Abstract
Tobacco-specific nitrosamines (TSNAs) are harmful carcinogens, with nitrate as a precursor of their formation. Nitrate content is considerably higher in burley tobacco than in flue-cured tobacco, but little has been reported on the differences between types of nitrate accumulation during development. We explored nitrate accumulation prior to harvest and examined the effects of regulatory substances aimed at decreasing nitrate and TSNA accumulation. In growth experiments, nitrate accumulation in burley and flue-cured tobacco initially increased but then declined with the highest nitrate content observed during a fast-growth period. When treating tobacco crops with molybdenum (Mo) during fast growth, nitrate reductase activity in burley tobacco increased significantly, but the NO 3 -N content decreased. These treatments also yielded significant reductions in NO 3 -N and TSNA contents. Therefore, we suggest that treatment with Mo during the fast-growth period and a Mo-Gfo (Mo-glufosinate) combination at the maturity stage is an effective strategy for decreasing nitrate and TSNAs during cultivation.
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Claims 5
Claim · model-written summary
Nitrate accumulation in both tobacco types rose and then fell, peaking in fast growth.
- Taxon
- tobacco
Nicotiana tabacume0 - Material
- burley and flue-cured tobaccoe0
- Organ / stage
- fast-growth periode0
- Outcome
- nitrate accumulatione0
- Direction
- increased but then declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate accumulation in burley and flue-cured tobacco initially increased but then declined with the highest nitrate content observed during a fast-growth period”
Claim · model-written summary
Molybdenum treatment during fast growth significantly increased nitrate reductase activity in burley tobacco.
- Taxon
- tobaccoNicotiana tabacume0
- Material
- burley tobaccoe0
- Organ / stage
- fast growthe0
- Treatment
- molybdenum (Mo)e0
- Outcome
- nitrate reductase activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When treating tobacco crops with molybdenum (Mo) during fast growth, nitrate reductase activity in burley tobacco increased significantly”
Claim · model-written summary
Molybdenum treatment lowered NO 3 -N content.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- molybdenum (Mo)e0
- Outcome
- NO 3 -N contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When treating tobacco crops with molybdenum (Mo) during fast growth, nitrate reductase activity in burley tobacco increased significantly, but the NO 3 -N content decreased”
Claim · model-written summary
The treatments significantly reduced TSNA content.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- These treatmentse0
- Outcome
- TSNA contentse0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These treatments also yielded significant reductions in NO 3 -N and TSNA contents”
t0“Burley Tobacco and Flue-Cured Tobacco”
Claim · model-written summary
The authors recommend Mo during fast growth and Mo-glufosinate at maturity to decrease nitrate and TSNAs.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- treatment with Mo during the fast-growth period and a Mo-Gfo (Mo-glufosinate) combination at the maturity stagee0
- Outcome
- decreasing nitrate and TSNAse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment with Mo during the fast-growth period and a Mo-Gfo (Mo-glufosinate) combination at the maturity stage is an effective strategy for decreasing nitrate and TSNAs during cultivation”
t0“Burley Tobacco and Flue-Cured Tobacco”
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