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草业学报 ›› 2013, Vol. 22 ›› Issue (2): 150-157.

• 研究论文 • 上一篇    下一篇

GsCRCK基因转化农菁1号苜蓿及其耐盐性分析

刘莹,才华,刘晶,柏锡,纪巍,朱延明*   

  1. 东北农业大学生命科学学院,黑龙江 哈尔滨 150030
  • 收稿日期:2012-03-09 出版日期:2013-02-25 发布日期:2013-04-20
  • 通讯作者: E-mail:ymzhu2001@yahoo.com.cn
  • 作者简介:刘莹(1983-),女,满族,吉林辉南人,硕士。E-mail:twinsying2009@163.com
  • 基金资助:
    黑龙江省高校科技创新团队建设计划(2011TD005),国家自然科学基金(31171578)和转基因生物新品种培育重大专项(2008ZX08004-002)资助。

Transformation of the GsCRCK gene into Medicago sativa cv. Nongjing No.1 and salt tolerance analysis in transgenic plants

LIU Ying, CAI Hua, LIU Jing, BAI Xi, JI Wei, ZHU Yan-ming   

  1. College of Life Science, Northeast Agricultural University, Harbin 150030, China
  • Received:2012-03-09 Online:2013-02-25 Published:2013-04-20

摘要: GsCRCK基因是参与胁迫早期应答的钙/钙调素调控的受体类蛋白激酶基因,研究发现GsCRCK正向调控拟南芥对NaCl和ABA胁迫的耐性,将耐盐蛋白激酶基因GsCRCK转化苜蓿,对于增强苜蓿的耐盐性具有重要的现实意义。本研究采用农杆菌介导法将其转入农菁1号苜蓿,获得大量抗性植株。经 PCR和RT-PCR检测证明GsCRCK基因已整合到农菁1号苜蓿基因组中并在转基因植株中转录表达。对获得的2个转基因株系进行耐盐性分析,在300 mmol/L NaCl条件下进行胁迫处理,测定处理0,3,6,9,12,15 d后的质膜透性、丙二醛(MDA)和叶绿素(Chl)含量,以及胁迫15 d时的SOD活性;并统计400 mmol/L NaCl处理15 d时各株系的死亡率。结果显示,300 mmol/L 高盐胁迫15 d后转基因苜蓿仍能正常生长,而野生型苜蓿则遭受盐害严重;转基因苜蓿的相对电导率极显著低于野生型,MDA含量也显著低于野生型,而Chl含量和SOD活性都显著高于野生型;在400 mmol/L NaCl处理下,2个转基因株系的死亡率分别为13.33%和10.00%,明显低于野生型植株(63.33%)。表明GsCRCK基因的导入提高了转基因苜蓿的耐盐性。

Abstract: The stress-responsive kinase gene of wild soybean (GsCRCK) was selected because of the gene expression profiles under salinity, drought and cold stresses, previously established in our laboratory. Over expression of GsCRCK in transgenic Arabidopsis resulted in enhanced plant tolerance to high salinity and ABA. In this study, one plant expression vector regulated by a 35S promoter (named as pBEOCRCK) were constructed to transfer the target gene into Medicago sativa cv. Nongjing No.1 separately by the Agrobacterium-mediated method. Many resistant seedlings of GsCRCK have been obtained. The results of PCR and RT-PCR showed that the GsCRCK gene was normally expressed in transgenic plants. After GsCRCK transgenic M. sativa cv. Nongjing No.1 were stressed with 0, 300 and 400 mmol/L NaCl, we compared transgenic M. sativa to non-transgenic M. sativa by assessing specific physiological indicators. The relative membrane permeability, the content of chlorophyll, the content of MDA, and the activity of SOD in plants which were stressed with 300 mmol/L NaCl were measured together with the death rate from a 400 mmol/L NaCl stress. The transgenic M. sativa had a greater tolerance of salinity stress compared with non-transgenic plants.

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