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Involvement of salicylic acid in the response to potassium deficiency revealed by metabolomics

Abstract : 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 Arabi-dopsis 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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Submitted on : Thursday, May 6, 2021 - 5:00:45 PM
Last modification on : Friday, May 7, 2021 - 3:35:37 AM




Jing Cui, Manuel Nieves-Cordones, Francisco Rubio, Guillaume Tcherkez. Involvement of salicylic acid in the response to potassium deficiency revealed by metabolomics. Plant Physiology and Biochemistry, Elsevier, 2021, 163 (5), pp.201-204. ⟨10.1016/j.plaphy.2021.04.002⟩. ⟨hal-03219820⟩



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