Abstract
Introduction This study investigated the combined effects of molybdenum (Mo) and nitrogen (N) fertilization on N metabolism and amino acid content in the leaves of flue-cured tobacco ( Nicotiana tabacum L. ) during its mature stage through a pot experiment. Methods Different application levels of Mo (0, 0.15, 0.30 mg/kg soil) and N (0.06, 0.24, 0.42 g/kg soil) were set to observe and analyze changes in leaf quality, N, and amino acid content in the tobacco plants. Results The results revealed that the N fertilizer application level exhibited a primary effect on regulating the total nitrogen, nitrate nitrogen, soluble protein, and amino acid nitrogen concentrations within tobacco leaves, while the effectiveness of Mo fertilization was influenced by the level of N applied. Specifically, under the conditions of 0.24 g/kg soil N and 0.30 mg/kg soil Mo application, the N content, N accumulation, and dry matter mass of the tobacco plants increased significantly by 110%, 204%, and 48%, respectively. Concurrently, nitrate reductase activity increased by 107-fold, and the nitrate nitrogen content was relatively low, contributing to enhanced tobacco yield and safety. Moreover, this treatment led to a notable (170%) increase in free amino acid nitrogen content, with minimal impact on total amino acids and soluble proteins. Notably, it effectively increased the content of free amino acids beneficial to the sensory quality of tobacco (such as histidine, arginine, aspartic acid, isoleucine, and glutamic acid) without reducing the total amino acid content, while simultaneously reducing other amino acids that might affect quality. Therefore, the combined application of 0.30 mg/kg soil Mo and 0.24 g/kg soil N specifically optimized the amino acid composition in tobacco leaves, positively impacting overall quality and market competitiveness. Discussion This study provides a theoretical basis for the rational application of Mo fertilizer in Mo-deficient areas to improve the yield and quality of flue-cured tobacco.
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Claims 12
Claim · model-written summary
Nitrogen fertilizer primarily regulated total nitrogen, nitrate nitrogen, soluble protein and amino acid nitrogen in tobacco leaves.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- N fertilizer application levele0
- Outcome
- total nitrogen, nitrate nitrogen, soluble protein, and amino acid nitrogen concentrationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the N fertilizer application level exhibited a primary effect on regulating the total nitrogen, nitrate nitrogen, soluble protein, and amino acid nitrogen concentrations within tobacco leaves”
t0“tobacco”
Claim · model-written summary
The effect of Mo fertilization depended on the applied N level.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- Mo fertilizatione0
- Outcome
- effectivenesse0
- Qualifier
- level of N appliede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effectiveness of Mo fertilization was influenced by the level of N applied”
t0“tobacco”
Claim · model-written summary
At 0.24 g/kg soil N and 0.30 mg/kg soil Mo, tobacco N content increased 110%.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- 0.24 g/kg soil N and 0.30 mg/kg soil Mo applicatione0
- Outcome
- N contente0
- Direction
- increasede0
- Value
- 110%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the conditions of 0.24 g/kg soil N and 0.30 mg/kg soil Mo application, the N content, N accumulation, and dry matter mass of the tobacco plants increased significantly by 110%, 204%, and 48%, respectively”
t0“tobacco”
Claim · model-written summary
At the same fertilizer rates, N accumulation increased 204%.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- 0.24 g/kg soil N and 0.30 mg/kg soil Mo applicatione0
- Outcome
- N accumulatione0
- Direction
- increasede0
- Value
- 204%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the conditions of 0.24 g/kg soil N and 0.30 mg/kg soil Mo application, the N content, N accumulation, and dry matter mass of the tobacco plants increased significantly by 110%, 204%, and 48%, respectively”
t0“tobacco”
Claim · model-written summary
At the same fertilizer rates, tobacco dry matter mass increased 48%.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- 0.24 g/kg soil N and 0.30 mg/kg soil Mo applicatione0
- Outcome
- dry matter masse0
- Direction
- increasede0
- Value
- 48%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the conditions of 0.24 g/kg soil N and 0.30 mg/kg soil Mo application, the N content, N accumulation, and dry matter mass of the tobacco plants increased significantly by 110%, 204%, and 48%, respectively”
t0“tobacco”
Claim · model-written summary
Nitrate reductase activity increased 107-fold under this treatment.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- nitrate reductase activitye0
- Direction
- increasede0
- Value
- 107-folde0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate reductase activity increased by 107-fold”
t0“tobacco”
Claim · model-written summary
Nitrate nitrogen content was relatively low under this treatment.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- nitrate nitrogen contente0
- Direction
- relatively lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the nitrate nitrogen content was relatively low”
t0“tobacco”
Claim · model-written summary
Free amino acid nitrogen content increased 170% under this treatment.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- this treatmente0
- Outcome
- free amino acid nitrogen contente0
- Direction
- increasee0
- Value
- 170%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this treatment led to a notable (170%) increase in free amino acid nitrogen content”
t0“tobacco”
Claim · model-written summary
Total amino acids and soluble proteins changed minimally.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- total amino acids and soluble proteinse0
- Direction
- minimal impacte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with minimal impact on total amino acids and soluble proteins”
t0“tobacco”
Claim · model-written summary
This treatment increased several free amino acids beneficial to tobacco sensory quality.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- content of free amino acids beneficial to the sensory quality of tobaccoe0
- Direction
- increasede0
- Qualifier
- histidine, arginine, aspartic acid, isoleucine, and glutamic acide0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it effectively increased the content of free amino acids beneficial to the sensory quality of tobacco (such as histidine, arginine, aspartic acid, isoleucine, and glutamic acid)”
t0“tobacco”
Claim · model-written summary
Other amino acids that might affect quality were reduced.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- other amino acids that might affect qualitye0
- Direction
- reducinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while simultaneously reducing other amino acids that might affect quality”
t0“tobacco”
Claim · model-written summary
Combined Mo and N application optimized tobacco leaf amino acid composition and quality.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- combined application of 0.30 mg/kg soil Mo and 0.24 g/kg soil Ne0
- Outcome
- optimized the amino acid composition in tobacco leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the combined application of 0.30 mg/kg soil Mo and 0.24 g/kg soil N specifically optimized the amino acid composition in tobacco leaves, positively impacting overall quality and market competitiveness”
t0“tobacco”
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See all 13 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.