Journal
DEVELOPMENTAL CELL
Volume 44, Issue 4, Pages 512-+Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2017.12.028
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Funding
- National Natural Science Foundation of China [31730009, 31721001, 31670282, 31670307]
- National Key Research and Development Program of China [2017YFA 0503800]
- Strategic Priority Research Program Molecular Mechanism of Plant Growth and Development [XDPB04]
- NIGMS
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UV-B light (UV-B radiation) is known to inhibit plant growth, but the mechanism is not well understood. UVR8 (UV RESISTANCE LOCUS 8) is a UV-B light photoreceptor that mediates UV-B light responses in plants. We report here that UV-B inhibits plant growth by repressing plant steroid hormone brassinosteroid (BR)-promoted plant growth. UVR8 physically interacts with the functional dephosphorylated BES1 (BRI1-EMS-SUPPRESSOR1) and BIM1 (BES1-INTERACTING MYC-LIKE 1) transcription factors that mediate BR-regulated gene expression and plant growth to inhibit their activities. Genome-wide gene expression analysis defined a BES1-dependent UV-B-regulated transcriptome, which is enriched with genes involved in cell elongation and plant growth. We further showed that UV-B-activated and nucleus-localized UVR8 inhibited the DNAbinding activities of BES1/BIM1 to directly regulate transcription of growth-related genes. Our results therefore establish that UVR8-BES1/BIM1 interaction represents an early photoreceptor signaling mechanism in plants and serves as an important module integrating light and BR signaling.
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