Abstract
Abstract Effects of pod removal and defoliation on the growth, dinitrogen-fixing activity, ureide concentration in xylem exudate and nodules, and translocation of photosynthates in soybean (Glycine max (L.) Merr. cv. Tamahomare) were examined and the following results were obtained. 1. Dinitrogen-fixing activity decreased significantly by both pod removal and defoliation.2. The concentration of sugars and starch in the nodules increased by pod removal but decreased by complete defoliation, while it did not change by partial defoliation.3. The ureide concentration in the xylem exudate and nodules increased by pod removal, especially by complete defoliation.4. Pod removal led to a decrease in the export rate of 14C from leaf but had no effect on 14C distribution percentage in the nodules.5. Exudation rate of ureide-14C in the xylem sap was lower during the first hour after the exposure to 14CO2 and thereafter it was higher in depodded than in control plants. From these results, it is suggested that the factor controlling of the dinitrogen-fixing activity of soybean under ordinary field conditions is presumably not the status of the photo-synthate supply to the nodules but, the export rate of the fixed-N from nodules.
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Claims 11
Claim · model-written summary
Pod removal significantly decreased soybean dinitrogen-fixing activity.
- Taxon
- Glycine max
Glycine maxe1 - Material
- Tamahomaree1
- Treatment
- pod removale0
- Outcome
- Dinitrogen-fixing activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dinitrogen-fixing activity decreased significantly by both pod removal and defoliation.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Defoliation significantly decreased soybean dinitrogen-fixing activity.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- defoliatione0
- Outcome
- Dinitrogen-fixing activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dinitrogen-fixing activity decreased significantly by both pod removal and defoliation.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Pod removal increased sugars and starch concentrations in soybean nodules.
- Taxon
- Glycine maxGlycine maxe1
- Organ / stage
- nodulese0
- Treatment
- pod removale0
- Outcome
- concentration of sugars and starch in the nodulese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentration of sugars and starch in the nodules increased by pod removal but decreased by complete defoliation, while it did not change by partial defoliation.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Complete defoliation decreased sugars and starch concentrations in soybean nodules.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- complete defoliatione0
- Outcome
- concentration of sugars and starch in the nodulese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentration of sugars and starch in the nodules increased by pod removal but decreased by complete defoliation, while it did not change by partial defoliation.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Partial defoliation did not change sugars and starch concentrations in soybean nodules.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- partial defoliatione0
- Outcome
- concentration of sugars and starch in the nodulese0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentration of sugars and starch in the nodules increased by pod removal but decreased by complete defoliation, while it did not change by partial defoliation.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Pod removal increased ureide concentration in soybean xylem exudate and nodules.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- pod removale0
- Outcome
- ureide concentration in the xylem exudate and nodulese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ureide concentration in the xylem exudate and nodules increased by pod removal, especially by complete defoliation.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Complete defoliation especially increased ureide concentration in soybean xylem exudate and nodules.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- complete defoliatione0
- Outcome
- ureide concentration in the xylem exudate and nodulese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ureide concentration in the xylem exudate and nodules increased by pod removal, especially by complete defoliation.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Pod removal decreased the export rate of 14C from soybean leaves.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- Pod removale0
- Outcome
- export rate of 14C from leafe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pod removal led to a decrease in the export rate of 14C from leaf but had no effect on 14C distribution percentage in the nodules.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Pod removal had no effect on the percentage distribution of 14C in soybean nodules.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- Pod removale0
- Outcome
- 14C distribution percentage in the nodulese0
- Direction
- had no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pod removal led to a decrease in the export rate of 14C from leaf but had no effect on 14C distribution percentage in the nodules.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
Depodded soybean plants had a lower xylem sap ureide-14C exudation rate in the first hour, then a higher rate than controls.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- depoddede0
- Outcome
- Exudation rate of ureide-14C in the xylem sape0
- Direction
- lower during the first hour after the exposure to 14CO2 and thereafter it was highere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exudation rate of ureide-14C in the xylem sap was lower during the first hour after the exposure to 14CO2 and thereafter it was higher in depodded than in control plants.”
e1“soybean (Glycine max (L.) Merr. cv. Tamahomare)”
Claim · model-written summary
The authors suggest soybean dinitrogen fixation under ordinary field conditions is controlled by fixed nitrogen export from nodules rather than photosynthate supply.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- nodulese0
- Outcome
- dinitrogen-fixing activitye0
- Qualifier
- presumablye0
- Setting
- ordinary field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the factor controlling of the dinitrogen-fixing activity of soybean under ordinary field conditions is presumably not the status of the photo-synthate supply to the nodules but, the export rate of the fixed-N from nodules.”
The same questions in other papers
pruning · symbiosis · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 6 in the opposite direction
- negative
- negative
- no effect
5 papers more in this group
See all 9 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.