In a study published in the journal Nature Genetics, scientists have traced the genetic adaptations of corn (maize) over centuries of cultivation in the Americas. By analyzing the genomes of over 1,000 maize samples from diverse geographic regions and time periods, the researchers identified key genetic changes that allowed corn to adapt to different elevations, climates, and growing conditions.

Corn, a staple food crop in many parts of the world, was first domesticated in southern Mexico around 9,000 years ago. From there, it spread throughout the Americas and was cultivated by various indigenous civilizations. Over time, farmers selectively bred corn for desirable traits, such as larger ears, resistance to pests and diseases, and adaptation to different environments.

The study revealed several important genetic adaptations that enabled corn to thrive in diverse conditions. For instance, the researchers found that corn grown at high elevations had genetic changes that enhanced its tolerance to cold temperatures and reduced water loss. In contrast, corn grown in lowland tropical regions showed adaptations for drought resistance and increased photosynthetic efficiency.

The genetic diversity of corn also reflects the cultural practices and preferences of different indigenous groups. For example, the researchers found that certain genetic variants associated with culinary traits, such as kernel color and texture, were more common in regions with specific culinary traditions.

Overall, the study provides valuable insights into the long-term process of crop domestication and adaptation. By understanding the genetic basis of corn's adaptability, scientists can develop more resilient and productive maize varieties that can thrive in a changing climate and meet the demands of a growing global population.