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<p>The research aims to investigate the combined effects of vermicompost (VC) and plant growth-promoting rhizobacteria (PGPR) on enhancing photosynthetic activity, nutrient uptake, and defense responses in <i>Brassica juncea</i> cv. Pusa Jagannath grown under salt stress conditions.&#xa0;In a randomized complete block design, 50% of VC (soil to VC ratio was 1:1) was given to pots before sowing of seeds and salt-tolerant PGPR (<i>Pseudomonas fluorescens; P. fluorescens</i>) were coated on <i>Brassica juncea</i> seeds using guar gum to evaluate their potential in salt alleviation. Sampling was done at 30 days after sowing (DAS) to analyse physiological and biochemical changes and yield parameters were recorded at harvest. Salt stress was induced by watering the pots with 600 mL of a 100 mM NaCl solution after the emergence of leaves.&#xa0;The combined VC and PGPR treatment produced significant improvements and increased chlorophyll content by 42.5%, net photosynthetic rate by 43.5%, enhanced content of nitrogen (N) and sulfur (S) and their photosynthetic use efficiency under salt stress. The combination was better than individual treatment in increasing osmolytes and antioxidants that decreased the reactive oxygen species (ROS) to reduce salt-stress impact and enhanced biomass accumulation and yield.&#xa0;The study demonstrates that integrating VC and <i>P. fluorescens</i> represents an effective and sustainable agronomic strategy to enhance stress resilience in salt-affected soils by promoting better photosynthetic use efficiency of nutrients. It helps in strengthening plant defense mechanisms against salt-induced oxidative stress in an environmentally friendly mechanism.</p>

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Vermicompost with Pseudomonas Fluorescens Improves Salt Resilience in Brassica Juncea via Enhanced Nutrients Accumulation and Defence System

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Varisha Khan,
  • Ufaiz Altaf,
  • Shahid Umar,
  • Noushina Iqbal

摘要

The research aims to investigate the combined effects of vermicompost (VC) and plant growth-promoting rhizobacteria (PGPR) on enhancing photosynthetic activity, nutrient uptake, and defense responses in Brassica juncea cv. Pusa Jagannath grown under salt stress conditions. In a randomized complete block design, 50% of VC (soil to VC ratio was 1:1) was given to pots before sowing of seeds and salt-tolerant PGPR (Pseudomonas fluorescens; P. fluorescens) were coated on Brassica juncea seeds using guar gum to evaluate their potential in salt alleviation. Sampling was done at 30 days after sowing (DAS) to analyse physiological and biochemical changes and yield parameters were recorded at harvest. Salt stress was induced by watering the pots with 600 mL of a 100 mM NaCl solution after the emergence of leaves. The combined VC and PGPR treatment produced significant improvements and increased chlorophyll content by 42.5%, net photosynthetic rate by 43.5%, enhanced content of nitrogen (N) and sulfur (S) and their photosynthetic use efficiency under salt stress. The combination was better than individual treatment in increasing osmolytes and antioxidants that decreased the reactive oxygen species (ROS) to reduce salt-stress impact and enhanced biomass accumulation and yield. The study demonstrates that integrating VC and P. fluorescens represents an effective and sustainable agronomic strategy to enhance stress resilience in salt-affected soils by promoting better photosynthetic use efficiency of nutrients. It helps in strengthening plant defense mechanisms against salt-induced oxidative stress in an environmentally friendly mechanism.