Abstract
The patterns of nitrate reductase activity (NRA) in the leaves (in vivo assay) and root nodule nitrogenase activity (C(2)H(2) reduction) were investigated throughout the season in field-grown Phaseolus vulgaris plants.Maximal NRA (per g fresh weight) occurred at early stages of leaf development but total activity (per leaf) was maximal when the leaf reached full size. In mature plants, most NRA was associated with the upper leaves. Nitrogenase activity was initiated about 2 weeks after sowing, reached a maximum at flowering (5 weeks after sowing) and declined rapidly thereafter. Nitrogenase activity followed the pattern of nodule development. After flowering, P. vulgaris was apparently able to take up and assimilate NO(-) (3) as evidenced by the increase in NO(-) (3) content of the stem and the high levels of NRA in the leaves. Total plant NRA was maximal after flowering and addition of NH(4)NO(3) to the soil at flowering resulted in even higher levels of NRA through most of the pod-filling period, thus resulting in higher seed yields (59% over control).It is proposed that P. vulgaris can benefit from both N(2) fixation and NO(-) (3) assimilation and that nitrate reductase plays an important role in the assimilation of nitrogen after flowering.
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Claims 13
Claim · model-written summary
Leaf nitrate reductase activity per fresh weight peaked early in leaf development.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarist0 - Organ / stage
- early stages of leaf developmente0
- Outcome
- NRA (per g fresh weight)e0
- Direction
- Maximale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“Maximal NRA (per g fresh weight) occurred at early stages of leaf development”
Claim · model-written summary
Total nitrate reductase activity per leaf peaked at full leaf size.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- full sizee0
- Outcome
- total activity (per leaf)e0
- Direction
- maximale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“total activity (per leaf) was maximal when the leaf reached full size”
Claim · model-written summary
Most nitrate reductase activity in mature plants was in upper leaves.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- upper leavese0
- Outcome
- NRAe0
- Qualifier
- mature plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“In mature plants, most NRA was associated with the upper leaves”
Claim · model-written summary
Nitrogenase activity began about two weeks after sowing.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- Nitrogenase activity was initiatede0
- Value
- 2 weeks after sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“Nitrogenase activity was initiated about 2 weeks after sowing”
Claim · model-written summary
Nitrogenase activity peaked at flowering five weeks after sowing.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- floweringe0
- Outcome
- maximume0
- Direction
- maximume0
- Value
- 5 weeks after sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“reached a maximum at flowering (5 weeks after sowing)”
Claim · model-written summary
Nitrogenase activity declined rapidly after flowering.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- Nitrogenase activitye0
- Direction
- declined rapidlye0
- Qualifier
- thereaftere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“Nitrogenase activity was initiated about 2 weeks after sowing, reached a maximum at flowering (5 weeks after sowing) and declined rapidly thereafter”
Claim · model-written summary
Nitrogenase activity tracked nodule development.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- nodule developmente0
- Outcome
- Nitrogenase activitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“Nitrogenase activity followed the pattern of nodule development”
Claim · model-written summary
After flowering, stem nitrate content increased.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- steme0
- Outcome
- NO(-) (3) content of the steme0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“After flowering, P. vulgaris was apparently able to take up and assimilate NO(-) (3) as evidenced by the increase in NO(-) (3) content of the stem”
Claim · model-written summary
Leaves maintained high nitrate reductase activity after flowering.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- NRA in the leavese0
- Direction
- high levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“the high levels of NRA in the leaves”
Claim · model-written summary
Total plant nitrate reductase activity peaked after flowering.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- floweringe0
- Outcome
- Total plant NRAe0
- Direction
- maximale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“Total plant NRA was maximal after flowering”
Claim · model-written summary
Ammonium nitrate added at flowering raised nitrate reductase activity through most pod filling.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- addition of NH(4)NO(3) to the soil at floweringe0
- Outcome
- NRAe0
- Direction
- highere0
- Qualifier
- through most of the pod-filling periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“addition of NH(4)NO(3) to the soil at flowering resulted in even higher levels of NRA through most of the pod-filling period”
Claim · model-written summary
Ammonium nitrate at flowering increased seed yield by 59% over control.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- addition of NH(4)NO(3) to the soil at floweringe0
- Outcome
- seed yieldse0
- Direction
- highere0
- Value
- 59%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“addition of NH(4)NO(3) to the soil at flowering resulted in even higher levels of NRA through most of the pod-filling period, thus resulting in higher seed yields (59% over control)”
Claim · model-written summary
The authors propose that the plant benefits from nitrogen fixation and nitrate assimilation, with nitrate reductase important after flowering.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- assimilation of nitrogen after floweringe0
- Qualifier
- nitrate reductase plays an important rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phaseolus vulgaris L.”
e0“P. vulgaris can benefit from both N(2) fixation and NO(-) (3) assimilation and that nitrate reductase plays an important role in the assimilation of nitrogen after flowering”
The same questions in other papers
stage · yield · Phaseolus vulgaris (common bean)Positive and negative results
13 papers in the same direction as this paper · 15 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
26 papers more in this group
See all 30 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.