Identification of molecular integrators shows that nitrogen actively controls the phosphate starvation response in plants
2019
Medici, Anna | Szponarski, Wojciech | Dangeville, Pierre | Safi, Alaeddine | Dissanayake, Indeewari Madhubhashini | Saenchai, Chorpet | Emanuel, Amélie | Rubio, Vicente | Lacombe, Benoît | Ruffel, Sandrine | Tanurdžić, Miloš | Rouached, Hatem | Krouk, Gabriel | Biochimie et Physiologie Moléculaire des Plantes (BPMP) ; Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Centre for Marine Science, School of Biological Sciences, University of Queensland ; The University of Queensland (UQ [All campuses : Brisbane, Dutton Park Gatton, Herston, St Lucia and other locations]) | Centro Nacional de Biotecnología [Madrid] (CNB-CSIC) ; Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | The Centre National de la Recherche Scientifique (CNRS LIA-CoopNet to G.K.), and by the National Science Foundation (NSF IOS 1339362-NutriNet). Research in V.R.’s laboratory was funded by the Ministry of Economy and Competitiveness and AEI/FEDER/European (grants BIO2013-46539-R and BIO2016-80551-R). | ANR-14-CE19-0008,IMANA,Identification de régulations moléculaires majeures impliquées dans l'adaptation des plantes à la disponibilité en azote(2014)
International audience
Afficher plus [+] Moins [-]anglais. Nitrogen (N) and phosphorus (P) are key macronutrients sustaining plant growth and crop yield, and ensuring food security worldwide. Understanding how plants perceive and interpret the combinatorial nature of these signals thus has important agricultural implications within the context of: i) increased food demand, ii) limited P supply, and iii) environmental pollution due to N fertilizer usage. Here we report the discovery of an active control of P Starvation Responses (PSR) by a combination of local and long-distance N signaling pathways in plants. We show that, in Arabidopsis thaliana, the nitrate transceptor CHLORINA 1/ NITRATE TRANSPORTER 1.1 (CHL1/NRT1.1) is a component of this signaling crosstalk. We also demonstrate that this crosstalk is dependent on the control of the accumulation and turnover by N of the transcription factor PHOSPHATE STARVATION RESPONSE 1/PHR1, a master regulator of P sensing and signaling. We further show an important role of PHOSPHATE 2/PHO2 as an integrator of the N availability into the PSR since the effect of N on PSR is strongly affected in pho2 mutants. We finally show that PHO2 and NRT1.1 influence each other's transcript levels. These observations are summarized in a model representing a framework with several entry points where N signal influence PSR. Finally, we demonstrate that this phenomenon is conserved in rice (Oryza sativa) and wheat (Triticum aestivum) opening biotechnological perspectives in crop plants.
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