Abstract
The reduced pool of the ABA precursors, β,β-carotenoids, in roots does not account for the substantial increase in ABA content in response to water stress (WS) conditions, suggesting that ABA could be transported from other organs. Basipetal transport was interrupted by stem-girdling, and ABA levels were determined in roots after two cycles of WS induced by transplanting plants to dry perlite. Leaf applications of isotope-labeled ABA and reciprocal grafting of ABA-deficient tomato mutants were used to confirm the involvement of aerial organs on root ABA accumulation. Disruption of basipetal transport reduced ABA accumulation in roots, and this decrease was more severe after two consecutive WS periods. This effect was linked to a sharp decrease in the β,β-carotenoid pool in roots in response to water deficit. Significant levels of isotope-labeled ABA were transported from leaves to roots, mainly in plants subjected to water dehydration. Furthermore, the use of different ABA-deficient tomato mutants in reciprocal grafting combinations with wild-type genotypes confirmed the involvement of aerial organs in the ABA accumulation in roots. In conclusion, accumulation of ABA in roots after long-term WS periods largely relies on the aerial organs, suggesting a reduced ability of the roots to synthesize ABA from carotenoids. Furthermore, plants are able to transport ABA basipetally to sustain high hormone levels in roots.
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Claims 7
Claim · model-written summary
Stem girdling reduced root ABA accumulation.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- Disruption of basipetal transporte0
- Outcome
- ABA accumulation in rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disruption of basipetal transport reduced ABA accumulation in roots”
e1“grafting of ABA-deficient tomato mutants”
Claim · model-written summary
The girdling-associated decrease in root ABA was more severe after two consecutive water stress periods.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- Disruption of basipetal transporte2
- Outcome
- ABA accumulation in rootse2
- Direction
- more severee0
- Qualifier
- two consecutive WS periodse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this decrease was more severe after two consecutive WS periods”
e1“grafting of ABA-deficient tomato mutants”
e2“Disruption of basipetal transport reduced ABA accumulation in roots”
Claim · model-written summary
Root carotenoid pool sharply decreased under water deficit.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- water deficite0
- Outcome
- β,β-carotenoid pool in rootse0
- Direction
- sharp decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sharp decrease in the β,β-carotenoid pool in roots in response to water deficit”
e1“grafting of ABA-deficient tomato mutants”
Claim · model-written summary
Isotope-labeled ABA moved from leaves to roots, mainly under dehydration.
- Taxon
- tomatoSolanum lycopersicume1
- Outcome
- isotope-labeled ABA were transported from leaves to rootse0
- Qualifier
- mainly in plants subjected to water dehydratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant levels of isotope-labeled ABA were transported from leaves to roots, mainly in plants subjected to water dehydration”
e1“grafting of ABA-deficient tomato mutants”
Claim · model-written summary
Reciprocal grafting confirmed aerial organ involvement in root ABA accumulation.
- Taxon
- tomatoSolanum lycopersicume0
- Material
- ABA-deficient tomato mutantse0
- Outcome
- involvement of aerial organs in the ABA accumulation in rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the use of different ABA-deficient tomato mutants in reciprocal grafting combinations with wild-type genotypes confirmed the involvement of aerial organs in the ABA accumulation in roots”
Claim · model-written summary
The authors concluded root ABA accumulation after prolonged stress relies largely on aerial organs.
- Taxon
- tomatoSolanum lycopersicume1
- Outcome
- accumulation of ABA in rootse0
- Qualifier
- largely relies on the aerial organse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulation of ABA in roots after long-term WS periods largely relies on the aerial organs”
e1“grafting of ABA-deficient tomato mutants”
Claim · model-written summary
The authors infer reduced root capacity to synthesize ABA from carotenoids.
- Taxon
- tomatoSolanum lycopersicume1
- Compound
- carotenoidse0
- Outcome
- reduced ability of the roots to synthesize ABAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting a reduced ability of the roots to synthesize ABA from carotenoids”
e1“grafting of ABA-deficient tomato mutants”
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See all 32 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.