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<p>This study evaluates the multifaceted plant growth-promoting (PGP) capabilities of&#xa0;two distinct&#xa0;<i>Ensifer meliloti</i>&#xa0;strains: RM (MTCC 10499), isolated from the chickpea rhizosphere, and SINO (MTCC 11403), isolated from soybean nodules. Our selection of these strains is novel, driven by a notable gap in published research characterizing their PGP, quorum sensing (QS)-related, and biofilm-forming activities on&#xa0;<i>Cicer arietinum</i>. This study furthermore offers a unique comparative assessment of a native chickpea isolate against a soybean isolate for enhancing chickpea growth. While&#xa0;<i>Ensifer meliloti</i>&#xa0;is recognized for its traditional role in nitrogen fixation,&#xa0;the broader PGP traits of these particular strains, especially those potentially regulated by quorum sensing (QS), remain underexplored.&#xa0;We evaluated RM and SINO for key PGP traits including phosphate solubilization, siderophore production, ammonia and hydrogen cyanide synthesis, Indole-3-acetic acid (IAA) production, and biofilm formation. Both strains showed multiple beneficial attributes: RM exhibited significantly higher IAA production (57.8&#xa0;µg/mL), while SINO displayed enhanced phosphate solubilization and siderophore activity. Pot studies further confirmed Condense to their efficacy, with both strains significantly improving chickpea growth parameters, including root length (up to 1.5-fold increase), shoot length (1.2–1.5-fold increase), and chlorophyll content (1.5–2-fold increase) compared to untreated controls. These findings highlight the novel potential of RM and SINO as distinct, multi-trait&#xa0;<i>Ensifer meliloti</i>&#xa0;bioinoculants, underscoring the value of assessing diverse, QS-related traits from strains with varied origins for developing next-generation solutions in sustainable chickpea production.</p>

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Ensifer meliloti strains: as multi-trait bioinoculants enhancing Cicer arietinum growth and sustainability

  • 期刊论文

  • 发表日期：

    2026年3月8日

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  • Shivangi Bhatt,
  • Jasleen Kaur,
  • Dweipayan Goswami,
  • Meenu Saraf

摘要

This study evaluates the multifaceted plant growth-promoting (PGP) capabilities of two distinct Ensifer meliloti strains: RM (MTCC 10499), isolated from the chickpea rhizosphere, and SINO (MTCC 11403), isolated from soybean nodules. Our selection of these strains is novel, driven by a notable gap in published research characterizing their PGP, quorum sensing (QS)-related, and biofilm-forming activities on Cicer arietinum. This study furthermore offers a unique comparative assessment of a native chickpea isolate against a soybean isolate for enhancing chickpea growth. While Ensifer meliloti is recognized for its traditional role in nitrogen fixation, the broader PGP traits of these particular strains, especially those potentially regulated by quorum sensing (QS), remain underexplored. We evaluated RM and SINO for key PGP traits including phosphate solubilization, siderophore production, ammonia and hydrogen cyanide synthesis, Indole-3-acetic acid (IAA) production, and biofilm formation. Both strains showed multiple beneficial attributes: RM exhibited significantly higher IAA production (57.8 µg/mL), while SINO displayed enhanced phosphate solubilization and siderophore activity. Pot studies further confirmed Condense to their efficacy, with both strains significantly improving chickpea growth parameters, including root length (up to 1.5-fold increase), shoot length (1.2–1.5-fold increase), and chlorophyll content (1.5–2-fold increase) compared to untreated controls. These findings highlight the novel potential of RM and SINO as distinct, multi-trait Ensifer meliloti bioinoculants, underscoring the value of assessing diverse, QS-related traits from strains with varied origins for developing next-generation solutions in sustainable chickpea production.