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园艺学报 ›› 2022, Vol. 49 ›› Issue (8): 1747-1760.doi: 10.16420/j.issn.0513-353x.2021-0562

• 研究论文 • 上一篇    下一篇

千层金MbEGS基因的克隆与功能分析

邱子文1,3, 刘林敏1, 林永盛1, 林晓洁1, 李永裕1,2,*(), 吴少华1,2,*(), 杨超1,2,*()   

  1. 1.福建农林大学园艺学院,福州 350002
    2.福建农林大学园艺植物天然产物研究所,福州 350002
    3.广东省潮州市农业科技发展中心,广东潮州 521000
  • 收稿日期:2021-11-07 修回日期:2022-03-24 出版日期:2022-08-25 发布日期:2022-09-05
  • 通讯作者: 李永裕,吴少华,杨超 E-mail:lilin3182@163.com;348279953@qq.com;55753827@qq.com
  • 基金资助:
    国家自然科学基金项目(31902067);国家自然科学基金项目(31501694);福建省自然科学基金项目(2022J01138);福建省科技计划项目(2018N0003);福建农林大学科技创新专项基金项目(CXZX2017171)

Cloning and Functional Analysis of the MbEGS Gene from Melaleuca bracteata

QIU Ziwen1,3, LIU Linmin1, LIN Yongsheng1, LIN Xiaojie1, LI Yongyu1,2,*(), WU Shaohua1,2,*(), YANG Chao1,2,*()   

  1. 1. College of Horticulture,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    2. Institute of Natural Products of Horticultural Plants,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    3. Agricultural Science and Technology Development Center of Chaozhou in Guangdong Province,Chaozhou,Guangodng 521000,China
  • Received:2021-11-07 Revised:2022-03-24 Online:2022-08-25 Published:2022-09-05
  • Contact: LI Yongyu,WU Shaohua,YANG Chao E-mail:lilin3182@163.com;348279953@qq.com;55753827@qq.com

摘要:

在前期构建的千层金(Melaleuca bracteata)转录组数据库中鉴定并克隆得到2个丁香酚合成酶基因MbEGS1MbEGS2,基因编码区(coding sequences,CDs)序列长度分别为963 和972 bp,分别编码320和323个氨基酸。序列比对和系统进化树分析表明,MbEGS1、MbEGS2与仙女扇(Clarkia breweri)CbIGS1蛋白序列相似性最高,达到65.92%和63.89%。qRT-PCR分析表明,二者在千层金的花、叶片和茎中均有表达,其中在花中表达量最高,叶中次之,茎中最低,与不同组织中丁香酚含量的变化类似,基因表达量与丁香酚含量呈显著正相关;MbEGS1在千层金的根中有表达,且表达量高于茎段,但低于叶片,而MbEGS2在根中不表达。采用不同浓度MeJA处理千层金发现,MeJA能够诱导MbEGS1MbEGS2表达和丁香酚合成,0.1 mmol · L-1 MeJA诱导效果最显著,其转录水平与丁香酚含量呈正相关。亚细胞定位结果表明,MbEGS1主要定位于细胞质膜和细胞核中,MbEGS2主要定位于细胞质膜中。在森林草莓中异位表达MbEGS1MbEGS2的结果表明,过表达MbEGS1MbEGS2促进了丁香酚含量的增加。以上结果表明,二者均参与了丁香酚的生物合成。

关键词: 千层金, 丁香酚合成酶, 基因克隆, 表达分析, 功能鉴定

Abstract:

Melaleuca bracteata is rich in essential oil,the main component of which is methyl eugenol with the content is as high as 86.5%. Eugenol is the precursor for the synthesis of methyl eugenol,but the biosynthetic pathway of essential oil is not clear. Based on the transcriptome databases of Melaleuca bracteata,two eugenol synthase genes(MbEGS1 and MbEGS2)were identified and cloned from Melaleuca bracteata. The coding sequences(CDS)of MbEGS1 and MbEGS2 were 963 and 972 bp in length,encoding 320 and 323 amino acids,respectively. Multiple sequence alignment and phylogenetic tree analysis showed that the deduced proteins MbEGS1 and MbEGS2 had the highest similarity (65.92% and 63.89%)with CbIGS1. qRT-PCR analysis showed that MbEGS1 and MbEGS2 were expressed in flowers,leaves and stems of Melaleuca bracteata. The highest expression level was observed in flowers,followed by leaves and stems,which was similar to the eugenol content in different tissues of Melaleuca bracteata,showing a significant positive correlation between the gene expression and eugenol content. MbEGS1 was expressed in roots of Melaleuca bracteata,and the expression level was higher than that in stems and lower than that in leaves. However,MbEGS2 was not expressed in roots. When MeJA was used to treat Melaleuca bracteata,MeJA could induce the expression of MbEGS1 and MbEGS2 and eugenol synthesis,which showed a trend of first increase and then decrease. Treatment with MeJA at 0.1 mmol · L-1 had the most significant effect on gene expression,and their transcription levels were positively correlated with the eugenol content. Subcellular localization showed that MbEGS1 was mainly located in plant cell membrane and nucleus,and MbEGS2 was mainly located in plant cell membrane. Ectopic expression of MbEGS1 and MbEGS2 showed that overexpression of MbEGS1 and MbEGS2 promoted the synthesis of eugenol in Fragaria vesca(Yellow Wonder). The results show that both MbEGS1 and MbEGS2 genes are involved in eugenol biosynthesis.

Key words: Melaleuca bracteata, eugenol synthase, gene cloning, expression analysis, functional identification

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