Teosinte is the wild ancestor of maize (corn), a group of tall grasses native to Mexico and Central America that were domesticated over 10,000 years ago to create the crop we know today. It differs from maize in its numerous branches, small ears with very few seeds, and hard, protective husks. Teosinte is genetically diverse and provides valuable traits for modern agriculture, such as resistance to diseases and pests, and its study is crucial for understanding maize evolution.
Maize, also known as corn in North American English, is a tall stout grass that produces cereal grain. The leafy stalk of the plant gives rise to male inflorescences or tassels which produce pollen, and female inflorescences called ears. The ears yield grain, known as kernels or seeds.
Modern maize did not appear by accident. It is the result of centuries of human-guided genetic modification, starting with ancient farmers who selected useful traits from a wild grass called teosinte.
Science later showed us the exact DNA changes that made this possible.
The tb1 gene reduced branching, the tga1 gene softened the kernel casing, the su1 gene changed starch composition, the zfl2 gene reshaped the ear, and the Prol1.1 region reinforced upright growth.
These natural genetic modifications turned tiny hard seeds into the large golden cobs that feed billions today.
Today, we continue this same journey with modern GM technology. Instead of waiting centuries for changes, scientists can now introduce beneficial traits more precisely and quickly, like pest resistance in cowpea or drought tolerance in maize.
The story of maize reminds us that genetic modification is not new. What has changed is the speed, precision, and potential to solve urgent food security challenges.
By Abdulrazak Ibrahim, STI enthusiast, Biochem, nol, Biologist and Research and Development practitioner
