Modeling and Cr(VI) ion uptake kinetics of Sorghum bicolor plant assisted by plant growth–promoting Pannonibacter phragmetitus: an ecofriendly approach

  • Ponnambalam Ragini Yaashikaa
  • Ponnusamy Senthil KumarEmail author
  • Anbalagan Saravanan
Sustainable Industrial and Environmental Bioprocesses


The research work focuses on the application of Cr(VI)-resistant plant growth–promoting bacteria Pannonibacter phragmetitus for enhancing Cr(VI) uptake by Sorghum bicolor. Significant increase in plant shoot and root characters was found when assisted by P. phragmetitus. The obtained strain showed 700 mg/L of chromium reduction at 24-h incubation. Indole-3 acetic acid (IAA) production by the bacterial strain was found to be 86.45 μg/mL. Pannonibacter phragmetitus solubilized tricalcium phosphate showing maximum solubilizing activity of PSI = 3.31. The qmax of P. phragmetitus was high in the wavelength of 600 nm. Langmuir isotherm best described the Cr(VI) ion uptake by the plant. The RL values reliably reduced with expanding Cr(VI) ion concentration from 25 to 150 mg/L. The outcomes of kinetic studies showed that compared with pseudo first-order, pseudo second-order kinetics better describes the plant Cr(VI) uptake rate. Elovich model describes the increased rates for attaining equilibrium. The equilibrium parameter values for different Cr(VI) ion concentrations range between 0 and 1 which describes the favorable condition for plant metal uptake at different concentrations.

Graphical abstract


Pannonibacter phragmetitus Sorghum bicolor Phytoaccumulation Uptake kinetics Isotherm 



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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Ponnambalam Ragini Yaashikaa
    • 1
  • Ponnusamy Senthil Kumar
    • 1
    Email author
  • Anbalagan Saravanan
    • 2
  1. 1.Department of Chemical EngineeringSSN College of EngineeringChennaiIndia
  2. 2.Department of BiotechnologyRajalakshmi Engineering CollegeChennaiIndia

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