SlCPK27 cross-links SlHY5 and SlPIF4 in brassinosteroid-dependent photo- and thermo-morphogenesis in tomato.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39190354.
- Also identified by DOI 10.1073/pnas.2403040121 and PMC identifier 11388283.
- Licence recorded as CC BY-NC-ND.
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Abstract
ELONGATED HYPOCOTOYL5 (HY5) and PHYTOCHROME INTERACTING FACTORs (PIFs) are two types of important light-related regulators of plant growth, however, their interplay remains elusive. Here, we report that the activated tomato (<i>Solanum lycopersicum</i>) HY5 (SlHY5) triggers the transcription of a Calcium-dependent Protein Kinase <i>SlCPK27</i>. SlCPK27 interacts with and phosphorylates SlPIF4 at Ser-252 and Ser-308 phosphosites to promote its degradation. SlPIF4 promotes hypocotyl elongation mainly by activating the transcription of <i>SlDWF</i>, a key gene in brassinosteroid (BR) biosynthesis. Such a SlHY5-SlCPK27-SlPIF4-BR cascade not only plays a crucial role in photomorphogenesis but also regulates thermomorphogenesis. Our results uncover a previously unidentified mechanism that integrates Ca<sup>2+</sup> signaling with the light signaling pathways to regulate plant growth by modulating BR biosynthesis in response to changes in ambient light and temperature.
Medical subject headings
- Solanum lycopersicum
- Brassinosteroids
- Plant Proteins
- Protein Kinases
- Gene Expression Regulation, Plant