Abstract
Hydroponic experiments were conducted using cadmium (Cd)-sensitive (cv Guiyan 1) and Cd-tolerant (Yunyan 2) tobacco cultivars to evaluate cultivar differences in response to Cd toxicity in the presence of selenium (Se). The results showed that addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition, and increased nitrogen and chlorophyll contents as well as photosynthetic performance (i.e., net photosynthetic rate, stomatal conductance, and transpiration rate). External Se dramatically depressed Cd-induced O2 (•-) , H2 O2 , and malondialdehyde accumulation, especially in the sensitive cultivar. Selenium significantly elevated Cd-depressed activities of superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, glutathione-peroxidase, and glutathione reductase in the both cultivars after 7-d treatments. Meanwhile, Se counteracted Cd-induced alterations in certain nutrient elements; for example, it significantly increased Zn and Ca concentrations and reduced Mg concentration in both cultivars. Furthermore, Se significantly elevated Cd-depressed H(+) -K(+) -adenosine triphosphatase (ATPase), Na(+) -K(+) -ATPase, and Ca(2+) -Mg(2+) -ATPase activities. The beneficial effect of Se under Cd stress may be related mainly to the increased ATPase activity and reduced Cd uptake and reactive oxygen species accumulation, thus reducing the negative consequences of oxidative stress caused by Cd toxicity.
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Claims 11
Claim · model-written summary
Adding 3 µM Se to 50 µM Cd solution markedly reduced Cd accumulation in tobacco plants.
- Taxon
- tobacco
Nicotiana tabacumt0 - Material
- cv Guiyan 1e0
- Treatment
- addition of 3 µM See1
- Outcome
- Cd accumulation in plantse1
- Direction
- reducede1
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e0“Hydroponic experiments were conducted using cadmium (Cd)-sensitive (cv Guiyan 1) and Cd-tolerant (Yunyan 2) tobacco cultivars”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
Claim · model-written summary
Selenium alleviated Cd-induced growth inhibition in tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- addition of 3 µM See1
- Outcome
- Cd-induced growth inhibitione1
- Direction
- alleviatede1
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
Claim · model-written summary
Selenium increased nitrogen and chlorophyll contents in Cd-stressed tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- addition of 3 µM See1
- Outcome
- nitrogen and chlorophyll contentse2
- Direction
- increasede2
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
e2“increased nitrogen and chlorophyll contents as well as photosynthetic performance (i.e., net photosynthetic rate, stomatal conductance, and transpiration rate)”
Claim · model-written summary
Selenium increased photosynthetic performance (net photosynthetic rate, stomatal conductance and transpiration rate) in Cd-stressed tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- addition of 3 µM See1
- Outcome
- photosynthetic performancee2
- Direction
- increasede2
- Qualifier
- net photosynthetic rate, stomatal conductance, and transpiration ratee2
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
e2“increased nitrogen and chlorophyll contents as well as photosynthetic performance (i.e., net photosynthetic rate, stomatal conductance, and transpiration rate)”
Claim · model-written summary
External Se depressed Cd-induced H2O2 and malondialdehyde accumulation in tobacco, especially in the sensitive cultivar.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- External See3
- Outcome
- H2 O2 , and malondialdehyde accumulatione3
- Direction
- depressede3
- Qualifier
- especially in the sensitive cultivare3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e3“External Se dramatically depressed Cd-induced O2 (•-) , H2 O2 , and malondialdehyde accumulation, especially in the sensitive cultivar”
Claim · model-written summary
Selenium elevated Cd-depressed activities of superoxide dismutase, peroxidase and catalase in both tobacco cultivars.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- Seleniume4
- Gene
- superoxide dismutase, peroxidase, catalasee4
- Outcome
- activitiese4
- Direction
- elevatede4
- Qualifier
- after 7-d treatmentse4
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
e4“Selenium significantly elevated Cd-depressed activities of superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, glutathione-peroxidase, and glutathione reductase in the both cultivars after 7-d treatments”
Claim · model-written summary
Selenium elevated Cd-depressed activities of ascorbate peroxidase, glutathione peroxidase and glutathione reductase in both tobacco cultivars.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- Seleniume4
- Gene
- ascorbate peroxidase, glutathione-peroxidase, and glutathione reductasee4
- Outcome
- ascorbate peroxidase, glutathione-peroxidase, and glutathione reductasee4
- Direction
- elevatede4
- Qualifier
- after 7-d treatmentse4
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
e4“Selenium significantly elevated Cd-depressed activities of superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, glutathione-peroxidase, and glutathione reductase in the both cultivars after 7-d treatments”
Claim · model-written summary
Selenium increased Zn and Ca concentrations in Cd-stressed tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- addition of 3 µM See1
- Outcome
- Zn and Ca concentrationse5
- Direction
- increasede5
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
e5“it significantly increased Zn and Ca concentrations and reduced Mg concentration in both cultivars”
Claim · model-written summary
Selenium reduced Mg concentration in Cd-stressed tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- addition of 3 µM See1
- Outcome
- Mg concentratione5
- Direction
- reducede5
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
e5“it significantly increased Zn and Ca concentrations and reduced Mg concentration in both cultivars”
Claim · model-written summary
Selenium elevated Cd-depressed ATPase activities in tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- See6
- Gene
- H(+) -K(+) -adenosine triphosphatase (ATPase), Na(+) -K(+) -ATPase, and Ca(2+) -Mg(2+) -ATPasee6
- Outcome
- ATPase activitiese6
- Direction
- elevatede6
- Comparator
- 50 µM Cd solutione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e1“addition of 3 µM Se in 50 µM Cd solution markedly reduced Cd accumulation in plants, alleviated Cd-induced growth inhibition”
e6“Se significantly elevated Cd-depressed H(+) -K(+) -adenosine triphosphatase (ATPase), Na(+) -K(+) -ATPase, and Ca(2+) -Mg(2+) -ATPase activities”
Claim · model-written summary
The beneficial effect of Se under Cd stress may be related to increased ATPase activity and reduced Cd uptake and reactive oxygen species accumulation (hypothesis).
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- See7
- Outcome
- beneficial effect of Se under Cd stresse7
- Qualifier
- increased ATPase activity and reduced Cd uptake and reactive oxygen species accumulatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“2 tobacco genotypes”
e7“The beneficial effect of Se under Cd stress may be related mainly to the increased ATPase activity and reduced Cd uptake and reactive oxygen species accumulation”
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