Diversity of Microbial Plant Pathogens in the Iranian Plateau

Strategic Insights -

Researchers from Shiraz University conducted a study to examine the population structure, taxonomic diversity, and biology of species associated with wheat, barley, and oat in the Iranian Plateau, the center of domestication of these crops. The study aimed to shed light on the correlation between the center of domestication and the diversity of accompanying bacterial pathogens.

Key Takeaways:

  • The study found that phylogenetically diverse groups of strains were associated with bacterial mosaic symptoms on small grain cereals in the domestication center, with at least five taxonomically distinct clades identified.
  • The five phylogenetic clades were capable of inducing mosaic and chlorosis on their host of isolation, and most virulence-associated genomic contents were somewhat similar.
  • The study suggests a correlation between the center of wheat, barley, and oat domestication and the high taxonomic diversity of the accompanying pathogens.
  • The researchers isolated novel species in the genus , which were previously unknown to cause plant diseases on annual crops and vegetables.
  • The study provides insights into the taxonomic diversity, pathogenicity, and origin of strains pathogenic to small grain cereals in the Iranian Plateau.
  • The findings have implications for understanding the co-evolution between domesticated crops and their bacterial pathogens.
  • The study highlights the importance of phylogeographic investigations in the area to strengthen the co-evolutionary hypothesis.
  • The research was supported by the Iran National Science Foundation and was conducted in collaboration with international researchers from various institutions.

Statistics:

  • At least 5 taxonomically distinct clades of strains were identified in the study.
  • The five phylogenetic clades were capable of inducing mosaic and chlorosis on their host of isolation.
  • Most virulence-associated genomic contents of the five clades isolated in the study were somewhat similar.
  • The study examined the taxonomic diversity and population structure of strains in the Iranian Plateau, which is estimated to be 22,000 square kilometers in area.
  • The research concluded that most of the strains isolated from small grain cereals in Iran belonged to the two previously described species and , while several strains were grouped in three distinct clades.

Sources:

  • Taghavi, S. M., et al. (2025). The center of wheat domestication drives diversity of Clavibacter pathogens. Applied and Environmental Microbiology, 2025. Available at: aem.asm.org/
  • Applied and Environmental Microbiology. (n.d.). Amer Soc Microbiology, 1752 N St NW, Washington, DC 20036-2904, USA.
  • Iran National Science Foundation. (n.d.).
  • NewsRx. (2025, October 21). New Applied and Environmental Microbiology Study Results from Shiraz University Described (The center of wheat domestication drives diversity of Clavibacter pathogens). Life Science Weekly, p 2228.