Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 163, Issue -, Pages 201-204Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2021.04.002
Keywords
Potassium; Deficiency; Metabolomics; Salicylic acid; CBL-CIPK regulation
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Funding
- Region Pays de la Loire
- Angers Loire Metropole
- Fundacion Seneca de la Region de Murcia, Spain [20806/PI/18]
- Ministerio de Ciencia e Innovacion, Spain [PID2019-106649RB-I00]
- Red de Excelencia from Ministerio de Economia, Industria y Competitividad [BIO2016-81957-REDT]
- FEDER Fund
- Ramon y Cajal Fellowship from Ministerio de Economia y Competitividad, Spain [RyC-2017-21924]
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The study found that when nutrient conditions in Arabidopsis changed from sufficient potassium to potassium deficiency, mutants exhibited a metabolomics pattern similar to potassium-deficient wild-type, showing a constitutive metabolic response to low potassium. The results suggest that early events in the response to low potassium conditions involve salicylic acid metabolism.
Potassium (K) deficiency has consequences not only on cellular ion balance and transmembrane potential but also on metabolism. In fact, several enzymes are K-dependent including enzymes in catabolism, causing an alteration in glycolysis and respiration. In addition, K deficiency is associated with the induction of specific pathways and accumulation of metabolic biomarkers, such as putrescine. However, such drastic changes are usually observed when K deficiency is established. Here, we carried out a kinetic analysis with metabolomics to elucidate early metabolic events when nutrient conditions change from K-sufficiency to K-deficiency in Arabidopsis rosettes from both wild type and mutants affected in both K absorption and low-K signalling (hak5 akt1 cipk23). Our results show that mutants have a metabolomics pattern similar to K-deficient wild-type, showing a constitutive metabolic response to low K. In addition, shifting to low K conditions induces (i) changes in sugar metabolism and (ii) an accumulation of salicylic acid metabolites before the appearance of biomarkers of K deficiency (putrescine and aconitate), and such an accumulation is more pronounced in mutants. Our results suggest that early events in the response to low K conditions involve salicylic acid metabolism.
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