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Environmental Science and Pollution Research

, Volume 24, Issue 15, pp 13452–13465 | Cite as

Effect of earthworms on growth, photosynthetic efficiency and metal uptake in Brassica juncea L. plants grown in cadmium-polluted soils

  • Parminder Kaur
  • Shagun Bali
  • Anket Sharma
  • Adarsh Pal Vig
  • Renu BhardwajEmail author
Research Article

Abstract

The present study has been carried out to examine the role of earthworms in phytoremediation of Cd and its effect on growth, pigment content, expression of genes coding key enzymes of pigments, photosynthetic efficiency and osmoprotectants in Brassica juncea L. plants grown under cadmium (Cd) metal stress. The effect of different Cd concentrations (0.50, 0.75, 1.0, 1.25 mM) was studied in 30 and 60-day-old plants grown in soils containing earthworms. It was observed that earthworm inoculation showed stimulatory effect on phytoremediation capacity and Cd uptake has increased by 49% (in 30-day-old plants) and 35% (in 60-day-old plants) in shoots and 13.3% (in 30-day-old plants) and 10% (in 60-day-old plants) in roots in 30 and 60-day-old plants in Cd (1.25 mM) treatments. Plant growth parameters such as root and shoot length, relative water content and tolerance index were found to increase in the presence of earthworms. Recovery in photosynthetic pigments (chlorophyll and carotenoid) and gas exchange parameters, i.e. net photosynthetic rate (P n ), stomatal conductance (G s ), intercellular CO2 concentration (C i ) and transpiration rate (E t ), was observed after earthworm’s supplementation. Modulation in expression of key enzymes for pigment synthesis, i.e. chlorophyllase, phytoene synthase, chalcone synthase and phenylalanine ammonia lyase, was also observed. The results of our study revealed that earthworms help to mitigate the toxic effects produced by Cd on plant growth and photosynthetic efficiency along with enhanced phytoremediation capacity when co-inoculated with Cd in soil.

Keywords

Chlorophyllase Tolerance index Stomatal conductance Phytoremediation Osmoprotectants Gene expression 

Notes

Acknowledgements

Research fellowship to the first author was provided by University Grants Commission, under the Maulana Azad National Fellowship (MANF) scheme. The authors are also thankful to the University Grants Commission, New Delhi, for establishing sophisticated instrumentation facilities in the university campus under the Universities with Potential for Excellence (UPE) scheme.

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© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Department of Botanical and Environmental SciencesGuru Nanak Dev UniversityAmritsarIndia

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