Abstract
The objective of this study was to investigate the effect of Selenium (Se) supply (0, 3, 6, 12, 24 mg kg−1) on the growth, photosynthetic characteristics, Se accumulation and distribution of flue-cured tobacco (Nicotiana tabacum L.). Results showed that low-dose Se treatments (≤6 mg kg−1) stimulated plant growth but high-dose Se treatments (≥12 mg kg−1) hindered plant growth. Optimal Se dose (6 mg kg−1) stimulated plant growth by reducing MDA content and improving photosynthetic capability. However, excess Se (24 mg kg−1) increased MDA content by 28%, decreased net photosynthetic rate and carboxylation efficiency by 34% and 39%, respectively. The Se concentration in the roots, stems, and leaves of the tobacco plants significantly increased with increasing Se application. A linear correlation (R = 0.95, P < 0.01) was observed between Se level and tobacco plant tissue Se concentration. This correlation indicated that the tobacco plant tissues were not saturated within the concentration range tested. The pattern of total Se concentration in the tobacco plant tissues followed the order root > leaf > stem. The Se concentration in the roots was 3.17 and 7.57 times higher than that in the leaves and stems, respectively, after treatment with 24 mg kg−1 Se. In conclusion, the present study suggested that optimal Se dose (6 mg kg−1) improved the plant growth mainly by enhancing photosynthesis, stomatal conductance, carboxylation efficiency and Rubisco content in the flue-cured tobacco leaves. However, the inhibition of excess Se on tobacco growth might be due to high accumulation of Se in roots and the damage of photosynthesis in leaves.
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Claims 15
Claim · model-written summary
Low-dose selenium stimulated tobacco growth.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)
Nicotiana tabacumt0 - Treatment
- low-dose Se treatments (≤6 mg kg−1)e0
- Outcome
- plant growthe0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“low-dose Se treatments (≤6 mg kg−1) stimulated plant growth”
Claim · model-written summary
High-dose selenium hindered tobacco growth.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- high-dose Se treatments (≥12 mg kg−1)e0
- Outcome
- plant growthe0
- Direction
- hinderede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“high-dose Se treatments (≥12 mg kg−1) hindered plant growth”
Claim · model-written summary
The 6 mg kg−1 selenium dose reduced MDA content.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- Optimal Se dose (6 mg kg−1)e0
- Outcome
- MDA contente0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“Optimal Se dose (6 mg kg−1) stimulated plant growth by reducing MDA content”
Claim · model-written summary
The 6 mg kg−1 selenium dose improved photosynthetic capability.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- Optimal Se dose (6 mg kg−1)e0
- Outcome
- photosynthetic capabilitye0
- Direction
- improvinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“Optimal Se dose (6 mg kg−1) stimulated plant growth by reducing MDA content and improving photosynthetic capability”
Claim · model-written summary
Excess selenium increased MDA content by 28%.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- excess Se (24 mg kg−1)e0
- Outcome
- MDA contente0
- Direction
- increasede0
- Value
- 28%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“excess Se (24 mg kg−1) increased MDA content by 28%”
Claim · model-written summary
Excess selenium decreased net photosynthetic rate by 34%.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- excess Se (24 mg kg−1)e0
- Outcome
- net photosynthetic ratee0
- Direction
- decreasede0
- Value
- 34%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“excess Se (24 mg kg−1) increased MDA content by 28%, decreased net photosynthetic rate and carboxylation efficiency by 34% and 39%, respectively”
Claim · model-written summary
Excess selenium decreased carboxylation efficiency by 39%.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- excess Se (24 mg kg−1)e0
- Outcome
- carboxylation efficiencye0
- Direction
- decreasede0
- Value
- 39%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“excess Se (24 mg kg−1) increased MDA content by 28%, decreased net photosynthetic rate and carboxylation efficiency by 34% and 39%, respectively”
Claim · model-written summary
Tissue selenium concentration rose with selenium application.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Organ / stage
- roots, stems, and leavese0
- Treatment
- Se applicatione0
- Outcome
- Se concentratione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“The Se concentration in the roots, stems, and leaves of the tobacco plants significantly increased with increasing Se application”
Claim · model-written summary
Selenium level and tobacco tissue selenium concentration had a linear correlation.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- Se levele0
- Outcome
- tobacco plant tissue Se concentratione0
- Value
- R = 0.95e0
- Qualifier
- P < 0.01e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“A linear correlation (R = 0.95, P < 0.01) was observed between Se level and tobacco plant tissue Se concentration”
Claim · model-written summary
Tobacco tissues did not saturate within the tested selenium concentration range.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Outcome
- tobacco plant tissues were not saturatede0
- Qualifier
- within the concentration range testede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“tobacco plant tissues were not saturated within the concentration range tested”
Claim · model-written summary
Total selenium concentration ranked root above leaf above stem.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Outcome
- total Se concentratione0
- Direction
- root > leaf > steme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“total Se concentration in the tobacco plant tissues followed the order root > leaf > stem”
Claim · model-written summary
After 24 mg kg−1 selenium, root selenium concentration was 3.17 times leaf concentration.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Organ / stage
- rootse0
- Treatment
- 24 mg kg−1 See0
- Outcome
- Se concentratione0
- Direction
- highere0
- Value
- 3.17e0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“The Se concentration in the roots was 3.17 and 7.57 times higher than that in the leaves and stems, respectively, after treatment with 24 mg kg−1 Se”
Claim · model-written summary
After 24 mg kg−1 selenium, root selenium concentration was 7.57 times stem concentration.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Organ / stage
- rootse0
- Treatment
- 24 mg kg−1 See0
- Outcome
- Se concentratione0
- Direction
- highere0
- Value
- 7.57e0
- Comparator
- stemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“The Se concentration in the roots was 3.17 and 7.57 times higher than that in the leaves and stems, respectively, after treatment with 24 mg kg−1 Se”
Claim · model-written summary
The authors attribute improved growth at the optimal selenium dose to enhanced photosynthesis, stomatal conductance, carboxylation efficiency and Rubisco content.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- optimal Se dose (6 mg kg−1)e0
- Outcome
- plant growthe0
- Direction
- improvede0
- Qualifier
- enhancing photosynthesis, stomatal conductance, carboxylation efficiency and Rubisco contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“optimal Se dose (6 mg kg−1) improved the plant growth mainly by enhancing photosynthesis, stomatal conductance, carboxylation efficiency and Rubisco content”
Claim · model-written summary
The authors suggest excess selenium inhibits tobacco growth through root selenium accumulation and leaf photosynthetic damage.
- Taxon
- flue-cured tobacco (Nicotiana tabacum L.)Nicotiana tabacumt0
- Treatment
- excess See0
- Outcome
- tobacco growthe0
- Direction
- inhibitione0
- Qualifier
- high accumulation of Se in roots and the damage of photosynthesis in leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e0“the inhibition of excess Se on tobacco growth might be due to high accumulation of Se in roots and the damage of photosynthesis in leaves”
The same questions in other papers
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See all 7 papers →selenium atom · physiology: photosynthesis · Nicotiana tabacum (tobacco)Results agree
4 papers in the same direction as this paper
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See all 5 papers →selenium atom · growth · Nicotiana tabacum (tobacco)Results agree
4 papers in the same direction as this paper
- positive
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See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.