Study Identifies South America as Origin of Irish Potato Famine Pathogen

Genomic analysis traces Phytophthora infestans to the Andes, challenging long-held theories of a Mexican origin.

Researchers at North Carolina State University conducted one of the largest genome studies on Phytophthora infestans, the pathogen behind the Irish potato famine.
The study provides strong evidence that the pathogen originated in the Andes Mountains of South America, not Mexico as previously theorized.
Genomic comparisons revealed significant evolutionary and migration patterns, with historic populations from the Andes predating those in Mexico and Europe.
The findings highlight the importance of studying wild Andean potato species to uncover potential resistance to late blight disease, which continues to affect global agriculture.
Climate change and modern trade are impacting the Andean region, raising concerns about the loss of genetic diversity crucial for combating the pathogen.