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园艺学报 ›› 2017, Vol. 44 ›› Issue (7): 1251-1262.doi: 10.16420/j.issn.0513-353x.2016-0950

• 研究论文 • 上一篇    下一篇

豆梨NAC 转录因子基因PcNAC1 的克隆、亚细胞定位及功能初探

阚家亮1,2,马 娜2,王 彤3,刘廷利3,王金彦3,杨郁文3,蔺 经2,*,常有宏2,*   

  1. 1 南京农业大学园艺学院,南京 210095;2 江苏省农业科学院果树研究所,南京 210014;3 江苏省农业科学院生物
    技术研究所,南京 210014
  • 出版日期:2017-07-25 发布日期:2017-07-25

Cloning,Sub-cellular Localization and Functional Analysis of the PcNAC1 Gene with NAC Transcription Factor from Pyrus calleryana

KAN Jialiang1,2,MA Na2,WANG Tong3,LIU Tingli3,WANG Jinyan3,YANG Yuwen3,LIN Jing2,*,and CHANG Youhong2,*   

  1. 1College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China;2Institute of Pomology,Jiangsu
    Academy of Agricultural Sciences,Nanjing 210014,China;3Institute of Biotechnology,Jiangsu Academy of Agricultural
    Sciences,Nanjing 210014,China
  • Online:2017-07-25 Published:2017-07-25

摘要:

根据豆梨(Pyrus calleryana Dence)接种黑斑病菌后的转录组测序结果,筛选出一个上调表
达的NAC 转录因子基因。从豆梨中获得了该基因的全长片段,并将其命名为PcNAC1。该基因的开放阅
读框为792 bp,编码263 个氨基酸。将PcNAC1 蛋白序列与其他物种蛋白序列进行对比,并构建系统进
化树后发现,其与小麦TaNAC4 及拟南芥ATAF1 具有较高同源性。通过实时荧光定量分析PcNAC1 在豆
梨不同组中的表达发现,PcNAC1 在茎、叶和根中表达量较高,在花和果中表达量较低。构建了亚细胞定
位载体,瞬时侵染本氏烟,通过激光共聚焦显微镜观察融合蛋白在细胞内的分布情况,发现该基因行使
功能的主要区域定位在细胞核。进一步在本氏烟中瞬时表达PcNAC1,接种烟草疫霉病菌后发现PcNAC1
可以通过调控植物激素通路防卫反应基因的表达来增强植物的抗病性。

关键词: 豆梨, 黑斑病, NAC 转录因子, 亚细胞定位, 防卫反应

Abstract:

Up-regulated expression NAC transcription factor was selected from transcriptome
sequencing data of Pyrus calleryana Decne infected by Pear black spot. Full length gene was polymerized
and entitled as PcNAC1. The open reading frame(ORF)consists on 792 bp nucleotides encoding 263
amino acids polypeptide. Comparison of PcNAC1 with peptide sequences of NAC transcription factors
protein family and phylogenetic analysis revealed the highest homology of PcNAC1 with TaNAC4 in
Triticum aestivu and ATAF1 in Arabidopsis thaliana. It revealed by Quantitative Real-time PCR that the expression of PcNAC1 was high in stem,leaf and root of Pyrus calleryana Decne but very low expression
in flower and fruit. We synthesized a sub-cellular localization vector to get the transient expression in
Nicotiana benthamiana. By confocal laser scanning microscopy it was observed that the fusion protein was
localized in nucleus. Furthermore,we infected transgenic Nicotiana benthamiana with Phytophthora
parasitica,it was obvious that PcNAC1 enhanced the disease resistance in plant by triggering the
expression of pathways of defense response plant hormone genes.

Key words: Pyrus calleryana, Pear black spot, NAC transcription factor, sub-cellular localization, defense response