Abstract
Dry mass production, leaf characteristics and diurnal photosynthesis of two N. tabacum L. genotypes selected for survival at low CO2 and the parent Wisconsin-38 (control plants) were measured on water-stressed and well-watered plants in the field. Differences in photosynthesis per unit leaf area were small and not significant between genotypes, but different patterns of photosynthesis were observed in stressed and non-stressed plants, with water stress reducing total net carbon fixation by 45% in all genotypes. More dry mass was produced by the selected genotypes than by Wisconsin-38 under irrigation. Production was smaller and the same for all three genotypes when stressed. The increased dry mass of the selected genotypes was related to greater total leaf area per plant which was accompanied by more cells per unit leaf area but smaller cell volume than in the control plants. The decrease in dry mass production under water stress was related to a decrease in total leaf area per plant and a decrease in cell number per unit leaf area; however, cell volume increased.
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Claims 10
Claim · model-written summary
Photosynthesis per leaf area did not differ significantly between genotypes.
Verbatim
e0“Differences in photosynthesis per unit leaf area were small and not significant between genotypes”
e1“N. tabacum L. genotypes”
Claim · model-written summary
Water stress reduced total net carbon fixation by 45% in all genotypes.
- Taxon
- N. tabacum L.e1
- Treatment
- water stresse0
- Outcome
- total net carbon fixatione0
- Direction
- reducinge0
- Value
- 45%e0
Not reportedComparator
Verbatim
e0“water stress reducing total net carbon fixation by 45% in all genotypes”
e1“N. tabacum L. genotypes”
Claim · model-written summary
Selected genotypes produced more dry mass than Wisconsin-38 under irrigation.
Verbatim
e0“More dry mass was produced by the selected genotypes than by Wisconsin-38 under irrigation”
e1“N. tabacum L. genotypes”
Claim · model-written summary
Under water stress, dry mass production was smaller and equal among the three genotypes.
Verbatim
e0“Production was smaller and the same for all three genotypes when stressed”
e1“N. tabacum L. genotypes”
Claim · model-written summary
The selected genotypes had greater total leaf area than controls.
Verbatim
e0“greater total leaf area per plant which was accompanied by more cells per unit leaf area but smaller cell volume than in the control plants”
e1“N. tabacum L. genotypes”
e2“More dry mass was produced by the selected genotypes than by Wisconsin-38 under irrigation”
Claim · model-written summary
Selected genotypes had more cells per unit leaf area than controls.
Verbatim
e0“more cells per unit leaf area but smaller cell volume than in the control plants”
e1“N. tabacum L. genotypes”
Claim · model-written summary
Selected genotypes had smaller cell volume than controls.
Verbatim
e0“smaller cell volume than in the control plants”
e1“N. tabacum L. genotypes”
Claim · model-written summary
Water stress decreased total leaf area per plant.
Not reportedComparator
Verbatim
e0“under water stress was related to a decrease in total leaf area per plant and a decrease in cell number per unit leaf area; however, cell volume increased”
e1“N. tabacum L. genotypes”
Claim · model-written summary
Water stress decreased cell number per unit leaf area.
- Taxon
- N. tabacum L.e1
- Treatment
- water stresse0
- Outcome
- cell number per unit leaf areae0
- Direction
- decreasee0
Not reportedComparator
Verbatim
e0“under water stress was related to a decrease in total leaf area per plant and a decrease in cell number per unit leaf area; however, cell volume increased”
e1“N. tabacum L. genotypes”
Claim · model-written summary
Water stress increased cell volume.
Not reportedComparator
Verbatim
e0“under water stress was related to a decrease in total leaf area per plant and a decrease in cell number per unit leaf area; however, cell volume increased”
e1“N. tabacum L. genotypes”
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