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<p>Around 55% of the rice soils in West Bengal, the highest rice-producing state in eastern India, are deficient in zinc (Zn), leading to Zn malnutrition among its population due to huge reliance on rice for calories. The present investigation tested the feasibility of native zinc-solubilizing bacteria (ZnSB) to improve the Zn bioavailability and subsequent biofortification of rice grown in Gangetic alluvial soils that are low in Zn. Initially, 56 bacterial isolates were recovered from the rice rhizosphere of Zn-deficient soils, and 20 were found to solubilize insoluble Zn in agar plates. Among the 20 bacterial strains, Zn solubilizing potential was maximum for the isolate <i>Burkholderia cepacia</i> strain K1. It showed 775% Zn solubilizing efficiency, releasing 576.67&#xa0;µg/mL Zn from zinc oxide in liquid medium and lowering the solution pH by 2.87 units. Principal component analysis revealed that K1, along with strains K2 and B4, produced the best results when testing Zn solubilization ability alongside indole-3-acetic acid production (18.5–24.6&#xa0;µg/mL) and metabolic adaptability for all tested carbon sources. In the pot experiment, root biopriming with K1 significantly increased soil available Zn by 105.8%, rice grain yield by 19.9%, and grain Zn concentration by 36.3% over the control treatment, which produced 12.69&#xa0;g grain/pot with a Zn concentration of 24.33&#xa0;µg/g grain. The experimental findings illustrate that native ZnSB strains K1, K2, and B4 shows promise for reducing Zn deficiency in rice fields as a sustainable solution while managing malnutrition and soil health.</p>

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Rhizosphere bacteria improve zinc bioavailability and nutritional quality of rice in zinc-deficient soils of eastern India

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • Narendra Bharati,
  • Niharendu Saha,
  • Arup Sen,
  • Anwesha Samanta

摘要

Around 55% of the rice soils in West Bengal, the highest rice-producing state in eastern India, are deficient in zinc (Zn), leading to Zn malnutrition among its population due to huge reliance on rice for calories. The present investigation tested the feasibility of native zinc-solubilizing bacteria (ZnSB) to improve the Zn bioavailability and subsequent biofortification of rice grown in Gangetic alluvial soils that are low in Zn. Initially, 56 bacterial isolates were recovered from the rice rhizosphere of Zn-deficient soils, and 20 were found to solubilize insoluble Zn in agar plates. Among the 20 bacterial strains, Zn solubilizing potential was maximum for the isolate Burkholderia cepacia strain K1. It showed 775% Zn solubilizing efficiency, releasing 576.67 µg/mL Zn from zinc oxide in liquid medium and lowering the solution pH by 2.87 units. Principal component analysis revealed that K1, along with strains K2 and B4, produced the best results when testing Zn solubilization ability alongside indole-3-acetic acid production (18.5–24.6 µg/mL) and metabolic adaptability for all tested carbon sources. In the pot experiment, root biopriming with K1 significantly increased soil available Zn by 105.8%, rice grain yield by 19.9%, and grain Zn concentration by 36.3% over the control treatment, which produced 12.69 g grain/pot with a Zn concentration of 24.33 µg/g grain. The experimental findings illustrate that native ZnSB strains K1, K2, and B4 shows promise for reducing Zn deficiency in rice fields as a sustainable solution while managing malnutrition and soil health.