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<p>The agricultural sector is grappling with drought stress, which severely affects crop productivity<b>.</b> Plant growth-promoting bacteria (PGPB) offer a promising solution for enhancing crop growth in these drought-affected areas. This study investigates the plant growth-promoting attributes of <i>Burkholderia seminalis, Stenotrophomonas maltophilia</i>, and <i>Enterobacter</i> sp. (JJG_Zn) under different levels of polyethylene glycol (PEG 6000)-induced drought stress (0%, 5%, 10%, and 15%). All three PGPBs exhibited plant growth-promoting (PGP) traits, i.e., Indole-3-acetic acid (IAA) production, phosphate solubilization, siderophore production, ammonia production, and gibberellic acid production, even at 15% PEG 6000-induced drought stress. Furthermore, the beneficial effects of these PGPBs on enhancing drought stress tolerance in forage sorghum through bio-priming with the liquid bacterial inoculants (LBIs) were also studied under in vitro conditions. The dual inoculation of <i>B. seminalis</i> + <i>S. maltophilia</i> (T<sub>5</sub>) was found to markedly enhance the germination indices, viz. germination percentage, speed, mean germination time, shoot length, root length, fresh and dry shoot and root weight, and vigor index over the uninoculated seeds, across diverse drought stress levels. Moreover, scanning electron microscopy (SEM) analysis showed extensive root colonization by all three PGPBs. This study highlights the potential of bio-priming forage sorghum seeds with LBIs to mitigate the adverse effects of drought stress and promote seedling growth and development. These promising bacterial inoculants ought to mandate further evaluation in drought-affected areas across different agro-climatic zones and comprehensive biosafety analyses, in line with the 'one health' concept.</p>

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Unveiling the efficacy of liquid bacterial inoculants in alleviating drought stress in bio-primed forage Sorghum seeds: an in vitro investigation

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Jaspreet Kaur,
  • Gulab Pandove,
  • Anu Kalia

摘要

The agricultural sector is grappling with drought stress, which severely affects crop productivity. Plant growth-promoting bacteria (PGPB) offer a promising solution for enhancing crop growth in these drought-affected areas. This study investigates the plant growth-promoting attributes of Burkholderia seminalis, Stenotrophomonas maltophilia, and Enterobacter sp. (JJG_Zn) under different levels of polyethylene glycol (PEG 6000)-induced drought stress (0%, 5%, 10%, and 15%). All three PGPBs exhibited plant growth-promoting (PGP) traits, i.e., Indole-3-acetic acid (IAA) production, phosphate solubilization, siderophore production, ammonia production, and gibberellic acid production, even at 15% PEG 6000-induced drought stress. Furthermore, the beneficial effects of these PGPBs on enhancing drought stress tolerance in forage sorghum through bio-priming with the liquid bacterial inoculants (LBIs) were also studied under in vitro conditions. The dual inoculation of B. seminalis + S. maltophilia (T5) was found to markedly enhance the germination indices, viz. germination percentage, speed, mean germination time, shoot length, root length, fresh and dry shoot and root weight, and vigor index over the uninoculated seeds, across diverse drought stress levels. Moreover, scanning electron microscopy (SEM) analysis showed extensive root colonization by all three PGPBs. This study highlights the potential of bio-priming forage sorghum seeds with LBIs to mitigate the adverse effects of drought stress and promote seedling growth and development. These promising bacterial inoculants ought to mandate further evaluation in drought-affected areas across different agro-climatic zones and comprehensive biosafety analyses, in line with the 'one health' concept.