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Stomatal pores govern the tradeoff between CO₂ assimilation and water loss, and optimizing their performance is critical for crop resilience, particularly under dynamic field environments. Here, we show that overexpression of Triticum aestivum EPIDERMAL PATTERNING FACTOR1 (TaEPF1) in bread wheat (Triticum aestivum) reduces leaf stomatal density in a leaf surface-specific manner, with a greater decline on the abaxial surface than on the adaxial surface. TaEPF1 overexpressors exhibited substantially lower stomatal conductance than wild-type (WT) control plants, which resulted in diffusional constraints limiting photosynthesis when measured under monochromatic red light.
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