Two domesticated species of rice shaped the population structure of Xanthomonas oryzae pv. oryzae in Africa.

African Xanthomonas oryzae pv. oryzae (AfXoo) forms a distinct phylogroup with five main populations, reflecting its unique evolutionary history in Africa.

• Why it matters: Understanding the genetic diversity and evolution of AfXoo is crucial for managing bacterial leaf blight in African rice cultivation, which has significant agricultural and economic implications.
• What they did: Researchers analyzed 87 AfXoo genomes, revealing population structure, historical expansion and decline, and variation in type III effectors, especially TALEs, across populations.
• The result: Findings suggest AfXoo's evolution is linked to African rice's history, and the pathogen's genetic diversity enables it to infect both African and Asian rice, informing disease control strategies.