Abstract
It is believed that the nicotine concentration in tobacco is closely correlated with the amount of nitrogen (N) supplied. On the other hand, N uptake mainly occurs at the early growth stage, whereas nicotine concentration increases at the late growth stage, especially after removing the shoot apex. To identify the causes of the increased nicotine concentration in tobacco plants, and to compare the effects of different ways of mechanical wounding on nicotine concentration, field experiments were carried out in Fuzhou, Fujian Province in 2003 and 2004. Excision of the shoot apex had almost no influence on N content in the plant; however, it caused dramatic increases in nicotine concentration in leaves, especially in the middle and upper leaves. An additional increase of the nicotine concentration was obtained by removal of axillary buds. The wounding caused by routine leaf harvests, however, did not change the leaf nicotine concentration, and neither did reducing leaf harvest times. The present results revealed no direct relationship between N supply and nicotine concentration in tobacco leaves, and indicate that not all kinds of mechanical wounding were capable of stimulating nicotine synthesis in tobacco plants. Since nicotine production is highly dependent on the removal of apical meristems and hence on the major sources of auxin in the plant, and application of 1-naphthylacetic acid onto the cut surface of the stem after removing the shoot apex markedly decreased the nicotine concentration in different leaves and the total nicotine content in the plant, the results suggest that decreased auxin supply caused by removal of the shoot apex as a kind of mechanical wounding might regulate nicotine synthesis in the roots of tobacco plants.
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Claims 9
Claim · model-written summary
Shoot apex excision had almost no effect on plant nitrogen content.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- Excision of the shoot apexe0
- Outcome
- N content in the plante0
- Direction
- almost no influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excision of the shoot apex had almost no influence on N content in the plant”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
Claim · model-written summary
Shoot apex excision sharply increased nicotine concentration, especially in middle and upper leaves.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- middle and upper leavese0
- Outcome
- nicotine concentration in leavese0
- Direction
- increasese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it caused dramatic increases in nicotine concentration in leaves, especially in the middle and upper leaves.”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
Claim · model-written summary
Axillary bud removal increased nicotine concentration further.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- removal of axillary budse0
- Outcome
- nicotine concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An additional increase of the nicotine concentration was obtained by removal of axillary buds.”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
Claim · model-written summary
Routine leaf harvest wounding did not change leaf nicotine concentration.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- wounding caused by routine leaf harvestse0
- Outcome
- leaf nicotine concentratione0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wounding caused by routine leaf harvests, however, did not change the leaf nicotine concentration”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
Claim · model-written summary
Reducing leaf harvest times did not change leaf nicotine concentration.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- reducing leaf harvest timese0
- Outcome
- leaf nicotine concentratione0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wounding caused by routine leaf harvests, however, did not change the leaf nicotine concentration, and neither did reducing leaf harvest times.”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
Claim · model-written summary
The results indicated no direct relationship between nitrogen supply and leaf nicotine concentration.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- N supplye0
- Outcome
- nicotine concentration in tobacco leavese0
- Direction
- no direct relationshipe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The present results revealed no direct relationship between N supply and nicotine concentration in tobacco leaves”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
Claim · model-written summary
Applying 1-naphthylacetic acid after apex removal decreased nicotine concentration in leaves.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- application of 1-naphthylacetic acid onto the cut surface of the stem after removing the shoot apexe0
- Outcome
- nicotine concentration in different leavese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of 1-naphthylacetic acid onto the cut surface of the stem after removing the shoot apex markedly decreased the nicotine concentration in different leaves and the total nicotine content in the plant”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
Claim · model-written summary
Applying 1-naphthylacetic acid after apex removal decreased total plant nicotine.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- application of 1-naphthylacetic acid onto the cut surface of the stem after removing the shoot apexe0
- Outcome
- total nicotine content in the plante0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of 1-naphthylacetic acid onto the cut surface of the stem after removing the shoot apex markedly decreased the nicotine concentration in different leaves and the total nicotine content in the plant”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
Claim · model-written summary
Reduced auxin supply after apex removal may regulate root nicotine synthesis.
- Taxon
- TobaccoNicotiana tabacumt0
- Compound
- auxine0
- Outcome
- nicotine synthesis in the roots of tobacco plantse0
- Qualifier
- might regulatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased auxin supply caused by removal of the shoot apex as a kind of mechanical wounding might regulate nicotine synthesis in the roots of tobacco plants.”
t0“Nicotine Concentration in Leaves of Flue‐cured Tobacco Plants as Affected by Removal of the Shoot Apex and Lateral Buds”
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See all 9 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.