中国农业科学 ›› 2014, Vol. 47 ›› Issue (6): 1051-1057.doi: 10.3864/j.issn.0578-1752.2014.06.002

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

转G10aroA棉花株系的获得及分子生物学鉴定

 王霞1, 2, 4, 马燕斌2, 吴霞2, 沈志成3, 林朝阳3, 李朋波2, 孙璇2, 王新胜2, 李燕娥2, 李贵全1   

  1. 1、山西农业大学农学院,山西太谷 030801;
    2、山西省农业科学院棉花研究所生物技术实验室,山西运城 044000;
    3、浙江大学农业与生物技术学院,杭州 310029;4运城学院生命科学系,山西运城 044000
  • 收稿日期:2013-07-27 出版日期:2014-03-15 发布日期:2013-10-23
  • 通讯作者: 李燕娥,Tel:0359-2127076;E-mail:lye8270@126.com;李贵全,E-mail:li-gui-quan@126.com
  • 作者简介:王霞,E-mail:wx_myb@163.com。马燕斌,E-mail:myb0517@163.com。王霞和马燕斌为同等贡献作者
  • 基金资助:

    转基因生物新品种培育重大专项(2013ZX08010-003)、国家自然科学基金项目(31201253)、山西省农业科学院博士后项目(BSH1104)、山西省农业科学院博士基金(YBSJJ1204)、山西省科技攻关项目(20120311003-2)和山西省自然科学青年基金(2013021024-3)

Molecular Biology Identification of Transgenic Cotton Lines Expressing Exogenous G10aroA Gene

 WANG  Xia-1, 2 , 4 , MA  Yan-Bin-2, WU  Xia-2, SHEN  Zhi-Cheng-3, LIN  Chao-Yang-3, LI  Peng-Bo-2, SUN  Xuan-2, WANG  Xin-Sheng-2, LI  Yan-E-2, LI  Gui-Quan-1   

  1. 1、College of Agriculture, Shanxi Agriculture University, Taigu 030801, Shanxi;
    2、Biotechnology Laboratory, Institute of Cotton Research, Shanxi Academy of Agricultural Sciences, Yuncheng 044000, Shanxi;
    3、College of Agriculture and Biotechnology,Zhejiang University, Hangzhou 310029; 4Department of Life Science, Yuncheng University, Yuncheng 044000, Shanxi
  • Received:2013-07-27 Online:2014-03-15 Published:2013-10-23

摘要: 【目的】培育具有抗草甘膦除草剂的棉花材料具有极其重要的意义。利用农杆菌介导法在棉花中转入编码EPSPS酶的抗草甘膦除草剂基因G10aroA,通过体细胞愈伤诱导组织培养技术获得能够稳定遗传的转基因棉花株系材料。【方法】首先,利用不同草甘膦抗性筛选条件比较分析不同棉花受体材料的愈伤诱导效率;其次,以R15材料作为受体,利用含有G10aroA的农杆菌侵染下胚轴切段,在进行体细胞愈伤诱导的组织培养过程中通过草甘膦抗性筛选获得棉花再生植株,对获得的棉花再生植株进行纯合繁育。在此基础上,利用PCR扩增检测证实外源G10aroA在转基因植株中能够稳定遗传;利用RT-PCR分析其外源基因在转基因植株不同组织中的转录水平进行研究、并进一步利用Western-blot对转基因植株中外源蛋白的表达进行分析。【结果】在优化的草甘膦筛选条件下,以草甘膦浓度为2.5 mmol•L-1的抗性条件进行棉花愈伤诱导筛选并获得棉花再生植株;利用特异引物进行PCR检测结果表明,在检测的全部再生植株中,扩增得到1.8 kb预期大小目标条带的阳性株系32株,其中,收获的27个株系的外源目标基因能够在T0、T1转基因植株中稳定遗传;对G10aroA在转基因株系L12、L14的不同组织中的转录表达进行定量RT-PCR分析表明,外源G10aroA在转基因棉花植株的不同组织中表达具有差异,相对表达量高低依次为茎、苞叶、叶和花;另外,蛋白检测结果进一步表明,该外源基因能够在转基因株系L7、L12和L14中植株中正常表达为预期46 kD的EPSPS蛋白。【结论】通过农杆菌介导法转化外源抗草甘膦基因G10aroA,在草甘膦抗性条件下进行棉花体细胞诱导的组织培养,成功获得转外源G10aroA的棉花再生株系,并通过分子生物学方法研究证实外源G10aroA能够在T0、T1转基因株系中稳定遗传、转录以及表达。

关键词: 陆地棉 , 草甘膦 , G10aroA , EPSPS

Abstract: 【Objective】It is of great value to develop glyphosate-resistant cotton in China. To obtain the glyphosate-tolerant transgenic cotton line, a new G10aroA gene encoding a 5-enolpyruvylshikimate- 3-phosphate synthase (EPSPS) was transformed into the cotton by Agrobacterium-mediated transformation method. The glyphosate-tolerant transgenic cotton lines can be obtained by somatic callus tissue culture techniques.【Method】 Firstly, the callus induction efficiency of recipient cotton was tested under different concentrations of glyphosate. Secondly, G10aroA was transformed into the hypocotyl segments of cotton line R15 using Agrobacterium-mediated method. The transgenic cotton plants were regenerated from callus tissue culture under selection of glyphosate. The T1 cotton plant seeds were obtained by self-pollination of T0 plants. The G10aroA gene in the transgenic cotton genome was confirmed by PCR, and the transcripts of the G10aroA gene in the transgenic cotton lines were analyzed by RT-PCR. The expression of EPSPS encoded by G10aroA gene was detected by Western blot. 【Result】 Glyphosate concentration of 2.5 mmol•L-1 was selected by comparative analysis for tissue culture. Under this condition, the G10aroA gene was introduced into R15 cotton and thirty-two positive cotton lines were regenerated. These T0 transgenic lines were strictly self-pollinated. The G10aroA gene was confirmed by PCR detection of G10aroA in twenty-seven transgenic lines of T1 generation. The results suggested that the exogenous gene was stably inherited in all of twenty-seven T1 transgenic plants. Quantitative real-time PCR analysis revealed that the exogenous G10aroA gene was expressed varied among different tissues in transgenic line L12 and L14. The order of relative expression level from high to low was stems, bracts, leaves and flowers. In addition, the EPSPS protein of 46 kD size encoded by G10aroA gene was detected in the leaves of transgenic line L7,L12 and L14. 【Conclusion】 The G10aroA gene has been integrated into genomic DNA of the cotton lines via Agrobacterium-mediated method. The transcripts and protein of G10aroA were both detected in the T1 progeny. Thus the transgenic lines may be used for cotton breeding research of glyphosate-tolerant cotton.

Key words: cotton (Gossypium hirsutum L.) , glyphosate , G10aroA , EPSPS