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Biological Trace Element Research

, Volume 144, Issue 1–3, pp 1295–1301 | Cite as

Lead (Pb)-Inhibited Radicle Emergence in Brassica campestris Involves Alterations in Starch-Metabolizing Enzymes

  • Harminder Pal Singh
  • Gurpreet Kaur
  • Daizy R. Batish
  • Ravinder K. Kohli
Article

Abstract

Lead (Pb) is a toxic heavy metal released into the natural environment and known to cause oxidative damage and alter antioxidant mechanism in plants. However, not much is known about the interference of Pb with the biochemical processes and carbohydrate metabolism during seed germination. We, therefore, investigated the effect of Pb (50–500 μM) upon biochemical alterations in germinating seeds (at 24-h stage) of Brassica campestris L. Pb treatment significantly enhanced protein and carbohydrate contents that increased by ~43% and 200%, respectively, at 500-μM Pb over control. In contrast, the activities of starch/carbohydrate-metabolizing enzymes—α-amylases, β-amylases, acid invertases, and acid phosphatases—decreased by ~54%, 60%, 74%, and 52%, respectively, over control. Activities of peroxidases and polyphenol oxidases, involved in stress acclimation, however, increased by ~1.2- to 3.9-folds and 0.4- to 1.4-folds upon 50–500-μM Pb treatment. Pb enhanced oxidizing ability by 10 to 16.7 times over control suggesting interference with emerging root’s oxidizing capacity. The study concludes that Pb exposure inhibits radicle emergence from B. campestris by interfering with the biochemical processes linked to protein and starch metabolism.

Keywords

Acid invertases Acid phosphatases Amylases Macromolecular content Pb toxicity Polyphenol oxidase Starch metabolism 

Notes

Acknowledgement

Gurpreet Kaur is thankful to University Grants Commission (UGC) India for the financial support in the form of fellowship.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Harminder Pal Singh
    • 1
  • Gurpreet Kaur
    • 1
  • Daizy R. Batish
    • 2
  • Ravinder K. Kohli
    • 2
  1. 1.Department of Environment StudiesPanjab UniversityChandigarhIndia
  2. 2.Department of BotanyPanjab UniversityChandigarhIndia

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