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Poster

Session: Session 2 Presenting Authors at Posters (Odds)

P-413 - How Enterobacter sp. SA187 Improves Plant Growth Under Low Nitrogen: Decoding Synergy between SA187, Ethylene Signaling and Nitrate Transporters

Wednesday, July 16, 2025
13:30 - 15:15  
Location: Confex Hall 3
Plant Regulation of biotic and abiotic stress – trade-offs

    Presenting Author(s)

  • AI

    Amina Ilyas

    PhD student
    Institut des Sciences des Plantes de Paris-Saclay (IPS2)
    GIF SUR YVETTE, Ile-de-France, France

    • Author(s)

  • CM

    Caroline Mauve

    Institute of Plant Sciences Paris-Saclay (IPS2)
    Gif-sur-Yvette, Ile-de-France, France

  • MH

    Michael Hodges

    Institute of Plant Sciences Paris-Saclay (IPS2)
    GIF SUR YVETTE, Ile-de-France, France

  • Ad

    Axel de Zelicourt

    Institute of Plant Sciences Paris-Saclay (IPS2)
    GIF SUR YVETTE, Ile-de-France, France

Nitrogen (N) is an essential macronutrient for plant growth and development, yet its availability often limits agricultural productivity. The excessive use of synthetic nitrogen fertilizers has resulted in significant environmental problems, highlighting the urgent need for sustainable alternatives. Beneficial plant-associated microbes present a promising solution to enhance nutrient use efficiency and promote plant growth under nitrogen-limited conditions.

In this study, we explore how Enterobacter sp. SA187 (SA187), a bacterium known for promoting abiotic stress tolerance, supports the growth of Arabidopsis under low N conditions. Through physiological and molecular analyses, we demonstrate that SA187 enhances plant biomass and improves N uptake and assimilation in N-deficient environments. Our results show that SA187 regulates the expression of key high-affinity nitrate transporter genes, NRT2.5 and NRT2.6. Notably, NRT2.5 is regulated downstream of ethylene signaling pathways activated by SA187, whereas NRT2.6 is regulated independently of ethylene. Mutant analyses confirm the distinct roles of these pathways in mediating the growth-promoting effects of SA187.

These findings highlight the potential of SA187 as a microbial solution for improving plant growth under limited N conditions. Leveraging such beneficial microbes could reduce the dependence on synthetic N fertilizers, paving the way for environmentally sustainable strategies to enhance agricultural productivity.