Abstract
To examine the physiological role of hexose transporters in determining the sink strength of individual fruits, the regulation of hexose transporters gene expression was studied when the sink/source ratio was artificially altered under the greenhouse condition; this was done in two cultivars of tomato, i.e. Grandella and Isabella. The sink/source ratio treatments included: saving one fruit per truss (1F), two fruits per truss (2F), three fruits per truss (3F) and no fruit pruning (control). The results showed that fruit thinning could increase starch, sucrose, and hexose contents in the fruits; it could also modulate the activity of the key enzymes and the expression of tomato hexose transporter genes (LeHTs). Based on the relative transcript levels, all examined LeHTs were unregulated at the end of cell division and the cell expansion stage of fruit development, but the strongest expression level observed at the onset of ripening was related to LeHT1 and LeHT2. Given the concomitancy of cell wall invertase (EC 3.2.1.26) activity and the LeHTs relative expression cell wall, invertase activity seemed to be involved in the expression level of LeHTs. The increased trends of the LeHTs expression with the decrease of the sink/source ratio confirmed the role of hexose transporters in determining the sink strength of the tomato fruits.
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Claims 7
Claim · model-written summary
Fruit thinning could increase starch, sucrose and hexose contents in tomato fruits compared with no fruit pruning.
- Taxon
- tomato
Solanum lycopersicumt0 - Material
- Grandella and Isabellae0
- Treatment
- fruit thinninge2
- Outcome
- starch, sucrose, and hexose contentse2
- Direction
- could increasee2
- Comparator
- no fruit pruning (control)e1
- Setting
- greenhouset0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“greenhouse tomatoes”
e0“two cultivars of tomato, i.e. Grandella and Isabella”
e1“The sink/source ratio treatments included: saving one fruit per truss (1F), two fruits per truss (2F), three fruits per truss (3F) and no fruit pruning (control)”
e2“fruit thinning could increase starch, sucrose, and hexose contents in the fruits”
Claim · model-written summary
Fruit thinning could modulate the activity of key enzymes in tomato fruits compared with no fruit pruning.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- fruit thinninge2
- Outcome
- activity of the key enzymese3
- Direction
- modulatee3
- Comparator
- no fruit pruning (control)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“greenhouse tomatoes”
e1“The sink/source ratio treatments included: saving one fruit per truss (1F), two fruits per truss (2F), three fruits per truss (3F) and no fruit pruning (control)”
e2“fruit thinning could increase starch, sucrose, and hexose contents in the fruits”
e3“it could also modulate the activity of the key enzymes and the expression of tomato hexose transporter genes (LeHTs)”
Claim · model-written summary
Fruit thinning could modulate the expression of LeHT hexose transporter genes in tomato fruits compared with no fruit pruning.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- fruit thinninge2
- Gene
- LeHTse3
- Outcome
- expressione3
- Direction
- modulatee3
- Comparator
- no fruit pruning (control)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“greenhouse tomatoes”
e1“The sink/source ratio treatments included: saving one fruit per truss (1F), two fruits per truss (2F), three fruits per truss (3F) and no fruit pruning (control)”
e2“fruit thinning could increase starch, sucrose, and hexose contents in the fruits”
e3“it could also modulate the activity of the key enzymes and the expression of tomato hexose transporter genes (LeHTs)”
Claim · model-written summary
All examined LeHTs were unregulated across the end of cell division and cell expansion stages of fruit development.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- the end of cell division and the cell expansion stage of fruit developmente4
- Gene
- LeHTse4
- Outcome
- relative transcript levelse4
- Direction
- unregulatede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“greenhouse tomatoes”
e4“Based on the relative transcript levels, all examined LeHTs were unregulated at the end of cell division and the cell expansion stage of fruit development”
Claim · model-written summary
The strongest LeHT1 and LeHT2 expression was observed at the onset of ripening.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- onset of ripeninge5
- Gene
- LeHT1 and LeHT2e5
- Outcome
- expression levele5
- Direction
- strongeste5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“greenhouse tomatoes”
e5“the strongest expression level observed at the onset of ripening was related to LeHT1 and LeHT2”
Claim · model-written summary
Invertase activity may be involved in the expression level of LeHTs in tomato fruits.
- Taxon
- tomatoSolanum lycopersicumt0
- Gene
- invertasee6
- Outcome
- expression levele6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“greenhouse tomatoes”
e6“invertase activity seemed to be involved in the expression level of LeHTs”
Claim · model-written summary
LeHT expression increased as the sink/source ratio decreased.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- decrease of the sink/source ratioe7
- Gene
- LeHTse7
- Outcome
- LeHTs expressione7
- Direction
- increased trendse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“greenhouse tomatoes”
e7“The increased trends of the LeHTs expression with the decrease of the sink/source ratio confirmed the role of hexose transporters”
The same questions in other papers
pruning · quality: sugar starch · Solanum lycopersicum (tomato)Positive and negative results
8 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
9 papers more in this group
See all 13 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.