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Inoculation of

Xia Kang1,2, Xiumei Yu1, Yu Zhang1

  • 1College of Resources, Sichuan Agricultural University, Chengdu, China.

Frontiers in Microbiology
|September 14, 2018
PubMed
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Sinorhizobium saheli YH1 enhances Leucaena leucocephala growth and nutrient uptake in metalliferous mine tailings. This beneficial bacteria reduces heavy metal absorption, aiding phytoremediation and revegetation efforts in polluted soils.

Area of Science:

  • Environmental Microbiology
  • Soil Science
  • Plant Science

Background:

  • Metalliferous mine tailings degrade soil quality and reduce land fertility.
  • Phytoremediation using legume-rhizobia symbiosis offers a sustainable solution for contaminated soil remediation.
  • Leucaena leucocephala establishes symbiotic relationships with native rhizobia in iron-vanadium-titanium (V-Ti) mine tailing soils.

Purpose of the Study:

  • To isolate and identify rhizobia from L. leucocephala in V-Ti mine tailings.
  • To evaluate the plant growth-promoting and metal-reducing capabilities of the isolated rhizobia.
  • To assess the potential of L. leucocephala-rhizobia symbiosis for phytoremediation of contaminated soils.

Main Methods:

  • Isolation and identification of rhizobia using 16S rRNA, housekeeping, and nitrogen fixation genes.
Keywords:
Leucaena leucocephalaSinorhizobiumheavy metalsmine tailingsphytoremediation

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  • Characterization of rhizobia for indole-acetic acid (IAA) production and phosphate solubilization.
  • Pot culture experiments to evaluate the effects of rhizobia inoculation on L. leucocephala growth, nutrient content, and metal uptake.

    • Main Results:

    • Rhizobia YH1 was identified as Sinorhizobium saheli, exhibiting IAA production and phosphate solubilization.
    • Inoculation with S. saheli YH1 significantly increased L. leucocephala biomass, height, and root length.
    • Inoculation reduced the uptake of cadmium (Cd) and manganese (Mn) by L. leucocephala in contaminated soils.

    Conclusions:

    • Sinorhizobium saheli YH1 demonstrates multiple plant growth-promoting traits beneficial for L. leucocephala.
    • S. saheli YH1 application improves plant health and reduces heavy metal accumulation in metalliferous soils.
    • The L. leucocephala-S. saheli association is a promising strategy for phytoremediation and revegetation of V-Ti mine tailings and Cd/Mn-polluted soils.