Abstract
The flacca mutant in tomato (Lycopersicon esculentum Mill. cv Rheinlands Ruhm) was employed to examine the effects of a relatively constant diurnal water stress on leaf growth and water relations. As the mutant is deficient in abscisic acid (ABA) and can be phenotypically reverted to the wild type by applications of the growth substance, inferences can be made concerning the involvement of ABA in responses to water stress. Water potential and turgor were lower in leaves of flacca than of Rheinlands Ruhm, and were increased by ABA treatment. ABA decreased transpiration rates by causing stomatal closure and also increased the hydraulic conductance of the sprayed plants. Osmotic adjustment did not occur in flacca plants despite the daily leaf water deficits. Stem elongation was inhibited by ABA, but leaf growth was promoted. It is concluded that, in some cases, ABA may promote leaf growth via its effect on leaf water balance.
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Claims 8
Claim · model-written summary
Flacca leaves had lower water potential and turgor than Rheinlands Ruhm.
- Taxon
- tomato
Solanum lycopersicumt0 - Material
- flaccae0
- Organ / stage
- leavese0
- Outcome
- Water potential and turgore0
- Direction
- lowere0
- Comparator
- Rheinlands Ruhme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water potential and turgor were lower in leaves of flacca than of Rheinlands Ruhm”
t0“Tomato”
Claim · model-written summary
ABA increased water potential and turgor in flacca leaves.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- flaccae0
- Treatment
- ABA treatmente0
- Outcome
- Water potential and turgore0
- Direction
- increasede0
- Comparator
- Rheinlands Ruhme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water potential and turgor were lower in leaves of flacca than of Rheinlands Ruhm, and were increased by ABA treatment”
t0“Tomato”
Claim · model-written summary
ABA reduced transpiration rates through stomatal closure.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- ABAe0
- Outcome
- transpiration ratese0
- Direction
- decreasede0
- Qualifier
- stomatal closuree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA decreased transpiration rates by causing stomatal closure”
t0“Tomato”
Claim · model-written summary
ABA increased hydraulic conductance of sprayed plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- hydraulic conductancee0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the hydraulic conductance of the sprayed plants”
t0“Tomato”
Claim · model-written summary
Flacca plants showed no osmotic adjustment despite daily water deficits.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- flaccae0
- Outcome
- Osmotic adjustment did not occure0
- Qualifier
- daily leaf water deficitse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic adjustment did not occur in flacca plants despite the daily leaf water deficits”
t0“Tomato”
Claim · model-written summary
ABA inhibited stem elongation.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- ABAe0
- Outcome
- Stem elongatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem elongation was inhibited by ABA”
t0“Tomato”
Claim · model-written summary
ABA promoted leaf growth.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- leaf growthe0
- Direction
- promotede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but leaf growth was promoted”
t0“Tomato”
Claim · model-written summary
Authors infer that ABA can promote leaf growth through leaf water balance in some cases.
- Taxon
- tomatoSolanum lycopersicumt0
- Compound
- ABAe0
- Outcome
- leaf growthe0
- Qualifier
- leaf water balancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in some cases, ABA may promote leaf growth via its effect on leaf water balance”
t0“Tomato”
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- no effect
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See all 7 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.