AI Article Synopsis
- Legumes manage root nodule symbiosis (RNS) based on the availability of nitrogen in their environment, with a focus on internal nitrogen status influencing physiological processes.
- The study particularly investigates how iron (Fe) accumulates in nodules and highlights the expression of IRON MAN (IMA) peptide genes during symbiotic nitrogen fixation in Lotus japonicus.
- It is revealed that IMA peptides are crucial for balancing nitrogen and iron levels, impacting nitrogen homeostasis in both L. japonicus and Arabidopsis thaliana, ultimately contributing to the regulation of nitrogen-related processes.
Article Abstract
Legumes control root nodule symbiosis (RNS) in response to environmental nitrogen availability. Despite the recent understanding of the molecular basis of external nitrate-mediated control of RNS, it remains mostly elusive how plants regulate physiological processes depending on internal nitrogen status. In addition, iron (Fe) acts as an essential element that enables symbiotic nitrogen fixation; however, the mechanism of Fe accumulation in nodules is poorly understood. Here, we focus on the transcriptome in response to internal nitrogen status during RNS in Lotus japonicus and identify that IRON MAN (IMA) peptide genes are expressed during symbiotic nitrogen fixation. We show that LjIMA1 and LjIMA2 expressed in the shoot and root play systemic and local roles in concentrating internal Fe to the nodule. Furthermore, IMA peptides have conserved roles in regulating nitrogen homeostasis by adjusting nitrogen-Fe balance in L. japonicus and Arabidopsis thaliana. These findings indicate that IMA-mediated Fe provision plays an essential role in regulating nitrogen-related physiological processes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10825120 | PMC |
| http://dx.doi.org/10.1038/s41467-024-44865-4 | DOI Listing |
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