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  Down-regulation of a Mitochondrial NAD+ Transporter (NDT2) Alters Seed Production and Germination in Arabidopsis

Feitosa-Araujo, E., Chaves, I. d. S., Florian, A., da Fonseca-Pereira, P., Apfata, J. A. C., Heyneke, E., et al. (2020). Down-regulation of a Mitochondrial NAD+ Transporter (NDT2) Alters Seed Production and Germination in Arabidopsis. Plant and Cell Physiology, 61(5), 897-908. doi:10.1093/pcp/pcaa017.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-65E3-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-65E4-7
Genre: Journal Article

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Feitosa-Araujo, Elias1, Author
Chaves, Izabel de Souza1, Author
Florian, A.2, Author              
da Fonseca-Pereira, Paula1, Author
Apfata, Jorge Alberto Condori1, Author
Heyneke, E.2, Author              
Medeiros, D.B.2, Author              
Pires, Marcel Viana1, Author
Mettler-Altmann, Tabea1, Author
Neuhaus, H Ekkehard1, Author
Palmieri, Ferdinando1, Author
Araújo, Wagner L1, Author
Obata, T.2, Author              
Weber, Andreas P M1, Author
Linka, Nicole1, Author
Fernie, A. R.2, Author              
Nunes-Nesi, Adriano1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              

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 Abstract: Despite the fundamental importance of nicotinamide adenine dinucleotide (NAD+) for metabolism, the physiological roles of NAD+ carriers in plants remains unclear. We previously characterized the Arabidopsis thaliana gene (At1g25380), named AtNDT2, encoding a protein located in the mitochondrial inner membrane, which imports NAD+ from the cytosol using ADP and AMP as counter-exchange substrates for NAD+. Here we further investigated the physiological roles of NDT2, by isolating a T-DNA insertion line, generating an antisense line and characterizing these genotypes in detail. Reduced NDT2 expression affected reproductive phase by reducing total seed yield. Additionally, reduced seed germination and retardation in seedling establishment were observed in the mutant lines. Moreover, remarkably changes on primary metabolism were observed in dry and germinated seeds and an increase in fatty acid levels was verified during seedling establishment. Furthermore, flowers and seedlings of NDT2 mutants displayed up-regulation of de novo and salvage pathway genes encoding for NAD+ biosynthesis enzymes, demonstrating the transcriptional control mediated by NDT2 activity over these genes. Taken together, our results suggest that NDT2 expression is fundamental for maintaining NAD+ balance among organelles that modulate metabolism, physiology and developmental processes of heterotrophic tissues.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1093/pcp/pcaa017
BibTex Citekey: 10.1093/pcp/pcaa017
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Title: Plant and Cell Physiology
  Other : Plant Cell Physiol.
Source Genre: Journal
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Publ. Info: Kyoto [etc.] : Japanese Society of Plant Physiologists.
Pages: - Volume / Issue: 61 (5) Sequence Number: - Start / End Page: 897 - 908 Identifier: ISSN: 0032-0781
CoNE: https://pure.mpg.de/cone/journals/resource/954925434423