Abstract
Plants have evolved multiple strategies to survive and adapt when confronting the changing climate, including elevated CO 2 concentration ( e [CO 2 ]) and intensified drought stress. To explore the role of abscisic acid (ABA) in modulating the response of plant water relation characteristics to progressive drought under ambient ( a [CO 2 ], 400 ppm) and e [CO 2 ] (800 ppm) growth environments, two tomato ( Solanum lycopersicum ) genotypes, Ailsa Craig (AC) and its ABA-deficient mutant ( flacca ), were grown in pots, treated with or without exogenous ABA, and exposed to progressive soil drying until all plant available water in the pot was depleted. The results showed that exogenous ABA application improved leaf water potential, osmotic potential, and leaf turgor and increased leaf ABA concentrations ([ABA] leaf ) in AC and flacca . In both genotypes, exogenous ABA application decreased stomatal pore aperture and stomatal conductance ( g s ), though these effects were less pronounced in e [CO 2 ]-grown AC and g s of ABA-treated flacca was gradually increased until a soil water threshold after which g s started to decline. In addition, ABA-treated flacca showed a partly restored stomatal drought response even when the accumulation of [ABA] leaf was vanished, implying [ABA] leaf might be not directly responsible for the decreased g s . During soil drying, [ABA] leaf remained higher in e [CO 2 ]-grown plants compared with those under a [CO 2 ], and a high xylem sap ABA concentration was also noticed in the ABA-treated flacca especially under e [CO 2 ], suggesting that e [CO 2 ] might exert an effect on ABA degradation and/or redistribution. Collectively, a fine-tune ABA homeostasis under combined e [CO 2 ] and drought stress allowed plants to optimize leaf gas exchange and plant water relations, yet more detailed research regarding ABA metabolism is still needed to fully explore the role of ABA in mediating plant physiological response to future drier and CO 2 -enriched climate.
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Claims 8
Claim · model-written summary
Exogenous ABA improved leaf water potential, osmotic potential and turgor in both genotypes.
- Taxon
- tomato
Solanum lycopersicumt0 - Material
- AC and flaccae0
- Treatment
- exogenous ABA applicatione0
- Outcome
- leaf water potential, osmotic potential, and leaf turgore0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous ABA application improved leaf water potential, osmotic potential, and leaf turgor and increased leaf ABA concentrations ([ABA] leaf ) in AC and flacca”
t0“Tomato”
Claim · model-written summary
Exogenous ABA increased leaf ABA concentrations in both genotypes.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- AC and flaccae0
- Treatment
- exogenous ABA applicatione0
- Outcome
- leaf ABA concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous ABA application improved leaf water potential, osmotic potential, and leaf turgor and increased leaf ABA concentrations ([ABA] leaf ) in AC and flacca”
t0“Tomato”
Claim · model-written summary
ABA application decreased stomatal pore aperture and stomatal conductance in both genotypes.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- exogenous ABA applicatione0
- Outcome
- stomatal pore aperture and stomatal conductancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both genotypes, exogenous ABA application decreased stomatal pore aperture and stomatal conductance ( g s )”
t0“Tomato”
Claim · model-written summary
The stomatal effects of ABA were less pronounced in elevated-CO2-grown AC.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- ACe0
- Treatment
- e [CO 2 ]e0
- Outcome
- these effects were less pronouncede0
- Direction
- less pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“though these effects were less pronounced in e [CO 2 ]-grown AC”
t0“Tomato”
Claim · model-written summary
ABA-treated flacca stomatal conductance increased until a soil water threshold and then declined.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- flaccae0
- Outcome
- g se0
- Direction
- gradually increasede0
- Qualifier
- until a soil water threshold after which g s started to declinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“g s of ABA-treated flacca was gradually increased until a soil water threshold after which g s started to decline”
t0“Tomato”
Claim · model-written summary
ABA-treated flacca partly recovered its stomatal drought response even without accumulated leaf ABA.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- flaccae0
- Outcome
- partly restored stomatal drought responsee0
- Qualifier
- even when the accumulation of [ABA] leaf was vanishede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA-treated flacca showed a partly restored stomatal drought response even when the accumulation of [ABA] leaf was vanished”
t0“Tomato”
Claim · model-written summary
During soil drying, leaf ABA remained higher under elevated than ambient CO2.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- e [CO 2 ]e0
- Outcome
- [ABA] leafe0
- Direction
- highere0
- Comparator
- a [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During soil drying, [ABA] leaf remained higher in e [CO 2 ]-grown plants compared with those under a [CO 2 ]”
t0“Tomato”
Claim · model-written summary
ABA-treated flacca had high xylem sap ABA, especially under elevated CO2.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- flaccae0
- Outcome
- xylem sap ABA concentratione0
- Direction
- highe0
- Qualifier
- especially under e [CO 2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a high xylem sap ABA concentration was also noticed in the ABA-treated flacca especially under e [CO 2 ]”
t0“Tomato”
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See all 15 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.