A Model for the Regulation of K<sup>+</sup> Influx, and Tissue Potassium Concentrations by Negative Feedback Effects upon Plasmalemma Influx

Siddiqi, M. Yaeesh; Glass, Anthony D. M.

doi:10.1104/pp.81.1.1

Cited by 39 publications

(18 citation statements)

References 26 publications

(19 reference statements)

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“…No difference was evident in the concentrations of potassium in plant tissues between the four treatments. This reflects the ability of plants to acclimatise to a wide range of external concentrations of potassium in the long-term [18]. This was also observed in hydroponic experiments with both spring wheat and broad bean [5].…”

Section: Concentrations Of Potassium and 137 Cs In Wheatmentioning

confidence: 80%

Effect of potassium (K) supply on the uptake of 137 Cs by spring wheat ( Triticum aestivum cv. Tonic): a lysimeter study

Zhu

Shaw

Nisbet³

et al. 2000

Radiation and Environmental Biophysics

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A lysimeter experiment was carried out on a relatively infertile soil to examine the effect of potassium fertiliser application on the uptake of radiocaesium by spring wheat. Porous ceramic cups were used to obtain samples of soil solution. Results showed that the uptake of radiocaesium by spring wheat was reduced by the addition of potassium. However this inhibitory effect was less marked at later stages of plant growth due to factors such as the spatial variability of potassium within the soil, differences in root distribution down the soil profile and age-related demand for potassium by the plant. There was some evidence that a negative power function could be used to describe the relationship between the concentration of 137Cs in the plant and concentrations of potassium or 137Cs:K quotients in soil solution over the whole experimental period. Practical implications of potassium fertilisation in terms of reducing uptake of radiocaesium by crops are discussed.

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Section: Concentrations Of Potassium and 137 Cs In Wheatmentioning

confidence: 80%

Effect of potassium (K) supply on the uptake of 137 Cs by spring wheat ( Triticum aestivum cv. Tonic): a lysimeter study

Zhu

Shaw

Nisbet³

et al. 2000

Radiation and Environmental Biophysics

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“…The magnitude of HATS-mediated K + influx has been shown to be inversely correlated with tissue K + content (Glass, 1976; Kochian and Lucas, 1982;Siddiqi and Glass, 1986), although it is unclear how plants interpret K + status and adjust transport rates appropriately. HATS-mediated K + influx is also severely reduced by NH 4 + provision (Scherer et al, 1984;Vale et al, 1987Vale et al, , 1988aWang et al, 1996;Spalding et al, 1999;Santa-María et al, 2000;Bañuelos et al, 2002;Kronzucker et al, 2003;Martínez-Cordero et al, 2004;Szczerba et al, 2006Szczerba et al, , 2008bNieves-Cordones et al, 2007), such that reduced K + uptake and accumulation in the presence of NH 4 + is a characteristic symptom of NH 4 + toxicity (Kirkby, 1968;Van Beusichem et al, 1988;Peuke and Jeschke, 1993;Gerendás et al, 1997;Hirsch et al, 1998;Britto and Kronzucker, 2002;Martínez-Cordero et al, 2005).…”

Section: High-affinity K + Transportmentioning

confidence: 98%

K+ transport in plants: Physiology and molecular biology

Szczerba

Britto

Kronzucker

2009

Journal of Plant Physiology

208

132

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“…These constants may change as a function of internal factors (e.g. internal tissue ion concentration) (Siddiqi and Glass 1986), climate conditions (e.g. temperature or light intensity) (Wheeler et al 1998), plant development phase (Sharifi and Zebarth 2006) and interaction with other ions (e.g.…”

Section: Michaelis-menten Kineticsmentioning

confidence: 99%

Effects of saline root environment (NaCl) on nitrate and potassium uptake kinetics for rose plants: a Michaelis–Menten modelling approach

2008

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Greenhouse-grown cut flower roses are often irrigated with moderately saline irrigation water. The salt/ballast ions are either present initially in poor quality raw water or reclaimed municipal water, or accumulated in greenhouse irrigation water that is captured and reused. Such ions can inhibit root absorption of essential nutrients. The objective of this work was to quantify the influence of NaCl concentration on the uptake of nitrate and potassium by roses and develop a predictive model of uptake inhibition based on NaCl, NO 3 − , and K + concentration. Oneyear-old rose plants (Rosa spp. 'Kardinal' on 'Natal Briar' rootstock) were moved into growth chambers where nitrogen and potassium depletion were monitored during 6 days. Eight different initial NaCl treatments varying from zero to 65 mol m −3 were used and within these there were two initial NO 3 − and K + concentrations: high concentration (HC, 7.0 mol m −3 and 2.6 mol m −3 NO 3 − and K + respectively) or low concentration (LC, 3.5 mol m −3 and 1.3 mol m −3 NO 3 − and K + respectively). Plant NO 3 − uptake was negatively affected by NaCl concentration. NO 3 − maximum influx (I max ) declined from 5.1 µmol to 2.5 µmol per gram of plant dry weight per hour as NaCl concentration increased from zero to 65 mol m −3 . A modified Michaelis-Menten (M-M) equation taking into account inhibition by NaCl provided the best fit for NO 3 − uptake in response to varying NaCl concentration. K + uptake was unaffected by NaCl concentration. A M-M equation that did not include inhibition was suitable for describing K + uptake at varying NaCl concentration. The resulting empirical models could assist with decision making, such as: adjustment of NO 3 − fertilization based on NaCl concentration, necessity of water desalinization, or determination of the desired leaching fraction.

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A Model for the Regulation of K⁺ Influx, and Tissue Potassium Concentrations by Negative Feedback Effects upon Plasmalemma Influx

Abstract: [Cl-

Cited by 39 publications

References 26 publications

Effect of potassium (K) supply on the uptake of 137 Cs by spring wheat ( Triticum aestivum cv. Tonic): a lysimeter study

Effect of potassium (K) supply on the uptake of 137 Cs by spring wheat ( Triticum aestivum cv. Tonic): a lysimeter study

K+ transport in plants: Physiology and molecular biology

Effects of saline root environment (NaCl) on nitrate and potassium uptake kinetics for rose plants: a Michaelis–Menten modelling approach

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A Model for the Regulation of K+ Influx, and Tissue Potassium Concentrations by Negative Feedback Effects upon Plasmalemma Influx

Abstract: [Cl-

Cited by 39 publications

References 26 publications

Effect of potassium (K) supply on the uptake of 137 Cs by spring wheat ( Triticum aestivum cv. Tonic): a lysimeter study

Effect of potassium (K) supply on the uptake of 137 Cs by spring wheat ( Triticum aestivum cv. Tonic): a lysimeter study

K+ transport in plants: Physiology and molecular biology

Effects of saline root environment (NaCl) on nitrate and potassium uptake kinetics for rose plants: a Michaelis–Menten modelling approach

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A Model for the Regulation of K⁺ Influx, and Tissue Potassium Concentrations by Negative Feedback Effects upon Plasmalemma Influx