浙江农业学报 ›› 2022, Vol. 34 ›› Issue (4): 766-780.DOI: 10.3969/j.issn.1004-1524.2022.04.13

• 园艺科学 • 上一篇    下一篇

桃NAC家族基因生物信息学分析及其响应低温胁迫的表达特征

李小兰1(), 张瑞1, 郝兰兰1, 王鸿1,2,*()   

  1. 1.甘肃农业大学 园艺学院,甘肃 兰州 730070
    2.甘肃省农业科学院 林果花卉研究所,甘肃 兰州 730070
  • 收稿日期:2021-07-26 出版日期:2022-04-25 发布日期:2022-04-28
  • 通讯作者: 王鸿
  • 作者简介:*王鸿,E-mail: wrh991130@126.com
    李小兰(1996—),女,甘肃定西人,硕士研究生,研究方向为果树遗传育种。E-mail: 2495318239@qq.com
  • 基金资助:
    国家自然科学基金(31760558);国家现代农业产业技术体系(CARS30-1-6)

Bioinformatics analysis of peach NAC gene family and its expression characteristics in response to low temperature stress

LI Xiaolan1(), ZHANG Rui1, HAO Lanlan1, WANG Hong1,2,*()   

  1. 1. College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China
    2. Institute of Fruit and Floriculture Research, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China
  • Received:2021-07-26 Online:2022-04-25 Published:2022-04-28
  • Contact: WANG Hong

摘要:

NAC(NAM-ATAF1/2-CUC2)是植物特有的具有多种生物功能的一类重要转录因子,在植物应对非生物胁迫、激素信号应答与器官形成中发挥重要作用。为了解桃NAC蛋白(PpNAC)及其在桃低温胁迫过程中的响应,采用生物信息学方法和qRT-PCR系统分析了桃NAC家族基因的成员、结构、功能和低温胁迫下的表达。结果表明,桃NAC家族共有119个成员,命名为PpNAC001~PpNAC119。PpNACs的氨基酸长度在68~862 aa,平均氨基酸长度为352 aa,分子量为7.2~96.1ku,等电点为4.3~9.5。除PpNAC119定位在染色体骨架上之外,其余基因均定位在桃的8条染色体上。基因结构和保守基序分析表明,位于同一亚族的成员基因结构相似,外显子数量和长度基本相同,并且同一亚族中的成员所含motif的种类和排列顺序基本相似,推测同一亚族的成员可能具有相同的功能,而不同亚族之间的差异可能与他们的功能特异性有关。对PpNACs蛋白启动子区2 000 bp的序列进行顺式作用元件分析,结果表明,脱落酸响应原件、光响应原件、茉莉酸甲酯响应原件、赤霉素响应原件、低温响应原件和生长素响应原件在筛选到的所有原件中占比较大。qRT-PCR结果显示,在4 ℃低温胁迫2、6 h,部分基因表达量上调不明显;低温胁迫12 h,16个NAC基因的表达量均显著上调。

关键词: NAC转录因子, 桃, 低温胁迫, 生物信息学

Abstract:

NAC (NAM-ATAF1/2-CUC2) are transcription factors with multiple biological functions,they play an important role in plant response to abiotic stress, hormone signal response and organ formation.In order to understand peach NAC protein (PpNAC) and its response during low temperature stress, the members, structure, function and expression of peach NAC family gene under low temperature stress were analyzed by bioinformatics and qRT-PCR.The results showed that there were 119 members in NAC family of peach, named as PpNAC001- PpNAC119. The amino acid length of PpNACs ranged from 68 to 862, with an average of 352 aa. Molecular weight ranged from 7.2 to 96.1 ku, and isoelectric point ranged from 4.3 to 9.5. Except for PpNAC119, the rest genes were located on eight chromosomes of peach. The analysis of gene structure and conserved motif showed that gene structure of the members in the same subgroup was similar, the number and length of exons were basically the same, and types and sequence of motifs contained in the members in the same subgroup were similar. The differences among different subgroups might be related to their functional specificity. The cis-acting elements in 2 000 bp sequence of PpNACs promoter was analyzed. The results showed that abscisic acid responsive, light responsive, MeJA-responsive, low-temperature responsive and auxin responsive elements accounted for a large proportion of all the selected elements. qRT-PCR analysis showed that the expression level of some genes was not significantly up-regulated compared with the control under 4 ℃ low temperature stress for 2 and 6 h.The expression levels of 16 NAC genes were significantly up-regulated after 12 h of low temperature stress.

Key words: NAC transcription factor, peach, low temperature stress, bioinformatics

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