TaGα knockout in wheat causes early heading and short organ length, with dose-dependent effects through various pathways.
Li Y, Zhao W, Peng X, Liang Y, Xue R
Crispr
The wheat in your bread and pasta may soon be bred to flower earlier or produce more uniform grain sizes — this gene is one of the dials breeders could turn to adapt crops to shifting growing seasons.
Wheat carries a gene that acts like a volume knob for how the plant develops. Scientists used molecular scissors to turn off one or both copies of this gene and watched what happened. Turning off just one copy made the wheat flower a bit early, but turning off both caused the whole plant to shrink — shorter stems, smaller leaves, and smaller grains.
Key Findings
Knocking out both TaGα gene copies (double mutant) caused early heading time AND reduced plant height, leaf length, and grain length, while single knockouts only triggered early heading.
The effects are strictly dose-dependent: one functional copy is sufficient to maintain normal organ size, but not enough to prevent early flowering.
CRISPR/Cas9 was used to generate targeted loss-of-function mutations in TaGα-7A and TaGα-7D homeologs in the spring wheat cultivar 'Fielder'.
chevron_right Technical Summary
Scientists used CRISPR gene editing to knock out a key signaling gene (TaGα) in wheat, discovering it controls both flowering time and organ size in a dose-dependent way. Disabling one copy only caused earlier flowering, while disabling both copies also shortened plant height, leaf length, and grain length.
Abstract Preview
TaGα regulates wheat development in a dose-dependent manner: a single mutant of TaGα solely accelerates heading, while a double mutant not only accelerates heading but also shortens organ length. T...
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