Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (12): 4136-4146.DOI: 10.1016/j.jia.2024.03.063

所属专题: 昆虫分子生物与功能基因Insect molecular biology

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柑橘木虱囊泡运输相关基因在黄龙病菌侵染中的作用

  

  • 收稿日期:2023-12-12 接受日期:2024-02-21 出版日期:2024-12-20 发布日期:2024-11-18

Vesicular transport-related genes in Diaphorina citri are involved in the process of Candidatus Liberibacter asiaticus infection

Yingzhe Yuan1*, Tao Peng1 2*, Aijun Huang3, Jun He1, Chenyang Yuan4, Tianyuan Liu4, Long Yi3, Xuejin Cui1, Xuefeng Wang1#, Changyong Zhou1#   

  1. 1 National Citrus Engineering and Technology Research Center, Citrus Research Institute, Southwest University, Chongqing 400712, China

    2 College of Life Sciences, Yulin College, Yulin 719000, China

    3 National Navel Orange Engineering Research Center, Gannan Normal University, Ganzhou 341000, China

    4 Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing 400715, China 

  • Received:2023-12-12 Accepted:2024-02-21 Online:2024-12-20 Published:2024-11-18
  • About author:Yingzhe Yuan, Mobile: +86-13139892967, E-mail: yyz9498@email.swu.edu.cn; Tao Peng, Mobile: +86-15320928375, E-mail: ptky2017@sina.com; #Correspondence Xuefeng Wang, Mobile: +86-15922612339, E-mail: wangxuefeng@cric.cn; Changyong Zhou, E-mail: zhoucy@cric.cn * These authors contributed equally to this study.
  • Supported by:
    This study was supported by grants from the National Key Research and Development Program of China (2021YFD1400800), the National Natural Science Foundation of China (U23A0196 and 32160625), the Innovation Research 2035 Pilot Plan of Southwest University, China (SWU-5331000008), the Special Fund for Youth Team of Southwest University, China (SWU-XJLJ202310) and the Science and Technology Project of Jiangxi Province, China (20225BCJ22005).  We thank Dr. Fang Ding (Huazhong Agricultural University, China) for providing the antibody of CLas, and Dr. Binghai Lou (Guangxi Academy of Specialty Crops, China) for providing single D. citri DNA extraction methods.

摘要: 黄龙病是一种由Candidatus Liberibacter asiaticus (CLas) 引起韧皮部寄生的革兰氏阴细菌,主要由亚洲柑橘木虱以持久增殖的方式传播,是柑橘上最具毁灭性的病害。有研究提出黄龙病菌借助木虱细胞内的囊泡结构来复制和传播。然而,黄龙病菌如何进入木虱细胞以及囊泡运输作用在此过程中起到何种作用目前尚不清楚。本研究中我们监测木虱五龄若虫在不同取食时间后体内CLas滴度的变化,结果表明,若虫体内的CLas滴度随着取食时间的延长而增加。在CLas感染的木虱体内囊泡转运相关基因的表达显著上调,当阻断木虱内吞作用和内体网络后,CLas在木虱整虫和中肠的滴度显著下降。此外通过沉默网格蛋白重链基因(dsCHC1)的表达同样导致了柑橘木虱体内CLas滴度的降低。总而言之,我们的结果表明,CLas感染上调了柑橘木虱囊泡运输相关基因的表达从而促进了依赖内吞作用病原菌的入侵

Abstract:

Asian citrus psyllid (ACP, Diaphorina citri) is the major vector of Candidatus Liberibacter asiaticus (CLas), which is a bacterial pathogen causing the devastating citrus Huanglongbing (HLB) disease.  Diaphorina citri is known to carry CLas in a persistent and propagative manner.  Some studies have suggested that CLas may use the vesicular structures of Dcitri cells as its propagation organelles.  However, the mechanisms by which CLas enters the Dcitri cells and how vesicle-mediated trafficking is involved remain unclear.  In this study, we monitored the titer change of CLas in Dcitri nymphs during the process of CLas acquisition from feeding on infected citrus plants.  We found that the titer of CLas increased with the acquisition access period.  After infection, there was a significant upregulation in the expression of several vesicular transport-related genes in Dcitri.  The titer of CLas was significantly reduced in the midgut and whole insect body when endocytosis and the endosome network in Dcitri were inhibited.  Furthermore, silencing the Dcitri clathrin-heavy chain gene also led to a reduction in the CLas titer in Dcitri.  These results suggest that CLas infection upregulates the genes related to vesicular transport in Dcitri, which facilitates the invasion of endocytosis-dependent pathogens.

Key words: Huanglongbing , endocytosis ,  vesicular trafficking ,  CLas acquisition