Abstract
Decreased N2 fixation in soybean (Glycine max) L. Merr. during water deficits has been associated with increases in ureides and free amino acids in plant tissues, indicating a potential feedback inhibition by these compounds in response to drought. We evaluated concentrations of ureides and amino acids in leaf and nodule tissue and the concurrent change in N2 fixation in response to exogenous ureides and soil-water treatments for the cultivars Jackson and KS4895. Exogenous ureides applied to the soil and water-deficit treatments inhibited N2 fixation by 85% to 90%. Mn fertilization increased the apparent catabolism of ureides in leaves and hastened the recovery of N2 fixation following exogenous ureide application for both cultivars. Ureides and total free amino acids in leaves and nodules increased during water deficits and coincided with a decline in N2 fixation for both cultivars. N2 fixation recovered to 74% to 90% of control levels 2 d after rewatering drought-stressed plants, but leaf ureides and total nodule amino acids remained elevated in KS4895. Asparagine accounted for 82% of the increase in nodule amino acids relative to well-watered plants at 2 d after rewatering. These results indicate that leaf ureides and nodule asparagine do not feedback inhibit N2 fixation. Compounds whose increase and decrease in concentration mirrored the decline and recovery of N2 fixation included nodule ureides, nodule aspartate, and several amino acids in leaves, indicating that these are potential candidate molecules for feedback inhibition of N2 fixation.
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Claims 9
Claim · model-written summary
Exogenous ureides applied to the soil inhibited N2 fixation by 85% to 90%.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Exogenous ureides applied to the soile1
- Outcome
- N2 fixatione1
- Direction
- inhibitede1
- Value
- 85% to 90%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e1“Exogenous ureides applied to the soil and water-deficit treatments inhibited N2 fixation by 85% to 90%”
Claim · model-written summary
Water-deficit treatments inhibited N2 fixation by 85% to 90%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- water-deficit treatmentse1
- Outcome
- N2 fixatione1
- Direction
- inhibitede1
- Value
- 85% to 90%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e1“Exogenous ureides applied to the soil and water-deficit treatments inhibited N2 fixation by 85% to 90%”
Claim · model-written summary
Mn fertilization increased the apparent catabolism of ureides in leaves in both cultivars.
- Taxon
- soybeanGlycine maxt0
- Material
- Jackson and KS4895e3
- Treatment
- Mn fertilizatione2
- Outcome
- apparent catabolism of ureides in leavese2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e2“Mn fertilization increased the apparent catabolism of ureides in leaves and hastened the recovery of N2 fixation following exogenous ureide application for both cultivars”
e3“for the cultivars Jackson and KS4895”
Claim · model-written summary
Mn fertilization hastened the recovery of N2 fixation after exogenous ureide application.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Mn fertilizatione2
- Outcome
- recovery of N2 fixatione2
- Direction
- hastenede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e2“Mn fertilization increased the apparent catabolism of ureides in leaves and hastened the recovery of N2 fixation following exogenous ureide application for both cultivars”
Claim · model-written summary
Ureides and total free amino acids in leaves and nodules increased during water deficits, coinciding with a decline in N2 fixation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- water deficitse4
- Outcome
- Ureides and total free amino acids in leaves and nodulese4
- Direction
- increasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e4“Ureides and total free amino acids in leaves and nodules increased during water deficits and coincided with a decline in N2 fixation for both cultivars”
Claim · model-written summary
N2 fixation recovered to 74% to 90% of control levels 2 d after rewatering.
- Taxon
- soybeanGlycine maxt0
- Treatment
- rewateringe5
- Outcome
- N2 fixatione5
- Direction
- recoverede5
- Value
- 74% to 90%e5
- Comparator
- control levelse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e5“N2 fixation recovered to 74% to 90% of control levels 2 d after rewatering drought-stressed plants”
Claim · model-written summary
Asparagine accounted for 82% of the increase in nodule amino acids relative to well-watered plants 2 d after rewatering.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- nodulee6
- Outcome
- Asparagine accounted for 82% of the increase in nodule amino acidse6
- Value
- 82%e6
- Qualifier
- relative to well-watered plantse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e6“Asparagine accounted for 82% of the increase in nodule amino acids relative to well-watered plants at 2 d after rewatering”
Claim · model-written summary
Leaf ureides and nodule asparagine do not feedback-inhibit N2 fixation.
- Taxon
- soybeanGlycine maxt0
- Compound
- leaf ureides and nodule asparaginee7
- Outcome
- N2 fixatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e7“These results indicate that leaf ureides and nodule asparagine do not feedback inhibit N2 fixation”
Claim · model-written summary
Nodule ureides, nodule aspartate and several leaf amino acids are candidate molecules for feedback inhibition of N2 fixation.
- Taxon
- soybeanGlycine maxt0
- Compound
- nodule ureides, nodule aspartatee7
- Outcome
- N2 fixatione7
- Qualifier
- potential candidate molecules for feedback inhibitione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2 Fixation in Soybean”
e7“Compounds whose increase and decrease in concentration mirrored the decline and recovery of N2 fixation included nodule ureides, nodule aspartate, and several amino acids in leaves, indicating that these are potential candidate molecules for feedback inhibition of N2 fixation”
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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.