Abstract
Abstract We studied the factors controlling nitrogen (N) release from roots and nodules of soybean (Glycine max L. Merr. cv. Kurosengoku). Plants were subjected to pod removal, stem-girdling and defoliation at the pod-filling stage and the effects on nitrogen fixation and release of nitrogenous compounds from the roots were monitored under water culture conditions. Nitrogen fixation was significantly reduced in all the treated plants. In spite of the reduction in the concentration of sugar in the roots and nodules of defoliated and stem-girdled plants, only the latter treatment promoted sustained exudation of total N and ureides. Pod removal did not affect the root and nodule sugar concentration, nor promote the release of nitrogenous compounds. Based on these results, it is suggested that low nitrogen fixation activity as well as low sugar concentration in root and nodules may not be the only factors responsible for N exudation.
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Claims 9
Claim · model-written summary
Pod removal significantly reduced nitrogen fixation.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- pod-filling stagee0
- Treatment
- pod removale0
- Outcome
- Nitrogen fixatione1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants were subjected to pod removal, stem-girdling and defoliation at the pod-filling stage”
e1“Nitrogen fixation was significantly reduced in all the treated plants”
t0“soybean”
Claim · model-written summary
Stem girdling significantly reduced nitrogen fixation.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- pod-filling stagee0
- Treatment
- stem-girdlinge0
- Outcome
- Nitrogen fixatione1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants were subjected to pod removal, stem-girdling and defoliation at the pod-filling stage”
e1“Nitrogen fixation was significantly reduced in all the treated plants”
t0“soybean”
Claim · model-written summary
Defoliation significantly reduced nitrogen fixation.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- pod-filling stagee0
- Treatment
- defoliatione0
- Outcome
- Nitrogen fixatione1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants were subjected to pod removal, stem-girdling and defoliation at the pod-filling stage”
e1“Nitrogen fixation was significantly reduced in all the treated plants”
t0“soybean”
Claim · model-written summary
Defoliation reduced sugar concentration in soybean roots and nodules.
- Taxon
- soybeanGlycine maxt0
- Treatment
- defoliatede0
- Outcome
- concentration of sugar in the roots and nodulese0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction in the concentration of sugar in the roots and nodules of defoliated and stem-girdled plants”
t0“soybean”
Claim · model-written summary
Stem girdling reduced sugar concentration in soybean roots and nodules.
- Taxon
- soybeanGlycine maxt0
- Treatment
- stem-girdlede0
- Outcome
- concentration of sugar in the roots and nodulese0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction in the concentration of sugar in the roots and nodules of defoliated and stem-girdled plants”
t0“soybean”
Claim · model-written summary
Stem girdling promoted sustained total nitrogen and ureide exudation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- stem-girdlede1
- Outcome
- exudation of total N and ureidese0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only the latter treatment promoted sustained exudation of total N and ureides”
e1“defoliated and stem-girdled plants”
t0“soybean”
Claim · model-written summary
Pod removal did not affect root and nodule sugar concentration.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Pod removale0
- Outcome
- root and nodule sugar concentratione0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pod removal did not affect the root and nodule sugar concentration”
t0“soybean”
Claim · model-written summary
Pod removal did not promote release of nitrogenous compounds.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Pod removale0
- Outcome
- release of nitrogenous compoundse0
- Direction
- nor promotee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pod removal did not affect the root and nodule sugar concentration, nor promote the release of nitrogenous compounds”
t0“soybean”
Claim · model-written summary
Low nitrogen fixation and low root and nodule sugar may not alone explain nitrogen exudation.
- Taxon
- soybeanGlycine maxt0
- Outcome
- N exudatione0
- Qualifier
- low nitrogen fixation activity as well as low sugar concentration in root and nodulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low nitrogen fixation activity as well as low sugar concentration in root and nodules may not be the only factors responsible for N exudation”
t0“soybean”
The same questions in other papers
pruning · symbiosis · Glycine max (soybean)Positive and negative results
5 papers in the same direction as this paper · 3 in the opposite direction
- positive
- negative
- negative
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.