Abstract
ABSTRACT Seed number is the primary yield component in soybean [ Glycine max (L.) Merrill], but the mechanisms responsible for the regulation of this component are not fully understood. Three soybean cultivars (Elgin 87, Emerald, and Essex) with genetic differences in seed growth rate and seed size were grown in the field in 1995 and 1996 to determine the relationship between photosynthesis, sink characteristics, and seed number at individual nodes. The sixth node from the bottom of the main stem was isolated by heat girdling the stem below the node to disrupt phloem continuity and by removing the part of the plant above the girdled node when flowers first opened at this node. Photosynthesis was varied by defoliating (removing approximately 0, 33, 66, 83, or 100% of the leaf area) the leaf at the girdled node. Carbon dioxide exchange rate (CER) was measured at approximately weekly intervals for up to 40 d after girdling. Girdling temporarily reduced CER in four of six comparisons and defoliation tended to increase CER. Defoliation produced large differences in nodal carbon input (NCI) per node and seed number increased rapidly as average NCI per node increased from 0 to approximately 0.10 μmol CO 2 node −1 s −2 However, there was no further increase in seed number as average NCI continued to increase to 0.5 μmol CO 2 node −1 s −2 , suggesting that isolated nodes respond differently than soybean communities. Maximum seed number per node was inversely related to cultivar differences in individual seed growth rate and seed size. The girdled node technique should prove useful to investigate seed number‐photosynthesis relationships in soybean.
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Claims 7
Claim · model-written summary
Girdling temporarily lowered carbon dioxide exchange rate in four of six comparisons.
- Taxon
- soybean
Glycine maxt1 - Treatment
- Girdlinge0
- Outcome
- CERe0
- Direction
- reducede0
- Value
- four of six comparisonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Girdling temporarily reduced CER in four of six comparisons”
t1“Soybean”
Claim · model-written summary
Defoliation tended to raise carbon dioxide exchange rate.
- Taxon
- soybeanGlycine maxt1
- Treatment
- defoliatione0
- Outcome
- CERe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“defoliation tended to increase CER.”
t1“Soybean”
Claim · model-written summary
Defoliation produced large variation in nodal carbon input.
- Taxon
- soybeanGlycine maxt1
- Treatment
- Defoliatione0
- Outcome
- nodal carbon input (NCI) per nodee0
- Direction
- large differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation produced large differences in nodal carbon input (NCI) per node”
t1“Soybean”
Claim · model-written summary
Seed number rose rapidly as average nodal carbon input increased to about 0.10 micromoles.
- Taxon
- soybeanGlycine maxt1
- Outcome
- seed numbere0
- Direction
- increasede0
- Value
- 0.10 μmol CO 2 node −1 s −2e0
- Comparator
- average NCI per nodee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed number increased rapidly as average NCI per node increased from 0 to approximately 0.10 μmol CO 2 node −1 s −2”
t1“Soybean”
Claim · model-written summary
Seed number did not rise further as nodal carbon input increased to 0.5 micromoles.
- Taxon
- soybeanGlycine maxt1
- Outcome
- seed numbere0
- Direction
- no further increasee0
- Value
- 0.5 μmol CO 2 node −1 s −2e0
- Comparator
- average NCIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no further increase in seed number as average NCI continued to increase to 0.5 μmol CO 2 node −1 s −2”
t1“Soybean”
Claim · model-written summary
Maximum seed number per node was inversely related to cultivar differences in individual seed growth rate and size.
- Taxon
- soybeanGlycine maxt1
- Material
- cultivar differencese0
- Outcome
- Maximum seed number per nodee0
- Direction
- inversely relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum seed number per node was inversely related to cultivar differences in individual seed growth rate and seed size.”
t1“Soybean”
Claim · model-written summary
The girdled node technique was recommended for studying seed number and photosynthesis.
- Taxon
- soybeanGlycine maxe0
- Outcome
- girdled node technique should prove usefule0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The girdled node technique should prove useful to investigate seed number‐photosynthesis relationships in soybean.”
The same questions in other papers
pruning · molecular: metabolites · Glycine max (soybean)Positive and negative results
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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.