![]() Our study demonstrated that carbon and nitrogen metabolism was altered in the roots of sugar beet plants under salt stress. Correlation analysis revealed that most genes were significantly related to only allantoin and xanthosine. In addition, multiomic analysis revealed that the expression of the gene encoding xanthine dehydrogenase (XDH) was upregulated and that the expression of the gene encoding allantoinase (ALN) was significantly downregulated, resulting in a large accumulation of allantoin. After 7 days of salt stress, nitrogen-containing metabolites such as AAs, betaine, melatonin, and (S)-2-aminobutyric acid increased significantly. After 1 day of stress, the content of sucrose decreased, whereas the content of organic acids (OAs) such as L-malic acid and 2-oxoglutaric acid increased. Furthermore, metabolomic analysis revealed that sucrose metabolism and the activity of the tricarboxylic acid (TCA) cycle increased in response to salt stress. Most of the genes were involved in carbon metabolism and amino acid (AA) biosynthesis. ![]() A total of 1279 and 903 DEGs were identified on days 1 and 7, respectively, and were mapped mainly to 10 Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways. The transcriptomic results showed that a large number of differentially expressed genes (DEGs) were enriched in various metabolic pathways. Interestingly, under salt stress, the increase in the Na +/K + ratio compared to the control ratio on day 7 was lower than that on day 1 in the roots. Salt stress caused reactive oxygen species (ROS) damage and ion toxicity in the roots. The ionome, metabolome, and transcriptome of the roots of sugar beet seedlings were evaluated after 1 day (short term) and 7 days (long term) of 300 mM Na + treatment. This study explored the alterations to the carbon and nitrogen metabolism mechanisms enabling the roots of sugar beet seedlings to adapt to salinity. is one of the main sugar-producing crop species and is highly adaptable to saline soil.
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