Maize study finds genes that help crops adapt to change

Maize study finds genes that help crops adapt to change
All the diversity of maize across the planet emanates from Mexico, where the crop was first domesticated thousands of years ago. Since then, farmers have bred and adapted maize to local environments, leading to tens of thousands of varieties. Credit: USDA/Provided

Over many thousands of years, farmers have bred maize varieties so the crops are optimally adapted to local environments.

A new study, published Feb. 6 in Nature Genetics, analyzed close to 4,500 maize varieties – called landraces – bred and grown by farmers from 35 countries in the Americas to identify more than 1,000 driving large-scale adaptation to the environment.

"The study provided a powerful catalog of the genes necessary for corn to adapt to different latitudes and elevations across the world," said senior author Edward Buckler, a research geneticist at the USDA-Agricultural Research Service and adjunct professor of and genetics at the Institute for Genomic Diversity at Cornell.

"It takes a thousand genes to attune a plant for a particular latitude and the elevation where it is grown. That's what we are mapping here," Buckler said.

The researchers also identified genes associated with – the period between planting and the emergence of flowers, which is a measure of the rate of development. Flowering time is a basic mechanism through which plants integrate environmental information to balance when to make seeds instead of more leaves.

"Flowering time is the trait that is most correlated with every other trait," Buckler said. The study found that more than half of (the most basic form of genetic variation) associated with altitude were also associated with flowering time, revealing these traits are highly linked.

Current technology, including a new rapid experimental design called F-One Association Mapping (FOAM), allowed the researchers to use the collection of diverse maize varieties to figure out which genes were important for adaptation.

"With over the next century, we can directly use this information to figure out what genes are important" to greatly speed up breeding efforts of maize, Buckler said. "We're tapping the wisdom of farmers over the last 10,000 years to make the next century's corn."

Sarah Hearne, a molecular geneticist at the International Maize and Wheat Improvement Center (CIMMYT) and a maize research lead scientist with Seeds of Discovery, is also a senior author of the paper. J. Alberto Romero Navarro, a doctoral student in plant breeding and genetics, is the paper's first author.

Hearne and colleagues at CIMMYT envisioned the project, led the logistical efforts and conducted field trials,while Romero, Buckler and Cornell colleagues led the genomic analysis of the data.


Explore further

Genomic tools can help researchers develop crops quickly

Journal information: Nature Genetics

Provided by Cornell University
Citation: Maize study finds genes that help crops adapt to change (2017, February 15) retrieved 24 July 2019 from https://phys.org/news/2017-02-maize-genes-crops.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
38 shares

Feedback to editors

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more