CN113025632B - 黄瓜木质素生物合成关键酶基因CsCSE及其应用 - Google Patents
黄瓜木质素生物合成关键酶基因CsCSE及其应用 Download PDFInfo
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- CN113025632B CN113025632B CN202110053364.6A CN202110053364A CN113025632B CN 113025632 B CN113025632 B CN 113025632B CN 202110053364 A CN202110053364 A CN 202110053364A CN 113025632 B CN113025632 B CN 113025632B
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Abstract
本发明属于植物分子生物学、基因工程技术领域,具体涉及一种黄瓜木质素生物合成关键酶基因CsCSE及其应用,该基因全长编码区序列见SEQ ID NO.1,其编码的氨基酸序列见SEQ ID NO.2。以高抗白粉病品系黄瓜B21‑a‑2‑1‑2为试材,克隆CsCSE基因全长编码序列并将其插入植物过表达载体pRI101;克隆CsCSE基因5’端特异性片段并将其插入病毒诱导基因沉默表达载体pTRV2,通过农杆菌介导瞬时转化黄瓜子叶。对转化株系进行白粉病菌接种鉴定,证明了CsCSE基因在黄瓜抗白粉病菌过程中的正调控作用,为实际生产中培育抗病、稳产黄瓜新品种提供理论依据,对我国蔬菜产业具有重要应用价值。
Description
技术领域
本发明属于植物分子生物学、基因工程技术领域,具体涉及一种黄瓜木质素生物合成关键酶基因CsCSE及其应用。
背景技术
黄瓜(Cucumis sativus)是我国设施园艺栽培的重要经济作物之一,在蔬菜产业中扮演着重要的角色。随着种植密度加大、连作种植等,黄瓜在栽培中常遭受各种病原菌的侵染,其中白粉病尤为严重。黄瓜白粉病是由葫芦科白粉病菌(Erysiphe ciehoracearum)以及单丝壳白粉病菌(Sphaerotheca fuliginea)引起的一种世界性气传真菌病害,其中S.fuliginea 更为常见。白粉病一旦发生,可使黄瓜减产高达50%,严重限制了我国黄瓜产业的发展。目前,选育和推广抗白粉病黄瓜新品种仍是防治和解决该病害最经济、有效的途径。因此,加强优质白粉病抗性相关基因的挖掘及抗病机理研究,对控制该病害发生和提高黄瓜产量具有重要意义。
发明内容
为了解决上述技术问题,本发明提供了一种黄瓜木质素生物合成关键酶基因CsCSE及其应用,为抗病品种的遗传改良提供一个新的基因资源。
本发明是这样实现的,提供一种黄瓜木质素生物合成关键酶基因 CsCSE,来自高抗白粉病品系黄瓜B21-a-2-1-2,具有SEQ ID NO.1所示的核苷酸序列。
提供一种用于扩增上述的黄瓜木质素生物合成关键酶基因CsCSE的引物,为pRI101-CsCSE-F和pRI101-CsCSE-R,其核苷酸序列如下:
pRI101-CsCSE-F: 5’-CATATGCCCGTCGACATGGCTGCTCAACAACTAGATG-3’;
pRI101-CsCSE-R: 5’-GCTCACCATGGATCCTTTGATTTGGAGATCATCACATTCAGC-3’。
并且,引物5’端的前9个碱基为载体同源序列,紧接着的6个碱基为酶切位点序列,前15个碱基不属于CsCSE基因序列,但为构建重组植物过表达载体所必需。
提供一种上述的黄瓜木质素生物合成关键酶基因CsCSE编码的蛋白质,具有SEQID NO.2所示的氨基酸序列。
提供一种含有上述的黄瓜木质素生物合成关键酶基因CsCSE的重组植物过表达载体,所述载体为pRI101-CsCSE。
提供一种用于扩增上述的黄瓜木质素生物合成关键酶基因CSCSE特异性目的片段的引物,引物为pTRV2-CsCSE-F和pTRV2-CsCSE-R,其核苷酸序列如下:
pTRV2-CsCSE-F:5’-AAGGTTACCGAATTCATGGCTGCTCAACAACT AGATGG-3’
pTRV2-CsCSE-R:5’-GAGACGCGTGAGCTCCCTCATTTTGTTCCTGT TTTCTTTC-3’。
并且,引物5’端的前9个碱基为载体同源序列,紧接着的6个碱基为酶切位点序列,前15个碱基不属于CsCSE基因序列,但为构建重组植物过表达载体所必需。
提供一种含有上述的黄瓜木质素生物合成关键酶基因CsCSE的重组病毒诱导基因沉默表达载体,CsCSE特异性目的片段具有SEQ ID NO.3所示的核苷酸序列,载体为pTRV2-CsCSE。
提供了上述的黄瓜木质素生物合成关键酶基因CsCSE在调控植物抗病性中的应用。
提供了上述的黄瓜木质素生物合成关键酶基因CsCSE的重组植物过表达载体在调控植物抗病性中的应用。
提供了上述的黄瓜木质素生物合成关键酶基因CsCSE的重组病毒诱导基因沉默表达载体在调控植物抗病性中的应用。
进一步地,对于上述应用,转化植物为黄瓜,具体为利用农杆菌介导结合子叶注射,将基因转化至黄瓜。
即,本发明的技术方案如下:
1、提供了一种来自高抗白粉病品系黄瓜B21-a-2-1-2的木质素生物合成关键酶基因CsCSE,其cDNA序列如SEQ ID NO.1所示。
2、提供了上述CsCSE基因编码的氨基酸序列如SEQ ID NO.2所示。
3、提供了含有所述CsCSE基因的重组植物过表达载体以及含有所述 CsCSE特异性目的片段的重组病毒诱导基因沉默表达载体。
4、提供了含有上述3所述重组表达载体的宿主。
5、提供了上述CsCSE基因、重组表达载体以及宿主细胞在调控黄瓜抗病性中的应用。
与现有技术相比,本发明的优点在于:
本发明首次从黄瓜中克隆得到一个木质素生物合成关键酶基因CsCSE 及其所编码的蛋白质CsCSE。利用生物工程手段将CsCSE基因转入黄瓜中,获得CsCSE基因瞬时过表达和沉默株系。结合正、反两方面公开了黄瓜 CsCSE基因作为正调控因子参与黄瓜防卫反应过程。该基因的发现与克隆为黄瓜白粉病的抗性育种提供一个新的候选基因,也为CsCSE蛋白功能的相关研究提供一种研究方向;将该基因转入植物中,有助于获得新的抗病品种,为增强黄瓜白粉病抗性开辟新途径。
附图说明
下面结合附图及实施方式对本发明作进一步详细的说明:
图1为白粉病菌胁迫下,抗白粉病品系B21-a-2-1-2和感白粉病品系 B21-a-2-2-2黄瓜CsCSE基因表达情况;
图2(A)为pRI101-CsCSE载体构建示意图;
图2(B)为CsCSE基因全长编码序列扩增结果;
图2(C)为pRI101-CsCSE菌落PCR电泳检测;
图2(D)为pRI101-CsCSE测序结果;
图3(A)为pTRV2-CsCSE载体构建示意图;
图3(B)为CsCSE基因特异性片段扩增结果;
图3(C)为pTRV2-CsCSE菌落PCR电泳检测;
图3(D)为pTRV2-CsCSE测序结果;
图4(A)和图4(B)为CsCSE基因瞬时转化植株的鉴定,其中:
TRV:00为注射病毒诱导基因沉默表达空载体;TRV:CsCSE为注射 CsCSE的重组病毒诱导基因沉默表达载体;GFP:00为注射植物过表达空载体;GFP:CsCSE为CsCSE重组植物过表达载体,下同;
图5为CsCSE基因瞬时沉默(12d)和过表达(7d)转化黄瓜的白粉病抗性鉴定,其中DI为病情指数,下同;
图6为CsCSE基因瞬时沉默和过表达(20d)转化黄瓜的白粉病抗性鉴定。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,下面结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用于解释本发明,并不用于限定本发明。
黄瓜品种B21-a-2-1-2和B21-a-2-2-2为抗、感白粉病姐妹系,由辽宁省农科院蔬菜所选育提供。该姐妹系在商品性、株型、抗其它病害等性状上基本一致,是开展黄瓜-白粉病互作机理研究以及白粉病抗性相关基因挖掘的重要材料。本发明前期通过高通量转录组测序手段筛选了一个在抗病品系中表达明显上调的基因CsCSE(Cucsa.134370)。CSE是一种新型的木质素生物合成关键酶基因,直接影响植物细胞壁中木质素及其单体含量的变化。然而,目前尚未有研究将CSE影响木质素生物合成与植物抗病性联系起来。因此,开展CSE在黄瓜抗白粉病方面的研究,不仅可以在遗传水平上揭示其参与黄瓜抵御白粉病菌胁迫的调控机理,也为开展黄瓜抗白粉病基因工程育种提供优良的基因资源。
本发明首次公开了CSE在植物抗病中的作用,利用PCR技术从抗白粉病品系B21-a-2-1-2黄瓜中获得CsCSE基因编码区全长。然后,利用农杆菌介导结合子叶注射,获得CsCSE基因瞬时过表达和沉默株系。通过对转化植株抗病性鉴定,证明了CsCSE基因在黄瓜-白粉病菌互作中的正调控作用,为提高黄瓜抗病性提供新思路。
实施例1、白粉病菌胁迫下,黄瓜CsCSE基因的表达模式分析
供试黄瓜品种为B21-a-2-1-2(抗)和B21-a-2-2-2(感)。采用喷雾法对黄瓜幼苗进行白粉病菌接种处理,分别于处理0、3、6、9、12、24h时剪取叶片并液氮研磨。使用RNApreppure plant kit(DP432,天根)提取叶片总RNA,电泳检测RNA提取效果后,使用QuantScript RT kit(KR103-04,天根)将RNA反转录为cDNA。实时定量PCR以所获cDNA为模板,q-F和q-R为引物,qActin-F和qActin-R为内参引物(见表1),运用QuantScript RT kit(KR103-04,天根)和Roche荧光定量PCR仪进行。运用2-△△Ct法进行数据分析,结果见图1。结果表明,白粉病菌胁迫下,CsCSE基因在抗白粉病品系黄瓜中的表达量始终高于其在感白粉病品系中的表达量。
表1 CsCSE基因表达量分析所需引物
实施例2、重组载体pRI101-CsCSE和pTRV2-CsCSE的构建
参考图2(A)、图2(B)、图2(C)和图2(D),以抗白粉病品系B21-a-2-1-2 黄瓜cDNA为模板,pRI101-CsCSE-F和pRI101-CsCSE-R为引物扩增CsCSE 基因编码区全长,回收目的小片段。应用SalⅠ和Bam HⅠ对载体pRI101进行酶切,反应体系为:7μL pRI101质粒,1μL 10×Tbuffer,1μL SalⅠ,1μL Bam HⅠ,37℃反应3h,回收线性大片段。利用HDCloning Plus (TaRaKa,638910)将CsCSE目的小片段连接到pRI101线性大片段上,反应体系为:6μL线性大片段,2μL目的小片段,2μL 5×In-Fusion HD Enzyme Premix,50℃反应15min。利用热激法将连接产物转入大肠杆菌DH5α中,经菌落PCR、测序鉴定后,摇菌、提质粒获得重组质粒pRI101-CsCSE。
参考图3(A)、图3(B)、图3(C)和图3(D),以pTRV2-CsCSE-F和 pTRV2-CsCSE-R为引物扩增CsCSE基因5’端特异性片段,回收目的小片段。应用EcoRⅠ和SacⅠ对载体pTRV2进行酶切,回收线性大片段。将目的小片段连接至线性大片段上,转至大肠杆菌DH5α中,获得重组质粒pTRV2-CsCSE。
实施例3、CsCSE在黄瓜-白粉病互作中的功能鉴定
供试黄瓜品种为新泰密刺。利用冻融法将质粒pRI101、pRI101-CsCSE、 pTRV1、pTRV2和pTRV2-CsCSE分别转入农杆菌EHA105中。应用YEP液体培养基(含50μg mL-1Kan和50μg mL-1Rif)分别培养上述农杆菌,至菌液 OD600为0.6-1.0,收集沉淀菌体;应用缓冲液(含10mM MES和10mM MgCl2的水溶液)洗涤菌体1次;应用注射液(含10mM MES、10mM MgCl2和的200μM AS的水溶液)悬浮菌体,至菌液OD600为0.4,黑暗放置3h;应用无针头注射器将pRI101菌体悬浮液(GFP:00)、pRI101-CsCSE菌体悬浮液 (GFP:CsCSE)、pTRV1菌体悬浮液和pTRV2菌体悬浮液(1:1混合,TRV: 00)以及pTRV1菌体悬浮液和pTRV2-CsCSE菌体悬浮液(1:1混合,TRV: CsCSE)分别注入黄瓜子叶。
提取所有瞬时转化黄瓜株系叶片总RNA,检测CsCSE基因的表达量来筛选并鉴定阳性株系,部分鉴定结果见图4(A)和图4(B)。对瞬时转化株系进行白粉病菌接种处理,通过黄瓜叶片表型观察、白粉病菌菌丝染色以及病情指数调查明确CsCSE基因在黄瓜-白粉病互作中的具体功能。结果表明:过表达CsCSE基因显著提高了黄瓜的白粉病菌抗性,而沉默CsCSE基因显著降低了黄瓜的白粉病菌抗性(图5和6)。
上面结合附图对本发明的实施方式做了详细说明,但是本发明并不限于上述实施方式,在本领域普通技术人员所具备的知识范围内,还可以在不脱离本发明宗旨的前提下作出各种变化。
<110> 沈阳农业大学
<120> 黄瓜木质素生物合成关键酶基因CsCSE及其应用
<130> 2021
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<170> PatentIn version 3.3
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atggctgctc aacaactaga tggcatcacc tatgaagagg attttctatt taactcacgt 60
gggatgaatc ttttcacgtg caaatggctt ccaaaggata aggaaccaaa ggctttgatc 120
ttcatctgcc atggctatgc aatggaatgc agcatcacca tgaatagcac agcaattcgg 180
cttgcaaagg caggttttgc tgtttatggt attgattacg aaggccatgg aaaatcagat 240
ggcttgcaag gctatattac aagctttgat tttgtagtgg atgattgctc caatttcttc 300
acagacattt ctgaaaggaa agaaaacagg aacaaaatga ggtatctgtt aggagagtcg 360
atgggaggag cactggcttt gttattgcat agaaaaaaac cagattattg ggatggtgct 420
gtcttggttg cacctatgtg taagcttgca gatgatgtta aaccaagtcc actagttata 480
aacatactga caaagctttg caattttata cccacatgga aaattgttcc aacccaagat 540
atcattgatg tagctttcaa agttcctgag attagaaatc agatcagaac taatccttac 600
tgttacaaag ggaaacctcg tttgaacact gggcatgaac tcctgaggat cagcttagat 660
ctcgagcaaa gactggatga ggtttcgtta ccgtttataa tcctccatgg agaggaagat 720
cgagtgaccg aaatgtcggc gagtgagcaa ctttatggga aggcgtcgag ctgggataag 780
agcttgaaga gatatccaga gatgtggcat ggattgttgt atggagagac agatgagaac 840
attgatgttg tgtttggaga cataattggt tggttggatg aaagatgtgc tttgggaaat 900
tcaaggatag aaaagcagct caaggctgaa tgtgatgatc tccaaatcaa atga 954
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Claims (8)
1.黄瓜木质素生物合成关键酶基因CsCSE的应用,其特征在于,所述基因CsCSE来自高抗白粉病品系黄瓜B21-a-2-1-2,具有SEQ ID NO.1所示的核苷酸序列;基因CsCSE用于调控黄瓜抗白粉病。
2.根据权利要求1所述的黄瓜木质素生物合成关键酶基因CsCSE的应用,其特征在于,用于扩增所述黄瓜木质素生物合成关键酶基因CsCSE的引物为pRI101-CsCSE-F和pRI101-CsCSE-R,其核苷酸序列如下:
pRI101-CsCSE-F:
5’-CATATGCCCGTCGACATGGCTGCTCAACAACTAGATG-3’;
pRI101-CsCSE-R:
5’-GCTCACCATGGATCCTTTGATTTGGAGATCATCACATTCAGC-3’;
并且,引物5’端的前9个碱基为载体同源序列,紧接着的6个碱基为酶切位点序列,前15个碱基不属于CsCSE基因序列,但为构建重组植物过表达载体所必需。
3.根据权利要求1所述的黄瓜木质素生物合成关键酶基因CsCSE的应用,其特征在于,所述基因CsCSE编码的蛋白质具有SEQ ID NO.2所示的氨基酸序列。
4.根据权利要求1所述的黄瓜木质素生物合成关键酶基因CsCSE的应用,其特征在于,含有所述黄瓜木质素生物合成关键酶基因CsCSE的重组植物过表达载体中,载体为pRI101-CsCSE。
5.根据权利要求1所述的黄瓜木质素生物合成关键酶基因CsCSE的应用,其特征在于,用于扩增所述基因CSCSE特异性目的片段的引物为pTRV2-CsCSE-F和pTRV2-CsCSE-R,其核苷酸序列如下:
pTRV2-CsCSE-F:5’-AAGGTTACCGAATTCATGGCTGCTCAACAACTAGA TGG-3’
pTRV2-CsCSE-R:5’-GAGACGCGTGAGCTCCCTCATTTTGTTCCTGTTTT CTTTC-3’;
并且,引物5’端的前9个碱基为载体同源序列,紧接着的6个碱基为酶切位点序列,前15个碱基不属于CsCSE基因序列,但为构建重组植物过表达载体所必需。
6.根据权利要求1所述的黄瓜木质素生物合成关键酶基因CsCSE的应用,其特征在于,含有所述黄瓜木质素生物合成关键酶基因CsCSE的重组病毒诱导基因沉默表达载体中,CsCSE特异性目的片段具有SEQ ID NO.3所示的核苷酸序列,载体为pTRV2-CsCSE。
7.根据权利要求4所述的黄瓜木质素生物合成关键酶基因CsCSE的应用,其特征在于,所述重组植物过表达载体用于调控植物抗病性,转化植物为黄瓜,具体为利用农杆菌介导结合子叶注射,将基因转化至黄瓜。
8.根据权利要求6所述的黄瓜木质素生物合成关键酶基因CsCSE的应用,其特征在于,重组病毒诱导基因沉默表达载体用于调控植物抗病性,转化植物为黄瓜,具体为利用农杆菌介导结合子叶注射,将基因转化至黄瓜。
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