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园艺学报 ›› 2014, Vol. 41 ›› Issue (1): 89-98.

• 蔬菜 • 上一篇    下一篇

茎瘤芥AP2/EREBP 转录因子基因BjABR1 的克隆和表达分析

向浏欣1,2,夏玉先1,蔡应繁3,*,付于银2,王小艳2,刘吉军2   

  1. 1 重庆大学基因工程研究中心,重庆 400030;2 重庆邮电大学生物信息学院,重庆 400065;3 河南大学生命科学学
    院,棉花生物学国家重点实验室,河南开封 475001
  • 出版日期:2014-01-25 发布日期:2014-01-25
  • 基金资助:

    国家自然科学基金项目(31071461);重庆市科技攻关项目(CSTC,201lAB1095);重庆市自然科学基金项目(CSTC,
    2011AB1095);重庆市教委科学技术研究项目(CSTC,KJ130510,KJ110506,KJ130509,KJ130502)

Cloning and Expression Analysis of an AP2/EREBP Transcription Factor Gene BjABR1 in Brassica juncea var. tumida

XIANG Liu-xin1,2,XIA Yu-xian1,CAI Ying-fan3,*,FU Yu-yin2,WANG Xiao-yan2,and LIU Ji-jun2   

  1. 1Genetic Engineering Research Center,Chongqing University,Chongqing 400030,China;2College of Bioinformation,
    Chongqing University of Posts and Telecommunications,Chongqing 400065,China;3State Key Laboratory of Cotton
    Biology,College of Life Science,Henan University,Kaifeng,Henan 475001,China
  • Online:2014-01-25 Published:2014-01-25

摘要: 以茎瘤芥(Brassica juncea var. tumida Tsen et Lee)‘永安’为材料,通过RACE 和RT-PCR
技术得到1 个AP2/EREBP 转录因子基因的cDNA 全长序列和基因组DNA(gDNA)序列,该基因与拟南
芥AtABR1 基因的氨基酸序列相似性高达72%,因此命名为BjABR1(GenBank 登录号:JQ713825.1)。BjABR1
基因gDNA 序列含1 个内含子;cDNA 序列全长1 514 bp,含有1 个1 146 bp 的开放阅读框(ORF),编
码381 个氨基酸;其推定编码的蛋白分子量为41.674 kD,等电点为9.11,具有14 个磷酸化位点,含1
个典型的AP2 DNA 结合域和1 个CMX-1 基序。洋葱表皮细胞的瞬时表达显示,BjABR1 蛋白定位于细
胞核。荧光定量PCR 分析结果表明,该基因在茎瘤芥不同发育时期的根、茎、叶中均有表达,但在根中
表达量极高;在对茎瘤芥组培幼苗进行高盐、渗透压和低温3 种非生物胁迫处理后发现,3 种胁迫均能诱
导该基因表达,但其对高盐的响应更为迅速。

关键词: BjABR1, 茎瘤芥, 基因克隆, 表达分析, 转录因子

Abstract: The full length cDNA sequence and genomic DNA(gDNA)sequence of an AP2/EREBP
transcription factor family gene were cloned from Brassica juncea var. tumida Tsen et Lee‘Yong’an’by
RACE(rapid amplification of cDNA ends)and RT-PCR. Amino acid sequence alignment showed the gene
shared 72% similarity with a known Arabidopsis thaliana AP2/EREBP family gene,AtABR1,named after
BjABR1(GenBank accession No. JQ713825.1). BjABR1 gene contained one intron and putatively encoded
381 amino acids with the protein molecular mass of 41.674 kD,the pI of 9.11,14 phosphorylation sites
and an AP2 DNA-bind domain and a CMX-1 motif. Subcellular localization assays showed that the BjABR1 protein appeared in the nucleus. Quantitative real-time PCR analysis revealed that BjABR1 gene
was expressed in root,stem and leaf,and highest in the root. The expression of BjABR1 was inducible
under salt stress,osmotic stress and cold stress,and its transcriptional responses subject to salinity was
most sensitive.

Key words: BjABR1, Brassica juncea, gene cloning, expression analysis, transcription factor

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