Study reveals genetic weakness in key U.S. corn breeding stock
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A University of Illinois Urbana-Champaign study reveals that genetic variation for grain yield is critically low in intermediate-maturity stiff-stalk corn lines, the primary U.S. breeding stock. These hybrids account for nearly a third of global corn production. The research, published in G3: Genes, Genomes, Genetics, also found early- and late-maturing lines retain substantial variability.
Breeding Bottleneck
Modern corn breeding relies on crossing genetically distinct heterotic groups — stiff-stalk (SS) and non-stiff-stalk (NSS) — to harness hybrid vigor. Over decades, breeders repeatedly selected top-performing inbred lines, narrowing genetic diversity within each group. The new study evaluated 13 SS and 28 NSS inbreds across early-, intermediate-, and late-maturing types to measure the extent of this loss.
Yield Vulnerability
Researchers found that genetic variability for grain yield is critically low in intermediate-maturity SS lines, the most widely grown maturity group in the U.S. Corn Belt. These hybrids produce approximately one-third of global corn output. In contrast, early- and late-maturing inbreds in both SS and NSS groups retained sufficient variation for yield and other traits like plant height and flowering time.
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