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黄梁木WOX基因家族的鉴定与表达分析

Identification and Expression Analysis of WOX Gene Family in Neolamarckia cadamba

  • 摘要: WOX (WUSCHEL-related homebox)转录因子在调节植物生长发育和响应非生物胁迫中起着重要作用。为揭示华南地区重要速生树种黄梁木(Neolamarckia cadamba)WOX基因家族的功能,本研究利用生物信息学方法对黄梁木WOX基因进行全基因组鉴定,并对其理化性质、蛋白质结构、染色体定位、系统进化、基因表达模式以及启动子顺式元件进行分析。结果表明:黄梁木中共有19个WOX基因,分布在14条染色体上;NcWOX家族成员分为WUS进化支、中间进化支和古代进化支,均具有高度保守的同源结构域。基因表达模式分析表明,NcWOX4.1、NcWOX4.2、NcWOX13.1以及NcWOX13.2在茎的维管组织中表达量较高,其中NcWOX4.1、NcWOX4.2在初生生长向次生生长转换期的形成层表达量最高,推测NcWOX4.1、NcWOX4.2、NcWOX13.1和NcWOX13.2参与黄梁木维管发育。启动子顺式作用元件分析表明,NcWOX基因家族成员的启动子具有丰富的光应答、激素应答以及逆境反应元件。本研究为深入研究NcWOX基因在黄梁木生长发育及逆境响应中的作用奠定了重要基础。

     

    Abstract: WOX(WUSCHEL-related homebox), an unique type of transcription factors in plant, plays signi-ficant roles in regulating plant growth and development and the response to abiotic stress. Neolamarckia cadamba is an important fast-growing tree species in South China with high economic value. In order to characterize the functions of WOX in N.cadamba, genome-wide analysis of WOX gene family was conducted in this study using bioinformatic method. The results showed that a total of 19 NcWOX genes was identified and their protein-related information, gene structure, chromosome distribution, phylogenetic relationship and gene expression patterns were subsequently analyzed. The NcWOX genes were distributed across 14 chromosomes, and their proteins were divided into three groups by phylogenetic tree, including WUS clade, intermediate clade and ancient clade. Multiple sequence analysis of the NcWOX gene family reveals a highly conserved homeodomain. Expression profile analysis shows that NcWOX4.1、 NcWOX4.2、 NcWOX13.1 and NcWOX13.2 have high expression levels in vascular. Particularly, NcWOX4.1、 NcWOX4.2 exhibited the highest expression levels in TCA(transition phase of cambium). These results indicated that NcWOX4.1、 NcWOX4.2、 NcWOX13.1 and NcWOX13.2 might be involved in vascular development in N. cadamba. Analysis of the promoter elements of the NcWOXs showed that there were rich ele-ments in response to light, hormone and stress. Collectively, identification and preliminarily analysis of WOX gene family members in N. cadamba has been conducted in present study, which lay a theoretical basis for the further functional investigation of NcWOX genes in N. cadamba.

     

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