Junkeduke).
    
    
    Graduate:Zu Yingzhi
    Major:plant pathology
    Supervisor:Prof. Wen Jingzhi
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