Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (8): 2686-2702.DOI: 10.1016/j.jia.2023.06.028

• • 上一篇    下一篇

非经典分泌蛋白(MoMtp)是稻瘟病菌产孢、应激稳态以及致病力所必需的

  

  • 收稿日期:2023-02-23 接受日期:2023-05-31 出版日期:2024-08-20 发布日期:2024-07-29

Disruption of non-classically secreted protein (MoMtp) compromised conidiation, stress homeostasis, and pathogenesis of Magnaporthe oryzae

Wajjiha Batool1, 2, Justice Norvienyeku2, 3, Wei Yi1, Zonghua Wang2, Shihong Zhang1#, Lili Lin2#   

  1. 1 Key Laboratory for Extreme-Environmental Microbiology, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China
    2 Ministerial and Provincial Joint Innovation Center for Safety Production of Cross-Strait Crops, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    3 Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests, College of Plant Protection, Hainan University, Haikou 570288, China 
  • Received:2023-02-23 Accepted:2023-05-31 Online:2024-08-20 Published:2024-07-29
  • About author:Wajjiha Batool, E-mail: wajjiha@syau.edu.cn; #Correspondence Lili Lin, E-mail: lili_lin@fafu.edu.cn; Shihong Zhang, E-mail: zhangsh89@syau.edu.cn
  • Supported by:

    This project is funded by the National Natural Science Foundation of China (32172364 to Shihong Zhang and 32272513 to Zonghua Wang) and Fujian Agriculture and Forestry University scholarship, China for Wajjiha Batool.

摘要:

稻瘟病是由半活体营养子囊真菌稻瘟病菌(Magnaporthe oryzae)引起的病害,对全球水稻的可持续生产构成重大威胁。研究表明,为了成功侵染,稻瘟病菌会向水稻细胞分泌大量功能多样的蛋白质以利其致病。然而,这些效应蛋白进入宿主细胞后靶向何处及其如何促进病原致病的机制仍不清。我们研究发现稻瘟病菌一假定非典型分泌蛋白MoMtp调控稻瘟病菌分生孢子产生和附着胞的形成MoMTP基因敲除突变体在侵染水稻叶片时引起水稻超敏反应,表明MoMtp对稻瘟病菌的毒至关重要细胞壁完整性和氧化胁迫实验结果表明MoMtp可能真菌维持细胞结构完整性必须MoMTP基因在侵染的所有阶段均上调表达,表明其可能在稻瘟病菌对宿主入侵和定殖过程中起调节作用。此外,通过烟草瞬时表达以及水稻叶鞘侵染实验发现,MoMtp-GFP定位于烟草及水稻细胞的线粒体中。综上所述,我们MoMtp蛋白可促进稻瘟病菌分正常的分生孢子的形成和病,并可能在侵入过程中干扰水稻线粒体的正常功能。

Abstract:

Blast disease, caused by the hemibiotrophic ascomycete fungus, Magnaporthe oryzae, is a significant threat to sustainable rice production worldwide.  Studies have shown that the blast fungus secretes vast arrays of functionally diverse proteins into the host cell for a successful disease progression.  However, the final destinations of these effector proteins inside the host cell and their role in advancing fungal pathogenesis remain a mystery.  Here, we reported that a putative mitochondrial targeting non-classically secreted protein (MoMtp) positively regulates conidiogenesis and appressorium maturation in Moryzae.  Moreover, MoMTP gene deletion mutant strains triggered a hypersensitive response when inoculated on rice leaves displaying that MoMtp is essential for the virulence of Moryzae.  In addition, cell wall and oxidative stress results indicated that MoMtp is likely involved in the maintenance of the structural integrity of the fungus cell.  Our study also demonstrates an upregulation in the expression pattern of the MoMTP gene at all stages of infection, indicating its possible regulatory role in host invasion and the infectious development of M. oryzae.  Furthermore, Agrobacterium infiltration and sheath inoculation confirmed that MoMtp-GFP protein is predominantly localized in the host mitochondria of tobacco leaf and rice cells.  Taken together, we conclude that MoMtp protein likely promotes the normal conidiation and pathogenesis of Moryzae and might have a role in disturbing the proper functioning of the host mitochondria during pathogen invasion.

Key words: plant-pathogen interactions ,  effectors ,  hypersensitive response ,  pathogenesis ,  mitochondria