Abstract
The influence of P on N 2 fixation and dry matter production of young pea ( Pisum sativum L. cv. Bodil) plants grown in a soil‐sand mixture was investigated in growth cabinet experiments. Nodule dry weight, specific C 2 H 2 reduction and P concentration in shoots responded to P addition before any growth response could be observed. The P concentration in nodules responded only slightly to P addition. A supply of P to P‐deficient plants increased both the nodule dry weight, specific C 2 H 2 reduction and P concentration in shoots relatively faster than it increased shoot dry weight and P concentration in nodules. Combined N applied to plants when N 2 fixation had commenced, increased shoot dry weight only at the highest P levels. This indicates that the smaller plant growth at the low P levels did not result from N deficiency. The reduced nodulation and N 2 fixation in P‐deficient plants seem to be caused by impaired shoot metabolism and not by a direct effect of P deficiency of the nodules.
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Claims 8
Claim · model-written summary
Nodule dry weight, specific C2H2 reduction and shoot P concentration responded before growth.
- Taxon
- pea
Lathyrus oleraceust0 - Treatment
- P additione0
- Outcome
- Nodule dry weight, specific C 2 H 2 reduction and P concentration in shootse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule dry weight, specific C 2 H 2 reduction and P concentration in shoots responded to P addition before any growth response could be observed.”
t0“pea plants”
Claim · model-written summary
Nodule P concentration responded only slightly to P addition.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- P additione0
- Outcome
- P concentration in nodulese0
- Qualifier
- only slightlye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The P concentration in nodules responded only slightly to P addition.”
t0“pea plants”
Claim · model-written summary
P supply raised nodule dry weight faster than shoot dry weight.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- supply of P to P‐deficient plantse0
- Outcome
- nodule dry weighte0
- Direction
- increasede0
- Qualifier
- relatively fastere0
- Comparator
- shoot dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A supply of P to P‐deficient plants increased both the nodule dry weight, specific C 2 H 2 reduction and P concentration in shoots relatively faster than it increased shoot dry weight and P concentration in nodules.”
t0“pea plants”
Claim · model-written summary
P supply raised specific C2H2 reduction faster than shoot dry weight.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- supply of P to P‐deficient plantse0
- Outcome
- specific C 2 H 2 reductione0
- Direction
- increasede0
- Qualifier
- relatively fastere0
- Comparator
- shoot dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A supply of P to P‐deficient plants increased both the nodule dry weight, specific C 2 H 2 reduction and P concentration in shoots relatively faster than it increased shoot dry weight and P concentration in nodules.”
t0“pea plants”
Claim · model-written summary
P supply raised shoot P concentration faster than nodule P concentration.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- supply of P to P‐deficient plantse0
- Outcome
- P concentration in shootse0
- Direction
- increasede0
- Qualifier
- relatively fastere0
- Comparator
- P concentration in nodulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A supply of P to P‐deficient plants increased both the nodule dry weight, specific C 2 H 2 reduction and P concentration in shoots relatively faster than it increased shoot dry weight and P concentration in nodules.”
t0“pea plants”
Claim · model-written summary
Combined N increased shoot dry weight only at highest P levels.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- Combined Ne0
- Outcome
- shoot dry weighte0
- Direction
- increasede0
- Qualifier
- only at the highest P levelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combined N applied to plants when N 2 fixation had commenced, increased shoot dry weight only at the highest P levels.”
t0“pea plants”
Claim · model-written summary
Low-P growth reduction was interpreted as not caused by N deficiency.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- smaller plant growthe0
- Qualifier
- did not result from N deficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the smaller plant growth at the low P levels did not result from N deficiency”
t0“pea plants”
Claim · model-written summary
Reduced nodulation and fixation under P deficiency were attributed to impaired shoot metabolism.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- reduced nodulation and N 2 fixatione0
- Qualifier
- impaired shoot metabolisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduced nodulation and N 2 fixation in P‐deficient plants seem to be caused by impaired shoot metabolism and not by a direct effect of P deficiency of the nodules.”
t0“pea plants”
The same questions in other papers
phosphorus · symbiosis · Lathyrus oleraceus (pea)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
4 papers more in this group
See all 8 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.