A new study published in the journal Scientific Reports indicates that the search for a single, universally climate-resilient coffee variety may be misguided. The research, funded by World Coffee Research, challenges the industry's 'cure-all' approach by demonstrating that a variety's performance is critically linked to its specific growing environment. This concept, known as genotype-by-environment interaction, suggests that location is a more significant factor in a plant's success than previously emphasized in broad climate discussions.
The comprehensive, multi-year study analyzed 32 arabica varieties across 30 different research sites in 17 countries, assessing key metrics like yield and resistance to coffee leaf rust. Researchers found that yield stability was closely correlated with temperature, with different varieties clearly adapted to either cooler or warmer climates. The severity of coffee leaf rust proved more complex, influenced by an interplay of factors including temperature, rainfall, humidity, and temperature variability, making a single resistant solution difficult to identify.
The research highlighted several high-performing varieties, including the F1 hybrids H1 Centroamericano and EC16, as well as the introgressed variety Parainema, which showed a strong combination of high productivity and disease resistance. However, the study notes that even these top performers had distinct climatic preferences and trade-offs. A key finding was that introgressed varieties—those containing genetic material from other coffee species—consistently outperformed pure arabica varieties in both yield and rust resistance. For the industry, these findings shift the focus from finding a single 'miracle' plant to developing climate adaptation strategies based on matching specific, high-potential varieties to suitable local environments.