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Elevated CO2 alters tissue balance of nitrogen metabolism and downregulates nitrogen assimilation and signalling gene expression in wheat seedlings receiving high nitrate supply

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Abstract

Tissue and canopy-level evidence suggests that elevated carbon dioxide (EC) inhibits shoot nitrate assimilation in plants and thereby affects nitrogen (N) and protein content of the economic produce. It is speculated that species or genotypes relying more on root nitrate assimilation can adapt better under EC due to the improved/steady supply of reductants required for nitrate assimilation. A study was conducted to examine the effect of EC on N assimilation and associated gene expression in wheat seedlings. Wheat genotypes, BT-Schomburgk (BTS) with comparatively high leaf nitrate reductase (NR) activity and Gluyas Early (GE) with high root NR activity were grown in hydroponic culture for 30 days with two different nitrate levels (0.05 mM and 5 mM) in the climate controlled growth chambers maintained at either ambient (400 ± 10 μmol mol−1) or EC (700 ± 10 μmol mol−1) conditions. Exposure to EC downregulated the activity of enzyme NR and glutamate synthase (GOGAT) in leaf tissues, whereas in roots, activities of both the enzymes were upregulated by exposure to EC. In addition, EC downregulated N assimilation and signalling gene expression under high N availability. Root N assimilation was less affected in comparison with shoot N assimilation; thereby, the proportion of root contribution towards total assimilation was higher. The results suggest that EC could alter and re-programme N assimilation and signalling in wheat seedlings. The genotype and tissue-specific effects of EC on N assimilation also warrants the need for identification of suitable genotypes and revision of fertiliser regime for tapping the beneficial effects of EC conditions.

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Acknowledgements

The authors are thankful to the ICAR-Indian Agricultural Research Institute for providing the necessary facilities.

Funding

This work was financially supported by the ICAR-Indian Agricultural Research Institute for funding (institute project-CRSCIARISIL20144047279). SAB was a recipient of ICAR-Junior research fellowship support, during the course of the study.

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SAB and LS conducted the experiments. LS finalised the experiments, designed primers and did the expression profiling and statistical analysis. LS and SAB together prepared the manuscript.

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Correspondence to Lekshmy Sathee.

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Adavi, S.B., Sathee, L. Elevated CO2 alters tissue balance of nitrogen metabolism and downregulates nitrogen assimilation and signalling gene expression in wheat seedlings receiving high nitrate supply. Protoplasma 258, 219–233 (2021). https://doi.org/10.1007/s00709-020-01564-3

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