欢迎访问《草业学报》官方网站,今天是 分享到:

草业学报 ›› 2015, Vol. 24 ›› Issue (1): 99-106.DOI: 10.11686/cyxb20150113

• 研究论文 • 上一篇    下一篇

碱茅6-磷酸海藻糖合成酶基因的克隆及其耐逆性分析

李莹1, 2, 柳参奎1*, *   

  1. 1.东北林业大学盐碱地生物资源环境研究中心,黑龙江 哈尔滨 150040;
    2.黑龙江八一农垦大学寒地作物种质改良与栽培重点实验室,黑龙江 大庆 163319
  • 收稿日期:2013-12-13 出版日期:2015-01-20 发布日期:2015-01-20
  • 通讯作者: shenkuiliu@nefu.edu.cn
  • 作者简介:李莹(1979-),女,黑龙江哈尔滨人,讲师,博士。 E-mail:LY7966@163.com
  • 基金资助:
    黑龙江省寒地作物种质改良与栽培重点实验开放课题资助项目(CGIC201204),教育部创新团队发展计划(IRT13053),黑龙江省自然科学基金项目(C201406),中央高校基本科研业务费专项资金(2572014BA20),863项目(2013AA102701-7)和哈尔滨市自然科学基金(2008RFQXN007)资助

Cloning of a TPS gene and analysis of its function in stress tolerance in Puccinellia tenuiflora

LI Ying1, 2, LIU Shenkui1, *   

  1. 1.Alkali Soil Natural Environmental Science Center, Northeast Forestry University, Harbin 150040, China;
    2.Key Laboratory of Crop Germplasm Improvement and Cultivation in Cold Regions, Heilongjiang Bayi Agricultural University, Daqing 163319, China
  • Received:2013-12-13 Online:2015-01-20 Published:2015-01-20

摘要: 从碱茅酵母cDNA文库中经过NaCl、NaHCO3筛选,均得到长为1153 bp碱茅6-磷酸海藻糖合成酶基因(PutTPS)片段。通过3'End cDNA amplification方法获得基因缺失的3'序列,该基因全长3358 bp,编码882个氨基酸。氨基酸序列比较结果表明,PutTPS氨基酸序列与水稻、拟南芥、玉米等多种高等植物的TPS蛋白的同源性高达60%90%。利用Northern blot技术,研究该基因的组织表达模式及NaCl、NaHCO3胁迫处理下基因的表达模式变化;同时对转pYES2- PutTPS基因酵母菌株进行盐、碱、氧化胁迫、渗透胁迫处理,观察其在逆境下的生存表现。结果表明,PutTPS具有组织表达特异性,其中在根和花中表达量最大;NaCl、NaHCO3会诱导PutTPS 基因在根和叶中的上调表达;同时重组酵母菌株对盐碱、氧化、渗透胁迫及干旱等逆境的适应能力显著增强。以上研究结果表明,碱茅PutTPS基因与逆境之间具有一定的应答关系,并在植物适应环境逆境过程中起着重要的作用。

Abstract: In this study, a 6-trehalose phosphate synthase gene (TPS) fragment, 1153 bp in length, was isolated through NaCl and NaHCO3 screening from Puccinellia tenuiflora yeast cDNA library. A 3'-end cDNA amplification technique was used to clone PutTPS. The full-length cDNA is 3358 bp containing an open reading frame (ORF) of 882 amino acids. Multiple alignment analysis based on amino acids of TPS proteins of rice, Arabidopsis, maize, and other higher plants revealed that the amino acid homologies were about 60% to 90%.The tissue expression patterns of P. tenuiflora PutTPS and the expression under NaCl and NaHCO3 stress were further investigated by northern blot. Also the recombinant yeast INVScI (pYES2-PutTPS) and control INVScI (pYES2) were subjected to salt, drought, osmotic and oxidative stresses. PutTPS was highly expressed in roots and flowers; in roots and leaves, NaCl and NaHCO3 induced up-regulated expression of PutTPS genes and the recombinant yeast cells showed higher stress resistance than control cells. It was also found that the TPS from alkali grass contributes to salt, drought, osmotic and oxidative resistance.The present study indicated that there was a relationship between PutTPS expression and multiple stresses, and PutTPS may play an important role for P. tenuiflora during adaption to environmental abiotic stress.