Abstract
The present study was conducted to present the responses of drought-sensitive ‘Shemal’ and drought-tolerant ‘71MAY69’ maize cultivars under drought condition (20% Polyethylene glycol, -0.40 MPa) and three different copper concentrations (0.5 mM, 1 mM, 1.5 mM CuSO4.5H2O) for 5 days to determine the enzymatic responses of copper treatment in maize leaves.Copper treatments alone did not change stomatal conductance, relative water content, malondialdehyde, proline, hydrogen peroxide content and abscisic acid level according to control groups. Combined treatment (drought and copper) alleviated the damage of PEG- induced drought stress in maize leaves. Superoxide dismutase (SOD), catalase (CAT), glutatione reductase (GR) activity increased and glutathione -S transferase (GST) activity decreased, while ascorbate peroxidase (APX) activity didnot change under drought stress in the tolerant cultivar. SOD, CAT and APX were decreased and GST activities were increased while GR did not change in ‘Shemal’. Also SOD, APX and CAT activity increased by copper treatment alone in both cultivars. Otherwise combined treatment increased SOD, APX and CAT activity at all concentrations, but GR and GST activity increased only by (PEG+1.5 mM) treatment when compared with PEG treatment alone in sensitive ones. As a result, exogenous copper alleviated drought stress, while it induced an oxidative damage by increasing antioxidant enzyme activities differently from drought tolerance. Copper tolerance in maize is not a common response of its defense mechanism because of different response to copper and drought in the same cultivar.
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Claims 12
Claim · model-written summary
Copper treatment alone did not change stomatal conductance, relative water content or malondialdehyde in maize relative to controls
- Treatment
- Copper treatments alonee1
- Outcome
- stomatal conductance, relative water content, malondialdehydee1
- Direction
- did not changee1
- Comparator
- control groupse1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e1“Copper treatments alone did not change stomatal conductance, relative water content, malondialdehyde, proline, hydrogen peroxide content and abscisic acid level according to control groups”
Claim · model-written summary
Copper treatment alone did not change proline, hydrogen peroxide or abscisic acid level in maize relative to controls
- Treatment
- Copper treatments alonee1
- Outcome
- proline, hydrogen peroxide content and abscisic acid levele1
- Direction
- did not changee1
- Comparator
- control groupse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e1“Copper treatments alone did not change stomatal conductance, relative water content, malondialdehyde, proline, hydrogen peroxide content and abscisic acid level according to control groups”
Claim · model-written summary
Combined drought and copper treatment alleviated the damage of PEG-induced drought stress in maize leaves
- Treatment
- Combined treatment (drought and copper)e2
- Outcome
- damagee2
- Direction
- alleviatede2
- Comparator
- PEG- induced drought stresse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e2“Combined treatment (drought and copper) alleviated the damage of PEG- induced drought stress in maize leaves”
Claim · model-written summary
Drought stress increased SOD, CAT and GR activity in the tolerant maize cultivar 71MAY69
- Material
- 71MAY69e0
- Treatment
- drought stresse3
- Outcome
- Superoxide dismutase (SOD), catalase (CAT), glutatione reductase (GR) activitye3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e0“drought-tolerant ‘71MAY69’ maize cultivars under drought condition (20% Polyethylene glycol, -0.40 MPa)”
e3“Superoxide dismutase (SOD), catalase (CAT), glutatione reductase (GR) activity increased and glutathione -S transferase (GST) activity decreased, while ascorbate peroxidase (APX) activity didnot change under drought stress in the tolerant cultivar”
Claim · model-written summary
Drought stress decreased glutathione S-transferase activity in the tolerant maize cultivar 71MAY69
- Material
- 71MAY69e0
- Treatment
- drought stresse3
- Outcome
- glutathione -S transferase (GST) activitye3
- Direction
- decreasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e0“drought-tolerant ‘71MAY69’ maize cultivars under drought condition (20% Polyethylene glycol, -0.40 MPa)”
e3“Superoxide dismutase (SOD), catalase (CAT), glutatione reductase (GR) activity increased and glutathione -S transferase (GST) activity decreased, while ascorbate peroxidase (APX) activity didnot change under drought stress in the tolerant cultivar”
Claim · model-written summary
Drought stress did not change ascorbate peroxidase activity in the tolerant maize cultivar 71MAY69
- Material
- 71MAY69e0
- Treatment
- drought stresse3
- Outcome
- ascorbate peroxidase (APX) activitye3
- Direction
- didnot changee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e0“drought-tolerant ‘71MAY69’ maize cultivars under drought condition (20% Polyethylene glycol, -0.40 MPa)”
e3“Superoxide dismutase (SOD), catalase (CAT), glutatione reductase (GR) activity increased and glutathione -S transferase (GST) activity decreased, while ascorbate peroxidase (APX) activity didnot change under drought stress in the tolerant cultivar”
Claim · model-written summary
Drought condition decreased SOD, CAT and APX activity in the sensitive maize cultivar Shemal
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e0“drought-tolerant ‘71MAY69’ maize cultivars under drought condition (20% Polyethylene glycol, -0.40 MPa)”
e4“SOD, CAT and APX were decreased and GST activities were increased while GR did not change in ‘Shemal’”
Claim · model-written summary
Drought condition increased GST activity in the sensitive maize cultivar Shemal
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e0“drought-tolerant ‘71MAY69’ maize cultivars under drought condition (20% Polyethylene glycol, -0.40 MPa)”
e4“SOD, CAT and APX were decreased and GST activities were increased while GR did not change in ‘Shemal’”
Claim · model-written summary
Drought condition did not change GR activity in the sensitive maize cultivar Shemal
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e0“drought-tolerant ‘71MAY69’ maize cultivars under drought condition (20% Polyethylene glycol, -0.40 MPa)”
e4“SOD, CAT and APX were decreased and GST activities were increased while GR did not change in ‘Shemal’”
Claim · model-written summary
Copper treatment alone increased SOD, APX and CAT activity in both maize cultivars
- Material
- both cultivarse5
- Treatment
- copper treatment alonee5
- Outcome
- SOD, APX and CAT activitye5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e5“Also SOD, APX and CAT activity increased by copper treatment alone in both cultivars”
Claim · model-written summary
Combined treatment increased SOD, APX and CAT activity at all copper concentrations relative to PEG alone
- Treatment
- combined treatmente6
- Outcome
- SOD, APX and CAT activitye6
- Direction
- increasede6
- Qualifier
- at all concentrationse6
- Comparator
- PEG treatment alonee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e6“Otherwise combined treatment increased SOD, APX and CAT activity at all concentrations, but GR and GST activity increased only by (PEG+1.5 mM) treatment when compared with PEG treatment alone in sensitive ones”
Claim · model-written summary
Combined treatment increased GR and GST activity only at PEG plus 1.5 mM copper in the sensitive cultivar
- Material
- sensitive onese6
- Treatment
- (PEG+1.5 mM) treatmente6
- Outcome
- GR and GST activitye6
- Direction
- increasede6
- Comparator
- PEG treatment alonee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea mays L.)”
e6“Otherwise combined treatment increased SOD, APX and CAT activity at all concentrations, but GR and GST activity increased only by (PEG+1.5 mM) treatment when compared with PEG treatment alone in sensitive ones”
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