Abstract
The effect of the nitrogen source (gaseous nitrogen, N2, or nitrate ions, NO3-) on the use of carbon (C) for root and nodule growth of pea (Pisum sativum L.) was investigated using 13C-labelling of assimilated CO2 at various stages of growth. Nitrate supply and growing conditions (sowing dates, air CO2 concentration) were varied to alter photosynthetic rates. Nodules are the sink with the highest demand for C in both the vegetative and flowering stages, growing at the expense of shoot and root in the vegetative stage, but only at the expense of roots at flowering. Until flowering, the addition of C into root and nodule biomass was linearly related to pre-existing biomass, thus determining net sink strengths which decreased with root and nodule age. Nodule growth patterns did not depend on the N source, whereas root growth was increased by nitrate when nodule biomass was low. At seed filling, the increase in C of biomass of the root system was no longer related to pre-existing biomass and C was preferentially diverted to roots of plants assimilating nitrate, or to nodules for plants fixing N2.
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Claims 10
Claim · model-written summary
Nodules had the highest carbon demand in vegetative and flowering stages.
- Taxon
- Pisum sativum L.
Lathyrus oleraceust0 - Organ / stage
- Nodulese0
- Outcome
- highest demand for Ce0
- Qualifier
- in both the vegetative and flowering stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodules are the sink with the highest demand for C in both the vegetative and flowering stages, growing at the expense of shoot and root in the vegetative stage, but only at the expense of roots at flowering.”
t0“Pisum sativum L.”
Claim · model-written summary
Vegetative nodule growth came at the expense of shoot and root growth.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Organ / stage
- vegetative stagee0
- Outcome
- growing at the expense of shoot and roote0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodules are the sink with the highest demand for C in both the vegetative and flowering stages, growing at the expense of shoot and root in the vegetative stage, but only at the expense of roots at flowering.”
t0“Pisum sativum L.”
Claim · model-written summary
At flowering, nodule growth came only at the expense of roots.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Organ / stage
- floweringe0
- Outcome
- only at the expense of rootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodules are the sink with the highest demand for C in both the vegetative and flowering stages, growing at the expense of shoot and root in the vegetative stage, but only at the expense of roots at flowering.”
t0“Pisum sativum L.”
Claim · model-written summary
Before flowering, carbon addition to root and nodule biomass scaled linearly with existing biomass.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Organ / stage
- root and nodulee0
- Outcome
- addition of C into root and nodule biomasse0
- Comparator
- pre-existing biomasse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Until flowering, the addition of C into root and nodule biomass was linearly related to pre-existing biomass, thus determining net sink strengths which decreased with root and nodule age.”
t0“Pisum sativum L.”
Claim · model-written summary
Root and nodule sink strengths declined with age.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Organ / stage
- root and nodulee0
- Outcome
- net sink strengthse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Until flowering, the addition of C into root and nodule biomass was linearly related to pre-existing biomass, thus determining net sink strengths which decreased with root and nodule age.”
t0“Pisum sativum L.”
Claim · model-written summary
Nodule growth patterns did not depend on nitrogen source.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Treatment
- N sourcee0
- Outcome
- Nodule growth patternse0
- Direction
- did not depende0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule growth patterns did not depend on the N source, whereas root growth was increased by nitrate when nodule biomass was low.”
t0“Pisum sativum L.”
Claim · model-written summary
Nitrate increased root growth when nodule biomass was low.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Treatment
- nitratee0
- Outcome
- root growthe0
- Direction
- increasede0
- Qualifier
- when nodule biomass was lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule growth patterns did not depend on the N source, whereas root growth was increased by nitrate when nodule biomass was low.”
t0“Pisum sativum L.”
Claim · model-written summary
At seed filling, carbon increase in root system biomass ceased to relate to existing biomass.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Organ / stage
- seed fillinge0
- Outcome
- increase in C of biomass of the root systeme0
- Direction
- no longer relatede0
- Comparator
- pre-existing biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At seed filling, the increase in C of biomass of the root system was no longer related to pre-existing biomass and C was preferentially diverted to roots of plants assimilating nitrate, or to nodules for plants fixing N2.”
t0“Pisum sativum L.”
Claim · model-written summary
At seed filling, nitrate assimilating plants allocated carbon preferentially to roots.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Organ / stage
- seed fillinge0
- Treatment
- nitratee0
- Outcome
- C was preferentially diverted to rootse0
- Direction
- preferentiallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At seed filling, the increase in C of biomass of the root system was no longer related to pre-existing biomass and C was preferentially diverted to roots of plants assimilating nitrate, or to nodules for plants fixing N2.”
t0“Pisum sativum L.”
Claim · model-written summary
At seed filling, nitrogen fixing plants allocated carbon preferentially to nodules.
- Taxon
- Pisum sativum L.Lathyrus oleraceust0
- Organ / stage
- seed fillinge0
- Treatment
- N2e0
- Outcome
- to nodules for plants fixing N2e0
- Direction
- preferentiallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At seed filling, the increase in C of biomass of the root system was no longer related to pre-existing biomass and C was preferentially diverted to roots of plants assimilating nitrate, or to nodules for plants fixing N2.”
t0“Pisum sativum L.”
The same questions in other papers
nitrogen · growth · Lathyrus oleraceus (pea)Positive and negative results
18 papers in the same direction as this paper · 15 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- positive
- no effect
31 papers more in this group
See all 35 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.