越橘VcNAC072克隆及其促进花青素积累的功能分析

doi:10.3864/j.issn.0578-1752.2019.03.010

摘要/Abstract

摘要：

目的分离越橘VcNAC072（NAM,ATAF1/2,CUC2）转录因子,分析其表达模式并探讨其在调控花青素合成过程中的功能,为进一步研究越橘花青素积累的调控机理提供理论基础。方法以‘公爵’越橘（Vaccinium corymbosum ‘Duke’）为试材,克隆VcNAC072。通过农杆菌介导法获得转基因拟南芥,比较转基因和野生型拟南芥花青素积累的差异。利用酵母单杂交和瞬时表达试验,分析VcNAC072对MYB转录因子AtPAP1的转录调控。结果克隆获得越橘VcNAC072,该基因CDS为1 032 bp,编码含有343个氨基酸的蛋白质,含有1个保守的NAC结构域。表达分析显示,该基因在不同发育阶段的果实中均可表达,但表达差异明显,在粉色和蓝色果实中表达量较高,在绿色果实中表达量最低。随着VcNAC072表达的升高,果实中花青素含量呈递增的趋势。分析AtPAP1启动子序列,发现其序列中包含NAC转录因子的结合位点。酵母单杂交和烟草瞬时表达试验结果表明,VcNAC072可与AtPAP1的启动子相互作用,并激活其表达。在野生型拟南芥中异位表达VcNAC072,其种子中花青素积累量显著高于野生型。结论推测VcNAC072在越橘果实中正向调节花青素的积累。

关键词: 越橘, NAC转录因子, 花青素, 表达分析, 功能鉴定

Abstract:

【Objective】 The objective of this study was to isolate a transcription factor VcNAC072 (NAM, ATAF1/2, CUC2) from blueberry by PCR technology and studying its expression, and to identify its role in anthocyanin biosynthesis. This study laid the foundation for further study of the molecular mechanism of VcNAC072 affecting anthocyanin biosynthesis in blueberry. 【Method】 The blueberry VcNAC072 gene was cloned by PCR technology from the fruits of blueberry (Vaccinium corymbosum ‘Duke’). The transgenic Arabidopsis thaliana were generated via Agrobacterium-mediated transformation. The differences in the anthocyanin accumulation were compared between transgenic and wild-type Arabidopsis. The yeast one-hybrid (Y1H) and transient expression assays were carried out to test the transcriptional regulation of MYB transcription factor AtPAP1 by VcNAC072. 【Result】 A blueberry VcNAC072 was cloned from blueberry. Sequence analysis showed that the coding domain sequence (CDS) of VcNAC072 was 1 032 bp, which encoded 343 amino acids. Protein structure analysis showed that VcNAC072 contained a NAC domain. Expression analysis showed that VcNAC072 was expressed at different developmental stages of the blueberry fruits. However, the expression levels varied, with the highest expression level in pink fruits and blue fruits and the relatively low transcript levels in green fruits. The content of anthocyanin in fruits was increased with the elevation of relative expression of VcNAC072. The sequence of AtPAP1 promoter was analyzed and a NAC binding motif was found. The VcNAC072 protein could interact with the promoter of AtPAP1. Moreover, the VcNAC072 could induce the expression of AtPAP1 and favorably contributed to anthocyanin accumulation in seeds of transgenic Arabidopsis. 【Conclusion】 It was speculated that VcNAC072 up-regulated anthocyanin accumulation in fruits of blueberry.

Key words: blueberry, NAC transcription factor, anthocyanin, expression analysis, functional identification

宋杨,刘红弟,王海波,张红军,刘凤之. 越橘VcNAC072克隆及其促进花青素积累的功能分析[J]. 中国农业科学, 2019, 52(3): 503-511.

SONG Yang,LIU HongDi,WANG HaiBo,ZHANG HongJun,LIU FengZhi. Molecular Cloning and Functional Characterization of VcNAC072 Reveals Its Involvement in Anthocyanin Accumulation in Blueberry[J]. Scientia Agricultura Sinica, 2019, 52(3): 503-511.

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