Two teosintes made modern maize

Area of Science:

• * Plant genetics and evolutionary biology.
• * Agricultural science and crop domestication.

Background:

• * The origin of maize (Zea mays) has been debated for a century, with existing genetic and archaeological models failing to explain all data.
• * Recent research suggests a role for the wild relative Zea mays ssp. mexicana in maize evolution.

Purpose of the Study:

• * To elucidate the origin of modern maize using population genetic analysis.
• * To investigate the contribution of admixture to maize diversity and agronomic trait variation.

Main Methods:

• * Population genetic analysis of maize.
• * Analysis of admixture patterns in relation to domestication and dispersal.

Main Results:

• * Modern maize originated from an admixture event between ancient maize and Zea mays ssp. mexicana in the highlands of Mexico.
• * This admixture occurred approximately 4000 years after maize domestication commenced.
• * Admixture variation is a critical factor in both individual gene diversity and the genetic basis of agronomic traits.

Conclusions:

• * The study clarifies the complex origin of modern maize, highlighting the significance of hybridization with Zea mays ssp. mexicana.
• * Findings prompt new inquiries into human-driven dispersal mechanisms of maize across the Americas.