Abstract
To determine the importance of long distance translocation to the yield of soybeans ( Glycine max L. Merrill), field‐grown plants were modified by selective pruning to create an imbalance in the number of leaves and the number of pods on opposing branches of a Y‐shaped plant. The Y‐shaped plants were created early in vegetative growth by pinching off the growing apex when the first trifoliolate leaf appeared. After flowering, one group of these Y‐shaped plants was pruned by removing one‐third of the leaflets and one‐third of the pods from both branches (the even treatment), another group was pruned by removing two‐thirds of the leaflets from one branch and two‐thirds of the pods from the opposite branch (the uneven treatment). Plants given the even and uneven treatment were labelled with 14 CO 2 on three occasions corresponding to days early, middle, and late in pod‐filling. After 24 h, labelled plants were harvested, dried, and the specific radioactivity in each part and the distribution of radioactivity in the various parts of the plant were determined. Some of the labelled plants were allowed to mature before harvest and analysis. The changed leaf area of the treatments remained to the end of the season, but the changed pod distribution did not. Increased abortion of pods and seeds on the deleafed branch and decreased abortion on the depodded branch of the uneven treatment equalized the reproductive load on all the pruned branches during most of the pod‐filling period. The pruning had no effect on photosynthesis per unit leaf area, as measured by assimilation of 14 CO 2 , or on the rate of disappearance of radioactivity from leaves in the first few hours after labelling. Moreover, the movement of the radioactivity out of the leaf or into the seed was unaffected. The uneven treatment did induce a change in the amount of photosynthate retained in the stem of the two different branches; the depodded stem retained twice the radioactivity of the deleafed stem after 24 h. The difference in radioactivity in the stems of different treatments noted 24 h after labelling was also found at the end of the season, though the level of radioactivity was reduced by a factor of 2. The resistance to translocation is sufficient to alter the distribution of concurrent photosynthate to the stem, petiole, and podwall parts but it is not sufficient to change the uptake of photosynthate into the seeds of Y‐shaped plants with an uneven distribution of sources and sinks.
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Claims 10
Claim · model-written summary
Pod and seed abortion increased on the deleafed branch of the uneven treatment.
- Taxon
- soybeans
Glycine maxe0 - Organ / stage
- deleafed branche1
- Treatment
- uneven treatmente1
- Outcome
- abortion of pods and seedse1
- Direction
- Increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e1“Increased abortion of pods and seeds on the deleafed branch and decreased abortion on the depodded branch of the uneven treatment”
Claim · model-written summary
Pod and seed abortion decreased on the depodded branch of the uneven treatment.
- Taxon
- soybeansGlycine maxe0
- Organ / stage
- depodded branche1
- Treatment
- uneven treatmente1
- Outcome
- abortion of pods and seedse1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e1“Increased abortion of pods and seeds on the deleafed branch and decreased abortion on the depodded branch of the uneven treatment”
Claim · model-written summary
The uneven treatment equalized the reproductive load on all pruned branches.
- Taxon
- soybeansGlycine maxe0
- Treatment
- uneven treatmente1
- Outcome
- reproductive load on all the pruned branchese2
- Direction
- equalizede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e1“Increased abortion of pods and seeds on the deleafed branch and decreased abortion on the depodded branch of the uneven treatment”
e2“equalized the reproductive load on all the pruned branches”
Claim · model-written summary
Pruning had no effect on photosynthesis per unit leaf area.
- Taxon
- soybeansGlycine maxe0
- Treatment
- pruninge3
- Outcome
- photosynthesis per unit leaf areae3
- Direction
- no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e3“The pruning had no effect on photosynthesis per unit leaf area”
Claim · model-written summary
Pruning had no effect on the rate of radioactivity disappearance from leaves in the first hours after labelling.
- Taxon
- soybeansGlycine maxe0
- Treatment
- pruninge3
- Outcome
- rate of disappearance of radioactivity from leavese5
- Direction
- no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e3“The pruning had no effect on photosynthesis per unit leaf area”
e5“or on the rate of disappearance of radioactivity from leaves in the first few hours after labelling”
Claim · model-written summary
Pruning left the movement of radioactivity out of the leaf or into the seed unaffected.
- Taxon
- soybeansGlycine maxe0
- Treatment
- pruninge3
- Outcome
- movement of the radioactivity out of the leaf or into the seede4
- Direction
- unaffectede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e3“The pruning had no effect on photosynthesis per unit leaf area”
e4“Moreover, the movement of the radioactivity out of the leaf or into the seed was unaffected”
Claim · model-written summary
The uneven treatment changed photosynthate retained in the stem; the depodded stem retained twice the radioactivity of the deleafed stem after 24 h.
- Taxon
- soybeansGlycine maxe0
- Organ / stage
- depodded steme6
- Treatment
- uneven treatmente6
- Outcome
- amount of photosynthate retained in the steme6
- Direction
- retained twicee6
- Value
- twicee6
- Comparator
- deleafed steme6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e6“The uneven treatment did induce a change in the amount of photosynthate retained in the stem of the two different branches; the depodded stem retained twice the radioactivity of the deleafed stem after 24 h”
Claim · model-written summary
The difference in stem radioactivity between treatments persisted to the end of the season at about a factor of 2 lower level.
- Taxon
- soybeansGlycine maxe0
- Outcome
- difference in radioactivity in the stemse7
- Value
- factor of 2e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e7“The difference in radioactivity in the stems of different treatments noted 24 h after labelling was also found at the end of the season, though the level of radioactivity was reduced by a factor of 2”
Claim · model-written summary
Resistance to translocation is not sufficient to change uptake of photosynthate into the seeds.
- Taxon
- soybeansGlycine maxe0
- Outcome
- uptake of photosynthate into the seedse7
- Qualifier
- resistance to translocatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e7“The resistance to translocation is sufficient to alter the distribution of concurrent photosynthate to the stem, petiole, and podwall parts but it is not sufficient to change the uptake of photosynthate into the seeds”
Claim · model-written summary
Resistance to translocation is sufficient to alter the distribution of photosynthate to the stem, petiole and podwall.
- Taxon
- soybeansGlycine maxe0
- Outcome
- distribution of concurrent photosynthate to the steme7
- Qualifier
- resistance to translocatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of soybeans ( Glycine max L. Merrill)”
e7“The resistance to translocation is sufficient to alter the distribution of concurrent photosynthate to the stem, petiole, and podwall parts but it is not sufficient to change the uptake of photosynthate into the seeds”
The same questions in other papers
pruning · physiology: photosynthesis · Glycine max (soybean)Results differ
3 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.