Abstract
A clone of Spartium junceum (Spanish broom) was used to evaluate the consequence of different soil nitrogen regimes on growth and assimilation of leaves and stems. Nitrogen limitation caused a general reduction in aboveground growth, and NO3- limitation resulted in a greater reduction in leaf area compared to stem area. Supplemental soil nitrogen, from NH4+, caused increased growth and a greater increase in stem area compared to leaf area. Excess NH4+ caused decreased growth of leaves and stems. Under nitrogen-limiting conditions, a greater amount of nitrogen was in stems than in leaves, particularly on a surface area basis. Both stem and leaf assimilation were reduced under limiting nitrogen, but the net effect was an increase in the stem contribution to daily carbon gain compared to a decrease for leaves. Stem and leaf assimilation had similar linear relationships with tissue nitrogen concentration. Nitrogen use efficiency increased under nitrogen limitation. Thus, as the proportion of whole plant nitrogen in the stems increased compared to that in leaves at low nitrogen availability, the nitrogen use efficiency increased.
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Claims 12
Claim · model-written summary
Nitrogen limitation reduced aboveground growth.
- Taxon
- Spartium junceum
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Spartium junceumt0 - Treatment
- Nitrogen limitatione0
- Outcome
- aboveground growthe0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Nitrogen limitation caused a general reduction in aboveground growth”
t0“Spartium junceum”
Claim · model-written summary
Nitrate limitation reduced leaf area more than stem area.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- NO3- limitatione0
- Outcome
- leaf areae0
- Direction
- greater reductione0
- Comparator
- stem areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NO3- limitation resulted in a greater reduction in leaf area compared to stem area”
t0“Spartium junceum”
Claim · model-written summary
Supplemental ammonium increased growth.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- Supplemental soil nitrogen, from NH4+e0
- Outcome
- growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supplemental soil nitrogen, from NH4+, caused increased growth”
t0“Spartium junceum”
Claim · model-written summary
Supplemental ammonium increased stem area more than leaf area.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- Supplemental soil nitrogen, from NH4+e1
- Outcome
- stem areae0
- Direction
- greater increasee0
- Comparator
- leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a greater increase in stem area compared to leaf area”
t0“Spartium junceum”
e1“Supplemental soil nitrogen, from NH4+, caused increased growth and a greater increase in stem area compared to leaf area.”
Claim · model-written summary
Excess ammonium decreased leaf and stem growth.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- Excess NH4+e0
- Outcome
- growth of leaves and stemse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excess NH4+ caused decreased growth of leaves and stems.”
t0“Spartium junceum”
Claim · model-written summary
Under nitrogen limitation stems contained more nitrogen than leaves.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- nitrogen-limiting conditionse0
- Outcome
- amount of nitrogen was in stemse0
- Direction
- greatere0
- Qualifier
- particularly on a surface area basise0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under nitrogen-limiting conditions, a greater amount of nitrogen was in stems than in leaves, particularly on a surface area basis.”
t0“Spartium junceum”
Claim · model-written summary
Nitrogen limitation reduced stem assimilation.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- limiting nitrogene0
- Outcome
- stem and leaf assimilatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both stem and leaf assimilation were reduced under limiting nitrogen”
t0“Spartium junceum”
Claim · model-written summary
Nitrogen limitation reduced leaf assimilation.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- limiting nitrogene0
- Outcome
- leaf assimilatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both stem and leaf assimilation were reduced under limiting nitrogen”
t0“Spartium junceum”
Claim · model-written summary
Stem contribution to daily carbon gain increased while that of leaves decreased.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- limiting nitrogene1
- Outcome
- stem contribution to daily carbon gaine0
- Direction
- increasee0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the net effect was an increase in the stem contribution to daily carbon gain compared to a decrease for leaves”
t0“Spartium junceum”
e1“Both stem and leaf assimilation were reduced under limiting nitrogen, but the net effect was an increase in the stem contribution to daily carbon gain compared to a decrease for leaves.”
Claim · model-written summary
Leaf contribution to daily carbon gain decreased under nitrogen limitation.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- limiting nitrogene1
- Outcome
- leavese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to a decrease for leaves”
t0“Spartium junceum”
e1“Both stem and leaf assimilation were reduced under limiting nitrogen, but the net effect was an increase in the stem contribution to daily carbon gain compared to a decrease for leaves.”
Claim · model-written summary
Stem and leaf assimilation had similar linear relationships with tissue nitrogen concentration.
- Taxon
- Spartium junceumSpartium junceumt0
- Compound
- tissue nitrogen concentratione0
- Outcome
- Stem and leaf assimilatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem and leaf assimilation had similar linear relationships with tissue nitrogen concentration.”
t0“Spartium junceum”
Claim · model-written summary
Nitrogen use efficiency increased under nitrogen limitation.
- Taxon
- Spartium junceumSpartium junceumt0
- Treatment
- nitrogen limitatione0
- Outcome
- Nitrogen use efficiencye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen use efficiency increased under nitrogen limitation.”
t0“Spartium junceum”
The same questions in other papers
nitrogen · nutrient: efficiency · Spartium junceumResults agree
1 paper in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
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.