Nitrate Transporters and Root Architecture

Chapman, Nick; Miller, Tony

doi:10.1007/978-3-642-14369-4_6

Cited by 9 publications

(19 citation statements)

References 106 publications

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“…Recently, Krouk et al have shown that a dual‐affinity transporter, namely NTR1.1, facilitates uptake of auxin and that a high nitrate concentration inhibits NTR1.1‐dependent auxin uptake in outgrowing lateral roots. This could be expected to reduce the auxin flow in epidermal cells and accumulation of auxin in the tip of lateral roots (Krouk et al , Mounier et al 2013). It is well known that secondary transporters are energized by proton pumping ATPases (Palmgren ) and AHA2 might be involved in accumulation of auxin mediated by NRT1.1.…”

Section: Discussionmentioning

confidence: 99%

The plasma membrane H⁺‐ATPase AHA2 contributes to the root architecture in response to different nitrogen supply

Młodzińska

Kłobus

Christensen

et al. 2014

Physiologia Plantarum

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In this study the role of the plasma membrane (PM) H(+) -ATPase for growth and development of roots as response to nitrogen starvation is studied. It is known that root development differs dependent on the availability of different mineral nutrients. It includes processes such as initiation of lateral root primordia, root elongation and increase of the root biomass. However, the signal transduction mechanisms, which enable roots to sense changes in different mineral environments and match their growth and development patterns to actual conditions in the soil, are still unknown. Most recent comments have focused on one of the essential macroelements, namely nitrogen, and its role in the modification of the root architecture of Arabidopsis thaliana. As yet, not all elements of the signal transduction pathway leading to the perception of the nitrate stimulus, and hence to anatomical changes of the root, which allow for adaptation to variable ion concentrations in the soil, are known. Our data demonstrate that primary and lateral root length were shorter and lower in aha2 mutant lines compared with wild-type plants in response to a variable nitrogen source. This suggests that the PM proton pump AHA2 (Arabidopsis plasma membrane H(+) -ATPase isoform 2) is important for root growth and development during different nitrogen regimes. This is possible by controlling the pH homeostasis in the root during growth and development as shown by pH biosensors.

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Section: Discussionmentioning

confidence: 99%

The plasma membrane H⁺‐ATPase AHA2 contributes to the root architecture in response to different nitrogen supply

Młodzińska

Kłobus

Christensen

et al. 2014

Physiologia Plantarum

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“…This necessitates a mechanism to regulate cytosolic nitrate concentration, which is provided by a nitrate-inducible effl ux system that prevents excessive accumulation of nitrate in the cell ). An effl ux transporter, NAXT1, was recently identifi ed belonging to the NRT1/PTR family of transporters (Segonzac et al 2007 ;Chapman and Miller 2011 ).…”

Section: Nitrogen Excessmentioning

confidence: 99%

“…Both drought and heat stresses together affect N availability storage and remobilization in pine trees (Rennenberg et al 2009 ;Huang et al 2012 ). The activity of many nitrate-regulated genes is hypothesized to be regulated by light, and evidence shows that both NRT2 and NR activity is dependent on light as well as nitrogen (Lillo 2004(Lillo , 2008Chapman and Miller 2011 ). Thus, mounting evidence suggests that the effect of various abiotic stresses can lead to unanticipated changes in plant growth and development.…”

Section: N In Multiple Interacting Stressesmentioning

confidence: 99%

Elucidation of Abiotic Stress Signaling in Plants

2015

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The above image represents a depiction of activation of different signaling pathways by diverse stimuli that converge to activate intricate signaling and interaction networks to counter stress (top panel). Since environmental stresses infl uence most signifi cantly to the reduction in potential crop yield, progress is now largely anticipated through functional genomics studies in plants through the use of techniques such as large-scale analysis of gene expression pattern in response to stress and construction, analysis and use of plant protein interactome networks maps for effective engineering strategies to generate stress tolerant crops (top panel). The molecular aspects of these signaling pathways are extensively studied in model plant Arabidopsis thaliana and crop plant rice ( Oryza sativa ) (below).

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“…2007; Chapman & Miller 2011). The activity of NRT2 and nitrate uptake is positively regulated by light, because of a reduced repression of NRT2 by NRT1 (Chapman & Miller 2011), mediated by the transcription factors HY5 and HYH (Jonassen, Sevin & Lillo 2009). Increased NRT2‐mediated HATS activity levels and increased nitrate uptake rates occur at N‐limitation or by sucrose treatment, while feedback repression at the transcription/mRNA level of NRT2 and nitrate uptake rate occurs by N‐metabolites resulting from nitrate reduction (Lejay et al .…”

Section: Introductionmentioning

confidence: 99%

“…An efflux transporter, NAXT1, was recently identified belonging to the NRT1/PTR family of transporters (Segonzac et al . 2007; Chapman & Miller 2011).…”

Section: Introductionmentioning

confidence: 99%

Integrating fluctuating nitrate uptake and assimilation to robust homeostasis

Huang¹,

Drengstig

Ruoff³

2011

Plant Cell & Environment

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Nitrate is an important nitrogen source used by plants. Despite of the considerable variation in the amount of soil nitrate, plants keep cytosolic nitrate at a homeostatic controlled level. Here we describe a set of homeostatic controller motifs and their interaction that can maintain robust cytosolic nitrate homeostasis at fluctuating external nitrate concentrations and nitrate assimilation levels. The controller motifs are divided into two functional classes termed as inflow and outflow controllers. In the presence of high amounts of environmental nitrate, the function of outflow controllers is associated to efflux mechanisms removing excess of nitrate from the cytosol that is taken up by lowaffinity transporter systems (LATS). Inflow controllers on the other hand maintain homeostasis in the presence of a high demand of nitrate by the cell relative to the amount of available environmental nitrate. This is achieved by either remobilizing nitrate from a vacuolar store, or by taking up nitrate by means of high-affinity transporter systems (HATS). By combining inflow and outflow controllers we demonstrate how nitrate uptake, assimilation, storage and efflux are integrated to a regulatory network that maintains cytosolic nitrate homeostasis at changing environmental conditions.

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Nitrate Transporters and Root Architecture

Cited by 9 publications

References 106 publications

The plasma membrane H⁺‐ATPase AHA2 contributes to the root architecture in response to different nitrogen supply

The plasma membrane H⁺‐ATPase AHA2 contributes to the root architecture in response to different nitrogen supply

Elucidation of Abiotic Stress Signaling in Plants

Integrating fluctuating nitrate uptake and assimilation to robust homeostasis

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Nitrate Transporters and Root Architecture

Cited by 9 publications

References 106 publications

The plasma membrane H+‐ATPase AHA2 contributes to the root architecture in response to different nitrogen supply

The plasma membrane H+‐ATPase AHA2 contributes to the root architecture in response to different nitrogen supply

Elucidation of Abiotic Stress Signaling in Plants

Integrating fluctuating nitrate uptake and assimilation to robust homeostasis

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Resources

About

The plasma membrane H⁺‐ATPase AHA2 contributes to the root architecture in response to different nitrogen supply

The plasma membrane H⁺‐ATPase AHA2 contributes to the root architecture in response to different nitrogen supply