Abstract
Leaves of tomato (Lycopersicon esculentum) plants grown in soil in which moisture was lowered from field capacity to levels approaching permanent wilting point show a 10-fold increase in abscisic acid (ABA) and a 60 to 70 percent decrease in rbcS and cab steady-state mRNA levels. As indicated by transcription run-on experiments, the effect occurs primarily at the transcriptional level. Similar water deficit had only a minor effect on ABA level and on rbcS and cab expression in leaves of sitiens, an ABA mutant of tomato. Expression of rbcL, the chloroplast gene coding for the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase, is not affected by water stress. Application of exogenous ABA results in decreased rbcS and cab expression in both wild-type and sitiens leaves. Analysis of the expression of individual members of the rbcS gene family indicates that under water-deficit conditions, expression derives primarily from only three of the five rbcS genes. Effects of dark adaptation and water deficit are additive for cab but not for rbcS expression. These results support the hypothesis that, at least under water-deficit conditions, ABA or a derivative thereof mediates a negative regulation of rbcS and cab transcription in tomato plants.
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Claims 11
Claim · model-written summary
Water deficit raised abscisic acid (ABA) about 10-fold in tomato leaves compared with field capacity.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- moisture was lowered from field capacity to levels approaching permanent wilting pointe0
- Outcome
- abscisic acid (ABA)e0
- Direction
- increasee0
- Value
- 10-folde0
- Comparator
- field capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of tomato (Lycopersicon esculentum) plants grown in soil in which moisture was lowered from field capacity to levels approaching permanent wilting point show a 10-fold increase in abscisic acid (ABA)”
Claim · model-written summary
Water deficit reduced rbcS and cab steady-state mRNA levels by 60 to 70 percent in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- moisture was lowered from field capacity to levels approaching permanent wilting pointe0
- Gene
- rbcS and cabe1
- Outcome
- rbcS and cab steady-state mRNA levelse1
- Direction
- decreasee1
- Value
- 60 to 70 percente1
- Comparator
- field capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of tomato (Lycopersicon esculentum) plants grown in soil in which moisture was lowered from field capacity to levels approaching permanent wilting point”
e1“a 60 to 70 percent decrease in rbcS and cab steady-state mRNA levels”
Claim · model-written summary
The water-deficit reduction of rbcS and cab expression occurs primarily at the transcriptional level, as shown by run-on experiments.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- the effecte2
- Qualifier
- primarily at the transcriptional levele2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of tomato (Lycopersicon esculentum) plants”
e2“As indicated by transcription run-on experiments, the effect occurs primarily at the transcriptional level”
Claim · model-written summary
Similar water deficit had only a minor effect on ABA level in the tomato ABA mutant sitiens.
- Taxon
- tomatoSolanum lycopersicume3
- Material
- sitiense3
- Treatment
- Similar water deficite3
- Outcome
- ABA levele3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Similar water deficit had only a minor effect on ABA level and on rbcS and cab expression in leaves of sitiens, an ABA mutant of tomato”
Claim · model-written summary
Similar water deficit had only a minor effect on rbcS and cab expression in the tomato ABA mutant sitiens.
- Taxon
- tomatoSolanum lycopersicume3
- Material
- sitiense3
- Treatment
- Similar water deficite3
- Gene
- rbcS and cabe3
- Outcome
- rbcS and cab expressione3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Similar water deficit had only a minor effect on ABA level and on rbcS and cab expression in leaves of sitiens, an ABA mutant of tomato”
Claim · model-written summary
Exogenous ABA decreased rbcS and cab expression in both wild-type and sitiens tomato leaves.
- Taxon
- tomatoSolanum lycopersicume3
- Material
- wild-type and sitiense4
- Treatment
- Application of exogenous ABAe4
- Outcome
- rbcS and cab expressione4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“an ABA mutant of tomato”
e4“Application of exogenous ABA results in decreased rbcS and cab expression in both wild-type and sitiens leaves”
Claim · model-written summary
Under water-deficit conditions, rbcS expression derives primarily from only three of the five rbcS genes in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Gene
- rbcSe5
- Outcome
- expressione5
- Qualifier
- primarily from only three of the five rbcS genese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of tomato (Lycopersicon esculentum) plants”
e5“Analysis of the expression of individual members of the rbcS gene family indicates that under water-deficit conditions, expression derives primarily from only three of the five rbcS genes”
Claim · model-written summary
Effects of dark adaptation and water deficit are additive for cab expression in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Gene
- cabe6
- Outcome
- Effects of dark adaptation and water deficite6
- Qualifier
- additive for cabe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of tomato (Lycopersicon esculentum) plants”
e6“Effects of dark adaptation and water deficit are additive for cab but not for rbcS expression”
Claim · model-written summary
Effects of dark adaptation and water deficit are not additive for rbcS expression in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Gene
- rbcSe6
- Outcome
- Effects of dark adaptation and water deficite6
- Qualifier
- not for rbcS expressione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of tomato (Lycopersicon esculentum) plants”
e6“Effects of dark adaptation and water deficit are additive for cab but not for rbcS expression”
Claim · model-written summary
Water stress does not affect rbcL expression in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- water stresse7
- Gene
- rbcLe7
- Outcome
- Expression of rbcLe7
- Direction
- no_changeinferrede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of tomato (Lycopersicon esculentum) plants”
e7“Expression of rbcL, the chloroplast gene coding for the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase, is not affected by water stress”
Claim · model-written summary
ABA or a derivative thereof probably mediates negative regulation of rbcS and cab transcription in tomato under water deficit.
- Taxon
- tomatoSolanum lycopersicume7
- Compound
- ABA or a derivative thereofe7
- Outcome
- negative regulation of rbcS and cab transcriptione7
- Qualifier
- at least under water-deficit conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“These results support the hypothesis that, at least under water-deficit conditions, ABA or a derivative thereof mediates a negative regulation of rbcS and cab transcription in tomato plants”
The same questions in other papers
drought · molecular: expression · Solanum lycopersicum (tomato)Positive and negative results
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