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“Campesinos” are driving the evolution of maize in North America

During the rainy season, García Cuenca selects the seeds he stored the previous cycle, plants them and cares for the seedlings. Multiply that process by the millions of other campesinos in Mexico and you get billions of genetically different maize plants—each exposed to a wide diversity of environments and subjected to unique selection practices.

Source: Small Farmers in Mexico Keep Corn’s Genetic Diversity Alive | Scientific American