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Differential antioxidative response of tolerant and sensitive maize (<i style="mso-bidi-font-style:normal">Zea mays</i> L.) genotypes to drought stress at reproductive stage

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Title Differential antioxidative response of tolerant and sensitive maize (Zea mays L.) genotypes to drought stress at reproductive stage
 
Creator Chugh, Vishal
Kaur, Narinder
Grewal, M S
Gupta, Anil K
 
Subject Zea mays L.
Maize
Antioxidant system
Drought stress
Lipid peroxidation
Oxidative stress
Reproductive stage
 
Description 150-158
The role of
oxidative stress management was evaluated in two maize (Zea mays L.)
genotypes — Parkash
(drought-resistant) and Paras (drought-sensitive), subjected to drought stress
during reproductive stage. Alterations in their
antioxidant pools — glutathione (GSH) and ascorbic acid (AsA) combined with
activities of enzymes glutathione reductase (GR), ascorbate peroxidase (APX),
peroxidase (POX) and catalase (CAT) involved in defense against oxidative
stress and stress parameters, namely chlorophyll (Chl), hydrogen peroxide (H2O2) and malondialdehyde (MDA) were
investigated in flag leaves from silk emergence till maturity. The drought
caused transient increase in GR, APX, POX and CAT activities in
drought-tolerant genotype (Parkash) which decreased at later stages with the
extended period of drought stress. However, in Paras, drought stress caused decrease
in activities of GR and CAT from initial period of stress till the end of
experiment, except for POX which showed slight increase in activity. A
significant increase in GSH content was observed in Parkash till 35 days after
silking (DAS), whereas in Paras, GSH content remained lower than irrigated till
maturity. Parkash which had higher AsA and Chl contents, also showed lower H2O2
and MDA levels than Paras under drought stress conditions. However, at the later stages, decline in antioxidant enzyme activities
in Parkash due to severe drought stress led to enhanced membrane damage, as
revealed by the accumulation of MDA. Our data indicated
that significant activation of antioxidant system in Parkash might be
responsible for its drought-tolerant behavior under drought stress and helped
it to cope with the stress up to a definite period. Thus, the results indicate
that antioxidant status and lipid peroxidation in flag leaves can be used as
indices of drought tolerance in maize plants and also as potential biochemical targets for the crop improvement programmes to
develop drought-tolerant cultivars.
 
Date 2013-04-22T09:45:36Z
2013-04-22T09:45:36Z
2013-04
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://hdl.handle.net/123456789/17258
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJBB Vol.50(2) [April 2013]