Genetic dissection and validation of major and stable QTLs for the flag leaf size-related traits in common wheat (Triticum aestivum L.).
Li Z, Luo Q, Du Y, Tan Y, Li H
Crop Improvement
Bigger flag leaves on wheat plants mean more photosynthesis and heavier grain yields, so this discovery could directly increase the amount of bread wheat produced from the same field.
The top leaf on a wheat plant — called the flag leaf — acts like a solar panel, powering grain development. Researchers pinpointed five specific spots in the wheat genome that reliably make this leaf bigger or differently shaped, and confirmed these spots work across different growing conditions and plant families. They also created simple genetic tests so breeders can now quickly pick plants with the best leaf genes without waiting to measure every plant by hand.
Key Findings
Five major, stable genetic regions (QTLs) were identified controlling flag leaf length, width, area, and shape ratio, each explaining 10–16% of the trait variation on average.
A genetic map of 11,583 markers was built and used to map 97–273 QTLs across six environments using three different statistical methods.
Three KASP molecular markers closely linked to these QTLs were validated in independent populations and shown to have a pyramiding effect — stacking multiple favorable loci progressively increases flag leaf size.
chevron_right Technical Summary
Scientists identified five key genetic regions in wheat that reliably control flag leaf size across multiple environments, and developed molecular tools to help breeders select for larger, more productive leaves — potentially boosting wheat yields.
Abstract Preview
The flag leaf serves as the primary photosynthetic organ in wheat, and its size is significantly correlated with wheat yield. The mapping of QTLs associated with flag leaf size and the development ...
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