Abstract
This paper reports the effects of selenium (Se) application on some physiological characteristics of barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress. Foliar application to barley at 30 g selenium ha-1, as sodium selenate, increased significantly shoot dry weight and relative water content in well-watered plants. A remarkable reduction in dry weight of water-stressed plants was associated with significant decrease in maximal efficiency of PSII (Fv/Fm), stomatal conductance (gs) and net CO2 assimilation rate (A). Activity of antioxidant enzymes was increased by drought stress significantly. Amounts of malondialdehyde (MDA) and hydrogen peroxide (H2O2) remained unchanged in Se-supplemented water-deficit plants obviously because of an efficient scavenging following significant enhancement of catalase (CAT) and glutathione peroxidase (GSH-Px) activities. These results indicate that an application of selenium was favorable for biomass accumulation of barley plants under well-watered conditions. However, it did not significantly affect dry matter accumulation under drought stress, but Se-supplemented water-deficit plants exhibited better protection from oxidative damage because of higher CAT and GSH-Px activities and lower level of lipid peroxidation. These results suggest that selenium application can improve antioxidant defense system under drought stress conditions, and it may be recommended for arid and semiarid regions.
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Claims 9
Claim · model-written summary
Foliar selenium at 30 g ha-1 increased shoot dry weight and relative water content in well-watered barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Material
- Rihane-03e0
- Treatment
- Foliar application to barley at 30 g selenium ha-1, as sodium selenatee1
- Outcome
- shoot dry weight and relative water contente1
- Direction
- increasede1
- Qualifier
- in well-watered plantse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e1“Foliar application to barley at 30 g selenium ha-1, as sodium selenate, increased significantly shoot dry weight and relative water content in well-watered plants”
Claim · model-written summary
Drought stress decreased maximal PSII efficiency, stomatal conductance and net CO2 assimilation rate in barley.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- drought stresse0
- Outcome
- maximal efficiency of PSII (Fv/Fm), stomatal conductance (gs) and net CO2 assimilation rate (A)e2
- Direction
- significant decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e2“A remarkable reduction in dry weight of water-stressed plants was associated with significant decrease in maximal efficiency of PSII (Fv/Fm), stomatal conductance (gs) and net CO2 assimilation rate (A)”
Claim · model-written summary
Water stress reduced barley dry weight.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- water-stressed plantse2
- Outcome
- dry weighte2
- Direction
- reductione2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e2“A remarkable reduction in dry weight of water-stressed plants was associated with significant decrease in maximal efficiency of PSII (Fv/Fm), stomatal conductance (gs) and net CO2 assimilation rate (A)”
Claim · model-written summary
Drought stress increased antioxidant enzyme activity in barley.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- drought stresse3
- Outcome
- Activity of antioxidant enzymese3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e3“Activity of antioxidant enzymes was increased by drought stress significantly”
Claim · model-written summary
Selenium-supplemented water-deficit barley kept malondialdehyde and hydrogen peroxide contents unchanged.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- Se-supplemented water-deficit plantse4
- Outcome
- malondialdehyde (MDA) and hydrogen peroxide (H2O2)e4
- Direction
- remained unchangede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e4“Amounts of malondialdehyde (MDA) and hydrogen peroxide (H2O2) remained unchanged in Se-supplemented water-deficit plants”
Claim · model-written summary
Selenium-supplemented water-deficit barley showed significantly enhanced catalase and glutathione peroxidase activities.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- catalase (CAT) and glutathione peroxidase (GSH-Px) activitiese5
- Direction
- enhancemente5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e5“following significant enhancement of catalase (CAT) and glutathione peroxidase (GSH-Px) activities”
Claim · model-written summary
Selenium-supplemented water-deficit barley showed better protection from oxidative damage.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- Se-supplementede6
- Outcome
- protection from oxidative damagee6
- Direction
- bettere6
- Qualifier
- because of higher CAT and GSH-Px activitiese6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e6“Se-supplemented water-deficit plants exhibited better protection from oxidative damage because of higher CAT and GSH-Px activities and lower level of lipid peroxidation”
Claim · model-written summary
Selenium did not significantly affect dry matter accumulation of barley under drought stress.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- dry matter accumulatione7
- Qualifier
- under drought stresse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e7“it did not significantly affect dry matter accumulation under drought stress”
Claim · model-written summary
Selenium application is recommended for arid and semiarid regions.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- recommended for arid and semiarid regionse1
- Setting
- arid and semiarid regionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Rihane-03) exposed to drought stress”
e1“it may be recommended for arid and semiarid regions”
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