ArticlePlant cell reports2026
Light and ABA signaling are involved in transcriptional regulation of PsbS in plants.
Article in Plant cell reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
Funding
Abstract
key messageRed light promotes PsbS transcription through the PHYs-COP1 module, blue light through the CRY1/CRY2-COP1 pathway, and UV-B via the UVR8-COP1-HY5 cascade. ABA negatively regulates PsbS through the PYLs-SnRK2s-ABI5 signaling pathway. Non-photochemical quenching (NPQ) is a central photoprotective mechanism that enables plants to dissipate excess excitation energy under high light conditions, with PsbS functioning as a key regulatory protein. However, the environmental cues controlling PsbS transcription and the underlying regulatory mechanisms remain largely unclear. Analysis of the core promoter region of PsbS identified light-responsive element G-box and abscisic acid-responsive element (ABRE) cis-elements; dual-luciferase reporter assays confirmed that the core PsbS promoter can respond to light and abscisic acid (ABA) signals. Expression analyses showed that red, blue, and ultraviolet-B (UV-B) light significantly induced PsbS transcription, whereas ABA treatment repressed it. Genetic and signaling analyses revealed that red light promotes PsbS transcription through the PHYs-COP1 module, blue light through the CRY1/CRY2-COP1 pathway, and UV-B via the UVR8-COP1-HY5 cascade. In contrast, ABA negatively regulates PsbS through the PYLs-SnRK2s-ABI5 signaling pathway. Yeast one-hybrid (Y1H) screening identified 36 candidate transcription factors targeting PsbS. Dual-luciferase assays and electrophoretic mobility shift assays (EMSA) further confirmed that bZIP2, bZIP16, bZIP43, CCA1, and IDD1 act as candidate transcriptional repressors of PsbS. This study systematically integrates known light and ABA signaling pathways that regulate PsbS expression, providing potential molecular targets for improving crop photosynthetic efficiency.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.