Transporters Involved in Root Nitrate Uptake and Sensing by Arabidopsis

Noguero, Mélanie; Lacombe, Benoı̂t

doi:10.3389/fpls.2016.01391

Cited by 67 publications

(48 citation statements)

References 79 publications

(115 reference statements)

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“…Nitrate is the major source of N for plants and, once taken up by the roots, is distributed within plants by a large number of nitrate transporters. Besides being a nutrient, nitrate itself acts as a signal regulating directly the expression of hundreds of genes (reviewed in Noguero & Lacombe, ). These genes encode proteins required for nitrate transport and assimilation, and the reprogramming of carbon (C) and N metabolism, as well as transcription factors and regulatory proteins, triggering a cascade of changes that support increased growth.…”

Section: Introductionmentioning

confidence: 99%

Nitrate acts at the Arabidopsis thaliana shoot apical meristem to regulate flowering time

et al. 2019

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Summary Optimal timing of flowering, a major determinant for crop productivity, is controlled by environmental and endogenous cues. Nutrients are known to modify flowering time; however, our understanding of how nutrients interact with the known pathways, especially at the shoot apical meristem ( SAM ), is still incomplete. Given the negative side‐effects of nitrogen fertilization, it is essential to understand its mode of action for sustainable crop production. We investigated how a moderate restriction by nitrate is integrated into the flowering network at the SAM , to which plants can adapt without stress symptoms. This condition delays flowering by decreasing expression of SUPRESSOR OF OVEREXPRESSION OF CONSTANS 1 ( SOC 1 ) at the SAM . Measurements of nitrate and the responses of nitrate‐responsive genes suggest that nitrate functions as a signal at the SAM . The transcription factors NIN ‐ LIKE PROTEIN 7 ( NLP 7) and NLP 6, which act as master regulators of nitrate signaling by binding to nitrate‐responsive elements ( NRE s), are expressed at the SAM and flowering is delayed in single and double mutants. Two upstream regulators of SOC 1 ( SQUAMOSA PROMOTER BINDING PROTEIN ‐ LIKE 3 ( SPL 3 ) and SPL 5 ) contain functional NRE s in their promoters. Our results point at a tissue‐specific, nitrate‐mediated flowering time control in Arabidopsis thaliana .

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Section: Introductionmentioning

confidence: 99%

Nitrate acts at the Arabidopsis thaliana shoot apical meristem to regulate flowering time

et al. 2019

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“…[28][29][30][31] The coupling of transport to sensing allows the cell to have an accurate perception of the amount of nitrate it is acquiring; once nitrate enters the cytoplasm, it can either be moved to the vacuole, exported from the cell or rapidly converted to other forms of inorganic nitrogen and subsequently assimilated, making accurate assessment of nitrate pools in the cytoplasm problematic. 20,32 The strongest case can be made for AtNPF6.3 being a transceptor, with a nitrate sensing role that can be uncoupled from transport. 30 Nitrate activation of ABA signaling by release of bioactive ABA from inactive stores Once nitrate is increased in the environment of the root, it triggers the gradual accumulation of ABA in the root tip, stimulating ABA signaling, and ultimately regulating first nitrate metabolism, then uptake ( Fig.…”

Section: Nitrate and Aba In Root Developmentmentioning

confidence: 99%

Environmental nitrate signals through abscisic acid in the root tip

Harris

Ondzighi‐Assoume

2017

Plant Signaling & Behavior

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Roots respond to changes in environmental nitrate with a localized stimulation of ABA levels in the root tip. This rise in ABA levels is due to the action of ER-localized b-GLUCOSIDASE 1, which releases bioactive ABA from the inactive ABA-glucose ester. The slow rise in root tip ABA levels stimulates expression of nitrate metabolic enzymes and simultaneously activates a negative feedback loop involving the protein phosphatase, ABI2, which reduces nitrate influx via the AtNPF6.3 transceptor. The rise in root-tip localized ABA also negatively regulates expression of the SCARECROW transcription factor, thus providing a sensitive mechanism for modulating root growth in response to environmental changes.

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“…Interestingly, nutrient elements serve as signaling molecules that integrates and coordinates gene expressions, triggers chemical switches and in turn stabilize plant metabolism and growth (Liu et al, 2017). Primarily these responses also activate highly sophisticated transport system that facilitate nutrients sensing, uptake and remobilization (Noguero and Lacombe, 2016). Nonetheless, plant hormones play central role during these events and interacts with nutrient signaling at multiple levels (Rubio et al, 2009).…”

Section: Mirnas and Hormonal Coordinated Regulation Of Nutrient Homeomentioning

confidence: 99%

Dynamic roles of microRNAs in nutrient acquisition and plant adaptation under nutrient stress: A review

Shahzad¹,

Harlina²,

Ayaad³

et al. 2018

Plant Omics

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A constant supply of soil nutrients is critical for the normal growth and development of plants. However, most environments are unstable and this variability depends on numerous factors that include availability of water content, pH, redox potential, an abundance of organic matter as well as microorganisms in soils. To overcome these hurdles and to maintain nutritional homeostasis, plants have evolved sophisticated systems for the continuous provision of soil nutrients necessary for their uninterrupted growth. In this pressing scenario, plant microRNAs (miRNAs) have emerged as a central regulator of nutrients uptake and transport during limited nutrient conditions. Numerous studies establish the intrinsic involvement of miRNAs and their immediate targets facilitating the core mechanisms related to nutrient homeostasis. In this review, we focus on global overview of miRNAs and their dynamic roles involved in keeping nutritional balance within the plants mediated via post-transcriptional regulation by transcript cleavage or translational inhibition of their target mRNAs. In addition, we have also focused on some of the forefront plant adaptations mediated by miRNAs during nutrient deficiency, such as root architecture modifications, transport channel modulation, long distance signaling and subsequent nutrient mobilization through phloem. Moreover, plant strategy to bring out such alterations is a highly perplexing mechanism that requires changes at large scale which involves coordinated regulation of miRNAs and plant hormones at multiple levels. Deciphering the underlying miRNAs-based mechanisms for streamlining nutrient uptake and transport would be a giant step towards solving this conundrum.

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Transporters Involved in Root Nitrate Uptake and Sensing by Arabidopsis

Cited by 67 publications

References 79 publications

Nitrate acts at the Arabidopsis thaliana shoot apical meristem to regulate flowering time

Nitrate acts at the Arabidopsis thaliana shoot apical meristem to regulate flowering time

Environmental nitrate signals through abscisic acid in the root tip

Dynamic roles of microRNAs in nutrient acquisition and plant adaptation under nutrient stress: A review

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