蔗茅EfMYB1基因的克隆与表达分析
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国家自然科学基金(31960451,31560417);


Molecular Cloning and Expression Analysis of EfMYB1 in Erianthus fulvus
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    摘要:

    为了充分利用蔗茅(Erianthus fulvus)野生资源,挖掘其优良的抗性基因,丰富转基因甘蔗育种候选基因库,该研究结合蔗茅转录组数据,以蔗茅991无性系为试验材料,利用RTPCR技术克隆蔗茅MYB基因,并对其进行生物信息学分析及胁迫表达分析,以解析蔗茅的耐寒机理,为转基因甘蔗育种奠定理论基础。结果表明:(1)成功克隆得到一个蔗茅MYB基因,命名为EfMYB1基因(登录号ON586646)。(2)生物信息学分析表明,EfMYB1基因全长1 000 bp,ORF为759 bp,编码251个氨基酸;编码蛋白具有一个保守的SANT结构域,无跨膜结构和信号肽,有多个磷酸化位点;二级结构与三级结构主要以α螺旋和无规则卷曲为主;与南荻相似性最高,遗传距离最近。(3)qRTPCR分析结果发现,EfMYB1基因在蔗茅根和叶组织中的相对表达量随低温胁迫时间的持续而逐渐显著上调,并于胁迫72 h时达到最大值,而在茎中的表达则几乎没有变化;茉莉酸甲酯胁迫下,EfMYB1基因的相对表达量呈先升高后降低的趋势,且在处理6 h时达到最高值;脱落酸胁迫下EfMYB1基因的表达水平较0 h时极显著降低。研究认为,EfMYB1基因属于低温胁迫响应基因,可能参与蔗茅低温胁迫下的应答反应。

    Abstract:

    In order to make full use of the wild resources of Erianthus fulvus and mining valuable resistance genes to enrich the candidate gene library of transgenic sugarcane breeding, we cloned MYB gene from E. fulvus ‘991’ by combined with the transcriptome analysis and RTPCR technology. We also curried out bioinformatics analysis and stress expression analysis. This study provided theoretical foundation for further analysis cold tolerance mechanism of E. fulvus and transgenic sugarcane breeding. The results showed that: (1) E. fulvus MYB was successfully cloned and named EfMYB1(GeneBank ID: ON586646). (2) Bioinformatics analysis showed that the full length of EfMYB1 gene was 1 000 bp, had an ORF with 759 bp and encoded 251 amino acids. The EfMYB1 protein has a conserved SANT domain and multiple phosphorylation sites, and no transmembrane structure and signal peptide. The secondary structure and tertiary structure of EfMYB1 protein were mainly αhelix and random coil. EfMYB1 protein has the highest similarity and closest genetic distance with MYB of Miscanthus lutarioriparius. (3) The results of qRTPCR analysis showed that the relative expression level of EfMYB1 gene were gradually increased with continuous low temperature stress in root and leaf tissues of E. fulvus, and reached the largest level at 72 h, while almost unchanged in stem. In addition, EfMYB1 gene expression was induced by Methyl Jasmonate (MeJA) treatment, and reached the highest value at 6 h. But the expression level of this gene was significantly decreased under Abscisic acid (ABA) treatment. This study demonstrated that EfMYB1 gene belongs to low temperature stress response gene and may be involved in E. fulvus response low temperature stress.

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饶席兵,钱禛锋,张蓉琼,等.蔗茅EfMYB1基因的克隆与表达分析[J].西北植物学报,2022,43(9):1487-1494

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  • 收稿日期:2022-10-25
  • 最后修改日期:2022-10-30
  • 录用日期:2023-07-05
  • 在线发布日期: 2023-09-08
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