Abstract
When grown in an environment known not to favour the production of large seed yields (warm days-cool nights; 33–19 °C), non-nodulated plants of cowpea cv. K 2809 supplied with abundant inorganic nitrogen not only assimilated N more rapidly but also produced larger total dry weights and seed yields than plants dependent on Rhizobium CB 756. Remobilization of nitrogen from vegetative organs started sooner in nitrate-dependent than in nodulated plants and contributed 69 and 47%, respectively, to the N content of mature fruits. Plants dependent on nodules relied more on current assimilation of nitrogen during the later stages of fruit growth than those given inorganic N; they also utilized a larger proportion of shoot-derived photosynthates in growth of organs below ground and in the respiratory activities of both nodules and supporting roots. Although nitrate-dependent plants developed larger shoot systems than those relying on nodules, the distribution of carbon and nitrogen to leaves decreased markedly as branches extended during early reproductive growth. The respiration of roots on nodulated plants became more efficient during the later stages of fruit growth whereas the population of secondary nodules present at this stage of development respired less efficiently (mg C consumed per mg N assimilated) than the primary nodules present earlier during development.
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Claims 11
Claim · model-written summary
Nitrate supplied non-nodulated cowpea assimilated nitrogen more rapidly than Rhizobium dependent plants.
- Taxon
- cowpea
Vigna unguiculatae0 - Material
- cv. K 2809e0
- Treatment
- abundant inorganic nitrogene0
- Interactor
- Rhizobium CB 756e0symbiont
- Outcome
- assimilated Ne0
- Direction
- more rapidlye0
- Comparator
- plants dependent on Rhizobium CB 756e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-nodulated plants of cowpea cv. K 2809 supplied with abundant inorganic nitrogen not only assimilated N more rapidly but also produced larger total dry weights and seed yields than plants dependent on Rhizobium CB 756.”
Claim · model-written summary
Nitrate supplied non-nodulated cowpea had larger dry weight and seed yield than Rhizobium dependent plants.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- abundant inorganic nitrogene0
- Interactor
- Rhizobium CB 756e0symbiont
- Outcome
- total dry weights and seed yieldse0
- Direction
- largere0
- Comparator
- plants dependent on Rhizobium CB 756e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-nodulated plants of cowpea cv. K 2809 supplied with abundant inorganic nitrogen not only assimilated N more rapidly but also produced larger total dry weights and seed yields than plants dependent on Rhizobium CB 756.”
Claim · model-written summary
Nitrogen remobilization began sooner in nitrate dependent plants than nodulated plants.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- vegetative organse0
- Outcome
- Remobilization of nitrogene0
- Direction
- soonere0
- Comparator
- nodulated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Remobilization of nitrogen from vegetative organs started sooner in nitrate-dependent than in nodulated plants”
t0“Cowpea”
Claim · model-written summary
Remobilization supplied 69% of mature fruit nitrogen in nitrate dependent plants.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- N content of mature fruitse0
- Value
- 69e0
- Qualifier
- nitrate-dependente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Remobilization of nitrogen from vegetative organs started sooner in nitrate-dependent than in nodulated plants and contributed 69 and 47%, respectively, to the N content of mature fruits.”
t0“Cowpea”
Claim · model-written summary
Remobilization supplied 47% of mature fruit nitrogen in nodulated plants.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- N content of mature fruitse0
- Value
- 47%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“contributed 69 and 47%, respectively, to the N content of mature fruits.”
t0“Cowpea”
Claim · model-written summary
Nodule dependent plants relied more on current nitrogen assimilation during later fruit growth.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- later stages of fruit growthe0
- Outcome
- current assimilation of nitrogene0
- Direction
- moree0
- Comparator
- those given inorganic Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants dependent on nodules relied more on current assimilation of nitrogen during the later stages of fruit growth than those given inorganic N”
t0“Cowpea”
Claim · model-written summary
Nodule dependent plants used more shoot photosynthate below ground and for nodule and root respiration.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- nodules and supporting rootse0
- Outcome
- shoot-derived photosynthatese0
- Direction
- larger proportione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they also utilized a larger proportion of shoot-derived photosynthates in growth of organs below ground and in the respiratory activities of both nodules and supporting roots.”
t0“Cowpea”
Claim · model-written summary
Nitrate dependent plants developed larger shoot systems.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- shoot systemse0
- Direction
- largere0
- Comparator
- those relying on nodulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate-dependent plants developed larger shoot systems than those relying on nodules”
t0“Cowpea”
Claim · model-written summary
Carbon and nitrogen allocation to leaves declined as branches extended.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- leavese0
- Outcome
- distribution of carbon and nitrogen to leavese0
- Direction
- decreased markedlye0
- Qualifier
- during early reproductive growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the distribution of carbon and nitrogen to leaves decreased markedly as branches extended during early reproductive growth.”
t0“Cowpea”
Claim · model-written summary
Root respiration in nodulated plants became more efficient late in fruit growth.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- later stages of fruit growthe0
- Outcome
- respiration of rootse0
- Direction
- more efficiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The respiration of roots on nodulated plants became more efficient during the later stages of fruit growth”
t0“Cowpea”
Claim · model-written summary
Secondary nodules respired less efficiently than earlier primary nodules.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- secondary nodules present at this stage of development respirede0
- Direction
- less efficientlye0
- Comparator
- primary nodulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“secondary nodules present at this stage of development respired less efficiently (mg C consumed per mg N assimilated) than the primary nodules present earlier during development.”
t0“Cowpea”
The same questions in other papers
nitrogen · yield · Vigna unguiculata (cowpea)Results differ
61 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- negative
- no effect
64 papers more in this group
See all 68 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.