Abstract
Global climate change will modify plants in terms of growth and physiology. To better understand the consequences of this effect, the responses of the leaf water relations and nitrogen (N) use efficiency of barley and tomato plants to elevated CO2 (e[CO2], 800 ppm) combined with progressive drought stress at two levels of N supply (N1, 0.5 g N pot−1 and N2, 1.0 g N pot−1) were studied. The plants were grown in two separate phytotrons at ambient CO2 (a[CO2], 400 ppm) and e[CO2], respectively. The leaf physiological parameters as well as carbon (C) and N concentrations were determined; plant growth, water and N use efficiencies were evaluated. The results showed that e[CO2] increased photosynthesis and water use efficiency (WUE) while decreased specific leaf area (SLA) in both species, whereas N supply level differentially influenced WUE in barley and tomato plants. The abscisic acid (ABA)-induced stomatal closure during progressive soil drying varied between the two species where the stomatal conductance (gs) of barley plants was more sensitive to leaf ABA than tomato plants, though CO2 environment did not affect the response in both species. Compared to a[CO2], e[CO2] reduced plant transpiration rate (Tplant) in barley but not in tomato. e[CO2] increased the leaf C:N ratio ([C:N]leaf) in plants by enhancing leaf C concentration ([C]leaf) in barley and by dilution of leaf N concentration ([N]leaf) in tomato, respectively, but N2 substantially decreased [C:N]leaf, and thus, N treatment was the dominant factor controlling [C:N]leaf. Collectively, appropriate N supply may modulate the acclimation of plants to e[CO2] and soil water deficits. This study provides some novel insights into N management of different plant species for adapting to future drier and CO2-enriched environment.
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Claims 10
Claim · model-written summary
Elevated CO2 increased photosynthesis and water use efficiency and decreased specific leaf area in both species.
- Taxon
- barley and tomato
Solanum lycopersicum.jpg?width=60)
Hordeum vulgaree1 - Treatment
- e[CO2]e0
- Outcome
- photosynthesis and water use efficiency (WUE)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“e[CO2] increased photosynthesis and water use efficiency (WUE) while decreased specific leaf area (SLA) in both species”
e1“of barley and tomato plants to elevated CO2”
Claim · model-written summary
Elevated CO2 decreased specific leaf area in barley and tomato.
- Taxon
- barley and tomatoSolanum lycopersicumHordeum vulgaree1
- Treatment
- e[CO2]e0
- Outcome
- specific leaf area (SLA)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“e[CO2] increased photosynthesis and water use efficiency (WUE) while decreased specific leaf area (SLA) in both species”
e1“of barley and tomato plants to elevated CO2”
Claim · model-written summary
Nitrogen supply level influenced water use efficiency differently in barley and tomato.
- Taxon
- barley and tomatoSolanum lycopersicumHordeum vulgaree0
- Treatment
- N supply levele0
- Outcome
- WUEe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N supply level differentially influenced WUE in barley and tomato plants”
Claim · model-written summary
Barley stomatal conductance was more sensitive to leaf ABA than tomato conductance during drying.
- Taxon
- barleyHordeum vulgaree0
- Compound
- leaf ABAe0
- Outcome
- stomatal conductance (gs)e0
- Direction
- more sensitivee0
- Comparator
- tomato plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance (gs) of barley plants was more sensitive to leaf ABA than tomato plants”
Claim · model-written summary
CO2 environment did not affect ABA-related stomatal responses in either species.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- CO2 environmente0
- Outcome
- the responsee0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2 environment did not affect the response in both species”
e1“stomatal conductance (gs) of barley plants was more sensitive to leaf ABA than tomato plants”
Claim · model-written summary
Elevated CO2 reduced whole-plant transpiration in barley.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- e[CO2]e0
- Outcome
- plant transpiration rate (Tplant)e0
- Direction
- reducede0
- Comparator
- a[CO2]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to a[CO2], e[CO2] reduced plant transpiration rate (Tplant) in barley but not in tomato”
Claim · model-written summary
Elevated CO2 did not reduce whole-plant transpiration in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- e[CO2]e0
- Outcome
- plant transpiration rate (Tplant)e0
- Direction
- no_changeinferrede0
- Comparator
- a[CO2]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to a[CO2], e[CO2] reduced plant transpiration rate (Tplant) in barley but not in tomato”
Claim · model-written summary
Elevated CO2 increased leaf C:N ratio in barley by enhancing leaf carbon concentration.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- e[CO2]e0
- Outcome
- leaf C:N ratio ([C:N]leaf)e0
- Direction
- increasede0
- Qualifier
- enhancing leaf C concentration ([C]leaf)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“e[CO2] increased the leaf C:N ratio ([C:N]leaf) in plants by enhancing leaf C concentration ([C]leaf) in barley”
Claim · model-written summary
Elevated CO2 increased leaf C:N ratio in tomato through dilution of leaf nitrogen.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- e[CO2]e0
- Outcome
- leaf C:N ratio ([C:N]leaf)e0
- Direction
- increasede0
- Qualifier
- dilution of leaf N concentration ([N]leaf)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“e[CO2] increased the leaf C:N ratio ([C:N]leaf) in plants by enhancing leaf C concentration ([C]leaf) in barley and by dilution of leaf N concentration ([N]leaf) in tomato”
Claim · model-written summary
Higher nitrogen supply substantially decreased leaf C:N ratio.
- Taxon
- barley and tomatoSolanum lycopersicumHordeum vulgaree1
- Treatment
- N2e0
- Outcome
- [C:N]leafe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N2 substantially decreased [C:N]leaf”
e1“of barley and tomato plants to elevated CO2”
The same questions in other papers
co2 · physiology: gas exchange · Solanum lycopersicum (tomato)Positive and negative results
1 paper in the same direction as this paper · 8 reporting no difference from an alternative
- positive
- positive
- positive
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