Abstract
Background and aims
Legumes can obtain nitrogen from mineral nitrogen and symbiotic nitrogen; however, the regulatory mechanisms by which legume plants respond to various nitrogen sources are still unclear.
Methods
Here, the flavonoid metabolism profiles of Robinia pseudoacacia (black locust) in response to different nitrogen sources during the early growth stages were performed using the hydroponics method.
Results
The flavonoids were accumulated specifically responding to different nitrogen sources (symbiotic nitrogen and NO3−) in the roots and root exudates of R. pseudoacacia and showed growth-stage-dependent changes in the plant growth process. More flavonoids were synthesized and secreted under nitrogen deficiency. The differential flavonoids among different treatments were significantly enriched in the flavone and flavonol biosynthesis pathway and isoflavonoid biosynthesis pathway. Liquiritigenin, naringenin, apigenin and kaempferol were not only the metabolic nodes of these two metabolic pathways but also the key nodes in the differential flavonoid network. Therefore, these four flavonoids may be the key flavonoids of R. pseudoacacia responding to different nitrogen sources.
Conclusion
Our findings provide an important insight into the adaptability of legumes to different nitrogen environments and are of great significance for understanding the molecular mechanisms underlying nitrogen utilization in legumes and will contribute to the development of sustainable agricultural practices and crop production.
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Data availability
Data will be made available on request.
Abbreviations
- NF:
-
Nitrogen free
- SN:
-
Symbiotic nitrogen
- MN:
-
Mineral nitrogen
- dpt:
-
days post-treatment
- UPLC-MS/MS:
-
Ultra performance liquid chromatography tandem mass spectrometry
- PCA:
-
Principal component analysis
- HCA:
-
Hierarchical clustering analysis
- OPLS-DA:
-
Orthogonal partial least squares discriminant analysis
- FC:
-
Fold change
- VIP:
-
Variable importance for the projection
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- Chl:
-
Leaf chlorophyll content
- SL:
-
Shoot length
- SDW:
-
Shoo
t dry weight
- RL:
-
Root length
- RDW:
-
Root dry weight
- RN:
-
Root nitrogen content
- ShN:
-
Shoot nitrogen content
- SD:
-
Standard deviation
- ANOVA:
-
One-way analysis of variance
- DFs:
-
Differential flavonoids
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Acknowledgements
This work was supported by Key Research & Development program of Shaanxi Province (No. 2020ZDLNY07-09), and National Natural Science Foundation of China (No. 41977052).
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Li, Y., Shen, Y., Shi, R. et al. The synthesis and secretion of key substances in the flavonoid metabolic pathway responding to different nitrogen sources during early growth stages in Robinia pseudoacacia. Plant Soil 494, 373–393 (2024). https://doi.org/10.1007/s11104-023-06286-y
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DOI: https://doi.org/10.1007/s11104-023-06286-y