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.
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Claims 10
Claim · model-written summary
Drought increased CAT and APX activities in tolerant maize genotypes.
- Material
- tolerant genotypese0
- Treatment
- drought stresse0
- Outcome
- catalase (CAT) and ascorbate peroxidase (APX)e0
- Direction
- enhancede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“maize (Zea mays L.)”
Claim · model-written summary
Drought significantly decreased SOD activity in sensitive genotypes.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase (SOD) activity was significantly decreased in sensitive genotypes”
t0“maize (Zea mays L.)”
Claim · model-written summary
SOD activity remained unchanged under stress in tolerant genotypes.
- Material
- tolerant genotypese0
- Treatment
- stresse0
- Outcome
- Superoxide dismutase (SOD) activitye0
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase (SOD) activity was significantly decreased in sensitive genotypes, but remained unchanged in tolerant genotypes under stress”
t0“maize (Zea mays L.)”
Claim · model-written summary
Drought significantly induced POX activity in both tolerant and sensitive genotypes.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peroxidase (POX) activity was significantly induced in tolerant, as well as sensitive genotypes”
t0“maize (Zea mays L.)”
Claim · model-written summary
Stress increased H2O2 content in sensitive genotypes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Imposition of stress led to increase in H2O2 and malondialdehyde (MDA, a marker for lipid peroxidation) content in sensitive genotypes”
t0“maize (Zea mays L.)”
Claim · model-written summary
Stress increased MDA content in sensitive genotypes.
- Material
- sensitive genotypese0
- Treatment
- stresse0
- Outcome
- malondialdehyde (MDA, a marker for lipid peroxidation) contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Imposition of stress led to increase in H2O2 and malondialdehyde (MDA, a marker for lipid peroxidation) content in sensitive genotypes”
t0“maize (Zea mays L.)”
Claim · model-written summary
Stress caused no observed H2O2 or MDA change in tolerant genotypes.
- Material
- tolerant genotypese0
- Treatment
- stresse0
- Outcome
- H2O2 and malondialdehyde (MDA, a marker for lipid peroxidation) contente0
- Direction
- no changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“maize (Zea mays L.)”
Claim · model-written summary
Glutathione content increased significantly in sensitive genotypes.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant increase in glutathione content was observed in sensitive genotypes”
t0“maize (Zea mays L.)”
Claim · model-written summary
Ascorbic acid pool increased in both tolerance groups, more strongly in tolerant genotypes.
- Material
- tolerant genotypese0
- Outcome
- Ascorbic acid poole0
- Direction
- inducede0
- Comparator
- sensitive genotypese0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ascorbic acid pool was induced in both tolerant and sensitive genotypes, but induction was more pronounced in tolerant genotypes”
t0“maize (Zea mays L.)”
Claim · model-written summary
Antioxidative defence activation correlated with drought tolerance in tolerant genotypes.
- Material
- drought tolerant genotypese0
- Outcome
- drought-induced oxidative stress tolerancee0
- Qualifier
- Significant activation of antioxidative defence mechanismse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant activation of antioxidative defence mechanisms correlated with drought-induced oxidative stress tolerance was the characteristic of the drought tolerant genotypes”
t0“maize (Zea mays L.)”