Molecular characterization and function analysis of SlNAC2 in Suaeda liaotungensis K.

Molecular characterization and function analysis of SlNAC2 in Suaeda liaotungensis K.
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辽东碱蓬SlNAC2的分子表征及功能分析。

DOI:
10.1016/j.gene.2014.04.025
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发表时间:
2014-06
期刊:
影响因子:
3.5
通讯作者:
Li, Qiu-Li
Li, Qiu-Li
中科院分区:
生物学3区
文献类型:
--
作者:
Yang, Xing;Hu, Yu-Xin;Li, Xiao-Lan;Yu, Xiao-Dong;Li, Qiu-Li

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植物特有的NAC(NAM、ATAF1/2和CUC)转录因子在植物发育和逆境响应中具有不同的作用。在本研究中,从苏打大麦的Solexa高通量测序中分离到了一个胁迫响应NAC2基因,并进行了鉴定。SLNAC2与其他NAC,尤其是ATAF亚组成员有很高的相似性。SLNAC2的转录本存在于包括叶、茎和根在内的许多种子中。特别是SlNAC2基因在叶片中表达较强。表达分析表明,在盐和低温胁迫下,SLNAC2在叶片中高度诱导表达。亚细胞定位显示SLNAC2蛋白定位于细胞核。在酵母中的反式激活实验表明,SlNAC2激活了报告基因的表达。为了验证其功能,在CaMV-35S启动子的控制下,将SlNAC2转化拟南芥。功能分析表明,该基因的过表达增强了植物对盐分胁迫的耐受性。因此,SlNAC2基因在植物中是一个多功能的调节因子,可能是培育耐逆植物遗传改良的一个很好的候选基因。
The plant-specific NAC (NAM, ATAF1/2, and CUC) transcription factors have diverse roles in plant development and stress responses. In this study, a stress-responsiveNACgene,SlNAC2, was isolated and characterized from high-throughput Solexa sequencing ofSuaedaliaotungensis. SlNAC2 showed high similarity to other NACs, especially ATAF subgroup members. Transcripts ofSlNAC2appeared in manySuaedatissues including leaves, stems and roots. In particular,SlNAC2was strongly expressed in leaves. Expression analysis showed thatSlNAC2was highly induced during salt and low temperature stress in leaves. Subcellular localization showed that the SlNAC2 protein localized to the nucleus. A transactivation assay in yeast demonstrated that SlNAC2 activated the expression of a reporter gene. To test its function,SlNAC2was transformed into Arabidopsis under the control of the CaMV-35S promoter. Functional analysis showed that its overexpression resulted in enhanced tolerance to salinity stress. Therefore,SlNAC2is a multifunctional regulatory factor in plants, and might be a good candidate gene for genetic improvement to produce stress tolerant plants.
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