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<p>Biofertilizer and biostimulative activities of silicon (Si) and Plant Growth-Promoting Rhizobacteria (PGPR) including nitrogen-fixing rhizobia (Rh), could enhance drought tolerance in legume plants. In this study, we aimed to evaluate the synergistic effects of Si, PGPR, and Rh in mitigating the negative effects of water deficit on chickpea plants. The experiment was conducted under greenhouse conditions. The seedlings were treated with Si (1.5 mM CaSiCO<sub>3</sub>) and/or inoculated with PGPR (<i>Pseudomonas helmanticensis</i> OHA11T) and/or Rh (<i>Mesorhizobium sp</i>) strains. They were subjected to two levels of irrigation regime, 80% of field capacity (FC) as a control against 40% FC for water deficit stress during 60 days. The obtained results showed that water deficit conditions significantly <i>p</i> &lt; 0.05 reduced plant growth, relative water content, and photosynthesis-related parameters (chlorophyll content, the maximum quantum efficiency of photosystem II (<i>F</i><sub><i>v</i></sub><i>/F</i><sub><i>m</i></sub>), and carotenoid content) and inorganic ion contents. However, the application of Si, combined with inoculation with PGPR and Rh strains, significantly <i>p</i> &lt; 0.05 enhanced plant growth and photosynthesis-related parameters. The synergistic effects of Si, PGPR and Rh were evident in improving the accumulation of compatible solutes (proline, total soluble sugars and glycine betaine) and the inorganic ion contents, maintaining the membrane cell stability, and neutralizing the oxidative stress effects by inducing the various non-enzymatic and enzymatic antioxidant activities such as polyphenols, superoxide dismutase and guaiacol peroxidase. Our findings suggested that the combination of Si, Rh and PGPR could be an effective approach for enhancing chickpea tolerance to water deficit.</p>

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The combination of exogenous silicon and plant growth-promoting rhizobacteria improves water deficit tolerance in chickpea

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Habiba Kamal,
  • Omar Farssi,
  • Cherki Ghoulam,
  • Mohamed Farissi

摘要

Biofertilizer and biostimulative activities of silicon (Si) and Plant Growth-Promoting Rhizobacteria (PGPR) including nitrogen-fixing rhizobia (Rh), could enhance drought tolerance in legume plants. In this study, we aimed to evaluate the synergistic effects of Si, PGPR, and Rh in mitigating the negative effects of water deficit on chickpea plants. The experiment was conducted under greenhouse conditions. The seedlings were treated with Si (1.5 mM CaSiCO3) and/or inoculated with PGPR (Pseudomonas helmanticensis OHA11T) and/or Rh (Mesorhizobium sp) strains. They were subjected to two levels of irrigation regime, 80% of field capacity (FC) as a control against 40% FC for water deficit stress during 60 days. The obtained results showed that water deficit conditions significantly p < 0.05 reduced plant growth, relative water content, and photosynthesis-related parameters (chlorophyll content, the maximum quantum efficiency of photosystem II (Fv/Fm), and carotenoid content) and inorganic ion contents. However, the application of Si, combined with inoculation with PGPR and Rh strains, significantly p < 0.05 enhanced plant growth and photosynthesis-related parameters. The synergistic effects of Si, PGPR and Rh were evident in improving the accumulation of compatible solutes (proline, total soluble sugars and glycine betaine) and the inorganic ion contents, maintaining the membrane cell stability, and neutralizing the oxidative stress effects by inducing the various non-enzymatic and enzymatic antioxidant activities such as polyphenols, superoxide dismutase and guaiacol peroxidase. Our findings suggested that the combination of Si, Rh and PGPR could be an effective approach for enhancing chickpea tolerance to water deficit.