The ancient, engineered grass that feeds the world
From a wild Mexican grass to a global powerhouse, maize is more than just a crop. It is a biological marvel that relies entirely on human partnership to survive, outproducing both wheat and rice in total annual weight.
About 9,000 years ago in southern Mexico, indigenous peoples domesticated maize from a wild grass called teosinte. While the two plants look remarkably different—teosinte is a short, bushy plant and maize is a tall, single-stalked grass—the genetic difference is controlled by just two genes: gt1 and tb1. This transformation was so profound that maize became a cornerstone of Mesoamerican life, even being deified as a god by the Olmec and Maya.
The relationship between humans and maize is symbiotic. Unlike its ancestor, whose kernels fall off the cob naturally, modern maize requires human intervention for propagation. This partnership has allowed maize to spread from the Balsas River valley to become a global staple. In 2020, world production reached an estimated 1.1 billion tonnes, surpassing the production of both wheat and rice.
However, this reliance on a single staple has historical costs. When maize was introduced to Western farming without traditional processing, malnutrition became a crisis. Indigenous populations had long used nixtamalization—soaking maize in alkali-water with ashes and lime—to unlock essential B-vitamin niacin. Without this process, populations became susceptible to pellagra, a disease that persists in food-poor regions today.
Today, maize is a centerpiece of modern biotechnology and industry. Beyond food like tortillas and polenta, it is used for animal feed, corn syrup, and biofuels like ethanol. While modern breeding and genetic engineering have increased drought and pest tolerance, the crop remains vulnerable; pests like the European corn borer and corn rootworms cause annual losses of roughly one billion dollars each in the United States.
Source: Maize
