Abstract
The carbohydrate status of a soybean [ Glycine max (L.) Merrill] leaf during reproductive growth is related to the interaction between the production of carbohydrate by photosynthesis and its utilltation by the developing seeds and other active sinks. This interaction between source and sink plays an important role in the production of yield. Leaf samples were collected from field grown soybeans, ‘Cutler 71,’for 3 years to investigate changes in levels of free sugars and starch during reproductive growth. Shade cloth that reduced the incident solar radiation by 60% was installed over plants at the beginning of the seed filling period for 2 years and leaf samples were collected from the 6th and/or 12th leaf position at weekly intervals. Changes in free sugar levels in the leaves during seed filling varied from an increase to no change to a decrease across the $ years. Starch leveis increased to a maximum and, in 2 of the 3 years, declined as the plant approached maturity. The increase in starch was associated with an increase in specific leaf weight. Leaves that were ready to abscise contained up to 8.5% starch. Shading reduced yield (19 to 32%) but had no effect the level of free sugars in the leaves. However, the shade caused an immediate reduction (within 5 to 8 days) the concentration of starch, to 13 to 28% below the control, and this difference in concentration was maintained throughout the remainder of the filling period. Although soybean leaves accumulate starch during the seed filling period, some of the starch is remobili~ed prior to leaf abscission and the amount in the abseised leaves does not represent a significant quantity relative to the seed yield.
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Claims 8
Claim · model-written summary
Leaf free sugars varied from an increase to no change to a decrease among years during seed filling.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- leavese0
- Outcome
- free sugar levels in the leavese0
- Direction
- varied from an increase to no change to a decreasee0
- Qualifier
- during seed fillinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in free sugar levels in the leaves during seed filling varied from an increase to no change to a decrease across the $ years.”
t0“soybean”
Claim · model-written summary
Leaf starch increased to a maximum and then declined near maturity in two of three years.
- Taxon
- soybeanGlycine maxt0
- Outcome
- Starch leveise0
- Direction
- increased to a maximume0
- Qualifier
- in 2 of the 3 yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Starch leveis increased to a maximum and, in 2 of the 3 years, declined as the plant approached maturity.”
t0“soybean”
Claim · model-written summary
Increasing starch was associated with increasing specific leaf weight.
- Taxon
- soybeanGlycine maxt0
- Compound
- starche0
- Outcome
- specific leaf weighte0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in starch was associated with an increase in specific leaf weight.”
t0“soybean”
Claim · model-written summary
Leaves near abscission contained up to 8.5% starch.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- Leaves that were ready to abscisee0
- Outcome
- starche0
- Value
- 8.5%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves that were ready to abscise contained up to 8.5% starch.”
t0“soybean”
Claim · model-written summary
Shading reduced yield by 19 to 32%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading reduced yield (19 to 32%) but had no effect the level of free sugars in the leaves.”
t0“soybean”
Claim · model-written summary
Shading did not affect leaf free sugar levels.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Shadinge0
- Outcome
- level of free sugars in the leavese0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading reduced yield (19 to 32%) but had no effect the level of free sugars in the leaves.”
t0“soybean”
Claim · model-written summary
Shade rapidly reduced starch concentration below the control and this difference persisted.
- Taxon
- soybeanGlycine maxt0
- Treatment
- the shadee0
- Outcome
- concentration of starche0
- Direction
- reductione0
- Value
- 13 to 28%e0
- Qualifier
- within 5 to 8 dayse0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shade caused an immediate reduction (within 5 to 8 days) the concentration of starch, to 13 to 28% below the control, and this difference in concentration was maintained throughout the remainder of the filling period.”
t0“soybean”
Claim · model-written summary
Some leaf starch was remobilized before abscission, with little quantity relative to seed yield.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- leafe0
- Outcome
- starch is remobili~ede0
- Qualifier
- relative to the seed yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some of the starch is remobili~ed prior to leaf abscission and the amount in the abseised leaves does not represent a significant quantity relative to the seed yield.”
t0“soybean”
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See all 11 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.