Journal of Fungi (May 2024)

The Autophagy-Related Protein ATG8 Orchestrates Asexual Development and AFB1 Biosynthesis in <i>Aspergillus flavus</i>

  • Qingru Geng,
  • Jixiang Hu,
  • Pingzhi Xu,
  • Tongzheng Sun,
  • Han Qiu,
  • Shan Wang,
  • Fengqin Song,
  • Ling Shen,
  • Yongxin Li,
  • Man Liu,
  • Xue Peng,
  • Jun Tian,
  • Kunlong Yang

DOI
https://doi.org/10.3390/jof10050349
Journal volume & issue
Vol. 10, no. 5
p. 349

Abstract

Read online

Autophagy, a conserved cellular recycling process, plays a crucial role in maintaining homeostasis under stress conditions. It also regulates the development and virulence of numerous filamentous fungi. In this study, we investigated the specific function of ATG8, a reliable autophagic marker, in the opportunistic pathogen Aspergillus flavus. To investigate the role of atg8 in A. flavus, the deletion and complemented mutants of atg8 were generated according to the homologous recombination principle. Deletion of atg8 showed a significant decrease in conidiation, spore germination, and sclerotia formation compared to the WT and atg8C strains. Additionally, aflatoxin production was found severely impaired in the ∆atg8 mutant. The stress assays demonstrated that ATG8 was important for A. flavus response to oxidative stress. The fluorescence microscopy showed increased levels of reactive oxygen species in the ∆atg8 mutant cells, and the transcriptional result also indicated that genes related to the antioxidant system were significantly reduced in the ∆atg8 mutant. We further found that ATG8 participated in regulating the pathogenicity of A. flavus on crop seeds. These results revealed the biological role of ATG8 in A. flavus, which might provide a potential target for the control of A. flavus and AFB1 biosynthesis.

Keywords