遗传 ›› 2020, Vol. 42 ›› Issue (2): 194-211.doi: 10.16288/j.yczz.19-250

• 研究报告 • 上一篇    下一篇

互花米草NAC转录因子家族的鉴定与表达分析

王涛涛1,2(), 杨勇1,2, 魏唯2, 林辰涛2, 马留银2()   

  1. 1. 福建农林大学林学院,福州 350002
    2. 福建农林大学基础林学与蛋白质组学研究中心,福州 350002
  • 收稿日期:2019-08-27 修回日期:2019-12-26 出版日期:2020-02-21 发布日期:2020-02-08
  • 基金资助:
    福建农林大学林学高峰学科建设项目(71201800725);福建农林大学林学高峰学科建设项目(71201800773);福建农林大学优秀博士学位论文基金项目(324-1122yb043)

Identification and expression analyses of the NAC transcription factor family in Spartina alterniflora

Taotao Wang1,2(), Yong Yang1,2, Wei Wei2, Chentao Lin2, Liuyin Ma2()   

  1. 1. College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    2. Basic Forestry and Proteomics Research Center, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2019-08-27 Revised:2019-12-26 Online:2020-02-21 Published:2020-02-08
  • Supported by:
    Peak Subject Construction Project of Fujian Agricultural and Forestry University(71201800725);Peak Subject Construction Project of Fujian Agricultural and Forestry University(71201800773);Scientific Research Foundation of the Graduate School of Fujian Agriculture and Forestry University(324-1122yb043)

摘要:

互花米草(Spartina alterniflora)作为一种海岸带盐生植物,高度耐盐胁迫,但因为缺少参考基因组,其耐盐的分子机制却尚未见报道。NAC家族蛋白是植物特有的转录因子,调控植物的生长发育和胁迫应答。为了鉴定互花米草NAC蛋白(SaNAC)并探究它们与互花米草生长发育及胁迫响应之间的关系,本研究以互花米草三代全长转录组数据为参考,通过与水稻(Oryza sativa)、拟南芥(Arabidopsis thaliana)和玉米(Zea mays)NAC蛋白序列进行比对,并结合保守功能域进一步筛选,最终找到62个SaNAC蛋白。从蛋白序列比对、进化、motif预测、同源性比较、亚细胞定位、组织表达以及非生物胁迫下的基因差异表达等方面分别对互花米草NAC家族成员进行分析,结果发现SaNAC蛋白均含有保守的NAM结构域,且在进化上与水稻NAC家族具有一定的相似性;SaNAC家族中的两个蛋白SaNAC9和SaNAC49在细胞核表达;另外,本研究还发现互花米草SaNAC基因表达具有高度组织和胁迫应答差异性。这些结果表明互花米草NAC转录因子家族不仅具有保守的功能域,而且在调控互花米草的生长发育和非生物胁迫响应过程中具有重要的作用。

关键词: 互花米草, NAC, 转录因子, 基因家族, 基因表达

Abstract:

As a coastal halophyte, Spartina alterniflora has high salt tolerance. However, the mechanism at the molecular level has not been widely studied due to the absence of a reference genome. The proteins of NAC families are plant-specific transcription factors that regulate the growth, development and stress response in plants. To identify the NAC family and explore the relationship between NAC proteins and the growth, development and stress response of Spatina alterniflora, full-length transcriptome data of Spartina alterniflora by the third generation sequencing technology was used as reference sequences in this study to blast with the NAC protein sequences from Oryza sativa, Arabidopsis thaliana and Zea mays. Finally, 62 SaNAC proteins were found in Spartina alterniflora by deep analysis on conserved domains. Then we analyzed sequence alignment, evolution, motif prediction, homology comparison, subcellular localization, tissue and abiotic stress-induced gene differential expression profile on the NAC family members in Spartina alterniflora. As a result, all SaNAC proteins were found containing a conserved NAM domain and having certain evolutionary similarity with rice; two family proteins, SaNAC9 and SaNAC49, were expressed in the nucleus; moreover, SaNAC genes were identified to have distinct expressional profiles in different tissues and stress response of Spartina alterniflora. These results indicated the SaNAC transcription factor family not only had conserved functional domains but also played important role in the regulation of growth, development and abiotic stress response.

Key words: Spartina alterniflora, NAC, transcription factor, gene family, gene expression