The Mineral Nutrition of Higher Plants

Clarkson, David T.; Hanson, James A.

doi:10.1146/annurev.pp.31.060180.001323

Cited by 1,013 publications

(544 citation statements)

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“…K + also contributes to the regulation of crop yield and quality in agricultural production (Clarkson and Hanson, 1980;Zörb et al, 2014). As the most abundant cation in plants, K + in plants is an important source of K + intake for animals.…”

Section: Introductionmentioning

confidence: 99%

NRT1.5/NPF7.3 Functions as a Proton-Coupled H⁺/K⁺ Antiporter for K⁺ Loading into the Xylem in Arabidopsis

et al. 2017

Plant Cell

157

162

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Section: Introductionmentioning

confidence: 99%

NRT1.5/NPF7.3 Functions as a Proton-Coupled H⁺/K⁺ Antiporter for K⁺ Loading into the Xylem in Arabidopsis

et al. 2017

Plant Cell

157

162

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“…Potassium is an essential mineral element for plant growth and development, and it plays essential roles in many important physiological and biochemical processes in living plant cells, such as regulation of enzyme activation, electrical neutralization, osmoregulation, control of membrane potential, co-transport of sugars, and so on [1,2]. Plant growth and development need millimolar K + in the soil or growth medium, but typical K + concentration at the interface of roots and soils is within micromolar range [3].…”

Section: Introductionmentioning

confidence: 99%

Potassium channel α-subunit AtKC1 negatively regulates AKT1-mediated K+ uptake in Arabidopsis roots under low-K+ stress

Wang

et al. 2010

Cell Res

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Potassium transporters play crucial roles in K + uptake and translocation in plants. However, so far little is known about the regulatory mechanism of potassium transporters. Here, we show that a Shaker-like potassium channel AtKC1, encoded by the AtLKT1 gene cloned from the Arabidopsis thaliana low-K + (LK)-tolerant mutant Atlkt1, significantly regulates AKT1-mediated K + uptake under LK conditions. Under LK conditions, the Atkc1 mutants maintained their root growth, whereas wild-type plants stopped their root growth. Lesion of AtKC1 significantly enhanced the tolerance of the Atkc1 mutants to LK stress and markedly increased K + uptake and K + accumulation in the Atkc1-mutant roots under LK conditions. Electrophysiological results showed that AtKC1 inhibited the AKT1-mediated inward K + currents and negatively shifted the voltage dependence of AKT1 channels. These results demonstrate that the 'silent' K + channel α-subunit AtKC1 negatively regulates the AKT1-mediated K + uptake in Arabidopsis roots and consequently alters the ratio of root-to-shoot under LK stress conditions. Keywords: Arabidopsis; potassium channel; low-K + stress; AKT1; AtKC1 Cell Research (2010) IntroductionPotassium is an essential mineral element for plant growth and development, and it plays essential roles in many important physiological and biochemical processes in living plant cells, such as regulation of enzyme activation, electrical neutralization, osmoregulation, control of membrane potential, co-transport of sugars, and so on [1,2]. Plant growth and development need millimolar K + in the soil or growth medium, but typical K + concentration at the interface of roots and soils is within micromolar range [3]. Thus, plants often encounter low-K + (LK) stress under natural conditions. Although different plants or different genotypes of a plant species show varied K + utilization efficiency [4], most plants show K + -deficient symptom under LK stress, typically leaf chlorosis and subsequent inhibition of plant growth and development [5].Absorption of K + by plant cells and K + translocation between different tissues and organs in plants are mediated by plant K + transporters and channels [2,6,7]. Over the past decade, a large number of genes encoding plant K + transporters and channels, particularly for Arabidopsis, have been characterized [6][7][8]. These K + transporters vary in K + affinity, kinetics, transcriptional modulation, regulatory mechanism, etc [2,[6][7][8], and they compose a complex system for plant K + uptake and translocation. Among these K + transporters and channels, members of the Shaker K + channel family are well characterized for their potential functions and are probably the most important for K + uptake and transport in Arabidopsis [8] Recent reports showed that channel heterotetramerization is a key regulatory mechanism for K + channels, which was found not only in animals [14][15][16] but also in plants [17,18]. Different kinds of potassium channel subunits may assemble together to form functional heteromer...

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“…Although N, P and K frequently limits growth and development of several crop species under field conditions, the precise mechanisms by the limitation occurs are complex and variable depending on species, developmental stage and environment. Limited N, P and K supply decreases rates of cell division, cell expansion and cell permeability (Roggatz et al, 1999), photosynthesis, leaf production, and growth, plants (Chapin, 1980;Clarkson and Hanson, 1980;Evans, 1983;Radin and Boyer, 1982;Sinclair and Horie, 1989;Reddy et al, 1997a;Gerik et al, 1998;Zhao et al, 2003Zhao et al, , 2005a and yield (Zhao et al, 2007). Some reports suggest that N deficiency affects more strongly the leaf development than photosynthesis (Watson, 1952;Wong, 1979;Radin and Boyer, 1982;Reddy et al, 1997a).…”

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confidence: 99%

Effects of Nitrogen, Phosphorus and Potassium Levels on Kenaf (Hibiscus cannabinus L.) Growth and Photosynthesis under Nutrient Solution

Hossain¹,

Musa²,

Talib³

et al. 2010

JAS

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To date, little is known about the effect of levels of nitrogen, phosphorus and potassium on kenaf grown in nutrient solution culture. The objective of the present study was to examine the effects of different nitrogen, phosphorus and potassium levels on kenaf growth such as diameter, plant height, leaf number, root dry weight, stem dry weight and leaf dry weight and physiology like chlorophyll content, photosynthesis and stomatal conductance. Treatment consisted of 5 different levels of nitrogen viz. 0, 50, 100, 200 and 400 mg/L and 5 different levels of phosphorus and potassium viz. 0, 25, 50, 100 and 200 mg/L replicated thrice in a completely randomized design in a shade house. Growth (diameter, plant height and leaf number), chlorophyll content and photosynthesis were measured once weekly and plant components biomass was measured, 28 DAT. Different levels of nitrogen, phosphorus and potassium had significant effects on all the parameters studied. The highest values for diameter, plant height, leaf number, root dry weight, stem dry weight, leaf dry weight, photosynthesis and stomatal conductance were obtained from 200N, 100P and 100K whereas values decreased with further increase in levels of nutrient concentration. All the growth rates, chlorophyll content and photosynthesis declined with lower level of nitrogen, phosphorus and potassium. Among the plant components, leaf dry weight had the greatest decrease while root/shoot ratio increased under N deficiency. The results of this study provide new knowledge to produce kenaf with better nutrient management in the field.

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The Mineral Nutrition of Higher Plants

Cited by 1,013 publications

References 174 publications

NRT1.5/NPF7.3 Functions as a Proton-Coupled H⁺/K⁺ Antiporter for K⁺ Loading into the Xylem in Arabidopsis

NRT1.5/NPF7.3 Functions as a Proton-Coupled H⁺/K⁺ Antiporter for K⁺ Loading into the Xylem in Arabidopsis

Potassium channel α-subunit AtKC1 negatively regulates AKT1-mediated K+ uptake in Arabidopsis roots under low-K+ stress

Effects of Nitrogen, Phosphorus and Potassium Levels on Kenaf (Hibiscus cannabinus L.) Growth and Photosynthesis under Nutrient Solution

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The Mineral Nutrition of Higher Plants

Cited by 1,013 publications

References 174 publications

NRT1.5/NPF7.3 Functions as a Proton-Coupled H+/K+ Antiporter for K+ Loading into the Xylem in Arabidopsis

NRT1.5/NPF7.3 Functions as a Proton-Coupled H+/K+ Antiporter for K+ Loading into the Xylem in Arabidopsis

Potassium channel α-subunit AtKC1 negatively regulates AKT1-mediated K+ uptake in Arabidopsis roots under low-K+ stress

Effects of Nitrogen, Phosphorus and Potassium Levels on Kenaf (Hibiscus cannabinus L.) Growth and Photosynthesis under Nutrient Solution

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NRT1.5/NPF7.3 Functions as a Proton-Coupled H⁺/K⁺ Antiporter for K⁺ Loading into the Xylem in Arabidopsis

NRT1.5/NPF7.3 Functions as a Proton-Coupled H⁺/K⁺ Antiporter for K⁺ Loading into the Xylem in Arabidopsis