DELLA-mediated gibberellin signalling regulates Nod factor signalling and rhizobial infection

Camille Fonouni-Farde, Sovanna Tan, Maël Baudin, Mathias Brault, Jiangqi Wen, Kirankumar S. Mysore, Andreas Niebel, Florian Frugier () and Anouck Diet
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Camille Fonouni-Farde: Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Univ Paris-Diderot, Univ Paris Sud, INRA, Univ Evry, Sorbonne Paris-Cité, Université Paris-Saclay
Sovanna Tan: Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Univ Paris-Diderot, Univ Paris Sud, INRA, Univ Evry, Sorbonne Paris-Cité, Université Paris-Saclay
Maël Baudin: Laboratoire des Interactions Plantes-Microorganismes (LIPM), INRA, CNRS
Mathias Brault: Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Univ Paris-Diderot, Univ Paris Sud, INRA, Univ Evry, Sorbonne Paris-Cité, Université Paris-Saclay
Jiangqi Wen: The Samuel Roberts Noble Foundation
Kirankumar S. Mysore: The Samuel Roberts Noble Foundation
Andreas Niebel: Laboratoire des Interactions Plantes-Microorganismes (LIPM), INRA, CNRS
Florian Frugier: Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Univ Paris-Diderot, Univ Paris Sud, INRA, Univ Evry, Sorbonne Paris-Cité, Université Paris-Saclay
Anouck Diet: Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, Univ Paris-Diderot, Univ Paris Sud, INRA, Univ Evry, Sorbonne Paris-Cité, Université Paris-Saclay

Nature Communications, 2016, vol. 7, issue 1, 1-13

Abstract: Abstract 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.

Date: 2016
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DOI: 10.1038/ncomms12636

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