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Root nitrate uptake in sugarcane (Saccharum spp.) is modulated by transcriptional and presumably posttranscriptional regulation of the NRT2.1/NRT3.1 transport system

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Nitrate uptake in sugarcane roots is regulated at the transcriptional and posttranscriptional levels based on the physiological status of the plant and is likely a determinant mechanism for discrimination against nitrate.

Abstract

Sugarcane (Saccharum spp.) is one of the most suitable energy crops for biofuel feedstock, but the reduced recovery of nitrogen (N) fertilizer by sugarcane roots increases the crop carbon footprint. The low nitrogen use efficiency (NUE) of sugarcane has been associated with the significantly low nitrate uptake, which limits the utilization of the large amount of nitrate available in agricultural soils. To understand the regulation of nitrate uptake in sugarcane roots, we identified the major canonical nitrate transporter genes (NRTsNITRATE TRANSPORTERS) and then determined their expression profiles in roots under contrasting N conditions. Correlation of gene expression with 15N-nitrate uptake revealed that under N deprivation or inorganic N (ammonium or nitrate) supply in N-sufficient roots, the regulation of ScNRT2.1 and ScNRT3.1 expression is the predominant mechanism for the modulation of the activity of the nitrate high-affinity transport system. Conversely, in N-deficient roots, the induction of ScNRT2.1 and ScNRT3.1 transcription is not correlated with the marked repression of nitrate uptake in response to nitrate resupply or high N provision, which suggested the existence of a posttranscriptional regulatory mechanism. Our findings suggested that high-affinity nitrate uptake is regulated at the transcriptional and presumably at the posttranscriptional levels based on the physiological N status and that the regulation of NRT2.1 and NRT3.1 activity is likely a determinant mechanism for the discrimination against nitrate uptake observed in sugarcane roots, which contributes to the low NUE in this crop species.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported by grants from the ‘Fundação de Amparo à Pesquisa do Estado de São Paulo—FAPESP (2013/15989-8) and the ‘Conselho Nacional de Desenvolvimento Científico e Tecnológico’ (CNPq 474242-2010-2). LHDS and JEL were supported by fellowships from FAPESP (2013/02702-2 and 2010/11313-1, respectively). DRP, RVS and AF are recipients of fellowships from CNPq.

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AF and JEL designed and supervised the research project. JEL, LHDS, MKA, ALT, and MV performed the experiments. JEL and LHDS analyzed and interpreted the data. DRP and RVS performed the bioinformatic analysis. AF, JEL, and SC contributed reagents/materials/analysis tools. JEL, LHDS, and AF wrote the manuscript.

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Correspondence to Antonio Figueira.

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The authors have no relevant financial or non-financial interests to disclose.

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Communicated by Bing Yang.

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Lima, J.E., Serezino, L.H.D., Alves, M.K. et al. Root nitrate uptake in sugarcane (Saccharum spp.) is modulated by transcriptional and presumably posttranscriptional regulation of the NRT2.1/NRT3.1 transport system. Mol Genet Genomics 297, 1403–1421 (2022). https://doi.org/10.1007/s00438-022-01929-8

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  • DOI: https://doi.org/10.1007/s00438-022-01929-8

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