Abstract
Tomato (Lycopersicon esculentum cv. Solairo) fruit growth, fruit mesocarp and leaf epidermal cell turgor, and fruit and leaf sub-epidermal apoplastic pH were monitored as plants were allowed to dry the soil in which they were rooted. Soil drying regimes involved splitting the root system of plants between two halves of a single pot separated by a solid impervious membrane to form a split-root system. Plants were then allowed to dry the soil in both halves of the pot (a soil-drying (SD) treatment) or water was supplied to one-half of the pot (a partial root-drying (PRD) treatment), allowing only one-half of the root system to dry the soil. A well-watered control treatment watered the soil on both halves of the pot. The rate of fruit growth was highly correlated with the soil water content of both sides of the SD treatment and the dry side of the PRD treatment. Soil drying caused a significant restriction in fruit growth rate, which was independent of any changes in the turgor of expanding fruit mesocarp cells in the PRD treatment. By supplying water to half of the root system, the turgors of mesocarp cells were maintained at values above those recorded in well-watered controls. The turgor of leaf epidermal cells exhibited a similar response. The pH of the sub-epidermal apoplastic compartment in leaves and fruit increased with soil drying. The dynamics of this increase in leaves and fruit were identical, suggesting free transport of this signal from shoot to fruit. Fruit growth rate and sub-epidermal pH within the fruit showed a strong correlation. The similarity of fruit growth response in the SD and PRD treatment, suggests that tomato plants respond to a discrete measure of soil water status and do not integrate measures to determine total soil water availability. The results of this study are not consistent with Lockhartian models of growth regulation in expanding fruit of a higher plant. A non-hydraulic, chemical-based signalling control of fruit growth in plants growing in drying soil is proposed.
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Claims 9
Claim · model-written summary
Rate of tomato fruit growth was positively correlated with soil water content on both sides of the soil-drying treatment and the dry side of partial root-drying.
- Taxon
- Tomato
Solanum lycopersicume0 - Organ / stage
- fruite1
- Outcome
- rate of fruit growthe1
- Direction
- increaseinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato (Lycopersicon esculentum cv. Solairo) fruit growth”
e1“The rate of fruit growth was highly correlated with the soil water content of both sides of the SD treatment and the dry side of the PRD treatment”
Claim · model-written summary
Soil drying significantly restricted tomato fruit growth rate, independently of changes in mesocarp cell turgor.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- Soil dryinge2
- Outcome
- fruit growth ratee2
- Direction
- restrictione2
- Qualifier
- independent of any changes in the turgor of expanding fruit mesocarp cellse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato (Lycopersicon esculentum cv. Solairo) fruit growth”
e2“Soil drying caused a significant restriction in fruit growth rate, which was independent of any changes in the turgor of expanding fruit mesocarp cells in the PRD treatment”
Claim · model-written summary
Supplying water to half of the root system maintained fruit mesocarp cell turgor above well-watered control values.
- Taxon
- TomatoSolanum lycopersicume0
- Organ / stage
- mesocarp cellse3
- Treatment
- supplying water to half of the root systeme3
- Outcome
- turgors of mesocarp cellse3
- Direction
- maintained at values abovee3
- Comparator
- well-watered controlse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato (Lycopersicon esculentum cv. Solairo) fruit growth”
e3“By supplying water to half of the root system, the turgors of mesocarp cells were maintained at values above those recorded in well-watered controls”
Claim · model-written summary
Leaf epidermal cell turgor showed a response similar to that of fruit mesocarp cells when half the root system was watered.
- Taxon
- TomatoSolanum lycopersicume0
- Organ / stage
- leaf epidermal cellse4
- Treatment
- supplying water to half of the root systeme3
- Outcome
- turgor of leaf epidermal cellse4
- Direction
- increaseinferrede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato (Lycopersicon esculentum cv. Solairo) fruit growth”
e3“By supplying water to half of the root system, the turgors of mesocarp cells were maintained at values above those recorded in well-watered controls”
e4“The turgor of leaf epidermal cells exhibited a similar response”
Claim · model-written summary
Soil drying increased sub-epidermal apoplastic pH in tomato leaves and fruit.
- Taxon
- TomatoSolanum lycopersicume0
- Organ / stage
- leaves and fruite5
- Treatment
- soil dryinge5
- Outcome
- pH of the sub-epidermal apoplastic compartmente5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato (Lycopersicon esculentum cv. Solairo) fruit growth”
e5“The pH of the sub-epidermal apoplastic compartment in leaves and fruit increased with soil drying”
Claim · model-written summary
Fruit growth rate and sub-epidermal pH within the tomato fruit were strongly and positively correlated.
- Taxon
- TomatoSolanum lycopersicume0
- Organ / stage
- fruite6
- Outcome
- Fruit growth rate and sub-epidermal pHe6
- Direction
- increaseinferrede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato (Lycopersicon esculentum cv. Solairo) fruit growth”
e6“Fruit growth rate and sub-epidermal pH within the fruit showed a strong correlation”
Claim · model-written summary
A non-hydraulic, chemical-based signalling control of fruit growth is proposed for tomato plants in drying soil.
- Taxon
- TomatoSolanum lycopersicume0
- Outcome
- fruit growthe7
- Qualifier
- non-hydraulic, chemical-based signallinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato (Lycopersicon esculentum cv. Solairo) fruit growth”
e7“A non-hydraulic, chemical-based signalling control of fruit growth in plants growing in drying soil is proposed”
Claim · model-written summary
Tomato plants respond to a discrete measure of soil water status rather than integrating total soil water availability.
- Taxon
- tomatoSolanum lycopersicume7
- Outcome
- respond to a discrete measure of soil water statuse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“tomato plants respond to a discrete measure of soil water status and do not integrate measures to determine total soil water availability”
Claim · model-written summary
The results of tomato fruit growth were not consistent with Lockhartian models of growth regulation.
- Taxon
- TomatoSolanum lycopersicume0
- Outcome
- not consistent with Lockhartian models of growth regulatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato (Lycopersicon esculentum cv. Solairo) fruit growth”
e6“The results of this study are not consistent with Lockhartian models of growth regulation in expanding fruit of a higher plant”
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