中国农业科学 ›› 2005, Vol. 38 ›› Issue (03): 571-575 .

• 园艺 • 上一篇    下一篇

刺梨果实半乳糖内酯脱氢酶基因cDNA片段的克隆及在不同器官的表达

安华明   

  1. 浙江大学园艺系
  • 收稿日期:2004-06-03 修回日期:2004-09-27 出版日期:2005-03-10 发布日期:2005-03-10
  • 通讯作者: 安华明

Cloning of cDNA Fragment of L-Galactono-1,4-Lactone Dehydrogenase and Its Expression in Different Organs of Rosa roxburghii Tratt

  1. 浙江大学园艺系
  • Received:2004-06-03 Revised:2004-09-27 Online:2005-03-10 Published:2005-03-10

摘要: 根据GenBank中登录的拟南芥、花椰菜、甘薯和草莓等植物的半乳糖内酯脱氢酶基因(GalLDH)保守序列设计引物,采用RT-PCR法,从刺梨果实中扩增出该基因的cDNA片段855 bp并测序。序列分析表明,刺梨GalLDH与草莓GalLDH的相似性达92%,与其它植物同源基因的相似性也在80%左右;该片段编码285个氨基酸,推导的氨基酸序列与其它植物同源基因的相似性高达75%~87%。Northern杂交分析表明,该基因在刺梨不同器官中的表达差异明显:在果实内有很高的表达水平,叶内较弱,而在茎和根内只能检测到微弱的信号。这种差异与不同器官中维生素C的积累量高度一致。

关键词: 刺梨, 半乳糖内酯脱氢酶(GalLDH), 维生素C, 克隆, 基因表达

Abstract: 855 bp cDNA encoding L-galactono-1,4-lactone dehydrogenase (GalLDH) fragment was cloned from fruit of Rosa. roxburghii Tratt by the method of RT-PCR on the basis of the homologous genes of Arabidopsis thaliana, cauliflower, sweet potato, strawberry, etc. in GenBank. Sequensing analysis shows that 79%-92% identity in nucleotide sequence and 75%-87% identity in amino acid sequence to that of strawberry and Arabidopsis thaliana, etc. was observed. Northern blot showed that the expression of GalLDH was significantly different in different organs. The transcription level of GalLDH in fruit was significantly higher than that in leaf, stem and root, respectively. Furthermore, this expression mode was highly correlated with AsA levels.

Key words: Rosa roxburghii Tratt, L-galactono-1, 4-lactone dehydrogenase (GalLDH), Ascorbic acid (AsA), Cloning, Gene expression