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2025年4月5日 星期六
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一种植物双基因共表达载体的构建及应用
翟琪麟1,安泽伟1,李雅超2,赵建文2,谢黎黎2,李维国3,黄华孙1
1. 中国热带农业科学院橡胶研究所
2. 海南大学农学院
3. 国家橡胶树育种中心,中国热带农业科学院橡胶研究所
Construction and Application of A Co-expression Vector for Double Genes in Plants
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摘要 多基因共转化有利于对植物复杂性状进行改良。本研究通过在pXCS-HAStrep质粒中引入一段间隔序列,构建了双基因共表达载体pXCS-Dgene-HAStrep,实现了在一套表达盒内独立表达两个基因,并将克隆自橡胶树(Hevea brasiliensis)的HbWRKY11和HbWRKY7基因克隆入该载体,利用农杆菌(Agrobacterium tumefacien)介导法将构建好的共表达载体pXCS-HbWRKY11-HbWRKY7-HAStrep转入野生型拟南芥(Arabidopsis thaliana),共获得了84株抗Basta除草剂的拟南芥转基因植株。对随机选择的8株转基因植株进行半定量和荧光定量PCR分析表明,HbWRKY11和HbWRKY7基因能同时独立表达, HbWRKY7的表达量略高于HbWRKY11,但差异不显著(Pr=0.4867>0.05);而在不同的转基因植株间,基因的表达差异显著,其中单拷贝的转基因株系S2和S5表达量最高。对双基因共表达株系S2和S5及HbWRKY11和HbWRKY7的单基因转基因株系L3、L4、J1和J5进行低温和茉莉酸胁迫处理,结果表明, 冷应答基因AtCOR47和茉莉酸应答基因AtCOI1及可溶性糖含量在双基因共表达株系中的变化特征与其在单基因转基因株系中的变化特征均表现出明显的差异。实验证明,本研究所构建的双基因共表达载体可以在植物转化中实现一个表达框内独立表达两个基因。
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翟琪麟
安泽伟
李雅超
赵建文
谢黎黎
李维国
黄华孙
关键词 植物表达载体共表达多基因Basta    
Abstract:The simultaneous transfer of multiple genes into plants helps researchers to improve complex traits in plants. In this study, a spacer sequence cloned from pGWB605 was inserted into pXCS-HAStrep, and the co-expression vector named pXCS-Dgene-HAStrep was constructed. HbWRKY11 and HbWRKY7 were cloned into pXCS-Dgene-HAStrep. The plasmid was then introduced into Agrobacterium strain GV3101 (pMP90RK) and transformed into WT Arabidopsis thaliana (Col-0). Eighty-four Basta resistant lines were obtained, and eight of which were randomly selected for semi-quantitative RT-PCR and qRT-PCR analysis. The results showed that HbWRKY11 and HbWRKY7 could express simultaneously, and the expression level of HbWRKY7 was higher than that of HbWRKY11, but the difference was not significant (Pr=0.4867>0.05). The different expression levels of HbWRKY11 and HbWRKY7 were observed among transgenic lines. Among 8 transgenic lines, the highest expression levels of HbWRKY11 and HbWRKY7 were detected in two single-copy T-DNA-transformed lines, S2 and S5. Four single-copy transgenic Arabidopsis lines (L3, L4, J1, J5) had been constructed by overexpressing HbWRKY11 and HbWRKY7 in previous study, respectively. T3 seedlings of L3, L4, J1, J5, S2 and S5 were investigated under cold and jasmonic acid (JA) stress. The results showed that cold- responsive AtCOR47 was strongly induced in all of six lines and wild type genotype under cold stress, and the highest expression level of AtCOR47 appeared in line J5 when all of six lines were treated under cold stress for 24 h. The increase level of AtCOR47 in four single-gene overexpressing lines was higher than that in wild type genotype under cold stress; otherwise the increase level in double-gene co-overexpressing lines was lower than that in wild type genotype. The increase level of soluble sugar content in double-gene co-overexpressing lines was also lower than other lines. Although JA-responsive AtCOI1 was induced under JA stress, the increase level of AtCOI1 in sigle-gene overexpressing lines was lower than that in wild type genotype, and the highest increase level was in double-gene co-overexpressing lines when they were treated under JA stress for 6 h. All the results indicated that two genes can express seperately under one ORF cassette in transgenic plant.
Key wordsPlant expression vector    Co-expression    Multigene    Basta
收稿日期: 2013-01-15     
通讯作者: 黄华孙   
引用本文:   
翟琪麟1,安泽伟1,李雅超2,赵建文2,谢黎黎2,李维国3,黄华孙1. 一种植物双基因共表达载体的构建及应用[J]. , 2013, 21(5): 612-620.
链接本文:  
http://journal05.magtech.org.cn/Jwk_ny/CN/     或     http://journal05.magtech.org.cn/Jwk_ny/CN/Y2013/V21/I5/612
 
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