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Abstract <p>We investigated the effect of the combination of the plant-growth-promoting rhizobacteria <i>Azospirillum baldaniorum</i> Sp245 and <i>Ochrobactrum cytisi</i> IPA7.2 on the activity of the pro- and antioxidant systems of potato (<i>Solanum tuberosum</i> L., cv. ‘Nevsky’) microclones osmotically stressed (–0.3 MPa, 7 days) in vitro. Polyethylene glycol itself inhibited plant growth. In the absence of osmotic stress, bacterial inoculation increased shoot length and shoot fresh weight by an average of 34% and root number by 25%. Inoculation contributed to mitigation of osmotic stress by leading to a 22% increase in shoot length. During repair, shoot length and root number in inoculated plants increased by an average of 18%. Under stress, bacterial inoculation resulted in a 25% increase in catalase activity and a 21% increase in leaf proline content. As a result, the leaf content of hydrogen peroxide and malondialdehyde decreased by 60 and 30%, respectively, under stress and on average by 30% upon recovery<b>.</b> Both under stress and during repair, cells of either bacterial strain were visible on plant roots by immunofluorescence microscopy. Thus, bacterial inoculation promotes changes in the antioxidant status of potato microclones under osmotic stress in vitro, reduction of oxidative damage to plants, and faster plant recovery after stress.</p>

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Rhizobacteria in the Regulation of the Pro- and Antioxidant Systems of Potato Osmotically Stressed In Vitro

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • N. V. Evseeva,
  • A. Yu. Denisova,
  • O. V. Tkachenko,
  • A. A. Shirokov,
  • N. N. Pozdnyakova,
  • G. L. Burygin,
  • L. Yu. Matora,
  • S. Yu. Shchyogolev

摘要

Abstract

We investigated the effect of the combination of the plant-growth-promoting rhizobacteria Azospirillum baldaniorum Sp245 and Ochrobactrum cytisi IPA7.2 on the activity of the pro- and antioxidant systems of potato (Solanum tuberosum L., cv. ‘Nevsky’) microclones osmotically stressed (–0.3 MPa, 7 days) in vitro. Polyethylene glycol itself inhibited plant growth. In the absence of osmotic stress, bacterial inoculation increased shoot length and shoot fresh weight by an average of 34% and root number by 25%. Inoculation contributed to mitigation of osmotic stress by leading to a 22% increase in shoot length. During repair, shoot length and root number in inoculated plants increased by an average of 18%. Under stress, bacterial inoculation resulted in a 25% increase in catalase activity and a 21% increase in leaf proline content. As a result, the leaf content of hydrogen peroxide and malondialdehyde decreased by 60 and 30%, respectively, under stress and on average by 30% upon recovery. Both under stress and during repair, cells of either bacterial strain were visible on plant roots by immunofluorescence microscopy. Thus, bacterial inoculation promotes changes in the antioxidant status of potato microclones under osmotic stress in vitro, reduction of oxidative damage to plants, and faster plant recovery after stress.