Abstract
In this study xylem hydraulic resistances of peduncles (truss stalk), pedicels (fruit stalk) and the future abscission zone (AZ) halfway along the pedicel of tomato (Lycopersicon esculentum L.) plants were directly measured at different stages of fruit development, in plants grown under two levels of water availability in the root environment. The xylem hydraulic connection between shoot and fruits has previously been investigated, but contradictory conclusions were drawn about the presence of a flow resistance barrier in the pedicel. These conclusions were all based on indirect functional measurements and anatomical observations of water-conducting tissue in the pedicel. In the present study, by far the largest resistances were measured in the AZ where most individual vessels ended. Plants grown at low water availability in the root environment had xylem with higher hydraulic resistances in the peduncle and pedicel segments on both sides of the AZ, while the largest increase in hydraulic resistance was measured in the AZ. During fruit development hydraulic resistances in peduncle and pedicel segments decreased on both sides of the AZ, but tended to increase in the AZ. The overall xylem hydraulic resistance between the shoot and fruit tended to increase with fruit development because of the dominating role of the hydraulic resistance in the AZ. It is discussed whether the xylem hydraulic resistance in the AZ of tomato pedicels in response to water stress and during fruit development contributes to the hydraulic isolation of fruits from diurnal cycles of water stress in the shoot.
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Claims 6
Claim · model-written summary
In tomato, xylem hydraulic resistance was largest in the abscission zone.
- Taxon
- tomato
Solanum lycopersicumt0 - Organ / stage
- AZe1
- Outcome
- resistancese1
- Direction
- largeste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e1“by far the largest resistances were measured in the AZ where most individual vessels ended”
Claim · model-written summary
Low water availability in the root environment raised xylem hydraulic resistance in tomato peduncle and pedicel segments.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- peduncle and pedicel segmentse2
- Treatment
- low water availability in the root environmente2
- Outcome
- hydraulic resistancese2
- Direction
- highere2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e2“Plants grown at low water availability in the root environment had xylem with higher hydraulic resistances in the peduncle and pedicel segments on both sides of the AZ, while the largest increase in hydraulic resistance was measured in the AZ”
Claim · model-written summary
Low water availability in the root environment produced the largest increase in xylem hydraulic resistance in the tomato abscission zone.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- AZe2
- Treatment
- low water availability in the root environmente2
- Outcome
- increase in hydraulic resistancee2
- Direction
- increasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e2“Plants grown at low water availability in the root environment had xylem with higher hydraulic resistances in the peduncle and pedicel segments on both sides of the AZ, while the largest increase in hydraulic resistance was measured in the AZ”
Claim · model-written summary
During fruit development, xylem hydraulic resistance in tomato peduncle and pedicel segments decreased.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- peduncle and pedicel segmentse3
- Outcome
- hydraulic resistancese3
- Direction
- decreasede3
- Qualifier
- During fruit developmente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e3“During fruit development hydraulic resistances in peduncle and pedicel segments decreased on both sides of the AZ, but tended to increase in the AZ”
Claim · model-written summary
During fruit development, xylem hydraulic resistance in the tomato abscission zone tended to increase.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- AZe3
- Outcome
- hydraulic resistancese3
- Direction
- tended to increasee3
- Qualifier
- During fruit developmente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e3“During fruit development hydraulic resistances in peduncle and pedicel segments decreased on both sides of the AZ, but tended to increase in the AZ”
Claim · model-written summary
The overall xylem hydraulic resistance between shoot and fruit in tomato tended to increase with fruit development.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- overall xylem hydraulic resistance between the shoot and fruite4
- Direction
- tended to increasee4
- Qualifier
- with fruit developmente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato”
e4“The overall xylem hydraulic resistance between the shoot and fruit tended to increase with fruit development because of the dominating role of the hydraulic resistance in the AZ”
The same questions in other papers
climate site · disease · Solanum lycopersicum (tomato)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →soil water · disease · Solanum lycopersicum (tomato)Results agree
3 papers in the same direction as this paper
- negative
- no effect
- negative
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.