Abstract
A very significant increase in N 2 (C 2 H 2 ) reduction by Visum sativum L. infected with Rhizobium leguminosarum occurred when plants were grown in the light with 6 hr of CO 2 enrichment (0.00120 atm). Plants grown for 4 wk under 0.00120 atm CO 2 showed significant increases over control plants at 0.00032 atm CO 2 in plant dry weight, N content, root nodule mass, number of nodules, and mean nodule dry weight. Acetylene‐reduction assays, however, revealed no reproducible increase in nitrogenase activity/mg nodule in plants subjected to long‐term CO 2 enrichment. Both control and CO 2 ‐enriched plants optimized the sink/source ratio between the mass of nodules and the extranodular plant mass. The optimum ratio for N 2 reduction by 4‐week‐old peas was 0.05. Long‐term CO 2 enrichment did not promote root nodule formation to a greater degree than total plant development, and increases in N content were directly proportional to increases in nodule mass. Morphological data revealed significantly greater deposits of starch in root nodules of plants grown under CO 2 ‐enriched conditions. The results are interpreted as showing that short‐term increases in CO 2 levels promote N 2 reduction by affecting root nodule functioning, whereas long‐term CO 2 enrichment promotes N 2 reduction by increasing total plant and root nodule development.
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Claims 7
Claim · model-written summary
Six hours of CO2 enrichment significantly increased nitrogen reduction in inoculated peas.
- Taxon
- Visum sativum L.e0
- Treatment
- 6 hr of CO 2 enrichment (0.00120 atm)e0
- Interactor
- Rhizobium leguminosarum
Rhizobium leguminosarume0symbiont - Outcome
- N 2 (C 2 H 2 ) reductione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A very significant increase in N 2 (C 2 H 2 ) reduction by Visum sativum L. infected with Rhizobium leguminosarum occurred when plants were grown in the light with 6 hr of CO 2 enrichment (0.00120 atm)”
Claim · model-written summary
Long-term CO2 enrichment significantly increased plant dry weight, nitrogen content, nodule mass, nodule number and mean nodule dry weight.
Verbatim
e0“Plants grown for 4 wk under 0.00120 atm CO 2 showed significant increases over control plants at 0.00032 atm CO 2 in plant dry weight, N content, root nodule mass, number of nodules, and mean nodule dry weight”
t0“PISUM SATIVUM L.”
Claim · model-written summary
Long-term CO2 enrichment produced no reproducible increase in nitrogenase activity per nodule mass.
- Taxon
- PISUM SATIVUM L.t0
- Treatment
- long‐term CO 2 enrichmente0
- Outcome
- nitrogenase activity/mg nodulee0
- Direction
- no reproducible increasee0
Not reportedComparator
Verbatim
e0“no reproducible increase in nitrogenase activity/mg nodule in plants subjected to long‐term CO 2 enrichment”
t0“PISUM SATIVUM L.”
Claim · model-written summary
The optimum nodule to extranodular mass ratio for nitrogen reduction in four-week-old peas was 0.05.
- Taxon
- peas
Lathyrus oleraceuse0 - Outcome
- optimum ratio for N 2 reductione0
- Value
- 0.05e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum ratio for N 2 reduction by 4‐week‐old peas was 0.05”
Claim · model-written summary
Long-term CO2 enrichment did not increase nodule formation beyond the increase in whole-plant development.
Verbatim
e0“Long‐term CO 2 enrichment did not promote root nodule formation to a greater degree than total plant development”
t0“PISUM SATIVUM L.”
Claim · model-written summary
Nitrogen content increases were proportional to nodule mass increases.
Verbatim
e0“increases in N content were directly proportional to increases in nodule mass”
t0“PISUM SATIVUM L.”
Claim · model-written summary
CO2-enriched peas had significantly greater starch deposits in root nodules.
- Taxon
- PISUM SATIVUM L.t0
- Treatment
- CO 2 ‐enriched conditionse0
- Outcome
- deposits of starche0
- Direction
- greatere0
Not reportedComparator
Verbatim
e0“significantly greater deposits of starch in root nodules of plants grown under CO 2 ‐enriched conditions”
t0“PISUM SATIVUM L.”
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