Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (1): 187-194.DOI: 10.1016/j.jia.2023.05.027

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宿主诱导的MpPar6沉默提高转基因油菜对桃蚜的抗性

  

  • 收稿日期:2023-02-01 接受日期:2023-03-21 出版日期:2024-01-20 发布日期:2024-01-06

Host-induced silencing of MpPar6 confers Myzus persicae resistance in transgenic rape plants

Qi Zhang1, Wenqin Zhan1, Chao Li2, Ling Chang1, Yi Dong1#, Jiang Zhang1, 3#    

  1. 1 State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China

    2 Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China

    3Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518000, China

  • Received:2023-02-01 Accepted:2023-03-21 Online:2024-01-20 Published:2024-01-06
  • About author:#Correspondence DONG Yi, E-mail: 20180140@hubu.edu.cn; ZHANG Jiang, E-mail: zhangjiang@hubu.edu.cn
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (32102297 and 32272634).  

摘要:

植物介导的RNA干扰(RNAi)是一种很有前途的虫防治技术桃蚜Myzus persicae400多种寄主植物为食。油菜是世界上第二重要的油料作物。由于桃蚜繁殖能力生活史多变,对油菜生长造成了严重的危害。在本研究中,我们测试了转基因油菜植物介导RNAi对桃蚜抗性。通过体外喂食含有7个蚜虫关键基因的双链RNA (dsRNAs)的人工饲料,我们发现了一个编码分离缺陷蛋白6 (Par6的新基因是有效的RNAi靶点。组织和龄期表达分析表明,该基因在桃蚜胚期和成虫期均有高表达。接下来,我们通过农杆菌介导转化获得了表达dsPar6的转基因油菜植株,得9个独立的转基因事件。与野生型对照植物相比,表达dsPar6的转基因油菜株系对桃蚜表现出较显著的抗性。取食实验表明,将转基因油菜植株饲喂桃蚜后,MpPar6的表达水平和成活率显著降低,蚜虫繁殖力受损。此外,我们还发现转基因油菜对桃蚜的抗性水平与dsPar6表达水平呈正相关。我们的研究表明,转基因油菜表达dsPar6能够有效地保护其免受桃蚜的侵害。参与胚胎发育的基因可能是控制蚜虫和其他害虫的有效RNAi靶点。

Abstract:

Plant-mediated RNA interference (RNAi) has emerged as a promising technology for insect control.  The green peach aphid, Myzus persicae, feeds on over 400 species of host plants.  Brassica napus (rape) is the second most important oilseed crop worldwide.  Myzus persicae is highly reproductive and causes severe damage to the rape plants due to its quite flexible life cycle.  In this study, we tested the RNAi effects of transgenic rape plants on Mpersicae.  By in vitro feeding M. persicae with artificial diets containing double-stranded RNAs (dsRNAs) targeting seven aphid genes, we identified a new gene encoding the partitioning-defective protein 6 (Par6) as the most potent RNAi target.  Tissue- and stage-expression analysis of Par6 suggested this gene is highly expressed in the embryo and adult stage of Mpersicae.  We next generated transgenic rape plants expressing dsPar6 by Agrobacterium-mediated transformation and obtained nine independent transgenic lines.  Compared to wild-type control plants, transgenic rape lines expressing dsPar6 showed strong resistance to Mpersicae.  Feeding assays revealed that feeding transgenic rape plants to Mpersicae significantly decreased MpPar6 expression and survival rate and impaired fecundity.  Furthermore, we showed that the resistance levels to Mpersicae are positively correlated with dsPar6 expression levels in transgenic rape plants.  Our study demonstrates that transgenic rape plants expressing dsPar6 are efficiently protected from Mpersicae.  Interfering with the genes involved in embryo development could be the effective RNAi targets for controlling aphids and potentially other insect pests.

Key words: oilseed rape ,  pest control ,  aphid ,  double-stranded RNA ,  RNA interference