African Journal of
Plant Science

  • Abbreviation: Afr. J. Plant Sci.
  • Language: English
  • ISSN: 1996-0824
  • DOI: 10.5897/AJPS
  • Start Year: 2007
  • Published Articles: 677

Full Length Research Paper

Physiological characterization of NADP-malic enzyme activity under 2,4-D toxicity in an aquatic fern, Azolla pinnata R.Br.

A. Kumar De
  • A. Kumar De
  • Plant Physiology and Plant Molecular Biology Research Unit, Department of Botany, University of Kalyani, Kalyani, 74 1235, India.
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B. Sarkar
  • B. Sarkar
  • Plant Physiology and Plant Molecular Biology Research Unit, Department of Botany, University of Kalyani, Kalyani, 74 1235, India.
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I. Saha
  • I. Saha
  • Plant Physiology and Plant Molecular Biology Research Unit, Department of Botany, University of Kalyani, Kalyani, 74 1235, India.
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A. Ghosh
  • A. Ghosh
  • Plant Physiology and Plant Molecular Biology Research Unit, Department of Botany, University of Kalyani, Kalyani, 74 1235, India.
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N. Dey
  • N. Dey
  • Department of Biotechnology, Faculty of Science, Visva-Bharati University, Santiniketan, India.
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M. K. Adak
  • M. K. Adak
  • Plant Physiology and Plant Molecular Biology Research Unit, Department of Botany, University of Kalyani, Kalyani, 74 1235, India.
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  •  Received: 08 May 2018
  •  Accepted: 10 August 2018
  •  Published: 30 September 2018

Abstract

This work proposes NADP-ME activity as bio-indices for herbicidal sensitivity in Azolla pinnata R.Br. under 2,4-D toxicity. Azolla fronds were illuminated under saturated photosynthetic flux and bicarbonate induction. There was significant variation in the NADP-ME activity under light and dark conditions. This increased more when varying concentrations of 2,4-D were used for the up regulation of enzyme activity especially under illumination. There was evident modulation through activators (citrate and succinate) and inhibitors (pyruvate and oxaloacetate) under light and dark conditions at 2,4-D concentration. This occurs at the same time in overriding the herbicidal stress linked to the adjustment of the cellular redox of regulatory sites using dithiothreitol. This shows that Azolla can quench 2,4-D, which suggests  NADP-ME  as a biomarker through its sensitivity and mode of activities under xenobiotic contaminated soil.

 

Key words: NADP-malic enzyme, aquatic fern, herbicide, modulators, malate.

Abbreviation

2,4-D, 2,4-Dichloro phenoxy-acetic acid; NADP-ME, NADP linked Malic Enzyme; ROS, Reactive Oxygen Species; RH, Relative Humidity; MS Media, Murashige and Skoog media; MgCl2, Magnesium Chloride; PMSF, Phenylmethylsulfonyl fluoride; EDTA, Ethylene diamine tetraacetic acid; DTT, Di-thio threitol.