biostudies-literatureUnknown12Yin XNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaCalvin cycle is a sequence of enzymatic reactions that assimilate atmospheric CO₂ in photosynthesis. Multiple components are known to participate in the induction or suppression of the Calvin cycle but the mechanism of its regulation by phytohormones is still unclear. Brassinosteroids (BRs) are steroid phytohormones that promote photosynthesis and crop yields. In this study, we study the role of BRs in regulating Calvin cycle genes to further understand the regulation of the Calvin cycle by phytohormones in tomatoes. BRs and their signal effector BRASSINAZOLE RESISTANT 1 (BZR1) can enhance the Calvin cycle activity and improve the photosynthetic ability. BRs increased the accumulation of dephosphorylated form of BZR1 by 94% and induced an 88-126% increase in the transcription ofFrontiers in plant science811948https://www.ebi.ac.uk/biostudies/studies/S-EPMC8810641biostudies-literatureBRASSINAZOLE RESISTANT 1 Mediates Brassinosteroid-Induced Calvin Cycle to Promote Photosynthesis in Tomato.PMC8810641Yin XXia XTang MYu JfalseBRASSINAZOLE RESISTANT 1 Mediates Brassinosteroid-Induced Calvin Cycle to Promote Photosynthesis in Tomato.Calvin cycle is a sequence of enzymatic reactions that assimilate atmospheric CO₂ in photosynthesis. Multiple components are known to participate in the induction or suppression of the Calvin cycle but the mechanism of its regulation by phytohormones is still unclear. Brassinosteroids (BRs) are steroid phytohormones that promote photosynthesis and crop yields. In this study, we study the role of BRs in regulating Calvin cycle genes to further understand the regulation of the Calvin cycle by phytohormones in tomatoes. BRs and their signal effector BRASSINAZOLE RESISTANT 1 (BZR1) can enhance the Calvin cycle activity and improve the photosynthetic ability. BRs increased the accumulation of dephosphorylated form of BZR1 by 94% and induced an 88-126% increase in the transcription of2021-01-01T00:00:00Z20212025-04-05T10:52:07.749Z2025-04-05T10:52:07.749ZS-EPMC88106413512643410.3389/fpls.2021.811948