Early transcriptomic changes induced by magnesium deficiency in Arabidopsis thaliana reveal the alteration of circadian clock gene expression in roots and the triggering of abscisic acid-responsive genes.
*Plant growth and development ultimately depend on environmental variables such as the availability of essential minerals. Unravelling how nutrients affect gene expression will help to understand how they regulate plant growth. *This study reports the early transcriptomic response to magnesium (Mg) deprivation in Arabidopsis. Whole-genome transcriptome was studied in the roots and young mature leaves 4, 8 and 28 h after the removal of Mg from the nutrient solution. *The highest number of regulated genes was first observed in the roots. Contrary to other mineral deficiencies, Mg depletion did not induce a higher expression of annotated genes in Mg uptake. Remarkable responses include the perturbation of the central oscillator of the circadian clock in roots and the triggering of abscisic acid (ABA) signalling, with half of the up-regulated Mg genes in leaves being ABA-responsive. However, no change in ABA content was observed. *The specificity of the response of some Mg-regulated genes was challenged by studying their expression after other mineral deficiencies and environmental stresses. The possibility to develop markers for Mg incipient deficiency is discussed here.
Hermans
Christian
C
Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, Bd du Triomphe, B-1050 Brussels, Belgium.
Vuylsteke
Marnik
M
Department of Plant Systems Biology, VIB, B-9052 Ghent, Belgium.|Department of Plant Biotechnology and Genetics, Ghent University, B-9052 Ghent, Belgium.
Coppens
Frederik
F
Department of Plant Systems Biology, VIB, B-9052 Ghent, Belgium.|Department of Plant Biotechnology and Genetics, Ghent University, B-9052 Ghent, Belgium.
Craciun
Adrian
A
Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, Bd du Triomphe, B-1050 Brussels, Belgium.
Inzé
Dirk
D
Department of Plant Systems Biology, VIB, B-9052 Ghent, Belgium.|Department of Plant Biotechnology and Genetics, Ghent University, B-9052 Ghent, Belgium.
Verbruggen
Nathalie
N
Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, Bd du Triomphe, B-1050 Brussels, Belgium.
D000040:Abscisic Acid / Q000494:pharmacology*; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development; D001683:Biological Clocks / Q000187:drug effects / Q000235:genetics; D015415:Biomarkers / Q000378:metabolism; D002940:Circadian Rhythm / Q000187:drug effects / Q000235:genetics*; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D017343:Genes, Plant / Q000235:genetics; D008274:Magnesium / Q000378:metabolism* / Q000494:pharmacology; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics; D018517:Plant Roots / Q000187:drug effects / Q000235:genetics*; D015203:Reproducibility of Results; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics; D013997:Time Factors
D015415:Biomarkers; D000040:Abscisic Acid; D008274:Magnesium
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