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https://hdl.handle.net/20.500.14279/9126
Τίτλος: | Polyamine oxidase 5 loss-of-function mutations in Arabidopsis thaliana trigger metabolic and transcriptional reprogramming and promote salt stress tolerance | Συγγραφείς: | Zarza, Xavier Atanasov, Kostadin E. Marco, Francisco Arbona, Vicent Carrasco, Pedro Kopka, Joachim Fotopoulos, Vasileios Munnik, Teun Gómez-Cadenas, Aurelio Tiburcio, Antonio F. Alcázar, Rubén |
Major Field of Science: | Agricultural Sciences | Field Category: | Agriculture Forestry and Fisheries | Λέξεις-κλειδιά: | Jasmonates;Polyamines;Metabolomics;Salt tolerance;Thermospermine | Ημερομηνία Έκδοσης: | Απρ-2017 | Πηγή: | Plant, Cell and Environment, 2017, vol. 40, no. 4, pp. 527-542 | Volume: | 40 | Issue: | 4 | Start page: | 527 | End page: | 542 | Περιοδικό: | Plant, Cell and Environment | Περίληψη: | The family of polyamine oxidases (PAO) in Arabidopsis (AtPAO1-5) mediates polyamine (PA) back-conversion, which reverses the PA biosynthetic pathway from spermine and its structural isomer thermospermine (tSpm) into spermidine and then putrescine. Here, we have studied the involvement of PA back-conversion in Arabidopsis salinity tolerance. AtPAO5 is the Arabidopsis PAO gene member most transcriptionally induced by salt stress. Two independent loss-of-function mutants (atpao5-2 and atpao5-3) were found to exhibit constitutively higher tSpm levels, with associated increased salt tolerance. Using global transcriptional and metabolomic analyses, the underlying mechanisms were studied. Stimulation of abscisic acid and jasmonate (JA) biosynthesis and accumulation of important compatible solutes, such as sugars, polyols and proline, as well as TCA cycle intermediates were observed in atpao5 mutants under salt stress. Expression analyses indicate that tSpm modulates the transcript levels of several target genes, including many involved in the biosynthesis and signalling of JA, some of which are already known to promote salinity tolerance. Transcriptional modulation by tSpm is isomer-dependent, thus demonstrating the specificity of this response. Overall, we conclude that tSpm triggers metabolic and transcriptional reprogramming that promotes salt stress tolerance in Arabidopsis. | URI: | https://hdl.handle.net/20.500.14279/9126 | ISSN: | 13653040 | DOI: | 10.1111/pce.12714 | Rights: | © Wiley | Type: | Article | Affiliation: | University of Barcelona University of Amsterdam Universidad de Valencia Universitat Jaume I Max Planck Institute Cyprus University of Technology |
Publication Type: | Peer Reviewed |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
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