PHYA and PHYC as Candidate Loci for Flowering Time and Developmental Plasticity in Wheat.

A major QTL on wheat chromosome 5A shows light-dependent allelic effects on developmental responses, mapping to an inversion-linked haplotype at PHYC-A and VRN-A1.

• Why it matters: Canopy shading in high-density cropping alters both light intensity and spectral quality, but wheat’s genetic control of these light-driven developmental changes is still unclear.
• What they did: In a recombinant inbred lines population, phenological and morphological traits were measured under sunlight versus simulated canopy shade, revealing genotype-by-environment variation at the 5A QTL.
• The result: Natural variation at PHYC-A interacts with VRN-A1 to regulate heading time, with PHYC-A effects substantially stronger in winter VRN-A1 backgrounds, and PHYA-B variation linked to delayed heading under shade.

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