A proposed working model for HPY1 (IMAGE)

Science China Press

A proposed working model for HPY1

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HPY1 mutation enhances the transcriptional level of itself through feedback regulation. Then, the HPY1 targets RbcS2, RbcS3, and RbcS4 to increase their expression and Rubisco activity, which improves photosynthetic efficiency and biomass accumulation in rice. Meanwhile, the HPY1 targets to CCP1 and FLO2, key genes for glume development, to enhance their expression to increase grain size. Finally, the improved photosynthetic rate, biomass accumulation and high expression of CCP1 and FLO2 working together lead to a high grain yield of rice.

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