Abstract
Abstract The effect of photosynthetic photon flux density (PPFD) on nitrogen utilization was determined in peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum and treated with nutrient solutions containing no combined nitrogen, 16 m M NO 3 − , or 16 m M NH 4 + . Plants were grown under controlled conditions at three PPFD values ranging from severely limiting to nearly saturating. Carboxylation efficiencies and CO 2 ‐exchange rates were highest in the N 2 ‐fixing plants and lowest in plants supplied with NH 4 + , and they generally increased with increasing PPFD. Photoefficiencies increased with PPFD but did not differ appreciably with the form of nitrogen applied. Nitrogen fixation, calculated from C 2 H 2 ‐reduction and H 2 ‐evolution data, was inhibited more by NH 4 + than by NO 3 − application. Inhibition was counteracted by increasing PPFD. Percentage nitrogen decreased with increasing PPFD in plants treated with combined nitrogen and increased in the plants dependent on N 2 fixation. The data reveal that photosynthetic efficiency and the capacity to fix N 2 in peas are functions of PPFD and the availability of combined nitrogen and that these two factors are interrelated.
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Claims 8
Claim · model-written summary
N2-fixing peas had the highest carboxylation efficiency and CO2 exchange, while ammonium-fed plants had the lowest.
- Taxon
- Pisum sativum
Lathyrus oleraceust0 - Interactor
- Rhizobium leguminosarum
Rhizobium leguminosarume1symbiont - Outcome
- Carboxylation efficiencies and CO 2 ‐exchange ratese0
- Direction
- higheste0
- Comparator
- plants supplied with NH 4 +e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carboxylation efficiencies and CO 2 ‐exchange rates were highest in the N 2 ‐fixing plants and lowest in plants supplied with NH 4 + , and they generally increased with increasing PPFD.”
t0“Pisum sativum”
e1“peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum”
Claim · model-written summary
Carboxylation efficiency and CO2 exchange generally increased with PPFD.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- increasing PPFDe0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume1symbiont
- Outcome
- Carboxylation efficiencies and CO 2 ‐exchange ratese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carboxylation efficiencies and CO 2 ‐exchange rates were highest in the N 2 ‐fixing plants and lowest in plants supplied with NH 4 + , and they generally increased with increasing PPFD.”
t0“Pisum sativum”
e1“peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum”
Claim · model-written summary
Photoefficiency increased with PPFD.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- PPFDe0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume1symbiont
- Outcome
- Photoefficienciese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photoefficiencies increased with PPFD but did not differ appreciably with the form of nitrogen applied.”
t0“Pisum sativum”
e1“peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum”
Claim · model-written summary
Photoefficiency did not differ appreciably among nitrogen forms.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- form of nitrogen appliede0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume1symbiont
- Outcome
- Photoefficienciese0
- Direction
- did not differ appreciablye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photoefficiencies increased with PPFD but did not differ appreciably with the form of nitrogen applied.”
t0“Pisum sativum”
e1“peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum”
Claim · model-written summary
Ammonium inhibited nitrogen fixation more than nitrate application.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- NH 4 +e0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume1symbiont
- Outcome
- Nitrogen fixatione0
- Direction
- inhibited moree0
- Comparator
- NO 3 − applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fixation, calculated from C 2 H 2 ‐reduction and H 2 ‐evolution data, was inhibited more by NH 4 + than by NO 3 − application.”
t0“Pisum sativum”
e1“peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum”
Claim · model-written summary
Increasing PPFD counteracted inhibition of nitrogen fixation.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- increasing PPFDe0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume1symbiont
- Outcome
- Inhibitione0
- Direction
- counteractede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibition was counteracted by increasing PPFD.”
t0“Pisum sativum”
e1“peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum”
Claim · model-written summary
Nitrogen percentage decreased with PPFD in combined-nitrogen-fed peas.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- increasing PPFDe0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume1symbiont
- Outcome
- Percentage nitrogene0
- Direction
- decreasede0
- Qualifier
- plants treated with combined nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percentage nitrogen decreased with increasing PPFD in plants treated with combined nitrogen and increased in the plants dependent on N 2 fixation.”
t0“Pisum sativum”
e1“peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum”
Claim · model-written summary
Nitrogen percentage increased with PPFD in nitrogen-fixing peas.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- increasing PPFDe0
- Interactor
- Rhizobium leguminosarumRhizobium leguminosarume1symbiont
- Outcome
- Percentage nitrogene0
- Direction
- increasede0
- Qualifier
- plants dependent on N 2 fixatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percentage nitrogen decreased with increasing PPFD in plants treated with combined nitrogen and increased in the plants dependent on N 2 fixation.”
t0“Pisum sativum”
e1“peas (Pisum sativum L. cv. Alaska) inoculated with Rhizobium leguminosarum”
The same questions in other papers
nitrogen · Rhizobium leguminosarum · Lathyrus oleraceus (pea)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
light · Rhizobium leguminosarum · Lathyrus oleraceus (pea)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.