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Santin A, Russo MT, de Los Ríos LM, Chiurazzi M, d'Alcalà MR, Lacombe B, Ferrante MI, Rogato A. The tonoplast localized protein PtNPF1 participates in the regulation of nitrogen response in diatoms. New Phytol 2024; 241:1592-1604. [PMID: 38084038 DOI: 10.1111/nph.19461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 11/21/2023] [Indexed: 01/26/2024]
Abstract
Diatoms are a highly successful group of phytoplankton, well adapted also to oligotrophic environments and capable of handling nutrient fluctuations in the ocean, particularly nitrate. The presence of a large vacuole is an important trait contributing to their adaptive features. It confers diatoms the ability to accumulate and store nutrients, such as nitrate, when they are abundant outside and then to reallocate them into the cytosol to meet deficiencies, in a process called luxury uptake. The molecular mechanisms that regulate these nitrate fluxes are still not known in diatoms. In this work, we provide new insights into the function of Phaeodactylum tricornutum NPF1, a putative low-affinity nitrate transporter. To accomplish this, we generated overexpressing strains and CRISPR/Cas9 loss-of-function mutants. Microscopy observations confirmed predictions that PtNPF1 is localized on the vacuole membrane. Furthermore, functional characterizations performed on knock-out mutants revealed a transient growth delay phenotype linked to altered nitrate uptake. Together, these results allowed us to hypothesize that PtNPF1 is presumably involved in modulating intracellular nitrogen fluxes, managing intracellular nutrient availability. This ability might allow diatoms to fine-tune the assimilation, storage and reallocation of nitrate, conferring them a strong advantage in oligotrophic environments.
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Affiliation(s)
- Anna Santin
- Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, 80121, Italy
| | | | - Laura Morales de Los Ríos
- Institute for Plant Science of Montpellier (IPSiM), University of Montpellier, CNRS, INRAE, Montpellier SupAgro, Place Pierre Viala 2, Montpellier, 34060, France
| | - Maurizio Chiurazzi
- Institute of Biosciences and BioResources, CNR, Via P. Castellino 111, Naples, 80131, Italy
| | | | - Benoît Lacombe
- Institute for Plant Science of Montpellier (IPSiM), University of Montpellier, CNRS, INRAE, Montpellier SupAgro, Place Pierre Viala 2, Montpellier, 34060, France
| | - Maria Immacolata Ferrante
- Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, 80121, Italy
- National Institute of Oceanography and Applied Geophysics, Trieste, 34010, Italy
| | - Alessandra Rogato
- Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, 80121, Italy
- Institute of Biosciences and BioResources, CNR, Via P. Castellino 111, Naples, 80131, Italy
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Morales de Los Ríos L, Corratgé-Faillie C, Raddatz N, Mendoza I, Lindahl M, de Angeli A, Lacombe B, Quintero FJ, Pardo JM. The Arabidopsis protein NPF6.2/NRT1.4 is a plasma membrane nitrate transporter and a target of protein kinase CIPK23. Plant Physiol Biochem 2021; 168:239-251. [PMID: 34656860 DOI: 10.1016/j.plaphy.2021.10.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/07/2021] [Accepted: 10/09/2021] [Indexed: 05/02/2023]
Abstract
Nitrate and potassium nutrition is tightly coordinated in vascular plants. Physiological and molecular genetics studies have demonstrated that several NPF/NRT1 nitrate transporters have a significant impact on both uptake and the root-shoot partition of these nutrients. However, how these traits are biochemically connected remain controversial since some NPF proteins, e.g. NPF7.3/NRT1.5, have been suggested to mediate K+/H+ exchange instead of nitrate fluxes. Here we show that NPF6.2/NRT1.4, a protein that gates nitrate accumulation at the leaf petiole of Arabidopsis thaliana, also affects the root/shoot distribution of potassium. We demonstrate that NPF6.2/NRT1.4 is a plasma membrane nitrate transporter phosphorylated at threonine-98 by the CIPK23 protein kinase that is a regulatory hub for nitrogen and potassium nutrition. Heterologous expression of NPF6.2/NRT1.4 and NPF7.3/NRT1.5 in yeast mutants with altered potassium uptake and efflux systems showed no evidence of nitrate-dependent potassium transport by these proteins.
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Affiliation(s)
- Laura Morales de Los Ríos
- Institute of Plant Biochemistry and Photosyntheis (IBVF), Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, 41092, Seville, Spain
| | - Claire Corratgé-Faillie
- Biochimie et Physiologie Moléculaire des Plantes, Univ. Montpellier, CNRS, INRAE, 34060, Montpellier Cedex, France
| | - Natalia Raddatz
- Institute of Plant Biochemistry and Photosyntheis (IBVF), Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, 41092, Seville, Spain
| | - Imelda Mendoza
- Institute of Plant Biochemistry and Photosyntheis (IBVF), Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, 41092, Seville, Spain
| | - Marika Lindahl
- Institute of Plant Biochemistry and Photosyntheis (IBVF), Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, 41092, Seville, Spain
| | - Alexis de Angeli
- Biochimie et Physiologie Moléculaire des Plantes, Univ. Montpellier, CNRS, INRAE, 34060, Montpellier Cedex, France
| | - Benoit Lacombe
- Biochimie et Physiologie Moléculaire des Plantes, Univ. Montpellier, CNRS, INRAE, 34060, Montpellier Cedex, France
| | - Francisco J Quintero
- Institute of Plant Biochemistry and Photosyntheis (IBVF), Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, 41092, Seville, Spain
| | - José M Pardo
- Institute of Plant Biochemistry and Photosyntheis (IBVF), Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, 41092, Seville, Spain.
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Sánchez-Elordi E, de Los Ríos LM, Vicente C, Legaz ME. Polyamines levels increase in smut teliospores after contact with sugarcane glycoproteins as a plant defensive mechanism. J Plant Res 2019; 132:405-417. [PMID: 30864048 DOI: 10.1007/s10265-019-01098-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 02/12/2019] [Indexed: 06/09/2023]
Abstract
Previous studies have already highlighted the correlation between Sporisorium scitamineum pathogenicity and sugarcane polyamine accumulation. It was shown that high infectivity correlates with an increase in the amount of spermidine, spermine and cadaverine conjugated to phenols in the sensitive cultivars whereas resistant plants mainly produce free putrescine. However, these previous studies did not clarify the role of these polyamides in the disorders caused to the plant. Therefore, the purpose of this research is to clarify the effect of polyamines on the development of smut disease. In this paper, commercial polyamines were firstly assayed on smut teliospores germination. Secondly, effects were correlated to changes in endogenous polyamines after contact with defense sugarcane glycoproteins. Low concentrations of spermidine significantly activated teliospore germination, while putrescine had no activating effect on germination. Interestingly, it was observed that the diamine caused nuclear decondensation and breakage of the teliospore cell wall whereas the treatment of teliospores with spermidine did not induce nuclear decondensation or cell wall breakdown. Moreover, the number of polymerized microtubules increased in the presence of 7.5 mM spermidine but it decreased with putrescine which indicates that polyamines effects on Sporisorium scitamineum teliospore germination could be mediated through microtubules interaction. An increased production of polyamines in smut teliospores has been related to sugarcane resistance to the disease. Teliospores incubation with high molecular mass glycoproteins (HMMG) from the uninoculated resistant variety of sugarcane, Mayari 55-14, caused an increase of the insoluble fraction of putrescine, spermidine and spermine inside the teliospore cells. Moreover, the level of the soluble fraction of spermidine (S fraction) increased inside teliospores and the excess was released to the medium. The HMMG glycoproteins purified from Mayarí 55-14 plants previously inoculated with the pathogen significantly increased the levels of both retained and secreted soluble putrescine and spermidine. Polyamines levels did not increase in teliospores after incubation with HMMG produced by non resistant variety Barbados 42231 which could be related to the incapacity of these plants to defend themselves against smut disease. Thus, a hypothesis about the role of polyamines in sugarcane-smut interaction is explained.
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Affiliation(s)
- Elena Sánchez-Elordi
- Team of Cell Interactions in Plant Symbioses, Faculty of Biology, Complutense University, 12, José Antonio Novais Av., 28040, Madrid, Spain
| | - Laura Morales de Los Ríos
- Team of Cell Interactions in Plant Symbioses, Faculty of Biology, Complutense University, 12, José Antonio Novais Av., 28040, Madrid, Spain
| | - Carlos Vicente
- Team of Cell Interactions in Plant Symbioses, Faculty of Biology, Complutense University, 12, José Antonio Novais Av., 28040, Madrid, Spain.
| | - María-Estrella Legaz
- Team of Cell Interactions in Plant Symbioses, Faculty of Biology, Complutense University, 12, José Antonio Novais Av., 28040, Madrid, Spain
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