Abstract
A pot experiment was carried out with soybean plants using vermiculite as a growth medium to study the effect of salt stress on: a) the uptake and distribution of biologically fixed nitrogen and applied fertilizer nitrogen using I~N as a tracer and b) the contents of protein, free amino acids, sugars, and starch in pods as criteria of yield quality.The results obtained are summarized as follows: 1) Salt-affected plants derived lower amounts of atmospheric nitrogen (NDFA), and also absorbed lower amounts of fertilizer nitrogen (NDFF) per plant as compared to control plants.2) The percentage of nitrogen derived from fertilizer (NDFF %) in the salt-affected plants was higher than in the control plants, suggesting that the salt-affected plants are less dependent on fixed nitrogen due to their lower nodulation ability.3) Nodules as compared to other plant organs were much less dependent on fertilizer nitrogen.This was more evident in the control plants compared to the salt-affected ones.4) Regardless of the effect of salinity, plant roots accumulated a higher percentage of NDFF than NDFA, and the accumulation of NDFF decreased as the plant developed to maturity.5) Pod accumulation of both NDFF and NDFA which gradually increased as the plant developed to maturity, was lower in the salt-affected plants particularly at the filling stage.6) The contents of protein, total free amino acids, sucrose, and starch, as criteria of yield quality, were all decreased in the pods of the salt-affected plants.However, the concentrations of protein and sucrose were not as severely affected compared with the other criteria tested.The depressive effect of salinity on the pod protein content seemed to be due to the decrease in the efficiency of pod protein production percent rather than to the decrease in the incorporation of amino acids into protein.
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Claims 13
Claim · model-written summary
Salt-affected soybean plants derived less atmospheric nitrogen per plant than controls.
- Taxon
- soybeans
Glycine maxt0 - Treatment
- Salt-affectede0
- Outcome
- atmospheric nitrogen (NDFA)e0
- Direction
- lowere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt-affected plants derived lower amounts of atmospheric nitrogen (NDFA), and also absorbed lower amounts of fertilizer nitrogen (NDFF) per plant as compared to control plants.”
t0“soybeans”
Claim · model-written summary
Salt-affected soybean plants absorbed less fertilizer nitrogen per plant than controls.
- Taxon
- soybeansGlycine maxt0
- Treatment
- Salt-affectede0
- Outcome
- fertilizer nitrogen (NDFF) per plante0
- Direction
- lowere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt-affected plants derived lower amounts of atmospheric nitrogen (NDFA), and also absorbed lower amounts of fertilizer nitrogen (NDFF) per plant as compared to control plants.”
t0“soybeans”
Claim · model-written summary
Salt-affected soybean had a higher percentage of nitrogen derived from fertilizer than controls.
- Taxon
- soybeansGlycine maxt0
- Treatment
- salt-affectede0
- Outcome
- percentage of nitrogen derived from fertilizer (NDFF %)e0
- Direction
- highere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of nitrogen derived from fertilizer (NDFF %) in the salt-affected plants was higher than in the control plants”
t0“soybeans”
Claim · model-written summary
Nodules depended much less on fertilizer nitrogen than other soybean organs.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- Nodulese0
- Outcome
- dependent on fertilizer nitrogene0
- Direction
- much lesse0
- Comparator
- other plant organse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodules as compared to other plant organs were much less dependent on fertilizer nitrogen.”
t0“soybeans”
Claim · model-written summary
The lower fertilizer nitrogen dependence of nodules was more evident in control plants.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- Nodulese1
- Outcome
- dependent on fertilizer nitrogene1
- Direction
- more evidente0
- Comparator
- salt-affected onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was more evident in the control plants compared to the salt-affected ones.”
e1“Nodules as compared to other plant organs were much less dependent on fertilizer nitrogen.”
t0“soybeans”
Claim · model-written summary
Soybean roots accumulated a higher percentage of fertilizer-derived than atmospherically fixed nitrogen regardless of salinity.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- plant rootse0
- Outcome
- percentage of NDFFe0
- Direction
- highere0
- Comparator
- NDFAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of the effect of salinity, plant roots accumulated a higher percentage of NDFF than NDFA”
t0“soybeans”
Claim · model-written summary
Fertilizer-derived nitrogen accumulation decreased as soybean plants matured.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- maturitye0
- Outcome
- accumulation of NDFFe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of NDFF decreased as the plant developed to maturity”
t0“soybeans”
Claim · model-written summary
Soybean pod accumulation of fertilizer-derived nitrogen increased toward maturity.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- Pode0
- Outcome
- accumulation of both NDFF and NDFAe0
- Direction
- gradually increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pod accumulation of both NDFF and NDFA which gradually increased as the plant developed to maturity”
t0“soybeans”
Claim · model-written summary
Soybean pod accumulation of both nitrogen sources was lower under salt stress, particularly at filling.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- filling stagee0
- Treatment
- salt-affectede0
- Outcome
- Pod accumulation of both NDFF and NDFAe0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pod accumulation of both NDFF and NDFA which gradually increased as the plant developed to maturity, was lower in the salt-affected plants particularly at the filling stage.”
t0“soybeans”
Claim · model-written summary
Salt stress decreased protein and free amino acid content in soybean pods.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- podse0
- Treatment
- salt-affectede0
- Outcome
- contents of protein, total free amino acidse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of protein, total free amino acids, sucrose, and starch, as criteria of yield quality, were all decreased in the pods of the salt-affected plants.”
t0“soybeans”
Claim · model-written summary
Salt stress decreased sucrose and starch content in soybean pods.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- podse0
- Treatment
- salt-affectede0
- Outcome
- sucrose, and starche0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of protein, total free amino acids, sucrose, and starch, as criteria of yield quality, were all decreased in the pods of the salt-affected plants.”
t0“soybeans”
Claim · model-written summary
Pod protein and sucrose concentrations were less severely affected than other quality measures.
- Taxon
- soybeansGlycine maxt0
- Outcome
- concentrations of protein and sucrosee0
- Direction
- not as severely affectede0
- Comparator
- other criteria testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations of protein and sucrose were not as severely affected compared with the other criteria tested”
t0“soybeans”
Claim · model-written summary
The authors attributed lower pod protein under salinity to reduced protein production efficiency.
- Taxon
- soybeansGlycine maxt0
- Treatment
- salinitye0
- Outcome
- pod protein contente0
- Qualifier
- decrease in the efficiency of pod protein production percente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The depressive effect of salinity on the pod protein content seemed to be due to the decrease in the efficiency of pod protein production percent rather than to the decrease in the incorporation of amino acids into protein.”
t0“soybeans”
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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.