CN112553247A - 一种通过gus染色显示拟南芥植株不同部位转录因子abi5活力的方法 - Google Patents
一种通过gus染色显示拟南芥植株不同部位转录因子abi5活力的方法 Download PDFInfo
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Abstract
利用GUS染色显示拟南芥植株不同部位转录因子ABI5活力的方法,主要包括:受ABI调控的GUS表达载体的构建;GUS表达载体转化进入农杆菌;农杆菌介导的花粉管法将GUS表达载体转入拟南芥中;拟南芥转化株系的筛选和鉴定。本发明的方法可以用于研究拟南芥中与ABI5蛋白相关代谢路径的调控机制;且该构建方法具有广泛的适用性,可以普遍用于其他植株中,利用GUS染色显示不同部位转录因子的调控活力。
Description
技术领域
本发明涉及拟南芥ABI5活力显示株系的构建方法,具体涉及一种利用GUS染色方法显示拟南芥不同部位转录因子ABI5活力的方法。
背景技术
ABI5(ABA-INSENSITIVE 5)是拟南芥响应干旱/高盐胁迫下的一个重要的转录因子,属于碱性亮氨酸拉链(basic domain leucine zipper,bZlP)类转录因子。这些转录因子可以与特定的顺式作用元件相结合,从而组成特定的调控网络。在植物遭受外界胁迫条件下,他们通过调控不同基因的表达,调节拟南芥植株自身的生长发育,从而对胁迫产生耐受性。因此,阐明转录因子ABI5如何调控植物的生长发育,及其分子机理具有重要的研究价值。有利于培育新的抗旱/抗盐转基因作物。而研究拟南芥不同时空,其ABI5调控活力的变化规律,是ABI5调控植物生长代谢机制的一个关键部分,对于阐明其调控机制的作用模式具有重要价值。
GUS(b-glucuronidase)基因是一种重要的报告基因,广泛应用于植物学研究中。GUS基因来源于大肠杆菌,该基因编码一种水解酶,b-葡聚糖苷酶,可以催化底物5-溴-4-氯-3吲哚葡聚糖醛酸苷(X-Gluc)分解,产生肉眼可见的兰色化合物。因此GUS染色技术可以用于观察转基因植物的外源基因的表达情况。由于植物体内没有类似的基因存在,故GUS染色技术具有操作简单、背景低,且可以检测到具体细胞、组织部位的表达强弱情况。
发明内容
本发明的目的在于提供一种利用GUS染色方法显示拟南芥植株不同位置转录因子ABI5调控强弱的方法,通过将ABI5特异性结合的结合位点进行串联重复,并与最小CaMV35S启动子序列相结合,构建出受ABI5结合强弱调控的启动子,再将该启动子克隆到pCAMBIA1301载体的GUS基因上游,使GUS基因表达受ABI5调控活力的调控,并将该调控元件导入拟南芥野生型Col中,构建拟南芥转基因植物。该植株可以通过GUS染色检测在不同时间和空间条件下,拟南芥转录因子ABI5的调控活力的变化情况。有利于阐明转录因子ABI5的调控作用机理。
为实现上述目的,本发明的技术方案具体如下:
一种利用GUS染色方法显示拟南芥不同部位转录因子ABI5活力的方法,包括以下步骤:
S1:构建受拟南芥转录因子ABI5蛋白调控的GUS表达载体p5XABS-GUS;
S2:将p5XABS-GUS通过化学转化方法转化进入农杆菌中;
S3:采用农杆菌介导的花粉管导入法,将p5XABS-GUS转化进入拟南芥植株中,收集侵染后的拟南芥种子;
S4:培养步骤S3获得的种子并进行筛选和鉴定,获得拟南芥转化株系并收集种子;
S5:培养步骤S4中的种子,通过GUS染色显示拟南芥幼苗不同部位ABI5调控强弱。
进一步的,所述步骤S1包括:
S1-1:将拟南芥转录因子ABI5蛋白特异性结合的DNA序列碱基串联重复5次,获得5XABS序列;
S1-2:将5XABS序列与最小CaMV 35S启动子序列相连组成5XABS启动子序列;
S1-3:合成5XABS启动子序列,并克隆到载体pCAMBIA1301载体的EcoRI/NcoI位点,获得表达载体p5XABS-GUS。
进一步的,所述步骤S4包括:
S4-1:培养步骤S3获得的种子,通过潮霉素筛选方法筛选转化植株并收集种子;
S4-2:培养步骤S4-1获得的种子,通过GUS染色鉴定转化植株进行复筛,获得拟南芥转化株系并收集种子。
进一步的,所述步骤S4-1包括:
1)将步骤S3获得的种子消毒:分别采用70%酒精消毒2min,无菌水冲洗3次,20%的次氯酸钠消毒15min,无菌水冲洗5-6次;
2)将处理后的种子用l ml无菌水重悬并均匀涂布在含有潮霉素B的MS固体筛选培养基上;
3)将MS固体筛选培养基置于光照培养箱中,25℃,16h光照/8h黑夜光周期培养;两周后,得长势正常的阳性植物;
4)将长势正常的转化株,移入另一个不含潮霉素的MS固体培养平板上,25℃,16h光照/8h黑夜光周期培养;4天后,移入营养土中,25℃,16h光照/8h黑夜光周期于温室培养,收集种子。
进一步的,所述步骤S4-2包括:
1)将步骤S4-1获得的种子消毒:分别采用70%酒精消毒2min,无菌水冲洗3次,20%的次氯酸钠消毒15min,无菌水冲洗5-6次;
2)将处理后的种子用l ml无菌水重悬并均匀涂布在MS固体培养基表面;
3)将MS固体培养基置于光照培养箱中,25℃,16h光照/8h黑夜光周期培养;一周后,将小苗分别移栽入营养土中,25℃,16h光照/8h黑夜光周期于温室培养,2周后,用无菌剪刀分别剪下每个苗的一片莲座叶;使用GUS染色液染色;挑选染色相对较深的叶片所对应株系,培养并收集种子,得构建好的拟南芥转化株系5XABS::GUS/Col。
本发明还提供了上述方法制备的表达载体p5XABS-GUS。
与现有技术相比,本发明的有益效果:
本发明的方法通过将转录因子ABI5蛋白的结合位点和最小CaMV 35S启动子融合,构建一个受ABI5蛋白调控的启动子,并使用该启动子来调控GUS蛋白的表达,再将表达载体转化进入拟南芥中,构建成转化株系。该转化株系可以通过GUS染色直接显示拟南芥株苗不同位置的ABI5调控强弱。与传统的通过目标基因表达的Q-PCR检测、荧光蛋白标记等方法相比,本发明的方法具有以下几个优点:1)可以测定ABI5蛋白表达的具体细胞和组织部位;2)检测快速、简便、灵敏度高且重现性好;3)ABI5的调控强弱可以进行定量测定;4)报告基因的表达不受细胞内其它基因表达产物的干扰。
附图说明
图1为构建的p5XABS-GUS载体图谱;
图2为拟南芥5XABS-GUS转化株系幼苗的GUS染色图片。
具体实施方式:
下面以拟南芥5XABS-GUS转化株系构建为例对本发明的技术方案进行具体进行说明,需要说明的是,实施例仅对本发明的优选实例进行描述,并非对本发明的构思和范围进行限定。在不脱离本发明设计思路的前提下,本领域中专业技术人员对本发明所做的改变与替换,均属于本发明的保护范围。
此外,所用试剂均是市场购买的试剂级以上试剂。大肠杆菌(Escherichia coli)XL10 gold作为DNA操作时使用的宿主菌,包含50μg/mL卡纳霉素的Luria-Bertani(LB)培养基用作培养E.coli。农杆菌GV3101感受态购自于上海唯地生物技术有限公司,用于侵染拟南芥,构建转化株系。GUS染色试剂盒购自北京酷来搏科技有限公司。5XABS启动子序列合成和载体构建由通用生物生物系统有限公司完成。
5XABS启动子序列如下:
序列1(SEQ ID NO:1):GACGCTCGTCATGCGGTACACGTGGCAATCTT
序列2(SEQ ID NO:2):
GACGCTCGTCATGCGGTACACGTGGCAATCTTGACGCTCGTCATGCGGTACACGTGGCAATCTTGACGCTCGTCATGCGGTACACGTGGCAATCTTGACGCTCGTCATGCGGTACACGTGGCAATCTTGACGCTCGTCATGCGGTACA
序列3(SEQ ID NO:3):
CGTGGCAATCTTGCAAGACCCTTCCTCTATATAAGGAAGTTCATTTCATTTGGAGAGAACACGGGGGACTCTTGACC
序列4(SEQ ID NO:4):
GACGCTCGTCATGCGGTACACGTGGCAATCTTGACGCTCGTCATGCGGTACACGTGGCAATCTTGACGCTCGTCATGCGGTACACGTGGCAATCTTGACGCTCGTCATGCGGTACACGTGGCAATCTTGACGCTCGTCATGCGGTACACGTGGCAATCTTGCAAGACCCTTCCTCTATATAAGGAAGTTCATTTCATTTGGAGAGAACACGGGGGACTCTTGA。
实施例1:5XABS-GUS表达载体的设计及合成
1.5XABS启动子的设计
先将选择的含有ABI5特异性结合位点的序列(序列1),串联重复5份为序列2。然后将序列2和CaMV35S最小启动子序列(序列3)连接,构成目标5XABS启动子序列(序列4)。
2.5XABS-GUS表达载体的构建
将序列4送通用生物系统有限公司合成,并由公司克隆进入pCAMBIA1301载体的EcoRI/NcoI位点,获得目标表达载体p5XABS-GUS(图1)。
实施例2:5XABS::GUS/Col拟南芥转化株系的构建
该实施案例中,通过使用实施例1所述的表达载体p5XABS-GUS,通过化学转化方法转化进入农杆菌GV3101细胞中。然后使用该农杆菌转化子,采用农杆菌介导的花粉管导入法转化拟南芥野生型植株(Col)。收集转化后的拟南芥种子,使用潮霉素抗性筛选方法筛选成功转化的拟南芥株系。筛选获得的株系通过GUS染色方法进一步鉴定。
具体的实施步骤为:
1.化学法转化p5XABS-GUS进入GV3101。从-80℃取出GV3101感受态细胞,冰上融化后,加入1μl(100ng)的质粒p5XABS-GUS。轻轻混匀后按照产品使用说明书转化。
2.农杆菌介导的花粉管导入法转化拟南芥(Col)野生型植株
1)培育健康的拟南芥野生(Col)植物直至开花。25℃,光照周期为16小时光照,8小时黑暗于温室培养。
2)活化农杆菌
①挑取活化的含有p5XABS-GUS质粒的单克隆阳性农杆菌GV3101菌株,至5ml新鲜的LB液体培养基(含50μg/ml kan,20μg/ml rif)28℃,200rpm过夜活化。
②次日晚将已活化的菌种按(1:50)转接至300ml的LB液体培养基(含50μg/mlkan,20μg/ml rif)中培养,28℃,300rpm。
③次日上午测OD值,用LB液体培养基(含50μg/ml kan,20μg/ml rif)作为空白对照,当菌液达到OD600为1.5~3.0之内时,可收集菌体于50ml离心管中,4000g离心10min。
④用渗透缓冲液(1/2MS培养基+5%蔗糖)重悬细胞至OD600约为0.8~1.0,以渗透缓冲液为对照,加入终浓度为0.02%SilwettL-77,混匀。
4)将已授粉、结荚的拟南芥用消毒剪去除,倒置于装有重悬菌体渗透缓冲液的合适大小的容器上侵染50S,用塑料薄膜覆盖整个托盘并适留通气孔后,在弱光下培养,2h后取下薄膜,于室温中继续培养。
5)每隔1天重复一次侵染,共侵染3次。
6)正常浇灌植物,用蜡纸,胶带,扭绳或其他方法捆绑松动的茎干。随着种子成熟,停止浇水。
7)约30日后收获种子,此为T0代种子,干燥1周后放到-20℃春化24h。
3.转化子的筛选
1)将收集的T0代种子消毒:分别采用70%酒精消毒2min,无菌水冲洗3次,20%的次氯酸钠消毒15min,无菌水冲洗5-6次。
2)处理后的种子用l ml无菌水重悬并均匀涂布在MS固体筛选培养基(含有50mg/L潮霉素B)表面。
3)于光照培养箱中,25℃,16h光照/8h黑夜光周期培养。两周后,经潮霉素B抗性筛选的阳性植物表现良好,长势正常,而阴性植物则不萌发或不久死亡。
4)将长势良好的转化株,移入另一个不含潮霉素的MS固体培养平板上,25℃,16h光照/8h黑夜光周期培养。4天后,移入营养土中,25℃,16h光照/8h黑夜光周期于温室培养,收集种子。获得T1代种子。
5)种子复筛:
①将收集的T1代种子消毒:分别采用70%酒精消毒2min,无菌水冲洗3次,20%的次氯酸钠消毒15min,无菌水冲洗5-6次。
②处理后的种子用l ml无菌水重悬并均匀涂布在MS固体培养基表面。
③光照培养箱中,25℃,16h光照/8h黑夜光周期培养。一周后,将小苗分别移栽入营养土中,25℃,16h光照/8h黑夜光周期于温室培养,2周后,用无菌剪刀分别剪下每个苗的一片莲座叶。使用GUS染色液染色。挑选染色相对较深的叶片所对应株系,培养并收集种子,此为T2代种子。既为构建的拟南芥转化株系5XABS::GUS/Col。
4.GUS染色分析拟南芥幼苗不同部位ABI5调控强弱。
1)将收集的T2代种子消毒:分别采用70%酒精消毒2min,无菌水冲洗3次,20%的次氯酸钠消毒15min,无菌水冲洗5-6次。
2)处理后的种子用l ml无菌水重悬并均匀涂布在MS固体培养基表面。
3)光照培养箱中,25℃,16h光照/8h黑夜光周期培养。5天后,用镊子从MS平板上挑幼苗按照产品使用说明书进行GUS染色,分析幼苗不同部位ABI5调控强弱。如图2所示,5天的幼苗其根尖部位相对于其他部位的ABI5蛋白活力最高,受其调控的GUS蛋白表达最多,染色最深。
序列表
<110> 江苏师范大学
<120> 一种通过GUS染色显示拟南芥植株不同部位转录因子ABI5活力的方法
<160> 4
<170> SIPOSequenceListing 1.0
<210> 1
<211> 32
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 1
gacgctcgtc atgcggtaca cgtggcaatc tt 32
<210> 2
<211> 148
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 2
gacgctcgtc atgcggtaca cgtggcaatc ttgacgctcg tcatgcggta cacgtggcaa 60
tcttgacgct cgtcatgcgg tacacgtggc aatcttgacg ctcgtcatgc ggtacacgtg 120
gcaatcttga cgctcgtcat gcggtaca 148
<210> 3
<211> 77
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 3
cgtggcaatc ttgcaagacc cttcctctat ataaggaagt tcatttcatt tggagagaac 60
acgggggact cttgacc 77
<210> 4
<211> 223
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 4
gacgctcgtc atgcggtaca cgtggcaatc ttgacgctcg tcatgcggta cacgtggcaa 60
tcttgacgct cgtcatgcgg tacacgtggc aatcttgacg ctcgtcatgc ggtacacgtg 120
gcaatcttga cgctcgtcat gcggtacacg tggcaatctt gcaagaccct tcctctatat 180
aaggaagttc atttcatttg gagagaacac gggggactct tga 223
Claims (6)
1.一种利用GUS染色方法显示拟南芥不同部位转录因子ABI5活力的方法,其特征在于,包括以下步骤:
S1:构建受拟南芥转录因子ABI5蛋白调控的GUS表达载体p5XABS-GUS;
S2:将p5XABS-GUS通过化学转化方法转化进入农杆菌中;
S3:采用农杆菌介导的花粉管导入法,将p5XABS-GUS转化进入拟南芥植株中,收集侵染后的拟南芥种子;
S4:培养步骤S3获得的种子并进行筛选和鉴定,获得拟南芥转化株系并收集种子;
S5:培养步骤S4中的种子,通过GUS染色显示拟南芥幼苗不同部位ABI5调控强弱。
2.根据权利要求1所述的方法,其特征在于,所述步骤S1包括:
S1-1:将拟南芥转录因子ABI5蛋白特异性结合的DNA序列碱基串联重复5次,获得5XABS序列;
S1-2:将5XABS序列与最小CaMV 35S启动子序列相连组成5XABS启动子序列;
S1-3:合成5XABS启动子序列,并克隆到载体pCAMBIA1301载体的EcoRI/NcoI位点,获得表达载体p5XABS-GUS。
3.根据权利要求1所述的方法,其特征在于,所述步骤S4包括:
S4-1:培养步骤S3获得的种子,通过潮霉素筛选方法筛选转化植株并收集种子;
S4-2:培养步骤S4-1获得的种子,通过GUS染色鉴定转化植株进行复筛,获得拟南芥转化株系并收集种子。
4.根据权利要求3所述的方法,其特征在于,所述步骤S4-1包括:
1)将步骤S3获得的种子消毒:分别采用70%酒精消毒2min,无菌水冲洗3次,20%的次氯酸钠消毒15min,无菌水冲洗5-6次;
2)将处理后的种子用l ml无菌水重悬并均匀涂布在含有潮霉素B的MS固体筛选培养基上;
3)将MS固体筛选培养基置于光照培养箱中,25℃,16h光照/8h黑夜光周期培养;两周后,得长势正常的阳性植物;
4)将长势正常的转化株,移入另一个不含潮霉素的MS固体培养平板上,25℃,16h光照/8h黑夜光周期培养;4天后,移入营养土中,25℃,16h光照/8h黑夜光周期于温室培养,收集种子。
5.根据权利要求3所述的方法,其特征在于,所述步骤S4-2包括:
1)将步骤S4-1获得的种子消毒:分别采用70%酒精消毒2min,无菌水冲洗3次,20%的次氯酸钠消毒15min,无菌水冲洗5-6次;
2)将处理后的种子用lml无菌水重悬并均匀涂布在MS固体培养基表面;
3)将MS固体培养基置于光照培养箱中,25℃,16h光照/8h黑夜光周期培养;一周后,将小苗分别移栽入营养土中,25℃,16h光照/8h黑夜光周期于温室培养,2周后,用无菌剪刀分别剪下每个苗的一片莲座叶;使用GUS染色液染色;挑选染色相对较深的叶片所对应株系,培养并收集种子,得构建好的拟南芥转化株系5XABS::GUS/Col。
6.权利要求1或2所述方法中制备的表达载体p5XABS-GUS。
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