酸浆根腐病病原菌分离鉴定及室内药剂筛选
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摘要
近年来,随着酸浆由野生向人工大面积种植的转变,酸浆根腐病也随之而来并逐年加重,成为酸浆生产的限制因素之一。本文选取酸浆种植地区的酸浆根腐病病根,分离鉴定出致病菌并对其生物学特性进行了研究,同时进行了杀菌剂的室内筛选。
     从黑龙江省依兰县酸浆种植不同地块共采集56株酸浆根腐病病根,分离获得110个菌落。分属于5种病原菌:茄腐镰孢菌(Fusarium solani,7号)、尖镰孢菌(Fusarium oxysporum, 4号)、三线镰孢菌(Fusarium tricinctum,2号)、锐顶镰孢菌(Fusarium acuminatum,3号)、砖红镰孢菌(Fusarium lateritium,1号),此外还分离出青霉菌属(Penicillium)中的一些腐生菌。5种病原菌的分离频率分别为34.55%、26.36%、13.34%、7.27%和16.18%。按照科赫式法则与形态学鉴定方法,初步确定致病菌为茄腐镰孢菌(Fusarium solani)与尖镰孢菌(Fusarium oxysporum)。
     为了进一步确定致病菌的分类地位,本研究对4号和7号两种菌株进行ITS序列分析。结果表明:7号菌株扩增片段长度为529bp,经BLAST比对与GenBank中茄腐镰孢菌属中的EU611086.1等菌株序列的同源性达到98%,但未找到同源性为100%的片段,因此可以认为该菌株为茄腐镰孢菌属中的一个新菌种,获得登录号为HQ829354;4号菌株扩增片段长度为504bp,与Genbank中尖镰孢菌(EF611088.1)的同源性为100%,因此可以确定4号致病菌为尖镰孢菌(Fusarium oxysporum)。
     对两种致病菌进行生物学特性分析。结果表明两种菌的最适培养基均为PDA培养基,但光照对它们的生长影响不大,茄腐镰孢菌的最适生长温度为25℃,最适pH值为8.0;尖镰孢菌在pH值为7.0、温度为30℃的PDA培养基上长势最优。
     利用含毒介质法对7种化学药剂进行室内药剂筛选,结果表明:75%百菌清(Chlorothalonil)、60%纯白多菌灵(Carbendazim)、根萎停和50%异菌脲可湿性粉剂(胜扑)在浓度为400 mg/L时抑菌效果较明显,其中60%纯白多菌灵和根萎停两种药剂对茄腐镰孢菌和尖镰孢菌的抑制率最高,可达到100%。选取这两种药剂配制不同浓度梯度的含药培养基,进行抑菌试验,制作毒力回归方程。
     其中60%纯白多菌灵抑制茄腐镰孢菌的EC_(50)为2.78mg/L,根萎停的EC_(50)为2.33 mg/L;60%纯白多菌灵抑制尖镰孢菌的EC_(50)为2.34 mg/L,根萎停的EC_(50)为13.96 mg/L。以此为依据进行两种药剂的混配试验筛选出增效配方。将筛选出来的两种抑菌效果好的药剂按照EC_(50)浓度配成药液,并按照不同体积比进行混配试验,多菌灵与根萎停两种药剂的体积比为3:7、2:8和1:9对抑制茄腐镰孢菌有增效作用;而多菌灵和根萎停的体积比为8:2、7:3、2:8和1:9对抑制尖镰孢菌有明显的增效作用。
In recent years,with the change of Physalis Alkekengi L. planting from the wild to cultivated, Physalis Alkekengi L. Root Rot become more and more serious. It has been one of limitations of Physalis Alkekengi L Production. In this paper,pathogen of Physalis Alkekengi L. Root Rot was identified and biological characteristics,chemical control were studied.
     First, the author collected 56 disease roots and isolated 110 fungals from the growing areas of Physalis Alkekengi L. in Yilan County of Heilongjiang Province.7 fungal species were identified from these isolates, Fusarium solani, Fusarium oxysporum ,Fusarium tricinctum, Fusarium acuminatum, Fusarium lateritium and two kinds of Penicillium. The separation frequency of five pathogens are 34.55%,26.36%,13.34%,7.27% and 16.18%.The results showed that Fusarium solani and Fusarium oxysporum are the main pathogen of Physalis Alkekengi L. Root Rot.
     To further identify the taxonomic status of pathogenic bacteria. The rRNA gene sequence of filamentous fungi was amplified by PCR using fungal universal primers Its1 and Its4.The PCR products were sequenced to identify the fungal species. The results showed that Fusarium solani and Fusarium oxysporum are the main pathogen of Physalis Alkekengi L. Root Rot.
     The results of the biological studies on Fusarium solani and Fusarium oxysporum showed that the favorable medium is PDA medium.But the light is less effect on them.25℃and pH 8 is the optimum condition for Fusarium solani ;and 30℃and pH 7 is the optimum condition for Fusarium oxysporum.
     Using the toxicity of seven fungicides and its concentrations were determined by testing the conidial germination rate and colony growth. The results indicated that conidial germination rate was effeetively inhibited by 75% Chlorothalonil, 60% Carbendazim,Root rot stop and 50% Different bacteria urea . The best effect reach 100% by 60% Carbendazim and Root rot stop.The EC_(50) of two kinds of fungicides were 2.78 mg/L and 2.33 mg/L for Fusarium solani;and the EC_(50) of two kinds of fungicides were 2.34mg/L and 13.96 mg/L for Fusarium oxysporum.For Fusarium solani,60% Carbendazim: Root rot stop (3:7) have synergy ;and for Fusarium oxysporum , 60% Carbendazim: Root rot stop(7:3) have synergy. These ratio have obvious synergy.
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