Abstract
Muskmelon (Cucumis melo L.) fruit lack a stored starch reserve and therefore depend on translocated photoassimilate from the leaf canopy for sugar accumulation during ripening. The influence of canopy photosynthesis on sucrose' accumulation within muskmelon fruit mesocarp was examined. Canopy photosynthetic activities were estimated in a sweet and a nonsweet genotype. Photosynthetic rate of the nonsweet genotype, on a per-plant basis, was only 56% of that of the sweet genotype. The effect of limiting leaf area of the sweet genotype on carbohydrate concentrations and sucrose metabolizing enzymes within the fruit was evaluated. A 50% reduction of leaf area 8 days before initiation of fruit sucrose accumulation resulted in canopy photosynthesis similar to that of the nonsweet genotype. Reduced photosynthetic activity resulted in slightly lower soluble-carbohydrate concentration in the fruit; however, fruit sucrose concentration was three times higher than that reported previously for the nonsweet genotype. The extent to which `fruit sucrose phosphate synthase (SPS) activity increased during maturation was diminished by leaf removal. Acid invertase activity declined in all fruit in a similar manner irrespective of defoliation. A reduction of leaf area of a sweet genotype reduced sucrose accumulation within the fruit. Lower fruit sucrose concentration was associated with lower concentration of raffinose saccharides and lower SPS activity within the fruit. Additionally, insufficient assimilate supply was judged not to be the factor responsible for low sucrose accumulation in a nonsweet genotype.
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Claims 10
Claim · model-written summary
The nonsweet genotype had 56% of the sweet genotype photosynthetic rate per plant.
- Taxon
- Muskmelon
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Cucumis melot0 - Material
- nonsweet genotypee0
- Outcome
- Photosynthetic ratee0
- Direction
- onlye0
- Value
- 56%e0
- Comparator
- sweet genotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Photosynthetic rate of the nonsweet genotype, on a per-plant basis, was only 56% of that of the sweet genotype”
t0“Muskmelon”
Claim · model-written summary
Halving leaf area before fruit sucrose accumulation made canopy photosynthesis similar to the nonsweet genotype.
- Taxon
- MuskmelonCucumis melot0
- Treatment
- 50% reduction of leaf areae0
- Outcome
- canopy photosynthesise0
- Direction
- similare0
- Value
- 50%e0
- Qualifier
- 8 days before initiation of fruit sucrose accumulatione0
- Comparator
- nonsweet genotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 50% reduction of leaf area 8 days before initiation of fruit sucrose accumulation resulted in canopy photosynthesis similar to that of the nonsweet genotype”
t0“Muskmelon”
Claim · model-written summary
Reduced photosynthetic activity slightly lowered soluble carbohydrate concentration in fruit.
- Taxon
- MuskmelonCucumis melot0
- Treatment
- Reduced photosynthetic activitye0
- Outcome
- soluble-carbohydrate concentration in the fruite0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced photosynthetic activity resulted in slightly lower soluble-carbohydrate concentration in the fruit”
t0“Muskmelon”
Claim · model-written summary
Fruit sucrose concentration was three times higher than previously reported for the nonsweet genotype.
- Taxon
- MuskmelonCucumis melot0
- Outcome
- fruit sucrose concentratione0
- Direction
- highere0
- Value
- three timese0
- Comparator
- nonsweet genotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fruit sucrose concentration was three times higher than that reported previously for the nonsweet genotype”
t0“Muskmelon”
Claim · model-written summary
Leaf removal diminished the increase in fruit sucrose phosphate synthase activity during maturation.
- Taxon
- MuskmelonCucumis melot0
- Organ / stage
- during maturatione0
- Treatment
- leaf removale0
- Outcome
- fruit sucrose phosphate synthase (SPS) activitye0
- Direction
- diminishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extent to which `fruit sucrose phosphate synthase (SPS) activity increased during maturation was diminished by leaf removal”
t0“Muskmelon”
Claim · model-written summary
Acid invertase activity declined similarly in all fruit regardless of defoliation.
- Taxon
- MuskmelonCucumis melot0
- Treatment
- defoliatione0
- Outcome
- Acid invertase activitye0
- Direction
- declinede0
- Comparator
- all fruite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acid invertase activity declined in all fruit in a similar manner irrespective of defoliation”
t0“Muskmelon”
Claim · model-written summary
Reducing leaf area reduced sucrose accumulation within sweet genotype fruit.
- Taxon
- MuskmelonCucumis melot0
- Material
- sweet genotypee0
- Treatment
- reduction of leaf areae0
- Outcome
- sucrose accumulation within the fruite0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A reduction of leaf area of a sweet genotype reduced sucrose accumulation within the fruit”
t0“Muskmelon”
Claim · model-written summary
Lower fruit sucrose concentration was associated with lower raffinose saccharide concentration.
- Taxon
- MuskmelonCucumis melot0
- Compound
- raffinose saccharidese0
- Outcome
- fruit sucrose concentratione0
- Direction
- Lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower fruit sucrose concentration was associated with lower concentration of raffinose saccharides”
t0“Muskmelon”
Claim · model-written summary
Lower fruit sucrose concentration was associated with lower SPS activity.
- Taxon
- MuskmelonCucumis melot0
- Gene
- SPSe0
- Outcome
- fruit sucrose concentratione0
- Direction
- Lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower fruit sucrose concentration was associated with lower concentration of raffinose saccharides and lower SPS activity within the fruit”
t0“Muskmelon”
Claim · model-written summary
Insufficient assimilate supply was judged not to explain low sucrose accumulation in the nonsweet genotype.
- Taxon
- MuskmelonCucumis melot0
- Material
- nonsweet genotypee0
- Outcome
- low sucrose accumulatione0
- Qualifier
- insufficient assimilate supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“insufficient assimilate supply was judged not to be the factor responsible for low sucrose accumulation in a nonsweet genotype”
t0“Muskmelon”
The same questions in other papers
pruning · molecular: metabolites · Cucumis melo (muskmelon)Positive and negative results
3 papers in the same direction as this paper · 4 in the opposite direction
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4 papers more in this group
See all 8 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.