1. Low-temperature and circadian signals are integrated by the sigma factor SIG5
- Author
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Dora L. Cano-Ramirez, Paige E. Panter, Tokiaki Takemura, Tara Saskia de Fraine, Luíza Lane de Barros Dantas, Richard Dekeya, Thiago Barros-Galvão, Pirita Paajanen, Annalisa Bellandi, Tom Batstone, Bethan F. Manley, Kan Tanaka, Sousuke Imamura, Keara A. Franklin, Heather Knight, Antony N. Dodd, de Barros Dantas, Luíza Lane [0000-0002-5342-9332], Dekeya, Richard [0000-0002-0669-650X], Paajanen, Pirita [0000-0002-0561-3717], Manley, Bethan F [0000-0002-0137-6953], Dodd, Antony N [0000-0001-6859-0105], and Apollo - University of Cambridge Repository
- Subjects
Arabidopsis Proteins ,Gene Expression Regulation, Plant ,Temperature ,Arabidopsis ,Sigma Factor ,Plant Science ,Photosynthesis - Abstract
Chloroplasts are a common feature of plant cells and aspects of their metabolism, including photosynthesis, are influenced by low-temperature conditions. Chloroplasts contain a small circular genome that encodes essential components of the photosynthetic apparatus and chloroplast transcription/translation machinery. Here, we show that in Arabidopsis, a nuclear-encoded sigma factor that controls chloroplast transcription (SIGMA FACTOR5) contributes to adaptation to low-temperature conditions. This process involves the regulation of SIGMA FACTOR5 expression in response to cold by the bZIP transcription factors ELONGATED HYPOCOTYL5 and ELONGATED HYPOCOTYL5 HOMOLOG. The response of this pathway to cold is gated by the circadian clock, and it enhances photosynthetic efficiency during long-term cold and freezing exposure. We identify a process that integrates low-temperature and circadian signals, and modulates the response of chloroplasts to low-temperature conditions.
- Published
- 2023
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