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园艺学报 ›› 2007, Vol. 34 ›› Issue (3): 649-654.

• 蔬菜 • 上一篇    下一篇

cDNA文库与RACE方法结合克隆马铃薯DnaJ -like基因全长cDNA

李广存1,2; 金黎平1 ; 王晓武1 ; 谢开云1 ; 谢丙炎1 ; 屈冬玉1*
  

  1. (1 中国农业科学院蔬菜花卉研究所, 北京100081; 2 山东省农业科学院高新技术研究中心, 济南250100)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-06-25 发布日期:2007-06-25

Clon ing of DnaJ-like Gene cDNA in Diploid Pota to Using RACE MethodsCombined with cDNA Library

LI Guang-cun1,2 ; JIN Li-ping1; WANG Xiao-wu1 ;XIE Kai-yun1 ; XIE Bing-yan1 ;QU Dong-yu1*

  

  1. (1 Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2High-Tech ResearchCenter, Shandong Academy of Agricultural Sciences, Jipnan 250100, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-06-25 Published:2007-06-25

摘要: 以青枯病菌小种3号(生化变种2) PO41诱导24 h和48 h的马铃薯抗青枯病基因型ED13叶
片为材料, 应用SMART技术构建了一个富集青枯病抗性相关基因的cDNA文库。继而利用RACE技术与该
cDNA文库相结合克隆了一个马铃薯分子伴侣基因的全长cDNA。该cDNA长735 bp, 5′端有25 bp的非翻译
区, 3′端具有完整的polyA 尾, 包含一个编码177 个氨基酸的完整开放阅读框架( GenBank 登录号:
DQ885360) 。该分子伴侣基因与拟南芥DnaJ-like 20的部分核苷酸序列具有84%的一致性, 与其编码的氨基
酸序列具有59%的一致性, 暂命名为StDnaJ。目前在马铃薯中尚未发现与之同源的已知基因。半定量RT
PCR结果表明, 该基因同时受青枯病菌的诱导和茉莉酸的调节, 可能在青枯病菌和茉莉酸胁迫下具有促使
胁迫损害细胞恢复活性的功能。

关键词: 马铃薯, cDNA文库, RACE, DnaJ-like基因

Abstract: A cDNA library, enriched with full-length resistance-related genes, was constructed by
SMART ( Switching mechanism at 5′end of RNA transcrip t) technique using dip loid potato leaves infected
with race 3 (Biovar 2) PO41 of Ralston ia solanacearum for 24 h and 48 h. A full2length cDNA of DnaJ-like
homolog with comp leted open reading frame of 177 amino acids was cloned from potato using the strategy of
RACE ( rapidamp lification of cDNA ends) combined with cDNA library. This cDNA homologwas designated
as S tDnaJ , which contains 735 bp with an un-translated region of 25 bp at its 5′end and a polyA tail at the 3′
end (GenBank accession number: DQ885360). BLAST search against NCBI showed that the S tDnaJ gene
shared 84% identity with DnaJ-like 20 of A rabidopsis thaliana in nucleotide and 59% in amino acid, but no
similar genes have been reported from potatoes in the NCBI database. Analysis of semi-quantitative RT-PCR
indicated that this gene was induced by Ralston ia solanacea rum as well as up-regulated by jasmonic acid
(JA). That suggests S tDnaJ gene mayplay a role in recovering the activity of p rotein destroyed by R. so
lanacearum or Jasmonic acid (JA) stress.

Key words: Potato, cDNA library, RACE, DnaJ-like gene