FgPEX4 is involved in development, pathogenicity, and cell wall integrity in Fusarium graminearum

Related Experiment Video

Updated: Jan 31, 2026

Sexual Development and Ascospore Discharge in Fusarium graminearum
08:20

Sexual Development and Ascospore Discharge in Fusarium graminearum

Published on: March 29, 2012

22.6K

Li Zhang1, Lina Wang1, Yuancun Liang2

  • 1Key Laboratory of Agricultural Microbiology, College of Plant Protection, Shandong Agricultural University, Tai'an, 271018, China.

Current Genetics
|January 4, 2019
PubMed

Insights

The FgPEX4 gene is crucial for the development, pathogenicity, and cell wall integrity of Fusarium graminearum. Deleting FgPEX4 impairs fungal growth, toxin production, and defense against oxidative stress.

Area of Science:

  • Fungal Biology
  • Cell Biology
  • Biochemistry

Background:

  • Peroxisomes are vital organelles in eukaryotic cells, performing diverse biological functions.
  • PEX4, a peroxisome assembly protein (peroxin), acts as a ubiquitin-conjugating enzyme.
  • Fusarium graminearum is a significant phytopathogenic fungus responsible for crop diseases and mycotoxin production.

Purpose of the Study:

  • To functionally characterize the role of FgPEX4 in the phytopathogenic fungus Fusarium graminearum.
  • To investigate the impact of FgPEX4 deletion on fungal development, pathogenicity, and cellular processes.

Main Methods:

  • Construction of a FgPEX4 deletion mutant (ΔPEX4) using homologous recombination.
  • Phenotypic analysis of the ΔPEX4 mutant, including growth, conidiation, and perithecia production.
  • Assessment of pathogenicity, deoxynivalenol (DON) production, cell wall integrity, lipid droplet accumulation, and reactive oxygen species (ROS) elimination.
  • Western blot analysis to examine protein phosphorylation (Mgv1).
  • Proteomics analysis to compare protein expression levels between wild-type and ΔPEX4 strains.

Main Results:

  • The ΔPEX4 mutant exhibited reduced mycelial growth, conidiation, and perithecia formation.
  • FgPEX4 deletion led to impaired pathogenicity and significantly reduced deoxynivalenol (DON) production.
  • FgPEX4 is involved in maintaining cell wall integrity, lipid droplet accumulation, and ROS elimination.
  • Western blot showed reduced phosphorylation of Mgv1 in the ΔPEX4 mutant.
  • Proteomics revealed downregulated protein expression in pathways related to biosynthesis, fatty acid metabolism, cell wall synthesis, and redox reactions in ΔPEX4.

Conclusions:

  • FgPEX4 plays a critical role in the development and pathogenicity of Fusarium graminearum.
  • The gene is essential for maintaining cell wall integrity and managing oxidative stress.
  • FgPEX4 influences key metabolic and biosynthetic pathways within the fungus.
Keywords:
Cell wall integrityFgPEX4Fusarium graminearumPeroxisomeProteomics

More Related Videos

Glycan Profiling of Plant Cell Wall Polymers using Microarrays12:30

Glycan Profiling of Plant Cell Wall Polymers using Microarrays

Published on: December 17, 2012

15.2K
A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates11:48

A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates

Published on: October 28, 2021

3.8K

Related Concept Videos

Plant Cell Wall02:43

Plant Cell Wall

The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.
60.3K
Plant Cell Wall01:07

Plant Cell Wall

Plant cells have a cell wall, a rigid outer covering that protects the cell and provides shape and support. During cell division, a mixture of enzymes, proteins, and glucose molecules is transported via vesicles to the center of the cell. These vesicles continuously fuse and build a cell plate between the dividing cells. As the cell plate matures, new polysaccharides are added to it to form the cell walls of the daughter cells. The predominant polysaccharide in the cell wall is cellulose, made...
7.6K
Bacterial Cell Wall01:22

Bacterial Cell Wall

The bacterial cell wall is an essential structural component that encases the plasma membrane, preserving cellular integrity, determining shape, and protecting against osmotic stress. This rigid yet flexible structure primarily comprises peptidoglycan, a polymer that forms a mesh-like matrix conferring mechanical strength and flexibility.Peptidoglycan Composition and StructurePeptidoglycan, the core of the bacterial cell wall, comprises alternating units of N-acetylglucosamine (NAG) and...
2.8K
Archaeal Cell Wall01:29

Archaeal Cell Wall

Archaeal cell walls are structurally and compositionally distinct from their bacterial counterparts, lacking the characteristic peptidoglycan layer found in most bacteria. Instead, archaeal cell walls exhibit remarkable diversity, utilizing materials such as pseudomurein, polysaccharides, and proteins to construct their protective outer layers. This structural flexibility is closely tied to archaea's ecological adaptability.S-Layers: The Common Archaeal Cell WallThe S-layer is the most...
1.1K
Role of Microtubules in Cell Wall Deposition01:02

Role of Microtubules in Cell Wall Deposition

Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
3.1K
Integration by Parts: Indefinite Integrals01:26

Integration by Parts: Indefinite Integrals

Integration by parts is a fundamental technique in calculus for evaluating integrals involving the product of two functions. It is particularly useful when direct integration is not feasible. The method is based on the product rule for differentiation, which states that the derivative of a product equals the derivative of the first function times the second, plus the first function times the derivative of the second. By integrating this identity and rearranging terms, the integration by parts...
166