The sugar responsive circadian clock regulator bZIP63 modulates plant growth
| Autor: | Marina C. M. Martins, Elodie Gilbault, Cleverson Carlos Matiolli, David Wells Newman, Carlos Takeshi Hotta, Michel Vincentz, Américo José Carvalho Viana, João G. P. Vieira, Camila Caldana, Gustavo Turqueto Duarte |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physiology
Starch Photoperiod Mutant Circadian clock Arabidopsis Regulator Plant Science Protein Serine-Threonine Kinases medicine.disease_cause chemistry.chemical_compound Gene Expression Regulation Plant Circadian Clocks medicine Arabidopsis thaliana AMIDO Circadian rhythm Mutation biology Arabidopsis Proteins food and beverages biology.organism_classification Circadian Rhythm Cell biology Basic-Leucine Zipper Transcription Factors chemistry Sugars |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Adjustment to energy starvation is crucial to ensure growth and survival. In Arabidopsis thaliana (Arabidopsis), this process relies in part on the phosphorylation of the circadian clock regulator bZIP63 by SUCROSE non-fermenting RELATED KINASE1 (SnRK1), a key mediator of responses to low energy. We investigated the effects of mutations in bZIP63 on plant carbon (C) metabolism and growth. Results from phenotypic, transcriptomic and metabolomic analysis of bZIP63 mutants prompted us to investigate the starch accumulation pattern and the expression of genes involved in starch degradation and in the circadian oscillator. bZIP63 mutation impairs growth under light-dark cycles, but not under constant light. The reduced growth likely results from the accentuated C depletion towards the end of the night, which is caused by the accelerated starch degradation of bZIP63 mutants. The diel expression pattern of bZIP63 is dictated by both the circadian clock and energy levels, which could determine the changes in the circadian expression of clock and starch metabolic genes observed in bZIP63 mutants. We conclude that bZIP63 composes a regulatory interface between the metabolic and circadian control of starch breakdown to optimize C usage and plant growth. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|