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Insights into carbon and nitrogen metabolism and antioxidant potential during vegetative phase in quinoa (Chenopodium quinoa Willd.)

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Abstract

The present investigation was carried out to understand the impact of carbon and nitrogen metabolism in quinoa genotypes IC411824, IC411825, EC507747 and EC507742 during pre-anthesis stage. It was observed that activities of acid invertase, sucrose synthase (cleavage) and sucrose phosphate synthase (SPS) increased up to 75 days after sowing (DAS) and this might be responsible for providing reducing sugars for the development of vegetative parts. Enhanced activities of nitrate reductase, glutamate synthase, glutamine synthetase during vegetative growth of leaves and stem at 90 DAS assist the fixation of ammonia on glutamate molecule to synthesize amino acids at early stages. However, the glutamate dehydrogenase and nitrite reductase play a central role in the re-assimilation of amides from the amino group of asparaginase. As a result, these photosynthetic products will be responsible for providing both the energy and the C-skeletons for ammonium assimilation during amino acid biosynthesis. Leaves and stem of IC411824 and IC411825 had higher total phenol and total flavonoid content. DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity was found to be higher in leaves of IC411825 and in stem of IC411824 and IC411825 indicating their capability to act as natural antioxidants.

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SKG was involved in planning all the aspects of research, supervision, and editing of the manuscript. S performed the experiments, analysed the data, and wrote the manuscript. RKG contributed in the planning, raising of the crop in the field, and editing of the manuscript. All the authors read and approved the final manuscript.

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Correspondence to Satvir Kaur Grewal.

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The authors declare no competing interests.

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Sonali, Grewal, S.K. & Gill, R.K. Insights into carbon and nitrogen metabolism and antioxidant potential during vegetative phase in quinoa (Chenopodium quinoa Willd.). Protoplasma 259, 1301–1319 (2022). https://doi.org/10.1007/s00709-022-01736-3

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  • DOI: https://doi.org/10.1007/s00709-022-01736-3

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