Maize genes found that boost drought survival and kernel yield together
He N, Wang Z, Xiang B, Chen H, Zhou W
Crop Improvement
Corn fields facing back-to-back drought and disease pressure could one day carry crop varieties bred from these exact gene variants, meaning the cob you grow in your garden or buy at a farmstand is less likely to fail in a bad-weather year.
Corn plants have a family of molecular switches that help them respond to stress, and scientists just figured out what each one does. Some switches help the plant survive salt or fungal disease, one helps it survive drought, and another makes its kernels thicker and heavier. By finding the exact genetic versions that work best, breeders now have specific targets to combine when building corn that can handle tough conditions without losing yield.
Key Findings
ZmMAP4K2 contains distinct variants associated with both salt tolerance and southern leaf blight resistance, making it a multi-stress candidate locus.
Natural variation in ZmMAP4K4 was strongly associated with drought survival, and a favorable allele of ZmMAP4K10 linked to higher transcriptional activity correlated with increased kernel thickness and yield traits.
Multi-locus combinations of stress-associated variants identified genotype stacks with enhanced resilience to multiple stresses and no detectable penalty on major yield-related traits.
chevron_right Technical Summary
Researchers mapped 11 stress-related genes in maize, finding specific gene variants linked to salt tolerance, drought survival, disease resistance, and higher kernel yield. The work pinpoints exact genetic targets that breeders can stack together to grow more resilient, productive corn without sacrificing other traits.
Abstract Preview
Original paper
Genome-wide characterization and association analysis of the maize MAP4K gene family identify candidate loci for stress resilience and yield improvement.
Mitogen-activated protein kinase kinase kinase kinase (MAP4K) cascade components are versatile signaling integrators in plants, yet their agronomic relevance in crops remains largely unexplored. He...
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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 ...