Systemic control of nodule formation by plant nitrogen demand requires autoregulation-dependent and independent mechanisms

Author:

Pervent Marjorie1ORCID,Lambert Ilana1,Tauzin Marc1,Karouani Alicia1,Nigg Martha1,Jardinaud Marie-Françoise2ORCID,Severac Dany3,Colella Stefano1ORCID,Martin-Magniette Marie-Laure456ORCID,Lepetit Marc17ORCID

Affiliation:

1. Laboratoire des Symbioses Tropicales et Méditérranéennes INRAE, IRD, CIRAD, Montpellier SupAgro, Université de Montpellier, Montpellier, France

2. Laboratoire des Interactions Plantes Microorganismes INRAE, CNRS, Université de Toulouse, Castanet-Tolosan, France

3. MGX, CNRS, INSERM, Université de Montpellier, Montpellier, France

4. Université Paris-Saclay, CNRS, INRAE, Université d’Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Orsay, France

5. Université de Paris, CNRS, INRAE, Institute of Plant Sciences Paris Saclay (IPS2), Orsay, France

6. UMR MIA-Paris, AgroParisTech, INRAE, Université Paris-Saclay, Paris, France

7. Institut Sophia Agrobiotech, INRAE, Université Côte d’Azur, CNRS, Sophia-Antipolis, France

Abstract

Abstract In legumes interacting with rhizobia, the formation of symbiotic organs involved in the acquisition of atmospheric nitrogen gas (N2) is dependent on the plant nitrogen (N) demand. We used Medicago truncatula plants cultivated in split-root systems to discriminate between responses to local and systemic N signaling. We evidenced a strong control of nodule formation by systemic N signaling but obtained no clear evidence of a local control by mineral nitrogen. Systemic signaling of the plant N demand controls numerous transcripts involved in root transcriptome reprogramming associated with early rhizobia interaction and nodule formation. SUPER NUMERIC NODULES (SUNN) has an important role in this control, but we found that major systemic N signaling responses remained active in the sunn mutant. Genes involved in the activation of nitrogen fixation are regulated by systemic N signaling in the mutant, explaining why its hypernodulation phenotype is not associated with higher nitrogen fixation of the whole plant. We show that the control of transcriptome reprogramming of nodule formation by systemic N signaling requires other pathway(s) that parallel the SUNN/CLE (CLAVATA3/EMBRYO SURROUNDING REGION-LIKE PEPTIDES) pathway.

Funder

Agence Nationale de la Recherche

LabEx Saclay Plant Sciences-SPS

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Physiology

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