Abstract
Abstract The stimulation effect of elevated [CO 2 ] ( e [CO 2 ]) on plant growth is modulated by nitrogen (N) availability, yet the mechanisms of this modulation under patchy N supply remain largely elusive. This study aimed to investigate the mechanisms by which patchy nutrient supply in the root‐zone influence on N uptake, partitioning and use efficiency of tobacco plants ( Nicotiana tabacum L.) grown under e [CO 2 ]. A split‐root pot experiment was conducted on tobacco plants grown at ambient ( a [CO 2 ], 400 μmol L −1 ) and e [CO 2 ] (800 μmol L −1 ) conditions during anthesis. Plants were subjected to two fertilizer levels [0 and 113‐29‐214 (N‐P‐K) mg kg −1 soil] and three fertilization regimes (partial root‐zone fertilization, PRN, couple root‐zone fertilization, CRN and no fertilization, CK). Elevated [CO 2 ] significantly decreased N concentrations in all tobacco organs, with the greatest reduction in leaves. Positive responses of tobacco biomass and NUE to e [CO 2 ] were recorded, and a large amount of 15 N labelled fertilizer‐N was partitioned to stems at the expense to leaves. Compared to the partially fertilized root, an equal N concentration was observed in the non‐fertilized root. In addition, compared with CRN, PRN increased the root exudates of sugar and organic acid; however, the increased root biomass by nutrient patchiness did not enhance plant total N uptake. Collectively, e [CO 2 ] could sustain N assimilation and distribution of tobacco plants in response to natural heterogeneous nutrient available in the soil caused by patchy fertilization.
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Claims 6
Claim · model-written summary
Elevated CO2 significantly decreased N concentrations in all tobacco organs, most in leaves.
- Taxon
- Nicotiana tabacum L.
Nicotiana tabacumt0 - Organ / stage
- all tobacco organse0
- Treatment
- Elevated [CO 2 ]e0
- Outcome
- N concentrationse0
- Direction
- decreasede0
- Qualifier
- during anthesise6
- Comparator
- ambiente6
- Setting
- split‐root pot experimente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum L. (tobacco)”
e0“Elevated [CO 2 ] significantly decreased N concentrations in all tobacco organs, with the greatest reduction in leaves”
e6“A split‐root pot experiment was conducted on tobacco plants grown at ambient ( a [CO 2 ], 400 μmol L −1 ) and e [CO 2 ] (800 μmol L −1 ) conditions during anthesis”
Claim · model-written summary
Elevated CO2 gave positive responses of tobacco biomass and nitrogen use efficiency.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- e [CO 2 ]e1
- Outcome
- biomass and NUEe1
- Direction
- Positive responsese1
- Comparator
- ambiente6
- Setting
- split‐root pot experimente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum L. (tobacco)”
e1“Positive responses of tobacco biomass and NUE to e [CO 2 ] were recorded”
e6“A split‐root pot experiment was conducted on tobacco plants grown at ambient ( a [CO 2 ], 400 μmol L −1 ) and e [CO 2 ] (800 μmol L −1 ) conditions during anthesis”
Claim · model-written summary
A large amount of fertilizer-derived 15N was partitioned to tobacco stems at the expense of leaves.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Organ / stage
- stemse2
- Outcome
- partitioned to stemse2
- Comparator
- leavese2
- Setting
- split‐root pot experimente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum L. (tobacco)”
e2“a large amount of 15 N labelled fertilizer‐N was partitioned to stems at the expense to leaves”
e6“A split‐root pot experiment was conducted on tobacco plants grown at ambient ( a [CO 2 ], 400 μmol L −1 ) and e [CO 2 ] (800 μmol L −1 ) conditions during anthesis”
Claim · model-written summary
The non-fertilized root had an N concentration equal to that of the partially fertilized root.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- non‐fertilized roote3
- Outcome
- N concentratione3
- Direction
- equale3
- Comparator
- partially fertilized roote3
- Setting
- split‐root pot experimente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum L. (tobacco)”
e3“Compared to the partially fertilized root, an equal N concentration was observed in the non‐fertilized root”
e6“A split‐root pot experiment was conducted on tobacco plants grown at ambient ( a [CO 2 ], 400 μmol L −1 ) and e [CO 2 ] (800 μmol L −1 ) conditions during anthesis”
Claim · model-written summary
PRN increased root exudates of sugar and organic acid compared with CRN.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- PRNe4
- Outcome
- root exudates of sugar and organic acide4
- Direction
- increasede4
- Comparator
- CRNe4
- Setting
- split‐root pot experimente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum L. (tobacco)”
e4“compared with CRN, PRN increased the root exudates of sugar and organic acid”
e6“A split‐root pot experiment was conducted on tobacco plants grown at ambient ( a [CO 2 ], 400 μmol L −1 ) and e [CO 2 ] (800 μmol L −1 ) conditions during anthesis”
Claim · model-written summary
Increased root biomass from nutrient patchiness did not enhance plant total N uptake.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- nutrient patchinesse5
- Outcome
- plant total N uptakee5
- Direction
- did not enhancee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum L. (tobacco)”
e5“the increased root biomass by nutrient patchiness did not enhance plant total N uptake”
The same questions in other papers
co2 · growth · Nicotiana tabacum (tobacco)Positive and negative results
11 papers in the same direction as this paper · 6 in the opposite direction
- positive
- negative
- no effect
14 papers more in this group
See all 18 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.