Acta Agronomica Hungarica
Volume/Issue:
Volume 57: Issue 4
Enzymatic antioxidant defence mechanisms of maize and sorghum after exposure to and recovery from pre- and post-flowering dehydration
Authors:
A. Takele University of Cape Town Department of Botany Rondebosch, Cape Town South Africa

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and
J. Farrant University of Cape Town Department of Molecular and Cell Biology Rondebosch, Cape Town South Africa

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Pages:
445–459
Online Publication Date:
21 Nov 2009
Publication Date:
01 Dec 2009
Article Category:
Research Article
DOI:
https://doi.org/10.1556/AAgr.57.2009.4.7
Keywords:
dehydration; enzymatic antioxidants; malondialdehyde; reactive oxygen species; rehydration
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Drought stress is often the most limiting factor for maize and sorghum production in the semi-arid areas. This study evaluates the enzymatic antioxidant protection mechanism response of maize (cv Melkassa-2) and sorghum (cv. Macia) after exposure to and recovery from pre- and post-flowering dehydration.The response of enzymatic antioxidant protection systems revealed that in both test crops dehydration during both the pre- and post-flowering stages resulted in increased activities of enzymatic antioxidant protection mechanisms (SOD, GR, CAT and APX). There were, however, differences between the species in the type and extent of enhanced developmentally-induced and dehydration-induced antioxidant activities. Differences were also noticed in the relative water contents at which changes in enzymatic antioxidant activities occurred. Under dehydration conditions, sorghum was generally found to have relatively higher enzymatic antioxidant activities, providing it better protection against oxidative stress by minimizing the level of lipid peroxidation.Lipid peroxidation, measured as MDA content, was increased in both species during pre- and post-flowering dehydration, but the increase was greater in maize than in sorghum during both developmental stages. Sorghum appeared to be able to reduce MDA on rehydration, but maize contained only 85% less MDA after rehydration as compared to the control following pre-flowering rehydration. During post-flowering rehydration, neither species was able to decrease the MDA content to the control level.The results indicated that tolerance to drought in sorghum is well associated with the consistent enhanced capacity of the enzymatic antioxidant system under both pre- and post-flowering dehydration conditions, and that the sensitivity of maize to drought is linearly correlated to the decreased capacity of the antioxidant system. It may be concluded that, since differences were observed between the species in the response of enzymatic antioxidants to pre- and post-flowering dehydration/rehydration, with sorghum exhibiting comparatively higher overall activities of enzymatic antioxidants and a lower level of MDA than maize during both pre- and post-flowering dehydration, selection based on these criteria may help in the development of genotypes tolerant to dehydration.

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Cover Acta Agronomica Hungarica
Acta Agronomica Hungarica
Print ISSN:
0238-0161
Online ISSN:
1588-2527

Acta Agronomica Hungarica
Language English
Russian
German
French
Size  
Year of
Foundation		 1950
Publication
Programme		 ceased
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per Year		  
Issues
per Year		  
Founder Magyar Tudományos Akadémia   
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Address		 H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
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Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0238-0161 (Print)
ISSN 1588-2527 (Online)

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