Ameliorative effect of exogenously applied oxalic acid on nickel heavy metal induced stress in Zea mays | [Pakistan Journal of Botany • 2020]

Author(s):

1. OLUWAGBEMIGA SEWANU SOYINGBE: Research, Innovation and Engagements Portfolio, Mangosuthu University of Technology Durban

2. COMRADE NTANZI: Biotechnology and Structural Biochemistry Group, Department of Biochemistry and Microbiology, University of Zululand,Kwa Dlangezwa 3886,South Africa

3. TSHEPISO JAN MAKHAFOLA: Research, Innovation and Engagements Portfolio, Mangosuthu University of Technology Durban

4. ABIDEMI PAUL KAPPO: Biotechnology and Structural Biochemistry Group, Department of Biochemistry and Microbiology, University of Zululand,Kwa Dlangezwa 3886,South Africa

Abstract:

Oxalic acid (ethanedioic acid: OA) is the simplest organic acid occurring naturally in plants. It functions as a chelator of metals. The effects of the exogenous application of OA (1000 µM) on maize plants' (Zea mays) growth parameters and superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT; EC 1.11.1.6), reduced glutathione (GSH) and lipid peroxide contents were evaluated in the presence or absence of nickel (Ni) induced stress. The plants were treated with 200 µM and 400 µM of nickel sulphate (NiSO4) solution. At the end of the 29-day treatment period, OA enhanced SOD, GSH and catalase activity. The level of lipid peroxidation as determined by TBARS (thiobarbiturate reactive species) was decreased significantly. OA improved the growth parameters of maize plants under nickel induced stress (that is: the root length, root fresh weight and root dry weight all were increased compared to the control). This is a clear indication that OA ameliorates heavy metal stress in maize via biochemical pathways in which it acts as an important chelator and detoxifier of nickel. It thereby depletes the pool of Ni available for the production of free radicals.

Page(s): 413-418

DOI: 10.30848/PJB2020-2(14)

Published: Journal: Pakistan Journal of Botany, Volume: 52, Issue: 2, Year: 2020

Keywords:

Heavy metals , Zea mays , Nickel , Reactive oxygen species , Oxalic acid

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