Abstract
The combined effects of enhanced UV-B radiation and soil drought on antioxidant enzyme activity were investigated in cucumber leaves. One-month-old cucumber plants (Cucumis sativus cv. Dar) were exposed to UV-B irradiation and water deficit alone or combined. Physiological measurements were made in seedlings kept under stress conditions for nine days and then two more days with stresses withdrawn. Generally a decrease in relative water content and an increase in dry weight content were recorded. The more significant changes were observed under drought than under UV-B radiation and or combined UV-B and drought. Both stresses stimulated antioxidant enzyme activity. Superoxide dismutase activity increased earlier (day 2) than guaiacol peroxidase and glutathione reductase activity (days 5 and 7). Elevation of enzyme activities was higher under drought than under UV-B. Combined UV-B and drought functioned synergistically: one of the stresses reduced the effects caused by simultaneous application of the other.
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Claims 8
Claim · model-written summary
Stress decreased relative water content.
- Taxon
- cucumber
Cucumis sativust0 - Outcome
- relative water contente0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER”
e0“Generally a decrease in relative water content and an increase in dry weight content were recorded”
Claim · model-written summary
Stress increased dry weight content.
- Taxon
- cucumberCucumis sativust0
- Outcome
- dry weight contente0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER”
e0“Generally a decrease in relative water content and an increase in dry weight content were recorded”
Claim · model-written summary
Changes were greater under drought than UV-B or the combined stresses.
- Taxon
- cucumberCucumis sativust0
- Treatment
- droughte0
- Outcome
- changese0
- Direction
- more significante0
- Comparator
- UV-B radiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER”
e0“The more significant changes were observed under drought than under UV-B radiation and or combined UV-B and drought”
Claim · model-written summary
Both stresses stimulated antioxidant enzyme activity.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Both stressese0
- Outcome
- antioxidant enzyme activitye0
- Direction
- stimulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER”
e0“Both stresses stimulated antioxidant enzyme activity”
Claim · model-written summary
Superoxide dismutase activity increased by day 2, before the other two enzymes.
- Taxon
- cucumberCucumis sativust0
- Gene
- Superoxide dismutasee0
- Outcome
- Superoxide dismutase activitye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER”
e0“Superoxide dismutase activity increased earlier (day 2) than guaiacol peroxidase and glutathione reductase activity (days 5 and 7)”
Claim · model-written summary
Guaiacol peroxidase and glutathione reductase activity increased on days 5 and 7.
- Taxon
- cucumberCucumis sativust0
- Gene
- guaiacol peroxidasee0
- Outcome
- guaiacol peroxidase and glutathione reductase activitye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER”
e0“Superoxide dismutase activity increased earlier (day 2) than guaiacol peroxidase and glutathione reductase activity (days 5 and 7)”
Claim · model-written summary
Enzyme activity elevation was higher under drought than UV-B.
- Taxon
- cucumberCucumis sativust0
- Treatment
- droughte0
- Outcome
- enzyme activitiese0
- Direction
- highere0
- Comparator
- UV-Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER”
e0“Elevation of enzyme activities was higher under drought than under UV-B”
Claim · model-written summary
Combined UV-B and drought were described as synergistic, with each reducing the other’s effect.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Combined UV-B and droughte0
- Outcome
- effectse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER”
e0“Combined UV-B and drought functioned synergistically: one of the stresses reduced the effects caused by simultaneous application of the other”