The Arabidopsis PIP1;1 Aquaporin Represses Lateral Root Development and Nitrate Uptake Under Low Nitrate Availability
2025
Schley, Thayssa, Rabelo | Zhu, Ting | Geist, Birgit | Crabos, Amandine | Dietrich, Daniela | Alandes, Regina, A | Bennett, Malcolm | Nacry, Philippe | Schäffner, Anton, R | Institute of Biomathematics and Biometry - Helmholtz Zentrum München (IBB) ; Helmholtz Zentrum München = German Research Center for Environmental Health (HMGU) | Institut des Sciences des Plantes de Montpellier (IPSIM) ; Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM) | University of Nottingham, UK (UON) | Plant & Crop Sciences, School of Biosciences ; University of Nottingham, UK (UON)
International audience
Mostrar más [+] Menos [-]Inglés. Nitrate (NO 3 -) deficiency decreases root water uptake and root hydraulic conductance. This adaptive response is correlated with reduced abundance and activity of plasma membrane intrinsic protein (PIP) aquaporins. We therefore screened changes in the root architecture of a complete set of Arabidopsis pip loss-of-function mutants grown under NO 3 -deficiency to systematically approach the impact of PIPs under these conditions. NO 3 -deprivation led to attenuated responses of specific pip single mutants compared to the strongly altered LR parameters of wild-type plants. In particular, pip1;1 exhibited a lower relative reduction in LR length and LR density, revealing that PIP1;1 represses LR development when NO 3 -is scarce. Indeed, PIP1;1 compromises root and shoot NO 3 -accumulation during early developmental stages. A fluorescent VENUS-PIP1;1 fusion revealed that PIP1;1 is specifically repressed in the pericycle, endodermis and at the flanks of emerging LRs upon NO 3 deficiency. Thus, LR plasticity and NO 3 -uptake are affected by an interactive mechanism involving aquaporins (PIP1;1) and nitrate accumulation during seedling development under NO 3 --deficient conditions.
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