Abstract
Neves, M. C. P, Didonet, A. D., Duque, F. F. and Dobereiner, J. 1985. Rhizobium strain effects on nitrogen transport and distribution in soybeans.—J. exp. Bot. 36: 1179–1192. The role of six Rhizobium strains in the nitrogen metabolism of soybeans (Glycine max Merril) was studied under glasshouse and field conditions. The strains could be divided into two groups, group I which produced a large nodule mass with relatively low efficiency and group II which produced less nodule mass but which fixed the same amount of nitrogen. Plants inoculated with group I strains remobilized nitrogen faster from leaves but also lost more nitrogen in senesced leaves. Although the total nitrogen transported in the xylem was similar for all strains, plants inoculated with group I strains contained less nitrogen in ureides in the xylem sap during the whole growth cycle. This difference was reflected in the nitrogen partitioning within the shoot, and smaller nitrogen harvest indexes were observed in these plants than in those inoculated with strains of group II. The role of ureides in the nitrogen partitioning and grain yield was confirmed by the significant correlation between mean ureide content in xylem sap and nitrogen partitioning or yield. Further, nodules formed with group I strains evolved more hydrogen than those formed with group II strains and the possible significance of this is discussed.
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Claims 10
Claim · model-written summary
Group I strains produced more nodule mass with lower efficiency.
- Taxon
- soybeans
Glycine maxt0 - Interactor
- group Ie0symbiont
- Outcome
- nodule masse0
- Direction
- largee0
- Comparator
- group IIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“group I which produced a large nodule mass with relatively low efficiency and group II which produced less nodule mass but which fixed the same amount of nitrogen.”
t0“soybeans”
Claim · model-written summary
Group II strains produced less nodule mass while fixing the same nitrogen amount.
- Taxon
- soybeansGlycine maxt0
- Interactor
- group IIe0symbiont
- Outcome
- nodule masse0
- Direction
- lesse0
- Qualifier
- fixed the same amount of nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“group II which produced less nodule mass but which fixed the same amount of nitrogen.”
t0“soybeans”
Claim · model-written summary
Group I-inoculated plants remobilized leaf nitrogen faster.
- Taxon
- soybeansGlycine maxt0
- Treatment
- inoculated with group I strainse0
- Interactor
- group I strainse0symbiont
- Outcome
- nitrogen faster from leavese0
- Direction
- fastere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants inoculated with group I strains remobilized nitrogen faster from leaves but also lost more nitrogen in senesced leaves.”
t0“soybeans”
Claim · model-written summary
Group I-inoculated plants lost more nitrogen in senesced leaves.
- Taxon
- soybeansGlycine maxt0
- Treatment
- inoculated with group I strainse0
- Interactor
- group I strainse0symbiont
- Outcome
- nitrogen in senesced leavese0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants inoculated with group I strains remobilized nitrogen faster from leaves but also lost more nitrogen in senesced leaves.”
t0“soybeans”
Claim · model-written summary
Total xylem nitrogen transport was similar among strains.
- Taxon
- soybeansGlycine maxt0
- Interactor
- strainse0symbiont
- Outcome
- total nitrogen transported in the xyleme0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the total nitrogen transported in the xylem was similar for all strains”
t0“soybeans”
Claim · model-written summary
Group I plants had less ureide nitrogen in xylem sap.
- Taxon
- soybeansGlycine maxt0
- Treatment
- inoculated with group I strainse0
- Interactor
- group I strainse0symbiont
- Outcome
- nitrogen in ureides in the xylem sape0
- Direction
- lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants inoculated with group I strains contained less nitrogen in ureides in the xylem sap during the whole growth cycle.”
t0“soybeans”
Claim · model-written summary
Group I plants had lower nitrogen harvest indexes than group II plants.
- Taxon
- soybeansGlycine maxt0
- Treatment
- these plantse0
- Outcome
- nitrogen harvest indexese0
- Direction
- smallere0
- Comparator
- strains of group IIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“smaller nitrogen harvest indexes were observed in these plants than in those inoculated with strains of group II.”
t0“soybeans”
Claim · model-written summary
Ureide content correlated significantly with nitrogen partitioning.
- Taxon
- soybeansGlycine maxt0
- Compound
- ureidee0
- Outcome
- nitrogen partitioninge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant correlation between mean ureide content in xylem sap and nitrogen partitioning or yield.”
t0“soybeans”
Claim · model-written summary
Ureide content correlated significantly with yield.
- Taxon
- soybeansGlycine maxt0
- Compound
- ureidee0
- Outcome
- yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant correlation between mean ureide content in xylem sap and nitrogen partitioning or yield.”
t0“soybeans”
Claim · model-written summary
Group I nodules evolved more hydrogen than group II nodules.
- Taxon
- soybeansGlycine maxt0
- Interactor
- group I strainse0symbiont
- Outcome
- hydrogene0
- Direction
- moree0
- Comparator
- group II strainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nodules formed with group I strains evolved more hydrogen than those formed with group II strains”
t0“soybeans”