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Indian Journal of Biochemistry and Biophysics (IJBB) >
IJBB Vol.48 [2011] >
IJBB Vol.48(1) [February 2011] >
| Title: | Evaluation of oxidative stress tolerance in maize (Zea mays L.) seedlings in response to drought |
| Authors: | Chugh, Vishal
Kaur, Narinder
Gupta, Anil K |
| Keywords: | Zea mays L.
Maize
Drought
Antioxidant system
Lipid peroxidation |
| Issue Date: | Feb-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Seedlings of selected six genotypes of maize (Zea mays L.) differing in their drought sensitivity (LM5 and
Parkash drought-tolerant and PMH2, JH3459, Paras and LM14 as drought-sensitive)
were exposed to 72 h drought stress at two leaf stage. Alterations in their
antioxidant pools combined with activities of enzymes involved in defense
against oxidative stress were investigated in leaves. Activities of some
reactive oxygen species (ROS)-scavenging enzymes, catalase (CAT) and ascorbate
peroxidase (APX) were enhanced in tolerant genotypes in response to drought
stress. Superoxide dismutase (SOD) activity was significantly decreased in
sensitive genotypes, but remained unchanged in tolerant genotypes under stress.
Peroxidase (POX) activity was significantly induced in tolerant, as well as
sensitive genotypes. Imposition of stress led to increase in H2O2
and malondialdehyde (MDA, a marker for lipid peroxidation) content in sensitive
genotypes, while in tolerant genotypes no change was observed. Significant
increase in glutathione content was observed in sensitive genotypes. Ascorbic
acid pool was induced in both tolerant and sensitive genotypes, but induction
was more pronounced in tolerant genotypes. Significant activation of antioxidative
defence mechanisms correlated with drought-induced oxidative stress tolerance
was the characteristic of the drought tolerant genotypes. These studies provide
a mechanism for drought tolerance in maize seedlings. |
| Page(s): | 47-53 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0959 (Online); 0301-1208 (Print) |
| Source: | IJBB Vol.48(1) [February 2011]
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