Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/ncomms12636
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Funding
- IBiSA
- ANR
- Conseil General de l'Essonne
- CNRS
- NodCAAT
- Labex Saclay Plant Science (SPS) ANR
- Lidex 'Plant Phenotyping Pipeline' (3P) project
- National Science Foundation, USA [DBI-0703285]
- HAPIHUB ANR
- NodCAAT ANR
- French Laboratory of Excellence project 'TULIP'
- Paris-Sud University
- INRA CJS
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1127155] Funding Source: National Science Foundation
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Legumes develop symbiotic interactions with rhizobial bacteria to form nitrogen-fixing nodules. Bacterial Nod factors (NFs) and plant regulatory pathways modulating NF signalling control rhizobial infections and nodulation efficiency. Here we show that gibberellin (GA) signalling mediated by DELLA proteins inhibits rhizobial infections and controls the NF induction of the infection marker ENOD11 in Medicago truncatula. Ectopic expression of a constitutively active DELLA protein in the epidermis is sufficient to promote ENOD11 expression in the absence of symbiotic signals. We show using heterologous systems that DELLA proteins can interact with the nodulation signalling pathway 2 (NSP2) and nuclear factor-YA1 (NF-YA1) transcription factors that are essential for the activation of NF responses. Furthermore, MtDELLA1 can bind the ERN1 (ERF required for nodulation 1) promoter and positively transactivate its expression. Overall, we propose that GA-dependent action of DELLA proteins may directly regulate the NSP1/NSP2 and NF-YA1 activation of ERN1 transcription to regulate rhizobial infections.
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