Abstract
As a main nutritive element of tobacco, nitrogen not only plays an important role in protection against light stress, but also impacts on the balance of carbonnitrogen metabolism. The combination of proper light intensity and nitrogen application could improve the utilization of light energy and increase the amount of dry matter accumulation in fluecured tobacco. The objectives of this study were to reveal the interaction effects of light intensity and nitrogen application on gas exchange parameters, some enzyme activities in carbonnitrogen metabolism and chemical composition and to investigate the optimum combination of light and nitrogen in tobacco growth. Fluecured tobacco Yuyan 5 was used in a pot experiment in 2008, with the treatments of light intensity (four levels) and nitrogen supply (three treatments). The results indicated that the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and the amount of dry matter accumulation reduced under shading, but the intercellular CO2 concentration (Ci) increased. Light, nitrogen and their interactions had a significant influence on photosynthetic physiology indicators of fluecured tobacco. The decline in photosynthetic rate caused by shading could be effectively improved by appropriate application of nitrogen so that the photosynthetic capability and the dry matter accumulation of tobacco could be promoted, but overapplication of nitrogen had a negative influence on photosynthetic efficiency. With increasing the rate of nitrogen, the activity of nitrate reductase increased and reached the maximum at 40 days after transplant for N1, N2, and 60 days after transplant for N3, showing that the nitrogen metabolism was postponed. The results also showed that the contents of total nitrogen and nicotine increased with increasing the rate of shading and nitrogen, but the content of carbohydrate reduced. Generally, the nitrogen metabolism was likely stronger than the carbon metabolism. Light, nitrogen and their interactions had a significant influence on fluecured tobacco. The combination of 70% of natural light intensity and proper application of nitrogen (N2, 3.5 g per pot in this experiment) could improve the photosynthetic capability and the balance of carbonnitrogen metabolism, and increase the amount of dry matter accumulation and the quality in fluecured tobacco.
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Claims 14
Claim · model-written summary
Shading reduced photosynthetic rate, transpiration, and stomatal conductance.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- shadinge0
- Outcome
- net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicated that the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and the amount of dry matter accumulation reduced under shading, but the intercellular CO2 concentration (Ci) increased.”
t0“tobacco”
Claim · model-written summary
Shading reduced dry matter accumulation.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- shadinge0
- Outcome
- amount of dry matter accumulatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicated that the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and the amount of dry matter accumulation reduced under shading, but the intercellular CO2 concentration (Ci) increased.”
t0“tobacco”
Claim · model-written summary
Shading increased intercellular CO2 concentration.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- shadinge0
- Outcome
- intercellular CO2 concentration (Ci)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicated that the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and the amount of dry matter accumulation reduced under shading, but the intercellular CO2 concentration (Ci) increased.”
t0“tobacco”
Claim · model-written summary
Light, nitrogen, and their interaction significantly influenced tobacco photosynthetic indicators.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Light, nitrogen and their interactionse0
- Outcome
- photosynthetic physiology indicatorse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light, nitrogen and their interactions had a significant influence on photosynthetic physiology indicators of fluecured tobacco.”
Claim · model-written summary
Appropriate nitrogen application improved shaded tobacco photosynthetic rate.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- appropriate application of nitrogene0
- Outcome
- photosynthetic ratee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline in photosynthetic rate caused by shading could be effectively improved by appropriate application of nitrogen so that the photosynthetic capability and the dry matter accumulation of tobacco could be promoted, but overapplication of nitrogen had a negative influence on photosynthetic efficiency.”
Claim · model-written summary
Appropriate nitrogen promoted dry matter accumulation under shade.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- appropriate application of nitrogene0
- Outcome
- dry matter accumulatione0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline in photosynthetic rate caused by shading could be effectively improved by appropriate application of nitrogen so that the photosynthetic capability and the dry matter accumulation of tobacco could be promoted, but overapplication of nitrogen had a negative influence on photosynthetic efficiency.”
Claim · model-written summary
Excess nitrogen negatively affected photosynthetic efficiency.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- overapplication of nitrogene0
- Outcome
- photosynthetic efficiencye0
- Direction
- negative influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline in photosynthetic rate caused by shading could be effectively improved by appropriate application of nitrogen so that the photosynthetic capability and the dry matter accumulation of tobacco could be promoted, but overapplication of nitrogen had a negative influence on photosynthetic efficiency.”
t0“tobacco”
Claim · model-written summary
Nitrate reductase activity increased as nitrogen rate increased.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- increasing the rate of nitrogene0
- Gene
- nitrate reductasee0
- Outcome
- activity of nitrate reductasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing the rate of nitrogen, the activity of nitrate reductase increased and reached the maximum at 40 days after transplant for N1, N2, and 60 days after transplant for N3, showing that the nitrogen metabolism was postponed.”
t0“tobacco”
Claim · model-written summary
Nitrate reductase activity peaked 40 days after transplant for N1 and N2.
- Taxon
- tobaccoNicotiana tabacumt0
- Gene
- nitrate reductasee0
- Outcome
- activity of nitrate reductasee0
- Value
- 40 days after transplante0
- Qualifier
- N1, N2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing the rate of nitrogen, the activity of nitrate reductase increased and reached the maximum at 40 days after transplant for N1, N2, and 60 days after transplant for N3, showing that the nitrogen metabolism was postponed.”
t0“tobacco”
Claim · model-written summary
Nitrate reductase activity peaked 60 days after transplant for N3.
- Taxon
- tobaccoNicotiana tabacumt0
- Gene
- nitrate reductasee0
- Outcome
- activity of nitrate reductasee0
- Value
- 60 days after transplante0
- Qualifier
- N3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing the rate of nitrogen, the activity of nitrate reductase increased and reached the maximum at 40 days after transplant for N1, N2, and 60 days after transplant for N3, showing that the nitrogen metabolism was postponed.”
t0“tobacco”
Claim · model-written summary
Increasing shade and nitrogen increased total nitrogen and nicotine contents.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- increasing the rate of shading and nitrogene0
- Outcome
- contents of total nitrogen and nicotinee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results also showed that the contents of total nitrogen and nicotine increased with increasing the rate of shading and nitrogen, but the content of carbohydrate reduced.”
t0“tobacco”
Claim · model-written summary
Increasing shade and nitrogen reduced carbohydrate content.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- increasing the rate of shading and nitrogene0
- Outcome
- content of carbohydratee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results also showed that the contents of total nitrogen and nicotine increased with increasing the rate of shading and nitrogen, but the content of carbohydrate reduced.”
t0“tobacco”
Claim · model-written summary
The authors identified 70% natural light and N2 nitrogen as a favorable combination for photosynthesis and carbon–nitrogen balance.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- 70% of natural light intensity and proper application of nitrogen (N2, 3.5 g per pot in this experiment)e0
- Outcome
- improve the photosynthetic capability and the balance of carbonnitrogen metabolisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of 70% of natural light intensity and proper application of nitrogen (N2, 3.5 g per pot in this experiment) could improve the photosynthetic capability and the balance of carbonnitrogen metabolism, and increase the amount of dry matter accumulation and the quality in fluecured tobacco.”
Claim · model-written summary
The authors identified the combination as increasing dry matter and quality.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- 70% of natural light intensity and proper application of nitrogen (N2, 3.5 g per pot in this experiment)e0
- Outcome
- increase the amount of dry matter accumulation and the qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of 70% of natural light intensity and proper application of nitrogen (N2, 3.5 g per pot in this experiment) could improve the photosynthetic capability and the balance of carbonnitrogen metabolism, and increase the amount of dry matter accumulation and the quality in fluecured tobacco.”
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