Abstract
Field experiments using two soybean ( Glycine max L. Merrill) cultivars (‘Elgin 87’ and ‘Essex’) were conducted for 2 years near Lexington, KY, USA to evaluate the effect of source-sink alterations on seed carbohydrate status and growth. Sucrose concentrations in developing cotyledons of control plants were consistently low (<50 m M ) early in seed development, but they increased to 100–150 m M by physiological maturity. The concentrations increased in both years by 47 to 59% when 90% of the pods were removed from ‘Elgin 87’, but the increase had no effect on individual seed growth rate (SGR). Shading (80%) reduced cotyledon sucrose levels and SGR in both years. The critical cotyledon sucrose concentration (the concentration providing 80% of the maximum cotyledon growth rate) was estimated from in vitro cotyledon growth at sucrose concentrations of 0–200 m M . These critical concentrations varied from 72–124 m M ; in planta control cotyledon sucrose concentrations were below this critical level during the first half of seed growth but exceeded it in the later stages of growth in all experiments. The estimated critical concentration was consistent with the failure of in planta SGR to respond to an increase in assimilate supply and with the reduction in SGR associated with a decrease in assimilate supply. The results suggest that soybean SGR is generally sink limited if photosynthesis increases during seed filling, but source limited if photosynthesis is reduced. Copyright 2001 Annals of Botany Company
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Claims 7
Claim · model-written summary
Control cotyledon sucrose rose from below 50 m M early to 100–150 m M at physiological maturity.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- developing cotyledonse0
- Outcome
- Sucrose concentrationse0
- Direction
- increasede0
- Value
- 100–150 m Me0
- Qualifier
- early in seed developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sucrose concentrations in developing cotyledons of control plants were consistently low (<50 m M ) early in seed development, but they increased to 100–150 m M by physiological maturity.”
t0“Soybean”
Claim · model-written summary
Removing 90% of pods increased cotyledon sucrose by 47 to 59% in Elgin 87.
- Taxon
- soybeanGlycine maxt0
- Material
- ‘Elgin 87’e0
- Treatment
- 90% of the pods were removede0
- Outcome
- concentrationse0
- Direction
- increasede0
- Value
- 47 to 59%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentrations increased in both years by 47 to 59% when 90% of the pods were removed from ‘Elgin 87’,”
t0“Soybean”
Claim · model-written summary
The increase in assimilate supply did not affect individual seed growth rate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasee0
- Outcome
- individual seed growth ratee0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but the increase had no effect on individual seed growth rate (SGR).”
t0“Soybean”
Claim · model-written summary
Shading reduced cotyledon sucrose and seed growth rate in both years.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Shading (80%)e0
- Outcome
- cotyledon sucrose levels and SGRe0
- Direction
- reducede0
- Qualifier
- in both yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading (80%) reduced cotyledon sucrose levels and SGR in both years.”
t0“Soybean”
Claim · model-written summary
Critical cotyledon sucrose concentrations ranged from 72–124 m M.
- Taxon
- soybeanGlycine maxt0
- Outcome
- critical concentrationse0
- Value
- 72–124 m Me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These critical concentrations varied from 72–124 m M ;”
t0“Soybean”
Claim · model-written summary
Control cotyledon sucrose was below the critical level in early seed growth and above it later.
- Taxon
- soybeanGlycine maxt0
- Outcome
- control cotyledon sucrose concentrationse0
- Qualifier
- during the first half of seed growth but exceeded it in the later stages of growthe0
- Comparator
- this critical levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in planta control cotyledon sucrose concentrations were below this critical level during the first half of seed growth but exceeded it in the later stages of growth in all experiments.”
t0“Soybean”
Claim · model-written summary
Soybean seed growth rate was interpreted as sink limited when photosynthesis rises and source limited when it falls.
- Taxon
- soybeanGlycine maxe0
- Outcome
- soybean SGRe0
- Qualifier
- sink limited if photosynthesis increases during seed filling, but source limited if photosynthesis is reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest that soybean SGR is generally sink limited if photosynthesis increases during seed filling, but source limited if photosynthesis is reduced.”
The same questions in other papers
shade · growth · Glycine max (soybean)Results differ
25 papers in the same direction as this paper · 12 in the opposite direction
- negative
- negative
- positive
34 papers more in this group
See all 38 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.