Abstract
The photosynthetic capacity of leaves is dramatically influenced by nitrogen (N) availability in the soil, as CO2 concentration in chloroplasts and photosynthetic biochemical capacity are related to leaf N content. The relationship between mesophyll conductance (gm) and leaf N content was expected to be shaped by leaf anatomical traits. However, the increased gm in mature leaves achieved by N top-dressing is unlikely to be caused by changes in leaf anatomy. Here, we assessed the impacts of N supply on leaf anatomical, biochemical, and photosynthetic features, specifically, the dynamic responses of leaf anatomy, biochemistry, and photosynthesis to N top-dressing in tobacco. Plant performance was substantially affected by soil N status. In comparison with the leaves of plants subjected to low N treatment, leaves of plants with high N treatment photosynthesized significantly more, due to higher CO2 diffusion conductance and photosynthetic biochemical capacity. The high gm in high N-treated leaves apparently related to modifications in the leaf anatomy; however, the rapid response of gm to N top-dressing cannot be fully explained by leaf anatomical modifications.
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Claims 6
Claim · model-written summary
Soil nitrogen status affected tobacco performance.
- Taxon
- tobacco
Nicotiana tabacume1 - Treatment
- soil N statuse0
- Outcome
- Plant performancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant performance was substantially affected by soil N status”
e1“N top-dressing in tobacco”
Claim · model-written summary
High-N leaves photosynthesized significantly more than low-N leaves.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- high N treatmente0
- Outcome
- photosynthesizede0
- Direction
- moree0
- Comparator
- low N treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In comparison with the leaves of plants subjected to low N treatment, leaves of plants with high N treatment photosynthesized significantly more”
e1“N top-dressing in tobacco”
Claim · model-written summary
Higher CO2 diffusion conductance contributed to greater photosynthesis.
- Taxon
- tobaccoNicotiana tabacume1
- Outcome
- CO2 diffusion conductancee0
- Direction
- highere0
- Qualifier
- photosynthetic biochemical capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“due to higher CO2 diffusion conductance and photosynthetic biochemical capacity”
e1“N top-dressing in tobacco”
Claim · model-written summary
Higher photosynthetic biochemical capacity contributed to greater photosynthesis.
- Taxon
- tobaccoNicotiana tabacume1
- Outcome
- photosynthetic biochemical capacitye0
- Qualifier
- higher CO2 diffusion conductancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher CO2 diffusion conductance and photosynthetic biochemical capacity”
e1“N top-dressing in tobacco”
Claim · model-written summary
High mesophyll conductance was apparently related to leaf anatomy.
- Taxon
- tobaccoNicotiana tabacume1
- Organ / stage
- leaf anatomye0
- Treatment
- high N-treatede0
- Outcome
- gme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high gm in high N-treated leaves apparently related to modifications in the leaf anatomy”
e1“N top-dressing in tobacco”
Claim · model-written summary
Leaf anatomy did not fully explain the rapid conductance response to top-dressing.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- N top-dressinge0
- Outcome
- response of gme0
- Qualifier
- leaf anatomical modificationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rapid response of gm to N top-dressing cannot be fully explained by leaf anatomical modifications”
e1“N top-dressing in tobacco”
The same questions in other papers
nitrogen · physiology: photosynthesis · Nicotiana tabacum (tobacco)Positive and negative results
13 papers in the same direction as this paper · 9 in the opposite direction
- negative
- no effect
- negative
19 papers more in this group
See all 23 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.