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l-DOPA Impacts Nitrate and Ammonium Uptake and Their Assimilation into Amino Acids by Soybean (Glycine max L.) Plants

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Abstract

l-3,4-Dihydroxyphenylalanine (l-DOPA) is a non-protein amino acid with many biological roles, and it accumulates in species of the Fabaceae family. Our earlier work showed that l-DOPA reduces photosynthesis in soybean plants by inducing stomatal closure and limiting carbon metabolism. Because the photosynthetic assimilation of carbon is closely associated with nitrogen metabolism, we evaluated the effects of l-DOPA on nitrate and ammonium uptake and their assimilation into amino acids in soybean plants. l-DOPA inhibited nitrate and ammonium uptake by the roots and the conversion of nitrate to ammonium in the roots and leaves by nitrate and nitrite reductases. Ammonium incorporation into glutamate and glutamine by the action of the glutamine synthetase/glutamate synthase cycle was also reduced in both organs. In contrast, there was an evident accumulation of free amino acids in the roots and leaves, probably caused by the increased degradation of proteins. Taken together, our data revealed that l-DOPA affects the ability of soybean plants to uptake and assimilate inorganic nitrogen into amino acids.

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Acknowledgements

Rogério Marchiosi, Wanderley Dantas dos Santos, and Osvaldo Ferrarese-Filho are research fellows of the National Council for Scientific and Technological Development (CNPq).

Funding

This study was partially financed by the Coordination of Enhancement of Higher Education Personal—Brazil (CAPES)—Finance Code 001, Tiara da Silva Coelho-Bortolo.

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RM and OFF conceptualized the study. TSCB designed the experiments and analyzed the data with contributions from all the authors. TSCB, RM, and OFF co-wrote the manuscript.

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Correspondence to Rogério Marchiosi.

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The authors declare that they have no conflicts of interest.

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The manuscript has been approved for publication by all authors. All the authors listed have approved the manuscript enclosed herewith.

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Coelho-Bortolo, T.S., Marchiosi, R., Ferro, A.P. et al. l-DOPA Impacts Nitrate and Ammonium Uptake and Their Assimilation into Amino Acids by Soybean (Glycine max L.) Plants. J Plant Growth Regul 42, 4870–4884 (2023). https://doi.org/10.1007/s00344-022-10810-2

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  • DOI: https://doi.org/10.1007/s00344-022-10810-2

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