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苦参内生拮抗细菌筛选及其抗菌物质纯化鉴定
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摘要
该论文从中药材苦参中分离筛选具有抑菌活性的内生细菌,对其分类地位、发酵条件、定殖能力、抗菌物质纯化鉴定及其机用制进行了系统研究。分离筛选获得了具有广谱抑菌作用的内生细菌B_(36)菌株,鉴定为枯草芽孢杆菌;明确了B_(36)菌株的最佳发酵条件;从B_(36)菌株发酵液中分离纯化出了2种抗菌物质,经鉴定为环状脂肽类的抗生素;该抗生素可破坏番茄叶霉病菌细胞膜,并能够抑制菌丝生长和孢子萌发。该研究对植物内生细菌的开发与应用和新型微生物农药的创制,具有重要理论指导意义及一定实际应用价值。
     从苦参根中分离筛选到了拮抗内生细菌B_(36)菌株。采用稀释平板法从辽宁省沈阳天柱山上采集的苦参根内一共分离到了148株内生细菌,通过平板对峙培养法得到29株具有较强活性的菌株,再进一步通过对菌株无菌滤液抑菌活性的测定和盆栽活体试验筛选得到了抑菌活性强的目的生防菌B_(36)菌株。该菌株的无菌滤液对玉米弯孢霉叶斑病菌[Curvularia lunata(Walk)Boed]、菜豆炭疽病菌(Colletotrichum lindemuthianum)、小麦根腐病菌(Helminthosporium sorokinianum Pam.et al.)、番茄灰霉病菌(Botrytis cinereaPers.)、番茄叶霉病菌[Fulvia fulva(Cooke) Cifferri]等病原菌表现出了很强的抑制作用,抑菌圈直径都在25.0mm以上,对小麦白粉病的离体叶片的防效达到了95.71%,而盆栽防效也很高达83.20%,对番茄灰霉病也有一定的预防效果(防效为71.49%)。因此该菌株作为生防菌具有一定的研究和应用潜力。
     对B_(36)菌株的生理生化性质进行研究,结合分子生物学手段确定了分类地位。B_(36)菌株性质为革兰氏阳性反应,有芽孢,可运动,利用柠檬酸盐,利用葡萄糖,蔗糖,果糖,甘露醇产酸,可还原硝酸盐为亚硝酸盐,水解淀粉和明胶,利用葡萄糖发酵产酸等。其16SrDNA全序列共有1463bp,通过建立系统发育树得出枯草芽孢杆菌Bacillus subtilisstrain B432与菌株B_(36)的亲缘关系最近,聚在一起。因此鉴定B_(36)菌株为枯草芽孢杆菌(Bacillus subtilis)。
     通过单因子试验和正交试验方法,得到了最适枯草芽孢杆菌B_(36)菌株的发酵培养条件。最适宜发酵条件为发酵温度28-33℃,转速150 r·min~(-1),接种量20%,初始pH 9.0,在250mL三角瓶的装液量为50 mL,发酵36h。最佳培养基组成为葡萄糖2.0%,酵母粉0.5%,大豆粉0.5%,NH_4NO_3 0.5%,CaCO_3 1.0%。优化培养条件后B_(36)菌株产生抗菌物质能力明显增强,抑菌圈直径提高了13.3%。
     采用抗生素双标记的方法研究了枯草芽孢杆菌B_(36)菌株在番茄植株体内的定殖动态。结果表明,接种方法显著影响B_(36)菌株在植株体内的定殖和传导,以浸根、浸种处理效果最好,灌根次之,喷雾和针刺处理在植株根部检测不到B_(36)菌株。采用浸根法接种后结果表明标记菌株可在番茄根际和根表有效定殖,在根际定殖能力强于根表,定殖动态为先向下降后上升再下降。浸根处理后标记菌株能在番茄体内定殖,并传导至茎部和叶片,随着接种天数的增加,标记菌株在根部定殖数量整体上呈下降趋势,而在茎部和叶部定殖的菌量均呈现出“先增后降”的趋势,到后期各组织中菌量基本趋于稳定。
     采用有机溶剂沉淀法,溶媒萃取法和大孔吸附树脂法对枯草芽孢杆菌B_(36)菌株发酵产生的抑菌活性成分进行初步提取。结果表明,有机溶剂沉淀法和溶媒萃取法提取抗菌成分的能力较低,而大孔吸附树脂法提取抗菌成分能力强。因此选择大孔树脂HP20进行吸附,以75%乙醇为洗脱剂进行动态解吸初步提取枯草芽孢杆菌B_(36)菌株的抗菌成分。
     采用硅胶柱层析,结合薄层层析和生物活性追踪方法分离枯草芽孢杆菌B_(36)代谢产物的粗提物,经过3次硅胶柱层析后得到活性最好,含量最高的组分。通过HPLC-MS分析,负离子电离后得到洗脱时间分别为5.7min和6.9min的两种化合物,进ESI\MS二级质谱电离后得到其结构。分子量为1042.5Da的化合物A结构为Cys-Asp-Tyr-Gln-氨基脂肪酸-Pro-Asn-Gln,7环肽C_(14)的环状脂肽类化合物;分子量为1056.5Da的化合物B结构为氨基脂肪酸-Asn-Asp-Met-Gln-Tyr-Asn-Gln-Asn-Pro-Ser,10环肽C_(17)的环状脂肽类化合物。
     采用生物化学等方法研究枯草芽孢杆菌B_(36)菌株抗菌物质对番茄叶霉病菌的作用机制。结果表明,菌株B_(36)抗菌物质粗提物对番茄叶霉病菌抑菌圈直径达20.5mm,并引起菌丝畸形,产生囊泡,并抑制分生孢子萌发,当抗菌物质浓度为1.06×10~3μg·mL~(-1)时,孢子萌发抑制率达到86.56%,果胶酶和羧甲基纤维素酶的酶活分别为0.5911 U·mL~(-1)和0.01757 U·mL~(-1),显著低于对照,说明B_(36)抗菌物质抑制两种菌丝胞外细胞壁水解酶的合成,并通过破坏细胞膜结构产生抑菌作用,而抗菌物质对病菌菌丝细胞壁组成物质几丁质和菌丝蛋白质的浓度没有影响。
An endophytic bacterium with antagonistic activity was isolated from Sophora which belonged to traditional Chinese medicines and its classification,ferment conditions, colonizing ability,and its extraction method and antifungal mechanism to pathogen of its antagonistic substances were studied.Strain B_(36) was abtained which was Bacillus subtilis and it could colonize effectively on Figs.Two antagonistic substances of endophytic bacteria from Sophora were the first time obtained,and it belonged to cyclic lipopeptide,which destroyed the structure of plasma membrane and expressed obvious inhibition on spores germination and grown on hyphae of Fulvia fulva.
     Strain B_(36) was obtained from Sophora flavescens Ait root.148 bacteria strains were isolated by dilution- Fig method from roots of Sophora flavescens Ait were sampled at Tianzhu mountain in Shenyang City Liaoning Province.29bacteria strains showed antagonistic activity though confront culture method against pathogens on Fig,then the aimed strain B_(36) which sterile-filtered supernatant had the strongest antagonistic activity against pathogens in Fig experiment as well as in pot culture trails was screened.Strain B_(36) had antagonistic effect on Helminthosporium sativu Pammel.el al.,Curvularia lunata (Wakker) Boed,Colletotrichum lindemuthianum,Botrytis cinerea Pers.,and Fulvia fulva (Cooke) Cifferris et al.,the inhibition zone diameters were all arrived at 25.0mm.As well as strain B36 showed biological control activity against Wheat powdery mildew of experiment in vitro and in pot and against tomato gray mold with control effect were 95.71%,83.20% and 71.49%respectively,so Strain B_(36) had great capacity of research and application.
     According to the characteristics of morphological feature,physiology,biochemistry tests and the comparison of 16SrRNA sequence the classification of strain B_(36) was established. The results indicated that it was positive of gram,germ staining and acid production from glucose,and utilized glucose,sucrose,mannitol,fructose as carbon source,it could reduce nitrate,hydrolysis starch and gelatin.The16S rDNA sequence of B_(36) Strain was 1463bp, according to the phylogenetic tree,closest relative strain to B_(36) Strain was Bacillus subtilis B432,as the strain B_(36) was Bacillus subtilis.
     The culture conditions and the compositions of cultural medium of Endophytic B36 strain which was isolated from Sophora with Antifungal Activity were studied by using the single factor and orthogonal design method.According to the antagonistic activity of sterile-filtered B36 and its grown.The optimal fermentation parameters were 28-33℃,150 r·min-1,pH 9.0,20%inoculation volume,and 50mL culture in 250mL flask for 36h,which had the strongest antagonistic activity.The fermentation medium was modified and the optimized medium was composed of sucrose 2.0%,yeast 0.5%,soybean flour 0.5%, NH_4NO_30.5%and CaCO_31.0%.Under this optimized condition,the inhibition zone diameter increased 13.3%to the initial condition.
     Colonizing dynamics of t he strain B_(36) in tomato were studied by labeling method with double antibiotics-resistance.The results showed that strain B_(36) marked with double antibiotics-resistance could colonize the root of tomato and deliver into the issues which were influenced significantly by inoculation methods.The density of marked strain in the tomato after inoculated by pruned root and soaking seed were munch more then by soil drench,there were no marked strain in root of tomato by spraying foliar and daubing leaf method.After inoculated with pruned root,the marked strain B_(36) could colonize the root of tomato that could enhance the biocontrol effect to pantheons,and the strain B_(36) had stronger colonize ability around the roots then in the surface of the roots.Then the marked strain could deliver into internal stem and leaf tissues,and its density decreased in root gradually while increased in stem and foliage then decreased as the plant growing.
     The antifungal substances of Baciliius subtilis B_(36) strain were extracted by organic solvents precipitates,solvents extraction and macroporous adsorption resin methods.The extraction effect of macroporous adsorption resin method had showed better effection than the other methods.So macroporous resin HP20 was adopted to adsorb the antifungal substances of Baciliius subtilis B_(36) and 75%ethanol was selected for desorption the antifungal substances that with dynamic experiment.
     A component had greatest antagonistic activity and content was obtained by three times separated with silica gel column,then analyzed by HPLC-MS negative ion.Two components with elution time were 5.7min and 6.9min respectively were obtained,and their composition were determined by electro spray ionization mass spectrometry.The results showed that component A(with a molecular weight of 1042.5Da) had a primary structure of seven cyclic lipopetides link to C_(14):Cys-Asp-Tyr-Gln-Fatty acid-Pro-Asn-Gln,and component B(with a molecular weight of 1056.5Da) had a primary structure of ten cyclic link to C_(17):Fatty acid-Asn -Asp-Met-Gln-Tyr-Asn-Gln-Asn-Pro-Ser.
     Antifungal effect of active substances extracted by macroporous adsorption resin method from endophytic bacteria B_(36) to Fulvia fulva(Cooke)Cif.were studied.The results showed that the pathogenic hyphae grew in abnormal shape and produced sac,and the inhibition zone diameter was 20.5mm after treated with the crude extracts of antifungal substances.The antifungal substances also expressed obvious inhibition effect on spores germination.The inhibition rate was 86.56%and the activity of PMG and Cx were 0.5911 U·mL~(-1) and 0.01757 U·mL~(-1) which were both lower than the control significantly when the concentration of antifungal substances arrived at 1.06×10~3μg·mL~(-1).So it was concluded that the antifungal substances could inhibit the activity of PMG and Cx and destroy the structure of plasma membrane,but could not decompose the chitin or inhibit the content of proteins.
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