CN106929435B - 一株降解土壤中新烟碱类农药的菌株及其应用 - Google Patents
一株降解土壤中新烟碱类农药的菌株及其应用 Download PDFInfo
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Abstract
本发明一株降解土壤中新烟碱类农药的菌株,其分类命名为镰刀菌(Fusarium.sp),菌株号为CS‑3,保藏编号为CCTCC NO:M 2017137,保藏日期为2017年3月21日。本发明菌株CS‑3为好氧型微生物,最适生长温度为30℃,最适生长pH为7.0,菌株CS‑3在96h内可以完全降解50mg/L的啶虫脒,并利用其作为唯一碳源生长,本发明对生物处理新烟碱类农药污染的土壤具有重要的应用价值。
Description
技术领域
本发明属于生物处理技术领域,涉及一株高效降解土壤中新烟碱类农药的菌株及其应用。
背景技术
新烟碱类杀虫剂来源于植物源农药烟碱,主要作用于害虫的乙酰胆碱酯酶受体。烟碱很早就被人们用作杀虫剂,早在17世纪民间就有了用烟叶粉杀虫的历史。新烟碱类杀虫剂是继有机氯、有机磷、拟除虫菊酯、氨基甲酸脂之后,推出的一类高效、高选择性的新型杀虫剂,由于其杀虫谱广、用量低、作用机制新颖等特点,在国内外市场得到了快速的发展。啶虫脒是氯化烟碱类杀虫剂的代表性品种,属于亚甲基杂环类化合物,广泛用于水稻尤其是蔬菜、瓜果的蚜虫、飞虱以及部分鳞翅目害虫等的防治,由于广泛的在农业生产生活的使用,啶虫脒广泛的存在于环境中,极易通过土壤进入地下水等饮用水资源,其在土壤和水环境中不易降解,不仅会破坏土壤的结构,阻碍或抑制土壤中微生物的生命活动,对人类的身体健康存在着潜在的威胁。
农药在土壤中的残留备受关注,利用微生物修复是一种有效的措施。微生物由于广泛的存在于自然界、并且具有种类繁多、繁殖迅速和对环境适应性强等特点,在农药的生物降解过程中起到了重要作用。相比细菌,真菌具有较强的抗毒性和环境适应能力,生长环境要求不高,易培养。镰刀菌是一种常见的真菌,在环境中广为存在,其对营养要求不高,容易培养。当前国内外研究者已分离到一些啶虫脒的降解菌,并研究了其降解特性,但大多主要集中在细菌方面,对真菌的研究很少,尤其是镰刀菌对啶虫脒的降解在国内尚无报道。王光利等分离得到菌株Pigmentiphaga sp.AAP-1在2.5h内可以完全降解100mg/L的啶虫脒。Swapnil S.Phugare等分离得到菌株Rhodococcus sp.BCH2能将250mg/L的啶虫脒降解14%。因此,筛选高效广谱降解新烟碱类农药啶虫脒的菌株,在土壤的微生物的修复中具有潜在的应用价值。
发明内容
本发明所要解决的技术问题是针对土壤中啶虫脒残留问题,提供一种高效广谱降解新烟碱类农药啶虫脒的菌株。
本发明还要解决的技术问题是提供上述菌株在土壤修复过程中的应用。
为解决上述技术问题,本发明采用的技术方案如下:
一株降解土壤中新烟碱类农药的菌株,其分类命名为镰刀菌(Fusarium.sp),菌株号为CS-3,已保藏于中国典型培养物保藏中心(简称CCTCC),保藏编号为CCTCC NO:M2017137,保藏日期为2017年3月21日,保藏地址为:中国.武汉.武汉大学。
本发明所述的Fusarium.sp CS-3筛选方法:在以啶虫脒为唯一碳源的无机盐养基(pH 7.0)中,对含啶虫脒的土壤降解菌株进行分离筛选。
具体地,以含啶虫脒的土壤菌群作为筛选目标,利用含40mg/L啶虫脒的无机盐培养基作为介质,连续富集驯化具有啶虫脒降解能力的菌株,将富集培养基稀释涂布至含有200mg/L啶虫脒的无机盐固体培养基,30℃培养3-4d,挑取在平板上有透明圈的的啶虫脒降解菌株进行划线分离获得纯培养,命名为菌株CS-3,再次验证纯种微生物菌株CS-3对农药啶虫脒的降解能力,利用液相色谱检测啶虫脒的残余含量;
具体地,所述的无机盐培养基是用硝酸铵1.0g,氯化钠1.0g,磷酸二氢钾0.5g,磷酸氢二钾1.5g,硫酸镁0.1g加水定容至1.0L配制,调节pH值至7.0,固体培养基加入琼脂15.0g,15min、121℃灭菌,使用前添加终浓度40mg/L的啶虫脒作为碳源。本发明所述的Fusarium.sp CS-3在YPD固体培养基上生长较快,30℃,72h可形成直径为4cm的黄白色菌落,菌落大且呈绒毛状,无光泽,干燥,粗糙,不透明,营养菌丝紧紧的插如培养基中,菌株Fusarium.sp CS-3生理生化鉴定的结果与镰刀菌属的特征最为接近。
具体地,所述的YPD培养基是由蛋白胨20.0g,葡萄糖20.0g,酵母粉15.0g,加水定容至1.0L配制,调节pH值至7.0,固体培养基加入琼脂15.0g、20min、115℃灭菌。
一种含有本发明所述的啶虫脒降解菌株Fusarium.sp CS-3 18S rDNA序列的克隆载体。
所述的重组克隆载体,优选出发载体为pMD19T。
含所述的啶虫脒降解菌株Fusarium.sp CS-3 18S rDNA序列的基因工程菌Escherich coli DH5α(pMD19T-18S)。
所述的基因工程菌Escherich coli DH5α构建方法:利用引物ITS1:5`-TCCGTAGGTGAACCTGCGG-3`和ITS4:5`-TCCTCCGCTTATTGATATGC-3`扩增菌株CS-3的18SrDNA,通过T/A克隆的方式连接至克隆载体pMD19T,构建重组克隆载体pMD19T-18S,将其转化到克隆宿主菌Escherich coli DH5α获得重组微生物Escherich coli DH5α(pMD19T-18S),将所获得的重组微生物外源片段进行测序,NCBI数据库比对该18S rDNA序列,在分子水平上将菌株CS-3鉴定至镰刀菌属。
上述菌株CS-3在降解土壤中新烟碱类农药中的应用也在本发明的保护范围之内。
其中,所述的新烟碱类农药优选为啶虫脒。
其中,土壤中啶虫脒浓度为50-100mg/L。
一株新烟碱类农药啶虫脒降解菌株Fusarium.sp CS-3在土壤农药残留处理过程中的应用,具体步骤如下:
(1)菌株CS-3种子液培养:菌株CS-3种子液采用YPD液体培养基培养,取平板保藏的菌株CS-3,用接种环挑去菌落接入含有100mL YPD液体培养基的三角瓶,30℃振荡培养48小时,摇床转速180r·min-1,获得的菌体经无机盐培养基重悬洗涤两次后,菌悬液作为降解试验种子液;
(2)菌株CS-3降解啶虫脒的动力学:在无机盐培养基中添加终浓度为50mg/L的啶虫脒,按5%v/v接种量接入种子液,于30℃,180r·min-1振荡培养,每隔2h取样一次,HPLC检测啶虫脒的残留浓度。
(3)温度和底物初始浓度对菌株CS-3降解啶虫脒的影响:在啶虫脒终浓度为50mg/L的无机盐培养基中,按5%接种量接入种子液,分别于20℃、25℃、30℃、37℃、42℃,pH7.0,180r·min-1振荡培养;分别于啶虫脒初始浓度50mg/l、100mg/1、150mg/l、200mg/l的无机盐培养基中,按5%v/v接种量接入种子液,30℃、180r·min-1振荡培养,测定温度和啶虫脒初始浓度对菌株CS-3降解啶虫脒的影响。
(4)菌株CS-3对啶虫脒中间产物2-氯-5羟甲基吡啶的降解能力测定:在终浓度为100mg/L的含2-氯-5羟甲基吡啶的无机盐培养基中,按5%v/v接种量接入种子液,于30℃,180r·min-1振荡培养,高效液相色谱(HPLC)测定菌株CS-3对2-氯-5羟甲基吡啶的降解能力。
本发明的有益效果在于:
与现有技术相比,该菌株对啶虫脒的降解是高效的,且是第一次有报道镰刀菌可以降解啶虫脒。此外,该菌株对含啶虫脒残留土壤的修复能力也是高效的,适合应用在农药残留土壤的生物治理上。
附图说明
图1是菌株CS-3降解啶虫脒效果图。
图2a是温度对菌株CS-3生长的影响示意图。
图2b是pH值对菌株CS-3生长的影响示意图。
图3a是温度对菌株CS-3降解啶虫脒的影响示意图。
图3b是底物初始浓度对菌株CS-3降解啶虫脒的影响示意图。
图4是菌株CS-3降解2-氯-5羟甲基吡啶效果图。
具体实施方式
根据下述实施例,可以更好地理解本发明。然而,本领域的技术人员容易理解,实施例所描述的内容仅用于说明本发明,而不应当也不会限制权利要求书中所详细描述的本发明。
下述的实施例中所使用的实验方法无特殊说明均为常规方法。
下述的实施例中所使用的实验试剂耗材等无特殊说明均可从商业用途购买。
实施例1:
啶虫脒降解菌株Fusarium.sp CS-3的分离筛选:
取5g啶虫脒污染的土壤样品置于100mL含30mg/L啶虫脒的富集培养基中,于30℃、180r·min-1培养7d。用高效液相色谱(HPLC)测定富集液对啶虫脒的降解情况,确定啶虫脒被降解后,以5%的接种量接入到含40mg/L啶虫脒富集培养基中,继续富集并测定降解情况,按此方法直至啶虫脒浓度提高至100mg/L,并传代3次。
将啶虫脒富集液经梯度稀释后涂布以200mg/L啶虫脒为唯一碳源的无机盐平板上,于30℃培养箱中分别培养5d。将平板上长出的菌落形态不同的单菌落分别划线于LB平板纯化,并接种于以40mg/L啶虫脒为唯一碳源的液体无机盐培养基中,于30℃、180r·min-1摇床培养2d后,取2mL样品12000rpm离心5min取上清,上清加入等体积的二氯甲烷,漩涡振荡仪剧烈振荡1min,静置分层后收集有机相,加入少量无水硫酸钠以除去有机相中的残余水分,吸取1mL二氯甲烷抽提液于通风橱自然挥发干,残留物用等体积的色谱纯甲醇溶解,经0.22μm有机滤膜过滤后,高效液相色谱(HPLC)检测。液相色谱条件:250mm×4.6mm C18反相色谱柱;流动相为50%乙腈;流速为0.5mL·min-1;柱温25℃;Waters 2487紫外检测器,检测波长为248nm;进样量20μL。
菌株Fusarium.sp CS-3可以降解啶虫脒至HPLC检测不到物质,说明菌株CS-3可以完全矿化上述底物。(图1)
实施例2:
啶虫脒降解菌株Fusarium.sp CS-3的鉴定及其生长特性:
Fusarium.sp CS-3在LB平板上生长较慢,但在YPD平板上生长较快,30℃,72h可形成菌落大且呈绒毛状,无光泽,干燥,粗糙,不透明,营养菌丝紧紧的插如培养基中,基于其18S rDNA序列(如SEQ ID No.:1所示)以及生理生化特征,菌株CS-3被鉴定为Fusarium属。
菌株CS-3的最适生长温度为30℃,在25℃也可以很好的生长,但在较高温度(40℃)时,其生长则受到明显抑制(图2a)。菌株CS-3在pH7.0时,生长良好,为其最适生长pH;当pH为4时,其生长就受到明显抑制(图2b)。
实施例3:
啶虫脒降解菌Fusarium.sp CS-3的降解特性:
从YPD平板上挑取菌株CS-3单菌落,分别接种于5mLYPD液体培养基中于30℃,摇床180r·min-1培养48h。然后将该菌株的培养液转接到100mL新鲜的液体YPD培养基中,继续培养20h。8000r·min-1离心10min,收集菌体,用灭菌的无机盐培养基洗涤两次后,即种子液。在啶虫脒终浓度为100mg/L的无机盐培养基中,按5%v/v接种量接入菌株CS-3种子液,于30℃、180r·min-1振荡培养,每隔12h取样一次,HPLC检测啶虫脒的浓度。
实施例4:
啶虫脒降解菌Fusarium.sp CS-3对2-氯5羟甲基吡啶的降解:
YPD平板上挑取菌株CS-3单菌落,分别接种于5mLYPD液体培养基中于30℃,摇床180r·min-1培养48h。然后将该菌株的培养液转接到100mL新鲜的液体YPD培养基中,继续培养20h。8000r·min-1离心10min,收集菌体,用灭菌的无机盐培养基洗涤两次后,即种子液。在啶虫脒终浓度为100mg/L的无机盐培养基中,按5%v/v接种量接入菌株CS-3种子液,于30℃、180r·min-1振荡培养72h,2mL样品12000rpm离心5min取上清,经0.22μm有机滤膜过滤后,高效液相色谱(HPLC)检测。液相色谱条件:250mm×4.6mm C18反相色谱柱;流动相为60%甲醇;流速为0.6mL·min-1;柱温25℃;Waters 2487紫外检测器,检测波长为230nm;进样量20μL。
菌株Fusarium.sp CS-3可以降解2-氯5羟甲基吡啶至HPLC检测不到物质,说明菌株CS-3可以完全矿化上述底物(图4)。
SEQUENCE LISTING
<110> 南京工业大学
<120> 一株降解土壤中新烟碱类农药的菌株及其应用
<130> SG170314001
<160> 1
<170> PatentIn version 3.3
<210> 1
<211> 549
<212> DNA
<213> Fusarium.sp CS-3
<400> 1
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aattgttgcc tcggcggatc agcccgctcc cggtaaaacg ggacggcccg ccagaggacc 120
cctaaactct gtttctatat gtaacttctg agtaaaacca taaataaatc aaaactttca 180
acaacggatc tcttggttct ggcatcgatg aagaacgcag caaaatgcga taagtaatgt 240
gaattgcaga attcagtgaa tcatcgaatc tttgaacgca cattgcgccc gccagtattc 300
tggcgggcat gcctgttcga gcgtcatttc aaccctcaag cccccgggtt tggtgttggg 360
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ccattgcgta gtagtaaaac cctcgcaact ggtacgcggc gcggccaagc cgttaaaccc 480
ccaacttctg aatgttgacc tcggatcagg taggaatacc cgctgaactt aagcatatca 540
aaaagcgga 549
Claims (3)
1.一株降解土壤中新烟碱类农药的菌株,其分类命名为镰刀菌(Fusarium.sp),菌株号为CS-3,保藏编号为CCTCC NO:M 2017137,保藏日期为2017年3月21日。
2.权利要求1所述的菌株在降解土壤中新烟碱类农药中的应用;
其中,所述的新烟碱类农药为啶虫脒。
3.根据权利要求2所述的应用,其特征在于,土壤中啶虫脒浓度为50-100mg/L。
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