Journal
PHYSIOLOGIA PLANTARUM
Volume 160, Issue 4, Pages 410-424Publisher
WILEY
DOI: 10.1111/ppl.12558
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Funding
- Ministerio de Economia y Competitividad, Spain [AGL2015-66434-R]
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Regulation of essential macronutrients acquisition by plants in response to their availability is a key process for plant adaptation to changing environments. Here we show in tomato and Arabidopsis plants that when they are subjected to NO3-, PO43- and SO42- deprivation, low-affinity K+ uptake and K+ translocation to the shoot are reduced. In parallel, these nutritional deficiencies produce reductions in the messenger levels of the genes encoding the main systems for low-affinity K+ uptake and K+ translocation, i.e. AKT1 and SKOR in Arabidopsis and LKT1 and the tomato homolog of SKOR, SlSKOR in tomato, respectively. The results suggest that the shortage of one nutrient produces a general downregulation of the acquisition of other nutrients. In the case of K+ nutrient, one of the mechanisms for such a response resides in the transcriptional repression of the genes encoding the systems for K+ uptake and translocation.
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