Abstract
ABSTRACT Rising atmospheric CO 2 concentration ([CO 2 ]) is believed to mitigate the drought stress on plant, and is regulated by soil nitrogen availability. Nonetheless, effects of elevated [CO 2 ] ( e [CO 2 ]) on plant response to drought and their interactive effects on plant N uptake and utilisation remain critical unknown. In this study, three‐month‐old potted tobacco plants (a C 3 model and crop plant) cultivated at two CO 2 concentrations (400 and 800 μmol mol −1 ) were exposed to progressive drought stress after budding‐topping. In this study, 15 N isotopic technique used for analysing the fertiliser‐N transformation in soil and plant organs. Results shown drought generally decreased tobacco biomass, and soil nutrient supply significantly intensify this leaf biomass decreasing induced by drought, while e [CO 2 ] could alleviate the soil drought and nutrient effects on biomass decreasing in upper‐leaf. During progressive drought, e [CO 2 ]‐plants are able to maintain higher root hydraulic conductivity ( K r ) than their a [CO 2 ]‐counterparts, the higher K r induced by e [CO 2 ] were correlated with leaf stomatal conductance ( g s ) decrease and xylem sap ABA ([ABA] xylem ) increase. In other words, soil nutrient supply enhanced the [ABA] xylem of drought‐stressed plants with 3–7 folds higher than none nutrient supply counterparts. Elevated [CO 2 ] induced more fertiliser‐N accumulated in tobacco leaves, especially under well‐watered conditions, which in turn yielded higher photosynthetic nitrogen use efficiency in leaves but low in whole plant. These results suggested that e [CO 2 ] could alleviate drought‐induced photosynthesis limitation by improving root biomass (mainly fine root) and K r , but the alleviation varied with soil nutrient conditions, thereby mitigating the drought‐negative effects on upper‐leaf growth, finally improved tobacco water use efficiency and tobacco production.
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Claims 12
Claim · model-written summary
Drought generally decreased tobacco biomass.
- Taxon
- tobacco
Nicotiana tabacume1 - Treatment
- droughte1
- Outcome
- biomasse1
- Direction
- decreasede1
- Qualifier
- generallye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e1“Results shown drought generally decreased tobacco biomass”
Claim · model-written summary
Soil nutrient supply significantly intensified the drought-induced decrease in leaf biomass of tobacco.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- soil nutrient supplye2
- Outcome
- leaf biomass decreasinge2
- Direction
- intensifye2
- Qualifier
- induced by droughte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e2“soil nutrient supply significantly intensify this leaf biomass decreasing induced by drought”
Claim · model-written summary
Elevated CO2 could alleviate the soil drought and nutrient effects on tobacco biomass decrease.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- e [CO 2 ]e3
- Outcome
- biomass decreasinge3
- Direction
- alleviatee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e3“while e [CO 2 ] could alleviate the soil drought and nutrient effects on biomass decreasing”
Claim · model-written summary
Elevated CO2 plants maintained higher root hydraulic conductivity than ambient CO2 plants during progressive drought.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- e [CO 2 ]e4
- Outcome
- root hydraulic conductivitye4
- Direction
- highere4
- Qualifier
- During progressive droughte4
- Comparator
- a [CO 2 ]-counterpartse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e4“During progressive drought, e [CO 2 ]-plants are able to maintain higher root hydraulic conductivity (K r) than their a [CO 2 ]-counterparts”
Claim · model-written summary
Higher root hydraulic conductivity induced by elevated CO2 is correlated with a decrease in leaf stomatal conductance.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- leafe5
- Treatment
- e [CO 2 ]e5
- Outcome
- leaf stomatal conductancee5
- Direction
- decreasee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e5“the higher K r induced by e [CO 2 ] were correlated with leaf stomatal conductance ( g s ) decrease”
Claim · model-written summary
Higher root hydraulic conductivity induced by elevated CO2 is correlated with an increase in xylem sap ABA.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- e [CO 2 ]e6
- Outcome
- xylem sap ABAe6
- Direction
- increasee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e6“the higher K r induced by e [CO 2 ] were correlated with leaf stomatal conductance ( g s ) decrease and xylem sap ABA ([ABA] xylem ) increase”
Claim · model-written summary
Soil nutrient supply enhanced xylem ABA in drought-stressed tobacco plants 3-7 fold relative to plants without nutrient supply.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- soil nutrient supplye7
- Outcome
- [ABA] xyleme7
- Direction
- enhancede7
- Value
- 3–7 foldse7
- Comparator
- none nutrient supply counterpartse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e7“soil nutrient supply enhanced the [ABA] xylem of drought‐stressed plants with 3–7 folds higher than none nutrient supply counterparts”
Claim · model-written summary
Elevated CO2 induced more fertiliser-N accumulation in tobacco leaves.
- Taxon
- tobaccoNicotiana tabacume1
- Organ / stage
- leavese1
- Treatment
- Elevated [CO 2]e1
- Outcome
- accumulated in tobacco leavese1
- Direction
- moree1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Elevated [CO 2] induced more fertiliser‐N accumulated in tobacco leaves”
Claim · model-written summary
Elevated CO2 yielded higher photosynthetic nitrogen use efficiency in leaves.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- leavese2
- Treatment
- Elevated [CO 2]e1
- Outcome
- photosynthetic nitrogen use efficiencye2
- Direction
- highere2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e1“Elevated [CO 2] induced more fertiliser‐N accumulated in tobacco leaves”
e2“which in turn yielded higher photosynthetic nitrogen use efficiency in leaves but low in whole plant”
Claim · model-written summary
Elevated CO2 gave low photosynthetic nitrogen use efficiency in the whole plant.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- whole plante2
- Treatment
- Elevated [CO 2]e1
- Outcome
- photosynthetic nitrogen use efficiencye2
- Direction
- lowe2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e1“Elevated [CO 2] induced more fertiliser‐N accumulated in tobacco leaves”
e2“which in turn yielded higher photosynthetic nitrogen use efficiency in leaves but low in whole plant”
Claim · model-written summary
Elevated CO2 alleviates drought-induced photosynthesis limitation in tobacco by improving root biomass and hydraulic conductivity.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- e [CO 2]e3
- Outcome
- photosynthesis limitatione3
- Qualifier
- by improving root biomass (mainly fine root) and K re3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e3“These results suggested that e [CO 2] could alleviate drought‐induced photosynthesis limitation by improving root biomass (mainly fine root) and K r”
Claim · model-written summary
Elevated CO2 improved tobacco water use efficiency and tobacco production under drought.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- e [CO 2]e3
- Outcome
- water use efficiency and tobacco productione4
- Direction
- improvede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco (Nicotiana tabacum L.)”
e3“These results suggested that e [CO 2] could alleviate drought‐induced photosynthesis limitation by improving root biomass (mainly fine root) and K r”
e4“finally improved tobacco water use efficiency and tobacco production”
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