Browsing by Author "Sahoo, Rudra Narayan"

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    Engineered diazotrophs with host-inducible nitrogen supply systems: Transforming rice farming through innovative nitrogen biofertilizers
    (John Wiley & Sons, 2026) Sengupta, Ahana; Sahoo, Rudra Narayan; Sinharoy, Senjuti
    Nitrogen pollution represents a critical challenge in the 21st century, highlighting the urgent need for sustainable alternatives to industrial nitrogen fixation. Diazotrophic bacteria, which uniquely convert dinitrogen (N2) into bioavailable forms, offer a promising solution through biological nitrogen fixation (BNF). These bacteria typically perform nitrogen fixation under nitrogen-limited conditions. Over the past 50 years, extensive research has elucidated the molecular mechanisms and regulatory pathways governing BNF. Recent microbiome studies have revealed that wild rice accessions harbor a greater abundance of diazotrophic bacteria, whereas a substantial proportion of these beneficial microbes have been lost in modern cultivated varieties. Advancements in synthetic biology have enabled the engineering of nitrogen‑exporting diazotrophs, potentially reducing dependence on industrial nitrogen fertilizers. This review emphasizes the importance of targeted research to develop customized diazotrophic microbes in conjunction with synthetic microbial community that can serve as nitrogen exporters for rice. Furthermore, it highlights the necessity of identifying rice cultivars that are particularly responsive to these microbial interventions. Finally, it provides a comprehensive roadmap addressing key challenges and opportunities in deploying BNF to supplement plant nitrogen nutrition and advance sustainable agriculture.
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    Organized peripheral vascular strand development in nodules is controlled by a bHLH/HLH heterodimer
    (John Wiley & Sons, 2026) Srivastava, Deevita; Bhadu, Vikash; Sahoo, Rudra Narayan; Ghosh, Asim Kumar; Upadhyay, Priya; Bhardwaj, Akanksha; Udvardi, Michael K; Ranjan, Aashish; Sinharoy, Senjuti
    The Leguminosae family can develop root nodules with symmetrical peripheral vascular-strands (PVSs). Medicago truncatula forms indeterminate nodules with PVSs. The PVSs elongate directly from the root toward the nodule apex, maintaining a symmetrical organization and facilitating the formation of the cylindrical nodule structure. By combining genetic, biochemical, and genomic tools, we have shown that two basic Helix-Loop-Helix groups of transcription factors, MtbHLH1 (renamed Nodule Vascular bundle Development 1 (NVD1)) and NVD2, control the development of symmetrical PVSs in M. truncatula. In nvd1 nodules, PVSs drift toward the infection zone, generating aberrantly shaped nodules. NVD1 activates its expression along with NVD2, a transcriptional regulator. NVD1 functions downstream of auxin signaling. Transcriptome sequencing of nvd1 and nvd2 nodules, combined with visualization of auxin and cytokinin (CK) signal outputs, revealed disrupted auxin and CK signaling in nvd nodules. Furthermore, ectopic expression of the auxin biosynthetic enzyme (MtYUCCA8) under pMtNVD1 and pMtNVD2 resulted in defective PVSs. Mutant nvd2 nodules display asymmetric PVSs. NVD2 regulates the transcriptional activity of NVD1 by forming heterodimers with it. The formation of symmetrical PVSs depends on the balanced presence of NVD1 and NVD2. Our findings highlight the pivotal role of the NVD1-NVD2 interaction in shaping the development of symmetrical PVSs.