Localized osmotic stress activates systemic responses to N limitation in Medicago truncatula-Sinorhizobium symbiotic plants.

Autor:	Martin ML; Université Paris-Saclay, CNRS, INRAE, Univ d'Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France.; Université Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France.; Université Paris-Saclay, AgroParisTech, INRAE, UMR MIA, Paris-Saclay, Palaiseau, France., Pervent M; LSTM, Laboratoire des Symbioses Tropicales et Méditerranéennes, INRAE, IRD, CIRAD, Institut Agro Montpellier, Université de Montpellier, Montpellier, France.; PHIM Plant Health Institute, INRAE, Université de Montpellier, CIRAD, Institut Agro, IRD, Montpellier, France., Lambert I; LSTM, Laboratoire des Symbioses Tropicales et Méditerranéennes, INRAE, IRD, CIRAD, Institut Agro Montpellier, Université de Montpellier, Montpellier, France., Colella S; LSTM, Laboratoire des Symbioses Tropicales et Méditerranéennes, INRAE, IRD, CIRAD, Institut Agro Montpellier, Université de Montpellier, Montpellier, France.; PHIM Plant Health Institute, INRAE, Université de Montpellier, CIRAD, Institut Agro, IRD, Montpellier, France., Tancelin M; LSTM, Laboratoire des Symbioses Tropicales et Méditerranéennes, INRAE, IRD, CIRAD, Institut Agro Montpellier, Université de Montpellier, Montpellier, France., Severac D; MGX, CNRS, INSERM, Université de Montpellier, Montpellier, France., Clément G; Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France., Tillard P; Biologie et Physiologie Moléculaire des Plantes, INRAE, CNRS, Institut Agro Montpellier, Université de Montpellier, Montpellier, France., Frugier F; Université Paris-Saclay, CNRS, INRAE, Univ d'Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France.; Université Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France., Lepetit M; LSTM, Laboratoire des Symbioses Tropicales et Méditerranéennes, INRAE, IRD, CIRAD, Institut Agro Montpellier, Université de Montpellier, Montpellier, France.; Institut Sophia Agrobiotech, INRAE, CNRS, Université Côte d'Azur, Sophia-Antipolis, France.
Jazyk:	angličtina
Zdroj:	Frontiers in plant science [Front Plant Sci] 2023 Nov 20; Vol. 14, pp. 1288070. Date of Electronic Publication: 2023 Nov 20 (Print Publication: 2023).
DOI:	10.3389/fpls.2023.1288070
Abstrakt:	In mature symbiotic root nodules, differentiated rhizobia fix atmospheric dinitrogen and provide ammonium to fulfill the plant nitrogen (N) demand. The plant enables this process by providing photosynthates to the nodules. The symbiosis is adjusted to the whole plant N demand thanks to systemic N signaling controlling nodule development. Symbiotic plants under N deficit stimulate nodule expansion and activate nodule senescence under N satiety. Besides, nodules are highly sensitive to drought. Here, we used split-root systems to characterize the systemic responses of symbiotic plants to a localized osmotic stress. We showed that polyéthylène glycol (PEG) application rapidly inhibited the symbiotic dinitrogen fixation activity of nodules locally exposed to the treatment, resulting to the N limitation of the plant supplied exclusively by symbiotic dinitrogen fixation. The localized PEG treatment triggered systemic signaling stimulating nodule development in the distant untreated roots. This response was associated with an enhancement of the sucrose allocation. Our analyses showed that transcriptomic reprogramming associated with PEG and N deficit systemic signaling(s) shared many targets transcripts. Altogether, our study suggests that systemic N signaling is a component of the adaptation of the symbiotic plant to the local variations of its edaphic environment. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2023 Martin, Pervent, Lambert, Colella, Tancelin, Severac, Clément, Tillard, Frugier and Lepetit.)
Databáze:	MEDLINE
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