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作物学报 ›› 2016, Vol. 42 ›› Issue (04): 501-512.doi: 10.3724/SP.J.1006.2016.00501

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

甘蔗Na+/H+逆转运蛋白基因的克隆与表达分析

刘峰,苏炜华,黄珑,肖新换,黄宁,凌辉,苏亚春,张华,阙友雄   

  1. 福建农林大学农业部福建甘蔗生物学与遗传育种重点实验室 / 国家甘蔗产业技术研发中心, 福建福州 350002
  • 收稿日期:2015-09-07 修回日期:2016-01-11 出版日期:2016-04-12 网络出版日期:2016-01-19
  • 通讯作者: 阙友雄, E-mail: queyouxiong@126.com
  • 基金资助:

    本研究由国家现代农业产业技术体系建设专项(CARS-20)，国家公益性行业(农业)科研专项(201503119)和福建省高等学校新世纪优秀人才支持计划(JA14095)资助。

Isolation and Characterization of a Na+/H+Antiporter Gene from Sugarcane

LIU Feng**,SU Wei-Hua**,HUANG Long,XIAO Xin-Huan,HUANG Ning,LING Hui,SU Ya-Chun,ZHANG Hua,QUE You-Xiong*   

  1. Key Laboratory of Sugarcane Biology and Genetic Breeding (Fujian), Ministry of Agriculture, Fujian Agriculture and Forestry University / SugarcaneResearch & Development Center, China Agricultural Technology System,Fuzhou 350002, China
  • Received:2015-09-07 Revised:2016-01-11 Published:2016-04-12 Published online:2016-01-19
  • Contact: 阙友雄, E-mail: queyouxiong@126.com
  • Supported by:

    This study was supported by the China Agriculture Research System(CARS-20), the Special Fund for Agro-Scientific Research in the Public Interest (201503119), and the Program for New Century Excellent Talents in Fujian Province University (JA14095).

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摘要：

Na+/H+逆向转运蛋白基因SOS1(salt overly sensitive 1)是植物耐盐性的必需基因之一，在植物抵御盐胁迫过程中发挥十分重要的作用。本研究以小麦EST序列KJ563230为探针，利用电子克隆技术结合RT-PCR,获得一条甘蔗SOS1基因的cDNA序列，命名为ScSOS1 (GenBank登录号为KT003285)。序列分析结果表明，该基因全长1403bp，包含一个1272bp的开放阅读框，编码423个氨基酸的蛋白质。ScSOS1蛋白的相对分子质量为47.6kD，理论等电点(pI)为9.12。氨基酸序列分析表明，ScSOS1蛋白具有一个CAP-EDsuperfamily结构域。生物信息学预测显示，ScSOS1的编码蛋白为亲水性蛋白，不存在信号肽，二级结构元件多为无规则卷曲，主要参与中间代谢。实时荧光定量PCR分析表明，ScSOS1基因的表达具有组织特异性，在甘蔗叶鞘、蔗皮、蔗髓、侧芽和根中均有表达，其中在叶鞘中的表达量最高，根中的表达量最低。此外在NaCl、PEG、ABA、SA和MeJA的胁迫过程中，该基因表达均受到调控，其中受NaCl和PEG诱导后上调表达，均在24 h表达量达最高，分别约为对照组的1.5倍和4倍。推测该基因的表达与甘蔗耐盐性和抗渗透胁迫有关。

关键词: 甘蔗, SOS1基因, 电子克隆, 生物信息学, 实时荧光定量PCR

Abstract:

Salt overly sensitive 1(SOS1) gene, encoding a Na+/H+antiport protein, plays an important role in biological processes of plants against salt stress. Using a SOS1 mRNA sequence from Triticum aestivum (KJ563230) as the probe, the homologous ESTs of sugarcanewere obtainedfrom NCBI database. A sugarcane cDNA sequence of SOS1 gene was cloned by in silicocloning combined with RT-PCR,and named as ScSOS1 (GenBank accession number: KT003285). The bioinformatics analysis showed that ScSOS1 has a length of 1403bp witha complete open reading frame (ORF, 107 to 1423 bp), encoding a 423 amino acid residues of sugarcane SOS1 protein with an estimated molecular weight of 47.6 kD and a calculated isoelectric point (pI) of 9.12. The protein of ScSOS1 belongs to a conserved CAP-ED superfamily. Yet the ScSOS1 protein has no signal peptide and belongs to hydrophilic protein with the main function forintermediary metabolism. The mainly secondary structure element of ScSOS1 protein is random coil. Real-time quantitative PCR (RT-qPCR) analysis revealed that ScSOS1was tissue-specificallyexpressed in leaf sheath, bark, pulp, bud and root of sugarcane,with the highest expression in leaf sheath and the lowest in root. Besides,the expression of ScSOS1gene could beregulatedby the treatments of NaCl, PEG, ABA, SA,and MeJA,and up-regulatedby the stresses of NaCland PEG, with the highest inducible expression levels of1.5 times and 4.0 times ashigh as those of control at 24 hours, respectively. This paper suggested that ScSOS1involves in sugarcane tolerance salt and osmotic stresses. It can set up a basis for the elucidation of sugarcane salt resistancemechanism.

Key words: Sugarcane, SOS1gene, in silico cloning, Bioinformatics, Real-time quantitative PCR

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