CN109401981B - 金龟子绿僵菌ippmhbhc-7及其应用 - Google Patents

金龟子绿僵菌ippmhbhc-7及其应用 Download PDF

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CN109401981B
CN109401981B CN201811184614.4A CN201811184614A CN109401981B CN 109401981 B CN109401981 B CN 109401981B CN 201811184614 A CN201811184614 A CN 201811184614A CN 109401981 B CN109401981 B CN 109401981B
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王广君
郭隆隆
李贝贝
王晔青
涂雄兵
农向群
张泽华
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Abstract

本发明属于生物技术领域,具体涉及一种金龟子绿僵菌IPPMHBHC‑7及其应用。金龟子绿僵菌(Metarhizium anisopliae)IPPMHBHC‑7,保藏编号为CGMCC No.15999,其对于亚洲小车蝗、毛足棒角蝗具有良好的半数致死时间和僵虫率。

Description

金龟子绿僵菌IPPMHBHC-7及其应用
技术领域
本发明属于生物技术领域,具体涉及一种金龟子绿僵菌IPPMHBHC-7及其应用。
背景技术
蝗虫为直翅目蝗科灾害性昆虫,蝗灾频繁的在我国发生,给我国农业造成了巨大的伤害。目前,我国控制草原蝗虫危害的手段主要是采用化学防治法,其具有快速、高效、使用灵活等优点,但是,随着人们越来越重视环境经济的可持续发展,生物治蝗方法被研发出来并运用到实际工作中去。生物灭蝗法,特别是绿僵菌、白僵菌等,具有一定的专一性,对人畜无害,同时还具有不污染环境、无残留、害虫不会产生抗药性等优点。
虽然杀虫真菌防治蝗虫具有一定的防治效果,但是真菌击倒、杀死害虫作用缓慢,需要经过一段时间才能起作用,适合一般发生年份防治应用,而在蝗虫大发生年份,或局部地区严重发生时,杀虫真菌不能短时间内快速降低虫口密度。同时,生产实践和应用过程中发现一些菌株常出现一定程度的退化,表现为经过几代人工培养后,菌落不稳定、气生菌丝徒长、产孢量减少等特点,从而影响防治效果。
发明内容
为了解决现有技术中存在的真菌击倒、杀死害虫作用缓慢等问题,本发明提供一种金龟子绿僵菌IPPMHBHC-7及其应用。
本发明的目的在于提供一种金龟子绿僵菌IPPMHBHC-7。
本发明的再一目的在于提供金龟子绿僵菌IPPMHBHC-7的应用。
本发明的再一目的在于提供含有金龟子绿僵菌IPPMHBHC-7的生防制剂。
本发明的再一目的在于提供利用金龟子绿僵菌IPPMHBHC-7防治蝗虫的方法。
根据本发明具体实施方式的金龟子绿僵菌(Metarhizium anisopliae)IPPMHBHC-7,其保藏编号为CGMCC No.15999,该菌株于2018年8月2日保存于中国普通微生物菌种保藏中心,保藏中心地址:北京市朝阳区北辰西路1号院中国科学院微生物研究所。
根据本发明具体实施方式的生防制剂,可将金龟子绿僵菌IPPMHBHC-7制成孢子粉直接施用,或者与其他化学药品联用使用。
根据本发明的具体实施方式的防治蝗虫的方法,包括向田间播撒或喷洒含有金龟子绿僵菌IPPMHBHC-7的农用制剂。
本发明的金龟子绿僵菌IPPMHBHC-7对毛足棒角蝗致死时间分别为3.59d,僵虫率分别为96.67%,对亚洲小车蝗的半致死时间为3.55d,僵虫率为93.33%,因此,本发明的金龟子绿僵菌IPPMHBHC-7具有较好的应用前景。
附图说明
图1显示绿僵菌的菌落及孢子形态;
图2显示9种绿僵菌对毛足棒角蝗15d的校正累计死亡率曲线;
图3显示9种绿僵菌对亚洲小车蝗15d的校正累计死亡率曲线。
金龟子绿僵菌(Metarhizium anisopliae)IPPMHBHC-7,其保藏编号CGMCCNo.15999,该菌株于2018年8月2日保存于中国普通微生物菌种保藏中心,保藏中心地址:北京市朝阳区北辰西路1号院中国科学院微生物研究所。
具体实施方式
本发明菌株来源:
本发明测试9种绿僵菌(Metarhizium anisopliae)菌株,分别编号为:
①IPPBHC-5;
②IPPMHBHC-7;
③IPPMHK-7;
④IPPM189;
⑤IPPM803;
⑥IPPM200614;
⑦IPPM2010-10;
⑧IPPB054;
⑨IPPMC384;
本发明试虫的来源:
①毛足棒角蝗(Dasyhippus barbipes Fischer-Waldheim):2~3龄蝗蝻,扫网法采集于内蒙古锡林郭勒盟白云库伦蝗区。
②亚洲小车蝗(Oedaleus decorus asiaticus B.Bienko):2~3龄蝗蝻,扫网法采集于内蒙古锡林郭勒盟西乌旗巴彦高勒北7公里处蝗区。
采集的蝗虫饲养于试验站内专门用于养蝗虫的大框中,每天饲喂适量的新鲜羊草叶片。为保证试验效果,试验前一天饥饿处理。
实施例1绿僵菌IPPMHBHC-7的筛选与鉴定
采用大蜡螟诱集法从收集的土壤中诱集绿僵菌菌株。用消毒的废胶卷盒装入供试土样,每盒埋人1头大蜡螟,重复3次。土样盒放置在24~27℃,保湿诱集1周后,拣出死虫,在恒温25~26℃,相对湿度100%RH中培养7~10天后,从僵虫上分离目标菌株,菌株分离用培养基为PDAY。
将分离到的绿僵菌接种到PDAY固体培养基上,培养至产孢,如图1所示,左图显示绿僵菌的菌落形态,右图显示绿僵菌的孢子形态。孢子粉用0.1%吐温水悬浮,漩涡振荡器振荡均匀,调整孢子浓度为1×108个/mL。取1mL孢子悬浮液接种到100mL产菌丝培养基,置28℃、200r/min摇床振荡培养3d至对数期。用真空泵抽滤得到菌丝,取1g菌丝用液氮研磨至粉末,提取基因组DNA。
以基因组DNA为模板,设计特异性引物扩增IPPMHBHC-7菌株的ITS1-5.8SrRDNA-ITS2序列。PCR产物经1.5%琼脂糖凝胶电泳分离,用胶回收试剂盒回收目的片断,克隆至pGEM-T Easy Vector载体,转化至Trans-T1Phage Resistant感受态细胞中,在氨苄青霉素平板上通过蓝白斑筛选转化子,经PCR检测后,测序。将测定的序列在GenBank中进行BLAST分析,确定菌株IPPMHBHC-7为绿僵菌菌株。
实施例2绿僵菌对毛足棒角蝗蝻致病力的生物测定
采用胃毒法测定上述9种绿僵菌菌株对蝗虫的毒力效果。
首先秤取0.2g绿僵菌孢子粉加入2.0g麦麸中,再加入0.1ml食用油,充分搅拌均匀。然后秤取0.2g配好的绿僵菌麦麸饵剂放入培养皿中,连同培养皿一起放入盖玻璃板的养虫筐,编号,再在养虫筐中放入20头大小一致的3龄毛足棒角蝗蝻。空白对照组麦麸饵剂中不加绿僵菌孢子粉。本实验共10种绿僵菌孢子粉以及一个对照CK,每种孢子粉设置3次重复,即共33个处理,于养虫室内饲养。第二天将饵剂取出,之后每天饲喂适量的新鲜羊草,并调查每筐蝗蝻的死亡情况,分别做好记录。
将死亡的蝗蝻拣出分别放入对应编号的垫有滤纸的培养皿中,保持一定湿度,使之长出僵虫。待试验蝗蝻全部死亡后调查每种菌处理后的蝗蝻的僵虫率,结合处理后15日内每日的累积死亡率和半致死时间(LT50)挑选出对蝗虫致死作用较好的菌种。
Figure GDA0001938478120000031
Figure GDA0001938478120000041
9株绿僵菌菌株对3龄毛足棒角蝗蝻致病力的生物测定结果见图2、表1。
表1 9种绿僵菌对毛足棒角蝗致病力的比较
Figure GDA0001938478120000042
由表1分析可知,上述9种供试菌株对蝗蝻均有致病性,半致死时间在3.59d~8.83d之间,僵虫率在43.33%~96.67%之间,其中绿僵菌菌株IPPMHBHC-7的半致死时间为3.59d,僵虫率分别为96.67%,而绿僵菌菌株IPPM803、IPPM200614、IPPM2010-10等菌株半致死时间稍长、僵虫率较低。因此,绿僵菌菌株IPPMHBHC-7与绿僵菌菌株IPPM803、IPPM200614比较存在显著差异,表明菌株IPPMHBHC-7对毛足棒角蝗有较高的致病力。
实施例3.绿僵菌对亚洲小车蝗致病力的生物测
测定9株菌株对亚洲小车蝗的治病力,测定方法同实施例2的方法。
9株绿僵菌菌株对亚洲小车蝗致病力的生物测定结果见图3、表2。
表2 9种绿僵菌对亚洲小车蝗致病力的比较
Figure GDA0001938478120000043
由表2分析可知,供试菌株对蝗蝻均有致病性,半致死时间在3.55d~10.67d之间,僵虫率在38.33%~93.33%之间。其中菌株IPPMHBHC-7的半致死时间为3.55d,僵虫率为93.33%。与菌株IPPM200614等相比,菌株IPPMHBHC-7的差异显著,表明其对亚洲小车蝗有较高的致病力。
实施例4.绿僵菌不同菌株生长速率和产孢量测定
将不同的绿僵菌菌株孢子稀释到相同的2.5x108孢子/克,分别取10ul转接到PDAY固体平板上,将平板置于27℃培养箱中培养,从第4天开始,每两天测定一次菌落直径。
表3不同绿僵菌菌株的生长速率比较
Figure GDA0001938478120000051
如表3所示,IPPMHBHC-7的生长速率明显高于目前生产上常用的对照菌株IPPM189和其他4个绿僵菌野生菌株。
将不同绿僵菌菌株转接到PDAY固体平板上,在室内连续培养5代,每代培养至15天(约产孢后10天),测定其产孢量,结果见表4。
表4不同绿僵菌菌株的产孢量比较
Figure GDA0001938478120000052
如表4所示,连续培养多代后,金龟子绿僵菌IPPMHBHC-7仍然具有较好的产孢量,而且产孢性状稳定,与生产用对照菌株没有显著差异。

Claims (5)

1.金龟子绿僵菌(Metarhizium anisopliae)IPPMHBHC-7,其特征在于,所述金龟子绿僵菌的保藏编号为CGMCC No.15999。
2.根据权利要求1所述的金龟子绿僵菌(Metarhizium anisopliae)IPPMHBHC-7在防治蝗虫中的应用。
3.根据权利要求2所述的金龟子绿僵菌(Metarhizium anisopliae)IPPMHBHC-7在防治蝗虫中的应用,其特征在于,所述蝗虫为亚洲小车蝗或毛足棒角蝗。
4.一种蝗虫生物防治剂,其特征在于,所述蝗虫生物防治剂包含权利要求1所述的金龟子绿僵菌(Metarhizium anisopliae)IPPMHBHC-7。
5.一种防治蝗虫的方法,其特征在于,所述方法中包含使用权利要求1所述的金龟子绿僵菌(Metarhizium anisopliae)IPPMHBHC-7防治蝗虫的步骤。
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