CN116949085B - 草菇Vvpks基因在调控开伞性状中的应用 - Google Patents
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Abstract
本发明提供了一种草菇Vvpks基因在调控开伞性状中的应用。本发明通过构建草菇CRISPR/Cas9 pks基因编辑载体,并转化进野生型草菇,删除了pks基因的283bp的片段,删除片段后的草菇表现出菌褶不发育,不开伞的表型。敲除pks基因后,草菇表现出子实体成熟后不开伞的性状,显著延长了草菇的采摘周期和保存时间,有利于在产业上的应用和推广。
Description
技术领域
本发明涉及生物技术领域,特别涉及草菇Vvpks基因在调控开伞性状中的应用。
背景技术
草菇,又名兰花菇、麻菇、秆菇、广东菇和中国菇等,是一种生长在热带,亚热带地区,喜温喜湿的草腐真菌。在分类学上属于真菌界担子菌纲、伞菌目、光柄菇科、小包脚菇属。草菇栽培具有生长周期短、经济效益高等特点。卵型期草菇具有较高营养价值和经济价值,生产上主要采收卵型期草菇,相比其他食用菌,草菇生长快,新陈代谢活动旺盛,呼吸作用强烈,采摘后的草菇仍具有较高的新陈代谢活动,容易破膜开伞,从卵型变成伞状进入伸长期和成熟期。草菇一旦开伞后,营养价值和商品价值都大大下降。因此育成能保持在卵型期不开伞的草菇具有较高的经济价值。
草菇主要育种方法,包括人工选择育种、杂交育种、诱变育种、原生质体融合育种、基因工程育种等。由于草菇其菌丝细胞多核且无锁状联合,使得从生理形态上区分同核与异核菌丝或亲本与杂交种难以实现,导致草菇遗传育种研究进展十分缓慢,较长一段时间只能借助传统的驯化、组织分离、孢子分离等人工选择方法育种。随着分子生物学的发展,基因编辑技术已经成功应用于多种动、植物及微生物基因组的编辑。
发明内容
本发明的目的在于克服现有技术的缺点与不足,提供一种草菇pks基因在调控草菇开伞性状中的应用。
草菇pks基因在调控草菇开伞性状中的应用,其中,所述的草菇pks基因的核苷酸序列的NCBI数据库序列登记号为HM237364.1。
所述的草菇pks基因被敲除后,草菇表现出菌褶不发育,不开伞的表型。
所述的草菇pks基因是通过CRISPR技术敲除的。
所述的草菇(Volvariella volvacea(Bull.) Singer)为光柄菇科小包脚菇属真菌。
所述的草菇为Volvariella volvacea V23,其基因组的NCBI数据库登记号为GCA_000349905.1。
一种CRISPR基因编辑载体,其核苷酸序列如SEQ ID NO.1所示。
一种草菇菌株,是野生型草菇菌株敲除pks基因后得到的。
所述的草菇pks基因的核苷酸序列的NCBI数据库序列登记号为HM237364.1。
所述的野生型草菇菌株为Volvariella volvacea V23。
所述的草菇菌株,是野生型草菇菌株使用SEQ ID NO.1所示的载体敲除pks基因后得到的。
一种草菇孢子,为上述草菇菌株培养后得到。
一种草菇菌丝体,为上述草菇菌株培养后得到。
一种草菇子实体,为上述草菇菌株培养后得到。
所述的草菇子实体在食品加工中的应用。
本发明的目的通过下述技术方案实现:
本发明相对于现有技术具有如下的优点及效果:
草菇其菌丝营养生长所需的温度为 32~34℃,最适宜的出菇温度为28~30℃,在适宜的条件下播种后 8~10 天即可收获达到商品要求的子实体,是所有人工栽培大型可食用真菌中所需栽培时间最短的种类。草菇子实体采收后,自身的新陈代谢活动较为旺盛,子实体很快破膜开伞,从卵形子实体变成伞状体,开伞后,草菇的蛋白质、核酸、碳水化合物等营养物质含量均低于纽扣期和蛋形期。而本发明通过基因编辑的手段,删除了pks基因的283bp的片段,删除片段后的草菇表现出菌褶不发育,不开伞的表型,防止草菇子实体开伞后消耗营养成分,能够提高草菇子实体的营养价值和经济价值,在草菇养殖产业中具有广泛的应用前景。
附图说明
图1是实施例2中草菇转化子与野生型扩增得到的pks基因片段的凝胶电泳结果。
图2是实施例2中草菇转化子与野生型扩增得到的pks基因片段序列对比结果。
图3是实施例2中草菇转化子与野生型培养后不同天数的培养基形态图。
图4是实施例2中草菇转化子与野生型培养得到的子实体切开后的形态对比图。
具体实施方式
下面结合实施例及附图对本发明作进一步详细的描述,但本发明的实施方式不限于此。
下面实施方案中若未注明具体试验条件,则通常按照常规试验条件或按照试剂公司所建议的试验条件。所使用的材料、试剂等,若无特殊说明,均为从商业途径得到的试剂和材料。
实施例1
1、编辑载体构建
通过CodonUsage数据库分析得到Cas9蛋白在草菇中表达的合适编码序列VvCas9,并加入核定位信号,提交生物公司合成。根据NCBI公布的草菇gpd基因(编码甘油醛-3-磷酸脱氢酶,glyceraldehyde-3-phosphate dehydrogenase)启动子序列设计相应的引物并扩增得到VvPgpd。
构建gRNA表达盒,根据侧耳、裂褶菌的U6序列在草菇基因组中搜寻草菇U6启动子序列,通过生物信息学网站预测草菇pks基因的靶位点,在靶位点后接上gRNA scaffold和草菇U6的3’-UTR,得到gRNA表达盒。
选择突变的sdhB(succinatedehy drogenase)基因,点突变后可编码萎锈灵(carboxin)抗性基因,该基因可通过点突变或基因合成的方法得到。
采用Infusion的方法依次将VvPgpd、VvCas9、gRNA表达盒、VvsdhB基因连接,将连接后得到的片段连入表达载体得到草菇CRISPR/Cas9 pks基因编辑载体,载体的核苷酸序列如SEQ ID NO.1所示。
2、载体转化
(1)以草菇子实体为材料制作原生质体
制2%酶液:称取0.2g裂解酶(L1412 sigma aldrich)于15ml离心管,加入250μL0.2M pH值5.7的MES缓冲液、7.5ml 0.8M的甘露醇溶液、1.7ml ddH2O。将切成小块的草菇子实体,放入酶液30℃酶解1.5h,收集原生质体。
(2)原生质体转化与筛选
调节原生质体浓度为 1×108/mL,用手轻弹重悬,分装至2ml 离心管中;取160μL原生质体,每管加入160μL STC溶液和5μg 步骤1中得到的草菇CRISPR/Cas9 pks基因编辑载体,用手轻弹混匀原生质体;加入50μL PTC缓冲液,轻轻混匀。室温放置5min,2000rpm离心去除上清;加入1ml 4℃预冷的CYM液体培养基,轻轻混匀;加入到100ml冷却的CYM固体培养基中,倒平板,30℃培养22h;原生质体萌发后再铺一层含4μg/ml萎锈灵的PDA固体培养基,能够萌发的原生质体即成功表达了载体的转化子,编号后用于后续实验。
实施例2
1、转化子验证
经过实施例1中萎锈灵培养基筛选得到草菇转化子pks9-1、pks9-2和pks9-3,设计pks基因编辑位点附近的引物序列,对筛选到的转化子及野生型菌株提取DNA,用设计的引物扩增,得到的片段进行凝胶电泳及测序。其中未突变野生型菌株扩增片段大小约为800bp,pks基因片段删除后约为500bp,杂合菌株为包含800bp和500bp两条带,凝胶电泳结果如图1所示,pks9-2与野生型的片段序列对比结果如图2所示,实验结果显示,草菇CRISPR/Cas9 pks基因编辑载体成功敲除了草菇pks基因。
鉴定引物pks-F:CGTGTCTGTTCTCGGATCAAAG;
鉴定引物pks-R:ACCATGGAGCCTCGTCTTCTTCGG;
扩增的目标序列如下,小写部分为转化子pks-2中被敲除的部分:
cgtgtctgttctcggatcaaaggctccctGTCCAGAGTTGAGGCACTCCTGTATTCTAGGGTTGTGGAAAGCTAGTAGGAATCTTGCTGAGAATTCTTCCAAGGTAGACCGCCGTGGAAGCAGCCAGCCTAAGAAATTCTATATAAGCTGCAACCTACATCTCACCGCTGAAGCACACTTGTACTGCAATGGCCCCCACTAATGCCTCCCTCGACGTACCCATCTTctctggacatggtactgcagctgctcgatctgtacaagtgatccaacaggccgttcgtgatgcgtcaataccggcaggctctgtgcttctttccgcttgccatgaagcgttccaccaagaactatcgtcgctttcgatcgaagaactcgggcacctgaacgtgaatctggcagacttttacgacaaagccgctttgctttcgttgtccacagaccgttaccggcacaaccccttaatttctgggtgctctcttttcttgatccaatctttacggtaccttgcgTATGTGGAAGATGTTCGTATATCCACGAGGCCCTTGCAGTCATCTTGTGATGCACCCGATCGCCATTTCCAGCAAGGCCTCGAGGTATTAGGGTTCTCCTCAGGGATATTGCCAGCATGCATCGTAGCGACTTCAACTTCGACGATTTCCTATATCTCACGAGCGGTGGAGGTGTTTCGGTTAGCCATTTGGATCGGCGTTCGTTGTCACCAATTTCGTATACGTGAATTAGAAGCAGCGCGCCTACCCAAGGATTGTTCTTTACCATGGAGCCTCGTCTTCTTCGG。
2、pks基因缺失后表型观察
将转化子pks9-1、pks9-2和pks9-3突变菌株与野生型草菇接种到出菇培养基(含棉籽壳50%、稻草50%,含水量60%,121℃灭菌1.5 h)上30℃培养,每种接种三份培养基,观察并记录表型。
原基出现7d后,野生型菌株在原基形成后全部开伞,转化子pks9-1、pks9-2和pks9-3突变菌株长出子实体但是不开伞;9d后野生型菌株全部萎蔫,突变菌株的子实体仍保持不开伞且没有出现萎蔫,如图3所示。切开转化子pks9-1、pks9-2和pks9-3突变菌株与野生型草菇的子实体后,突变菌株的子实体表现出菌褶不发育(图4)。实验结果证明,敲除pks基因后,草菇表现出子实体成熟后不开伞的性状,显著延长了草菇的采摘周期和保存时间,有利于在产业上的应用和推广。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (1)
1.草菇pks基因在调控草菇开伞性状中的应用,其特征在于:
所述的草菇pks基因的核苷酸序列的NCBI数据库序列登记号为HM237364.1;
所述的草菇pks基因被敲除后,草菇表现出菌褶不发育,不开伞的表型;
所述的草菇pks基因是通过CRISPR技术敲除的,具体的,是使用CRISPR/Cas9 pks基因编辑载体敲除的,CRISPR/Cas9 pks基因编辑载体的核苷酸序列如SEQ ID NO.1所示。
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