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<p>Plant growth-promoting rhizobacteria are crucial in enhancing plant tolerance to saline stress. To investigate the role of <i>Arabidopsis thaliana</i> phospholipase Dα1 (PLDα1) and <i>Azospirillum baldaniorum</i> Sp245 in adaptation to saline conditions, PLDα1 WT, overexpressing (OE) and knockout (KO) mutant lines were inoculated with the bacterium. <i>A. baldaniorum</i> Sp245 increased biomass and noteworthy, OE plants had greater root hair elongation than KO and WT plants. The root hair phenotype of PLDα1 overexpressors could be maintained upon 100&#xa0;mM NaCl application, while biomass production was comparable to the WT. Sp245 improved growth parameters such as lateral root number and total fresh weight under saline conditions in PLDα1 OE and KO lines, with contrasting effects on root hair development, which was promoted in the OE and abrogated in KO plants. Sp245 inoculation under saline stress promoted stomatal aperture in the WT, OE and KO lines, which correlated with decreased in phosphatidic acid (PA) levels. These findings involve PLDα1 in orchestrating plant growth, epidermal cell elongation, and PA production in <i>A. thaliana</i> as a response to <i>A. baldaniorum</i> Sp245 under saline stress. The role of PLDα1 in modulating stomatal movement in response to inoculation and saline conditions is also discussed.</p>

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PLDα1 improves saline stress tolerance in Arabidopsis thaliana inoculated with Azospirillum baldaniourum Sp245

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Estefanía Irepan-Villa,
  • Aynare Yazmín Tapia-Vargas,
  • Estefanía Álvarez-Martínez,
  • Elvira Romero-Catarino,
  • Alma Alejandra Hernández-Esquivel,
  • Elda Castro-Mercado,
  • José López-Bucio,
  • Ernesto García-Pineda

摘要

Plant growth-promoting rhizobacteria are crucial in enhancing plant tolerance to saline stress. To investigate the role of Arabidopsis thaliana phospholipase Dα1 (PLDα1) and Azospirillum baldaniorum Sp245 in adaptation to saline conditions, PLDα1 WT, overexpressing (OE) and knockout (KO) mutant lines were inoculated with the bacterium. A. baldaniorum Sp245 increased biomass and noteworthy, OE plants had greater root hair elongation than KO and WT plants. The root hair phenotype of PLDα1 overexpressors could be maintained upon 100 mM NaCl application, while biomass production was comparable to the WT. Sp245 improved growth parameters such as lateral root number and total fresh weight under saline conditions in PLDα1 OE and KO lines, with contrasting effects on root hair development, which was promoted in the OE and abrogated in KO plants. Sp245 inoculation under saline stress promoted stomatal aperture in the WT, OE and KO lines, which correlated with decreased in phosphatidic acid (PA) levels. These findings involve PLDα1 in orchestrating plant growth, epidermal cell elongation, and PA production in A. thaliana as a response to A. baldaniorum Sp245 under saline stress. The role of PLDα1 in modulating stomatal movement in response to inoculation and saline conditions is also discussed.