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Purpose <p>This study aimed to overcome nutrient deficiency in the soil through rhizobacteria to enhance nutrient availability and quinoa productivity. We investigated the ability of bacterial strains isolated from quinoa rhizosphere to solubilize insoluble minerals and to produce various in vitro plant growth-promoting traits. The potential bacterial strains were tested simultaneously in pot and field trials under nutrient-deficient conditions to promote stomatal conductance, plant growth, yield attributes, and nutrient uptake in quinoa. The tested bacterial strains belong to diverse bacterial genera, including <i>Pseudoxanthomonas</i>, <i>Lysinibacillus</i>, <i>Cytobacillus</i>, <i>Kocuria</i>, <i>Achromobacter</i>, <i>Bacillus</i>, <i>Agrobacterium</i>, and <i>Priestia</i> identified through 16&#xa0;S rRNA gene sequencing. They solubilized the insoluble minerals of phosphate, potassium, zinc, and manganese and were well-capable to produce indole acetic acid, siderophores, hydrogen cyanide, and exopolysaccharides, and demonstrated various in vitro enzymatic activities. These bacterial strains significantly promoted quantum flux, transpiration rate, relative humidity, diffusive resistance, shoot and root growth, grain yield traits (seed yield, biological yield, spike length, spike count, grain weight), and nutrient uptake (nitrogen, phosphorus, potassium, zinc) in root and shoot. <i>Priestia aryabhattai</i> Cq-19 demonstrated a significant increase in nitrogen (48% in root; 41% in shoot), phosphorus (67% in root; 87% in shoot), potassium (92% in root; 78% in shoot), and zinc contents (101% in root and 91% in shoot) compared to uninoculated control. This study highlights the potential rhizobacterial strain as a bioinoculant for quinoa cultivation through solubilizing insoluble minerals in nutrient-deficient conditions.</p>

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Plant Growth Promoting Rhizobacteria Regulated Nutrient Uptake in Quinoa (Chenopodium Quinoa Wild) Under Nutrient-Deficient Conditions Through Solubilizing Insoluble Minerals

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Ejaz Rafique,
  • Muhammad Zahid Mumtaz,
  • Lingling Li,
  • Inam Ullah,
  • Talha Ali Chohan,
  • Muhammad Waqar Alam,
  • Adnan Mustafa,
  • Waleed A. A. Alsakkaf,
  • Hayssam M. Ali

摘要

Purpose

This study aimed to overcome nutrient deficiency in the soil through rhizobacteria to enhance nutrient availability and quinoa productivity. We investigated the ability of bacterial strains isolated from quinoa rhizosphere to solubilize insoluble minerals and to produce various in vitro plant growth-promoting traits. The potential bacterial strains were tested simultaneously in pot and field trials under nutrient-deficient conditions to promote stomatal conductance, plant growth, yield attributes, and nutrient uptake in quinoa. The tested bacterial strains belong to diverse bacterial genera, including Pseudoxanthomonas, Lysinibacillus, Cytobacillus, Kocuria, Achromobacter, Bacillus, Agrobacterium, and Priestia identified through 16 S rRNA gene sequencing. They solubilized the insoluble minerals of phosphate, potassium, zinc, and manganese and were well-capable to produce indole acetic acid, siderophores, hydrogen cyanide, and exopolysaccharides, and demonstrated various in vitro enzymatic activities. These bacterial strains significantly promoted quantum flux, transpiration rate, relative humidity, diffusive resistance, shoot and root growth, grain yield traits (seed yield, biological yield, spike length, spike count, grain weight), and nutrient uptake (nitrogen, phosphorus, potassium, zinc) in root and shoot. Priestia aryabhattai Cq-19 demonstrated a significant increase in nitrogen (48% in root; 41% in shoot), phosphorus (67% in root; 87% in shoot), potassium (92% in root; 78% in shoot), and zinc contents (101% in root and 91% in shoot) compared to uninoculated control. This study highlights the potential rhizobacterial strain as a bioinoculant for quinoa cultivation through solubilizing insoluble minerals in nutrient-deficient conditions.