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辣椒疫病拮抗内生放线菌的筛选及其发酵培养条件研究
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摘要
通过皿内对峙试验从242株供试内生放线菌中筛选到辣椒疫霉病菌拮抗菌62株,抑菌带宽度≥5mm的24株,占试验总菌株的10%,分别分离自黄瓜、牛蒡等9种植物的根部、茎部和叶片。用管碟法进行抑菌活性复筛,发现其中6株的无菌滤液对辣椒疫霉病菌和大豆疫霉病菌的抑菌圈直径≥20mm,其中gCLA4的抑菌活性最强。进一步的研究结果表明,该菌株的无菌滤液能够强烈抑制病菌孢子囊的形成及游动孢子的释放,原液对孢子囊形成及游动孢子释放的抑制率分别高达100%和96.2%,稀释50倍后的抑制率仍分别达95.3%和85.6%,并且对其菌丝生长也有明显的抑制作用,无菌滤液在15.0%稀释终浓度下的菌丝生长抑制率为87.2%。温室盆栽试验结果表明,菌株gCLA4对苗期的辣椒疫病有较好防效。接种疫霉菌前48h、24h和0h以20ml/盆(2株/盆)浇灌gCLA4菌株无菌滤液于辣椒苗基部土壤,接种后7d调查病株率,显示其防效分别达100%、92.3%和80.8%,而接种14d后分别为77.8%、55.6%和36.1%。
     对其摇瓶种子液培养基和发酵培养基以及发酵条件进行了研究,初步筛选出适合内生放线菌gCLA4产生抗菌物质的种子液培养基为黄豆粉培养基,培养36h其生物量达最大;发酵液的培养基最适配方为:1%葡萄糖、0.4%可溶性淀粉、0.2%甘油、2%黄豆粉、0.4%蛋白胨、0.6%(NH4)SO4、0.2%NaCl、0.03% MgSO4·7H2O、0.1%CaCO3、0.02% KH2PO4,初始pH为6.5~7.0。最适发酵培养条件为:接种量12%,装液量50mL/250mL瓶,温度28℃,转速150r/min,培养时间96h。
     内生放线菌gCLA4发酵液的粗提物对辣椒疫霉菌孢子囊的形成,游动孢子的释放以及菌丝生长均具有较强的抑制作用。当粗提物浓度为6mg/mL时,对辣椒疫霉菌孢子囊形成,游动孢子释放的抑制率分别为95.0%和90.4%,对辣椒疫霉菌丝生长的抑制率为95.6%。随着粗提物浓度的降低其抑制效果也相应的下降,当粗提物浓度为0.5mg/mL时,对辣椒疫霉菌孢子囊形成,游动孢子释放的抑制率分别为4.7%和2.9%,对辣椒疫霉菌丝生长的抑制率为12.0%。
Screening of 242 endophytic actinomycetes in plate showed that 62 strains were antagonistic against Phytophthora capsici. Of which 24 strains showed more than 5mm in inhibition zone. These, isolated from 9 plant species, including cucumber, burdock et al. were 10% of the total strains tasted. Re-screening by the cup-plate method, the cell-free fermentation of 6 strains were both antagonistic against P. capsici and P. sojae. Their diameter of inhibition zone was exceeded 20mm. Further investigation showed that the strain gCLA4 inhibited sporangia and zoospores production of P. capsici, respectively 100% and 96.2%. The inhibitory effect of the cell-free filtrate of gCLA4 fermentation 50 times dilution were 95.3% and 85.6% respectively. Pot experiments in greenhouse showed that the cell-free filtrate of gCLA4 fermentation have a good control efficacy to the pepper phytophthora blight in seedlings after inoculated with pathogen. Using gCLA4 cell-free filtrate 48h, 24h and 0h before inoculation, the biocontrol efficacy were 100%, 92.3% and 80.8% respectively investigated 7d after inoculation. The biocontrol efficacy was 77.8%, 55.6% and 36.1% respectively 14d after inoculation. The result showed that endophytic actinomycetes strain gCLA4 was a potential biocontrol agent in pepper Phytophthora blight control.
     Screen the optimal fermentation medium and the optimal culture condition for strain gCLA4. The optimal seed medium was Soybean Flour medium, culture time 36h. And the optimal conditions as the medium(%) was composed of glucose1, starch soluble0.4, glycerol0.2, soybean flour2, peptone0.4, (NH4)SO40.6, NaCl0.2, MgSO4·7H2O0.05, KH2PO40.05, CaCO30.1, pH6.5~7.0. The optimum fermentation condition for the strain: the optimum temperature was 28℃, 250mL shake bottle filled with 50mL liquid medium, inoculation volume was 12%, the agitation speed was 150r/min, fermentation time 96h.
     The investigation showed that the crude extracts of strain gCLA4 inhibited sporangia and zoospores production of P. capsici respectively 95.5% and 90.4%, also it suppressed mycelium growth of P. capsici, the inhibitory effect of 6mg/mL gCLA4 crude extracts was 95.6% respectively.
引文
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