Corn's ancient enemy keeps outsmarting our best resistance genes
Oyeniran KA, Aina T, Donaldson L
Crispr
If you've ever seen streaky, stunted corn leaves in a garden or roadside field, that's this virus at work, and it's a reminder that one resistant seed variety rarely stays resistant for long.
A tiny insect called a leafhopper spreads a virus that causes streaky yellow stripes on corn leaves, stunting growth and slashing harvests across Africa. For ten years, scientists have bred corn with resistance genes and tried new tools like CRISPR gene editing to fight it, but the virus keeps mutating fast enough to dodge these defenses. Researchers now say the fix isn't a single resistant variety but an ongoing watch-and-adapt strategy that tracks the virus as it evolves.
Key Findings
Maize streak virus (MSV-A) evolves through mutation, recombination, and selection, allowing it to adapt to resistant maize hosts over time.
A decade of research has used QTL fine-mapping, gene pyramiding, CRISPR editing, and microRNA silencing to build streak-resistant maize genotypes.
Gene-editing approaches risk driving the emergence of editing-resistant viral variants, prompting the authors to propose a five-point agenda including evolutionary surveillance and escape-aware editing stewardship.
chevron_right Technical Summary
Maize streak virus, spread by leafhoppers, keeps devastating corn crops across sub-Saharan Africa by rapidly evolving around resistance genes. Scientists are now combining gene mapping, CRISPR editing, and smarter farming practices, but warn the virus can evolve past these fixes too, so breeding strategies need constant updating.
Abstract Preview
Original paper
Ecology and Evolutionary Dynamics of the A-Strain Maize Streak Virus and the Decade-Long Strategies Targeting Streak-Resistant Maize.
The A-strain maize streak virus (MSV-A; genus Mastrevirus, family Geminiviridae) is a single-stranded DNA (ssDNA) virus that severely constrains the production of maize in sub-Saharan Africa and ot...
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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. In modern ...