CN108611298B - 一种深海芽孢杆菌及其在诱导厚壳贻贝稚贝附着中的应用 - Google Patents
一种深海芽孢杆菌及其在诱导厚壳贻贝稚贝附着中的应用 Download PDFInfo
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- 241000894006 Bacteria Species 0.000 abstract description 7
- 241000237852 Mollusca Species 0.000 description 7
- 241000237536 Mytilus edulis Species 0.000 description 5
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- 241000237525 Mytilidae Species 0.000 description 2
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Abstract
一种深海芽孢杆菌,保藏编号为:CCTCC M 2018065,分类命名:芽孢杆菌Bacillus sp.。该细菌形成的微生物被膜对厚壳贻贝稚贝的附着具有相对较高的诱导活性。还涉及一种深海芽孢杆菌在诱导厚壳贻贝稚贝附着中的应用。
Description
技术领域
本发明涉及一株深海细菌在诱导厚壳贻贝稚贝附着方面的应用,具体涉及深海细菌芽孢杆菌(Bacillus sp.29R7-12)的分离、纯化、鉴定和保藏以及其在不同初始细菌密度条件下形成的微生物被膜对厚壳贻贝稚贝附着的影响作用。
背景技术
厚壳贻贝(Mytilus coruscus),隶属于软体动物门(Mollusca),双壳纲(Bivalvia),贻贝目(Mytilodia),贻贝科(Mytilidae),是我国重要的海产贝类养殖品种,分布于黄海、渤海和东海沿岸。厚壳贻贝营养价值较高,具有开阔的养殖前景和市场开发潜力。在厚壳贻贝生活史中,浮游生活阶段的后期,眼点幼虫会附着变态成为稚贝,并最终发育为成贝。在稚贝生长为成贝的过程中,当环境发生变化,厚壳贻贝稚贝能够自行切断足丝,开始爬行并重新选择适宜的附着基进行再次附着。厚壳贻贝作为一种重要的海水贝类养殖品种,其苗种主要依靠天然苗种和半人工采苗获得。近年来,渔业资源的过度开发,天然苗种无法满足厚壳贻贝养殖产业的发展。因此,解决种苗问题、探索利用细菌形成微生物被膜诱导厚壳贻贝附着技术等生物工程技术显得尤为必要。
发明内容
本发明涉及的深海芽孢杆菌(Bacillus sp.29R7-12)来源于下北半岛附近海域大洋沉积物(E 142.20°,N 41.18°),海拔-1180米。利用ZoBell 2216E固体培养基分离、纯化得到纯种菌落,并通过16S rRNA基因测序与GENEBANK(http://www.ncbi.nlm.nih.gov/)中核酸数据进行比对后上传至NCBI数据库。最终确定菌名为芽孢杆菌,获取序列号为MG252257,该细菌保藏于中国典型培养物保藏中心(CCTCC),保藏日期为2018年1月29日,保藏号为CCTCC M 2018065。
还涉及一种上述深海芽孢杆菌在诱导厚壳贻贝稚贝附着中的应用。
进一步地,将纯种的芽孢杆菌菌株接到海水2216E液体培养基中扩大培养,离心后得到细菌沉淀,用灭菌海水洗涤并制成悬浮液,制得深海芽孢杆菌的菌液初始细菌密度为1-500×106cells/ml。
该细菌形成的微生物被膜对厚壳贻贝稚贝的附着具有相对较高的诱导活性。
附图说明
图1为不同初始细菌密度形成的微生物被膜对厚壳贻贝稚贝附着的诱导作用
具体实施方式
下面通过对最优实施例的描述,对本发明的具体实施方式作进一步详细的说明。
菌株的分离及保藏:
本发明涉及的深海芽孢杆菌(Bacillus sp.29R7-12)来源于下北半岛附近海域大洋沉积物(E 142.20°,N 41.18°),海拔-1180米。利用ZoBell 2216E固体培养基分离、纯化得到纯种菌落,并通过16S rRNA基因测序与GENEBANK(http://www.ncbi.nlm.nih.gov/)中核酸数据进行比对后上传至NCBI数据库。最终确定菌名为芽孢杆菌,获取序列号为MG252257,该细菌保藏于中国典型培养物保藏中心(CCTCC),保藏日期为2018年1月29日,保藏号为CCTCC M 2018065。
本发明涉及的深海芽孢杆菌对厚壳贻贝稚贝附着的诱导实验。将纯种的芽孢杆菌菌株接到海水2216E液体培养基中扩大培养,离心后得到细菌沉淀,用灭菌海水洗涤并制成悬浮液,重复多次实验。最后将得到的菌液稀释后用吖啶橙染色并在荧光显微镜1000倍镜头下随机选取10个点进行计数,确定菌液总密度为4×109cells/ml。每个培养皿中放入一枚灭菌载玻片,向培养皿中加入灭菌海水及菌液,使细菌初始密度分别为1.0×106cells/ml、1.0×107cells/ml、1.0×108cells/ml和5×108cells/ml。在18℃下避光条件培养48h形成微生物被膜。最后将附有微生物被膜的载玻片及10只厚壳贻贝稚贝(壳长1.31±0.02mm;壳高0.89±0.02mm)放入含有灭菌过滤海水的培养皿中,在12h时记录稚贝的附着率,即载玻片上附着的稚贝个数占该培养皿中稚贝总个数的百分比。
研究发现该细菌形成的微生物被膜具有诱导厚壳贻贝稚贝附着的活性,实验结果如图1所示,不同初始密度条件下形成的微生物被膜对稚贝的诱导活性也有所不同,在初始密度为1×108cells/ml时,形成的微生物被膜对稚贝附着的诱导率为44.4%,初始密度为1.0×106cells/ml时形成的微生物被膜对稚贝的诱导活性仅为33.3%。由此可得,深海细菌Bacillus sp.29R形成的微生物被膜具有诱导稚贝附着的作用,本研究成果对于阐明厚壳贻贝稚贝附着机制以及对厚壳贻贝的人工养殖均具有重要的意义。
上面对本发明进行了示例性描述,显然本发明具体实现并不受上述方式的限制,只要采用了本发明的方法构思和技术方案进行的各种改进,或未经改进直接应用于其它场合的,均在本发明的保护范围之内。
Claims (3)
1.一株深海芽孢杆菌(Bacillus sp.),其特征在于,保藏编号为:CCTCC NO:M2018065。
2.一种根据权利要求1所述的深海芽孢杆菌在诱导厚壳贻贝稚贝附着中的应用。
3.根据权利要求2所述的应用,其特征在于,将纯种的芽孢杆菌菌株接到海水2216E液体培养基中扩大培养,离心后得到细菌沉淀,用灭菌海水洗涤并制成悬浮液,制得深海芽孢杆菌的菌液初始细菌密度为1-500×106cells/ml。
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