Plant circadian clock control of Medicago truncatula nodulation via regulation of nodule cysteine-rich peptides
| Autor: | Kirankumar S. Mysore, Isabelle A. Carré, Proyash Roy, Charlotte Rich-Griffin, Miriam L. Gifford, Mingkee Achom, Laura Baxter, E Fletcher, L Richards, B Richmond, Emma Picot, M Rowson, Bonyadi-Pour R, Beatriz Lagunas, Sascha Ott, Blackwell J, Aschauer N, Alonso J. Pardal, J Wen |
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| Předmět: |
Root nodule
Physiology Circadian clock Population Mutant Plant Science Biology Plant Root Nodulation Rhizobia Symbiosis Gene Expression Regulation Plant Circadian Clocks Nitrogen Fixation Medicago truncatula Gene family Cysteine education Plant Proteins education.field_of_study QK food and beverages biology.organism_classification Cell biology Peptides Root Nodules Plant Sinorhizobium meliloti |
| Zdroj: | BASE-Bielefeld Academic Search Engine |
| ISSN: | 0022-0957 |
| DOI: | 10.1093/jxb/erab526 |
| Popis: | Legumes house nitrogen-fixing endosymbiotic rhizobia in specialized polyploid cells within root nodules, which undergo tightly regulated metabolic activity. By carrying out expression analysis of transcripts over time in Medicago truncatula nodules, we found that the circadian clock enables coordinated control of metabolic and regulatory processes linked to nitrogen fixation. This involves the circadian clock-associated transcription factor LATE ELONGATED HYPOCOTYL (LHY), with lhy mutants being affected in nodulation. Rhythmic transcripts in root nodules include a subset of nodule-specific cysteine-rich peptides (NCRs) that have the LHY-bound conserved evening element in their promoters. Until now, studies have suggested that NCRs act to regulate bacteroid differentiation and keep the rhizobial population in check. However, these conclusions came from the study of a few members of this very large gene family that has complex diversified spatio-temporal expression. We suggest that rhythmic expression of NCRs may be important for temporal coordination of bacterial activity with the rhythms of the plant host, in order to ensure optimal symbiosis. |
| Databáze: | OpenAIRE |
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