Abstract
【Objective】Effects of decapitation on plant growth, nutrients absorption and distributionwithin plant, as well as potassium (K) absorption dynamic and kinetics in tobacco plants were examined. 【Method】A root nutrients absorption kinetic method was applied under hydroponic culture.【Result】The results showed that in the control plant, 57% of the net dry matter gain and 44%-68% of the net increase in mineral nutrients (including N, P, K, Ca, etc.) was deposited in the top. In the decapitation and decapitation+NAA plants, the majority of the net increases in dry matter and nutrients were allocated into the upper leaves and roots. The studies on the K uptake kinetics showed that K uptake activity and affinity were the highest in the control plant, and the lowest in the decapitated plant. 【Conclusion】 In conclusion, the shoot apex is the strongest sink for dry matter and nutrients, and can regulate not only the dry matter and nutrients allocation among the different organs, but also the nutrients absorption activity by the auxin synthesized in and transported from the apex. Exogenous application of NAA after removal of the shoot apex can partly replace the role of the shoot apex to stimulate the root nutrients uptake activity.
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Claims 8
Claim · model-written summary
Control plants deposited 57% of net dry matter gain in the top.
- Taxon
- tobacco plants
Nicotiana tabacumt0 - Organ / stage
- tope0
- Outcome
- net dry matter gaine0
- Value
- 57%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the control plant, 57% of the net dry matter gain and 44%-68% of the net increase in mineral nutrients (including N, P, K, Ca, etc.) was deposited in the top.”
t0“tobacco plants”
Claim · model-written summary
Control plants deposited 44%-68% of net mineral nutrient increase in the top.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Organ / stage
- tope0
- Outcome
- net increase in mineral nutrientse0
- Value
- 44%-68%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“44%-68% of the net increase in mineral nutrients (including N, P, K, Ca, etc.) was deposited in the top.”
t0“tobacco plants”
Claim · model-written summary
Decapitation allocated most net dry matter and nutrient increases to upper leaves and roots.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Organ / stage
- upper leaves and rootse0
- Treatment
- decapitatione0
- Outcome
- net increases in dry matter and nutrientse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the decapitation and decapitation+NAA plants, the majority of the net increases in dry matter and nutrients were allocated into the upper leaves and roots.”
t0“tobacco plants”
Claim · model-written summary
Decapitation plus NAA allocated most net dry matter and nutrient increases to upper leaves and roots.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Organ / stage
- upper leaves and rootse0
- Treatment
- decapitation+NAAe0
- Outcome
- net increases in dry matter and nutrientse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the decapitation and decapitation+NAA plants, the majority of the net increases in dry matter and nutrients were allocated into the upper leaves and roots.”
t0“tobacco plants”
Claim · model-written summary
Potassium uptake activity and affinity were highest in control plants.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Treatment
- control plante0
- Outcome
- K uptake activity and affinitye0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K uptake activity and affinity were the highest in the control plant, and the lowest in the decapitated plant.”
t0“tobacco plants”
Claim · model-written summary
Potassium uptake activity and affinity were lowest after decapitation.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Treatment
- decapitated plante0
- Outcome
- K uptake activity and affinitye0
- Direction
- loweste0
- Comparator
- control plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K uptake activity and affinity were the highest in the control plant, and the lowest in the decapitated plant.”
t0“tobacco plants”
Claim · model-written summary
The shoot apex is interpreted as the strongest sink and as regulating allocation and uptake through its auxin.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Organ / stage
- shoot apexe0
- Compound
- auxine0
- Outcome
- dry matter and nutrients allocation among the different organse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot apex is the strongest sink for dry matter and nutrients, and can regulate not only the dry matter and nutrients allocation among the different organs, but also the nutrients absorption activity by the auxin synthesized in and transported from the apex.”
t0“tobacco plants”
Claim · model-written summary
Exogenous NAA partly replaced the apex in stimulating root nutrient uptake after apex removal.
- Taxon
- tobacco plantsNicotiana tabacumt0
- Treatment
- Exogenous application of NAAe0
- Outcome
- root nutrients uptake activitye0
- Direction
- stimulatee0
- Qualifier
- after removal of the shoot apexe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous application of NAA after removal of the shoot apex can partly replace the role of the shoot apex to stimulate the root nutrients uptake activity.”
t0“tobacco plants”
The same questions in other papers
1-naphthaleneacetic acid · nutrient: content · Nicotiana tabacum (tobacco)Results agree
1 paper in the same direction as this paper
- positive
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.