CN109734786B - 植物花粉育性恢复相关蛋白TaDMT25及其编码基因和应用 - Google Patents

植物花粉育性恢复相关蛋白TaDMT25及其编码基因和应用 Download PDF

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CN109734786B
CN109734786B CN201910211112.4A CN201910211112A CN109734786B CN 109734786 B CN109734786 B CN 109734786B CN 201910211112 A CN201910211112 A CN 201910211112A CN 109734786 B CN109734786 B CN 109734786B
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CN109734786A (zh
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高世庆
赵昌平
张风廷
刘永杰
公杰
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Beijing Academy of Agriculture and Forestry Sciences
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Abstract

本发明属于农业生物技术领域,具体涉及植物花粉育性恢复相关蛋白TaDMT25及其编码基因和应用。所述蛋白的氨基酸序列如SEQ ID No.1所示,基因序列如SEQ ID No.2所示。本发明的花粉育性恢复相关蛋白及其编码基因对改良、提高产量,加速小麦分子育种进程具有十分重要的理论和实际意义。

Description

植物花粉育性恢复相关蛋白TaDMT25及其编码基因和应用
技术领域
本发明属于农业生物技术领域,具体涉及植物花粉育性恢复相关蛋白TaDMT25及其编码基因和应用。
背景技术
植物雄性不育(male sterility,MS)是指雌配子正常发育,雄配子发育异常,能接受外来正常花粉受精结实的现象,目前为止,有610个植物种被报道存在雄性不育类型,包括细胞质雄性不育(CMS)和细胞核雄性不育(GMS),前者由线粒体基因偶联核基因共同控制,后者仅由核基因单独导致。细胞质雄性不育(CMS)又称为核质互作雄性不育,由线粒体不育基因和核恢复基因(restorer of fertility,Rf)共同调控。细胞质线粒体基因产物导致雄性不育,而细胞核育性恢复基因(Rf)产物能改变线粒体中不育基因的转录或表达,使不育系恢复育性。迄今为止,细胞质雄性不育现象己经在水稻、玉米、油菜、棉花、小麦、高粱、大豆等主要农作物和洋葱、辣椒、菜豆、向日葵等园艺作物中发现。
线粒体不育基因及其产物是导致CMS的主要原因,抑制CMS基因的表达,或抵消其不育产生的负面作用是恢复育性的重要途径,细胞核育性恢复基因(Rf)在该过程中扮演了重要角色。Rf基因及其产物PPR蛋白可以在不同的分子水平上通过各种机制使育性恢复。
育性恢复基因可以抑制相关CMS基因的转录,从而降低不育基因转录产物,恢复育性。恢复基因也可能通过减少不育基因编码的蛋白质积累量而恢复育性。现有技术中,雄性不育恢复基因在上述水稻、玉米、油菜等植物的研究中较为清楚,而小麦属于异源六倍体,由A、B、D三套基因组组成,基因组较大,目前其全基因组测序工作尚未完成,而涉及小麦中的控制育性相关的基因或QTL定位、克隆并未在分子水平上得到明确的阐释。
发明内容
本发明的目的在于提供一种植物花粉育性恢复相关蛋白TaDMT25。
本发明的再一目的提供编码上述植物花粉育性恢复相关蛋白TaDMT25的基因。
本发明的再一目的在于提供含有上述编码基因的重组表达载体。
本发明的再一目的在于提供含有上述编码基因的重组菌株。
本发明的再一目的在于提供上述编码基因的应用。
本发明的再一目的在于提供提高植物花粉育性的方法。
本发明提供的植物花粉育性恢复相关蛋白TaDMT25,来源于小麦,其氨基酸序列如SEQ ID No.1所示:
Figure BDA0002000532750000021
Figure BDA0002000532750000031
本发明的蛋白激酶由1536个氨基酸残基组成,是DNA甲基转移酶。自SEQ ID No.1的氨基末端第742-1048位氨基酸残基是BAH结构域,自SEQ ID No.1的第1096-1528位氨基酸残基为Dcm保守结构域。
本发明提供蛋白TaDMT25编码基因,其cDNA序列如SEQ ID No.2所示:
Figure BDA0002000532750000041
Figure BDA0002000532750000051
根据本发明具体实施方式的含有TaDMT25基因的重组表达载体,包括双元农杆菌载体和可用于植物微弹轰击的载体等,还可包含外源基因的3’端非翻译区域,即包含聚腺苷酸信号和任何其它参与mRNA加工或基因表达的DNA片段。
使用基因TaDMT25构建重组表达载体时,在其转录起始核苷酸前可加上任何一种增强型启动子或组成型启动子,如花椰菜花叶病毒(CaMV)35S启动子、玉米的泛素启动子(Ubiquitin),它们可单独使用或与其它植物启动子结合使用;此外,使用本发明的基因构建表达载体时,还可使用增强子,包括翻译增强子或转录增强子,这些增强子区域可以是ATG起始密码子或邻接区域起始密码子等。
为了便于对转基因植物细胞或植物进行鉴定及筛选,可对所用表达载体进行加工,如加入可在植物中表达的编码可产生颜色变化的酶或发光化合物的基因(GUS基因、萤光素酶基因等)、具有抗性的抗生素标记物(庆大霉素标记物、卡那霉素标记物等)或是抗化学试剂标记基因(如抗除莠剂基因)等。从转基因植物的安全性考虑,可不加任何选择性标记基因,直接以逆境筛选转化植株。
根据本发明具体实施方式的提高植物花粉育性的方法,其包括将含有TaDMT25基因导入植物细胞中的步骤,从而得到花粉育性提高的植物。
将本发明所提供的TaDMT25基因导入植物细胞,可获得对植物花粉育性增强的转基因细胞系及转基因植株。携带有编码基因的表达载体可通过使用Ti质粒、Ri质粒、植物病毒载体、直接DNA转化、显微注射、电导、农杆菌介导等生物学方法转化植物细胞或组织,并将转化的植物组织培育成植株。被转化的植物宿主既可以是单子叶植物,也可以是双子叶植物,如:拟南芥、小麦、拟南芥、水稻、玉米、黄瓜、番茄、杨树、草坪草、苜宿等。
本发明以小麦为实验材料,得到了花粉发育相关的TaDMT25基因,并将其导入小麦,显著提高了其花粉育性。本发明的花粉发育相关蛋白及其编码基因对改良、增强小麦产量、加速分子育种进程具有十分重要的理论和实际意义。
附图说明
图1显示转基因小麦进行PCR鉴定的结果,其中,M为DL2000Marker,1-12为不同转基因样品,CK为阴性对照;
图2显示成熟期小麦育性鉴定情况,CK为不育系BS366;T2为转基因小麦株系。
具体实施方式
实施例1.克隆小麦抗旱相关TaDMT25基因的cDNA
对生长10天左右的小麦(Triticum aestivum L.)幼苗进行干旱处理5小时,用Trizol提取小麦总RNA。应用5’RACE试剂盒和3’RACE试剂盒获得TaDMT25基因,该基因全长序列4611bp。
用Trizol提取小麦幼苗的总RNA,用superscript II反转录酶反转录获得到cDNA。设计引物P1和P2,以反转录得到的cDNA为模板,用引物P1和P2进行PCR扩增。
引物P1和P2的序列如下:
P1:5’-ATGGTGAAAAGTCCACGTTC-3’,
P2:5’-TCAGGCCTGCTGACGCTTCGC-3’。
对PCR产物进行0.8%琼脂糖凝胶电泳检测,得到分子量约为4.6kb左右的条带,用琼脂糖凝胶回收试剂盒回收该片段。将该回收片段与pGEM-T Easy(Promega)连接,将连接产物转化大肠杆菌DH5α感受态细胞,根据pGEM-T Easy载体上的氨卞青霉素抗性标记筛选阳性克隆,得到含有回收片段的重组质粒。以该重组质粒载体上的T7和SP6启动子序列为引物对其进行核苷酸序列测定,测序结果表明扩增到的TaDMT25基因的开放阅读框(ORF)为SEQ ID No.2的自5’末端第1至4611位脱氧核糖核苷酸,编码氨基酸序列是SEQ ID No.1的蛋白质。将含序列SEQ ID No.2所示TaDMT25基因的重组载体命名为pTE-TaDMT25。
TaDMT25基因的序列在Genbank上进行比对,在小麦中未发现同源蛋白基因,说明TaDMT25基因是一个新的基因。
进一步用引物P1和P2在小麦基因组中进行扩增,结果显示该基因的基因组序列大小与cDNA长度大小一致,不含有内含子序列。
实施例2.用TaDMT25基因增强植物的花粉育性
1.Ubi-TaDMT25重组表达载体的构建
以小麦的总RNA反转录得到的cDNA为模板,用含有SmaI和SpeI接头序列的特异引物进行PCR扩增;然后SmaI和SpeI双酶切PCR产物回收,将酶切产物正向插入载体pBI221的玉米泛素启动子(Ubiquitin)之后SmaI和SpeI酶切位点之间,得到重组载体pUbi::TaDMT25。
引物序列如下:
TaDMT25[SmaI]5’-TCCCCCGGGG ATGGTGAAAAGTCCACGTTC-3’
TaDMT25[SpeI]5’-GGACTAGT TCAGGCCTGCTGACGCTTCGC-3’
2.转基因小麦的获得
将上述构建的重组表达载体pUbi::TaDMT25分别用冻融法转化根癌农杆菌EHA105,再用pUbi::TaDMT25的根癌农杆菌EHA105转化小麦,用含100mg/L卡那霉素的MS培养基进行筛选,得到阳性转基因植株。将筛选得到的阳性转基因植株用PCR做进一步鉴定筛选,PCR所用的一对引物为P3和P4。
P3(上游引物):5’-CGTATTGAGGACTGGGCAAT-3’,
P4(下游引物):5’-TTACCCCTCTGTTTCTTCAT-3’。
对Ubi::TaDMT25转基因小麦进行PCR鉴定,如图1所示,阳性转基因植株经PCR扩增可获得500bp左右条带,结果获得转Ubi::TaDMT25小麦43株。
同时将pBI221空载体导入小麦,方法同上,作为对照,获得16个株系的转空载体小麦(筛选获得的转基因小麦用T2代表示)。
3.转基因小麦育性表型鉴定
将pUbi::TaDMT25重组表达载体转化农杆菌EHA105,再用含pUbi::TaDMT25的农杆菌EHA105转化小麦不育系材料BS366,通过PCR分子检测得到阳性转基因植株。
对成熟期小麦的结实率统计分析,如图2所示,在可育环境下对照BS366结实率仅为65%左右,而过表达转基因BS366小麦T2株系的结实率达到95%以上,从而证明了过表达TaDMT25基因能够增强转基因小麦的育性及结实率。
序列表
<110> 北京市农林科学院
<120> 植物花粉育性恢复相关蛋白TaDMT25及其编码基因和应用
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atggtgaaaa gtccacgttc tccagttaca acaggaacaa aaaggtgcag agcaaagcca 60
caaaagaagg gtgaagaatc caccgcacaa ggaaaattgg tggatgggcc tcaggatgca 120
acaaatggtg ttgaaaagtg tgctggttct gctactcaca agaggccaag gagggcagca 180
gcctgttctg attttaagga gaaatctgta cgtttatcag aaaaaacttc tgttgtcaag 240
atcaagaaaa atcggatgga agaggaagaa atagatgcaa tcaacctgac aaaattaggg 300
ccagaagatt caccgccttg ccggaagttg attgatttca tcttgcatga tgcagatggg 360
aatctgcagc catttgaaat gtctgaaata gatgattttt tcataacagc tcttatcatg 420
cctatggatg atgatctaga aaaagagcgt gaaagaggtg tatgctgtga aggatttggg 480
cgtattgagg actgggcaat atctggttat gatgaaggta ctgcagtggt ctggctctca 540
acagaacttg ctgattatga atgtgtgaaa ccagcaagca actacaagtc ttacttcaac 600
cacttttatg agaaggcaca ggtatgtgtt gaagtctaca gaaagctcat gagatcagta 660
ggtgggaatc ctaacatgag tctggaagaa ttgcttgcta gtgttgttcg ctctgttaat 720
gccatccaag gttacactgg aacaatgagc aaagaattca tgattgccac tggcgagttt 780
gtatacaacc agcttattgg tttggatcag acggcaggca atgatgatga gaagcttgtt 840
acattgccag ttcttcttgc tctaagagat gagtgcaaat ctcgagcaga atttaccaag 900
atgccactta gcatttcaaa tgggagcctg aagatcaagg atattgagcg taaagaggta 960
gctgaggacg atgatgagaa attagcaaga ttattgcatg aagaagaaga atggaagatg 1020
atgaagaaac agaggggtaa ccgtggagtc ccttcccaga aaaatgtcta catcaaaatt 1080
agtgaagctg agattgcaaa tgactaccct ctgcctgcat actataaacc atctagccag 1140
gaaatggatg aatacatatt tgatagtgag gatggcatgt tctctggtga tgtgccagta 1200
agaatcctca acaactgggc tctatacaat gcagattcta ggcttatttc tctggaatta 1260
atccctatga agtcaggcgc agaaaatgat atagttgtct ttggatctgg ttttatgaga 1320
gaggatgatg gcagttgctg ttccacagct gagtctgcaa agttgtcttc ttcatcaagt 1380
aaagctgata accaggatgt aggagttcca atatatttga gcccaatcaa ggaatgggtt 1440
atagaatttg gtggcttgat ggtttgcata accattcgaa ctgatgtggc ttggtacaag 1500
ctacggcagc caataaagca atatgctcct tggtgtgaac ctgtactgaa aacagcaagg 1560
cttgctgtta gcatcatcac cctgctaaaa gagcaaagcc gtgcttcaaa gctttctttt 1620
gttgatgtca tcaagaaagt ggcagagttt gacaaagaga atcctgcttt tatatcgtcc 1680
aatattgtac tggttgagag gtacattgtg gtacatggac agatcatact tcagcagttt 1740
gcagatttcc ctgatgagac aattcgacgt tgtgcttttg ccactggcct gttgatgaag 1800
atggagcaga gaaggcatac aaagttgttc atgaagaaaa aggctcaagt aacaagagga 1860
gagaatctga acccaattgc aacaatggga acatcatcaa aaagaaaagc aatgcgtgca 1920
accacaacaa gattgatcaa cagaatatgg agtgattact atgcacacca tttccctgaa 1980
gatttgaagg agggagatgg aaatgaagca aaagaagttg atgatgaaca agaagaaaat 2040
gaagatgagg atgctgagga agaggtacag attgaggaag acaaggttgc aaagactcca 2100
ccatcaacac ggtctcgaaa attggtatca caaactagca aagaaatgag atggaagggt 2160
gagccagctg ggaaaacaac ttctggagaa gctttataca aatgtgcgta tgcacgggaa 2220
ctcagaatag atgttggagg ggcagtcaca ctggaagatg attcaggaga aatagtcata 2280
tgctttgttg agtacatgtt tcagaaatct gatggtgcaa aaatggttca tggaagaatt 2340
ctgcaaaaag gctcagaaac tgttcttggc aatgctgcaa atgaaaggga cattttctta 2400
actaatgact gtttggagtt tgaactaaag gacatcaaag aattggtgtc tgtcaatctc 2460
caatcaatgc cttggggtca caagtataga aaagagaatt ctgaagctga gaagattgag 2520
cgggccaaag tgggagagag gaaaaagaag ggtctgccca tggaatattt atgtagaagc 2580
ctgtactggc ctgagaaggg tgccttcttc tctctacctt gtgataaact gggtcttggt 2640
aatggtgtct gtggctcttg tgagcacaga gaaccggact gtgatgaatt aagaatactt 2700
accaagacca gcttcattta cagaaaggta acctatagtg tccatgactt cttatacatt 2760
aggcctgagt ttttctccca agaggaggat cgtggcacct acaaggcagg aagaaacatt 2820
ggcctgaagc cctatgcagt ttgccatctt ctggatgtct gtggacctgc tggttctaaa 2880
aaagttgacc ctgcatcaac caaagtcagt gttcgaagat tttatagacc agatgacatt 2940
tcatctgcta aagcttatac atctgatatc agagaggtat actatagtga agatataatt 3000
aatgtgccgg tggatatgat agagggaaaa tgtgaggtca gaaagaagat agatatctca 3060
aattcagacc ttcctgtaat gattgaacat gtattcttct gtgagcattt ctatgatcgt 3120
gccactggag ctctcaagca ggttctgcct tggcagttgc cttcaaatgt aaagctcatg 3180
tctgtggctc gcaaggcaac tggtgctttg aaaaagaaca agggaaagca gatctgtgaa 3240
aataatgaag ttgattcagg caaatggatg gaagtgccca aagagagccg tattgcaact 3300
cttgacattt ttgctggctg tggaggttta tcagaagggt tgcagcaagc tggtgtgtca 3360
tttacaaaat gggccattga atatgaggaa ccagctggtg aagcatttag gcaaaatcat 3420
ccggaagctg ctgtgtttgt ggataactgc aatgtgattt taaaggcaat catggacaaa 3480
tgtggggatt ctgatgactg tgtctcaact tctgaagctg ctgaacaagc agctaaactt 3540
gctgaagaga atattaaaaa ccttcctgtc cctggtgaag tagaattcat aaatggtggt 3600
cctccctgtc agggcttttc tggcatgaac agattcaacc aaagcccatg gagtaaagtt 3660
cagtgtgaga tgattttagc attcctctct tttgcggagt attttcgtcc cagattcttt 3720
cttttagaaa atgtcaggaa ttttgtttcc ttcaacaaag gacagacctt ccgactggca 3780
gttgcatctc ttctggaaat gggataccag gttcgttttg gaatcttaga agcaggtact 3840
tttggtgttg ctcagtccag gaaaagggca ttcatttggg ctgctgctcc tggagagatt 3900
cttcctgatt ggccagaacc gatgcacgtg tttgctagcc ctgaactgaa aataacactg 3960
cctgatggca aatactatgc agctgccaaa agcactgctg gtggggcgcc tttccgtgca 4020
ataactgtta gagatacaat tggggatttg ccgaaagtgg aaaatggtgc aagtaaactc 4080
atacttgagt atggaggtga gcctacctct tggtttcaga agaagatcag aggtagcact 4140
attgcattga acgatcacat atctaaggag atgaatgaat taaatctcat aagatgcaaa 4200
cacattccca aacgacctgg ttgtgactgg catgacctgc cagatgagaa ggtgaagcta 4260
tcttctgggc aaatggtgga cctgatacct tggtgcttgc ctaacaccgc taaaaggcac 4320
aatcagtgga agggtctgta tgggaggtta gattgggagg gcaatttccc cacttctgtg 4380
actgatcctc agccgatggg caaggttggc atgtgcttcc atcctgacca ggacaggatt 4440
atcacggtcc gtgaatgtgc gcgatctcag ggctttcctg acagctacca gttttcgggc 4500
accattcaga gcaagcacag gcagattggc aacgctgtgc caccccctct tgcctttgcg 4560
cttgggagga agctgaagga agccgtcgat gcgaagcgtc agcaggcctg a 4611

Claims (4)

1.植物花粉育性恢复相关基因TaDMT25在增强小麦的育性及结实率方面的应用,其特征在于,所述植物花粉育性恢复相关基因TaDMT25编码氨基酸序列如SEQ ID No.1所示的蛋白。
2.根据权利要求1所述的应用,其特征在于,所述植物花粉育性恢复相关基因TaDMT25的核苷酸序列如SEQ ID No.2所示。
3.恢复植物花粉育性的方法,其特征在于,所述方法中包括向小麦中导入植物花粉育性恢复相关基因TaDMT25的步骤,所述植物花粉育性恢复相关基因TaDMT25编码氨基酸序列如SEQ ID No.1所示的蛋白。
4.根据权利要求3所述的恢复植物花粉育性的方法,其特征在于,所述植物花粉育性恢复相关基因TaDMT25的核苷酸序列如SEQ ID No.2所示。
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WO2018087301A1 (en) * 2016-11-10 2018-05-17 Keygene N.V. Methods for improving drought resistance in plants - kgdr06, kgdr26, kgdr25, kgdr42 and kgdr37
CN107474125A (zh) * 2017-09-01 2017-12-15 北京市农林科学院 控制小麦温敏雄性不育的相关蛋白及编码基因和应用

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