Abstract
The leaf mass per unit leaf area (LMA) is a key variable in many growth models, since it is often used to predict leaf area expansion from leaf dry weight increase, or ice ersa. Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops. The source-sink balance was manipulated by artificial shading, CO # enrichment or fruit removal using different tomato cultivars. Leaf area was hardly affected by competition for assimilates except under extreme conditions. In contrast, leaf dry weight, and consequently LMA, underwent large and rapid fluctuations in response to any factor that changed source and sink activities. A 60 % reduction of photosynthetically active radiation involved a 24 % decrease in LMA after 10 d. Carbon dioxide enrichment and fruit removal induced about a 45 % and 15 % increase in LMA, respectively, on plants with two fruiting trusses, but hardly affected LMA of producing plants. No significant cultivar effect could be identified. Changes in starch and soluble sugar content in leaves accounted for only 29 % of diurnal variations in LMA, suggesting regular fluctuations of other components. We propose that structural LMA varies between a maximum and a minimum value according to the ratio of assimilate supply and demand during leaf development. Leaf area is independent of the supply of assimilates when the minimum structural LMA is realised. When the maximum structural LMA is attained, a storage pool of assimilates may accumulate in leaves during periods of high supply and low demand. We present a model including these hypotheses, which predicts structural and non-structural LMA variations of plants with different source-sink ratios.
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Claims 13
Claim · model-written summary
A 60 % reduction of photosynthetically active radiation decreased LMA by 24 % after 10 d in tomato.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- A 60 % reduction of photosynthetically active radiatione1
- Outcome
- LMAe1
- Direction
- decreasee1
- Value
- 24 %e1
- Qualifier
- after 10 de1
- Setting
- glasshousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e1“A 60 % reduction of photosynthetically active radiation involved a 24 % decrease in LMA after 10 d”
Claim · model-written summary
Carbon dioxide enrichment increased LMA by about 45 % in tomato plants with two fruiting trusses.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Carbon dioxide enrichmente2
- Outcome
- LMAe2
- Direction
- increasee2
- Value
- about a 45 %e2
- Qualifier
- on plants with two fruiting trussese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e2“Carbon dioxide enrichment and fruit removal induced about a 45 % and 15 % increase in LMA, respectively, on plants with two fruiting trusses, but hardly affected LMA of producing plants”
Claim · model-written summary
Fruit removal increased LMA by 15 % in tomato plants with two fruiting trusses.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- fruit removale2
- Outcome
- LMAe2
- Direction
- increasee2
- Value
- 15 %e2
- Qualifier
- on plants with two fruiting trussese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e2“Carbon dioxide enrichment and fruit removal induced about a 45 % and 15 % increase in LMA, respectively, on plants with two fruiting trusses, but hardly affected LMA of producing plants”
Claim · model-written summary
Carbon dioxide enrichment hardly affected LMA of producing tomato plants.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Carbon dioxide enrichmente2
- Outcome
- LMAe2
- Direction
- no_changeinferrede2
- Qualifier
- of producing plantse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e2“Carbon dioxide enrichment and fruit removal induced about a 45 % and 15 % increase in LMA, respectively, on plants with two fruiting trusses, but hardly affected LMA of producing plants”
Claim · model-written summary
Fruit removal hardly affected LMA of producing tomato plants.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- fruit removale2
- Outcome
- LMAe2
- Direction
- no_changeinferrede2
- Qualifier
- of producing plantse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e2“Carbon dioxide enrichment and fruit removal induced about a 45 % and 15 % increase in LMA, respectively, on plants with two fruiting trusses, but hardly affected LMA of producing plants”
Claim · model-written summary
Leaf area of tomato was hardly affected by competition for assimilates except under extreme conditions.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- competition for assimilatese3
- Outcome
- Leaf areae3
- Direction
- no_changeinferrede3
- Qualifier
- except under extreme conditionse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e3“Leaf area was hardly affected by competition for assimilates except under extreme conditions”
Claim · model-written summary
Leaf dry weight, and consequently LMA, of tomato underwent large and rapid fluctuations in response to any factor that changed source and sink activities.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- any factor that changed source and sink activitiese4
- Outcome
- leaf dry weight, and consequently LMAe4
- Qualifier
- large and rapid fluctuationse4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e4“In contrast, leaf dry weight, and consequently LMA, underwent large and rapid fluctuations in response to any factor that changed source and sink activities”
Claim · model-written summary
Changes in starch and soluble sugar content in tomato leaves accounted for only 29 % of diurnal variations in LMA.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leavese5
- Compound
- starch and soluble sugare5
- Outcome
- diurnal variations in LMAe5
- Value
- 29 %e5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e5“Changes in starch and soluble sugar content in leaves accounted for only 29 % of diurnal variations in LMA”
Claim · model-written summary
Structural LMA of tomato is proposed to vary between a maximum and a minimum value according to the ratio of assimilate supply and demand during leaf development.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leaf developmente6
- Outcome
- structural LMAe6
- Qualifier
- according to the ratio of assimilate supply and demand during leaf developmente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e6“We propose that structural LMA varies between a maximum and a minimum value according to the ratio of assimilate supply and demand during leaf development”
Claim · model-written summary
Leaf area of tomato is proposed to be independent of assimilate supply when the minimum structural LMA is realised.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- Leaf areae7
- Qualifier
- independent of the supply of assimilates when the minimum structural LMA is realisede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e7“Leaf area is independent of the supply of assimilates when the minimum structural LMA is realised”
Claim · model-written summary
A storage pool of assimilates is proposed to accumulate in tomato leaves when the maximum structural LMA is attained.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leavese1
- Outcome
- storage pool of assimilatese1
- Qualifier
- When the maximum structural LMA is attainede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e1“When the maximum structural LMA is attained, a storage pool of assimilates may accumulate in leaves during periods of high supply and low demand”
Claim · model-written summary
A model predicts structural and non-structural LMA variations of plants with different source-sink ratios.
Verbatim
e1“We present a model including these hypotheses, which predicts structural and non-structural LMA variations of plants with different source-sink ratios”
Claim · model-written summary
No significant cultivar effect on tomato LMA could be identified.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- cultivar effecte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influences of source-sink balance on leaf area, leaf dry weight, LMA, and leaf content in non-structural carbohydrates were investigated in glasshouse tomato crops”
e1“No significant cultivar effect could be identified”
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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.