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• W1489231654 abstract "Plant uptake rates of nitrate and potassium (K) are under feedback control from plant concentrations of nitrogen (N) and K, respectively. However, there is uncertainty concerning the interactions between nitrate and K uptake. We tested the hypothesis that plant concentrations of N affect K uptake and plant concentrations of K affect uptake rates of nitrate. Two experiments were carried out with wheat. Each consisted of three phases. In Phase 1, the plants were grown in complete nutrient solution for 17–18 days. In Phase 2, nitrate and K treatments were imposed – the plants were either starved of the nutrient or provided excess for 2.5 or 5 days. This generated plants of similar size but with different N and K concentrations. In Phase 3, complete nutrient solutions were restored for all plants and nitrate and K uptake was followed for 8 h. Uptake till the end of Phases 2 and 3 was examined by analysis of variance. Uptake during Phase 3 was also examined using a simple model that included Michaelis-Menten uptake kinetics and feedback control due to whole-plant N and K concentrations, but assumed no interaction between nitrate and K uptake. The model was fitted using Phase 3 measurements of nitrate uptake following nitrate starvation or excess and K uptake following K starvation or excess. There was little influence of plant N on K uptake or of plant K on nitrate uptake for periods that started with adequate plant concentrations of N and K (Phases 1 and 2). However, in Phase 3 when N starvation was broken, the plants took up more K than controls and model predictions, so feedback control of K uptake had been lessened. Similarly, when K starvation was broken, feedback control of nitrate uptake was lessened. If plants had endured both N and K starvation then on release of that they took up more K but less nitrate than predicted by the model. These results support the hypothesis under test, and suggest interactions between the mechanisms that regulate uptake of nitrate and K." @default.
• W1489231654 created "2016-06-24" @default.
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• W1489231654 creator A5051876854 @default.
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• W1489231654 date "2015-08-03" @default.
• W1489231654 modified "2023-10-10" @default.
• W1489231654 title "Nitrogen or potassium preconditioning affects uptake of both nitrate and potassium in young wheat (<i>Triticum aestivum</i>)" @default.
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• W1489231654 doi "https://doi.org/10.1111/aab.12243" @default.
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