Abstract
Abstract The effect of low light intensity and suboptimal potassium supply on the fixation of molecular nitrogen by root nodules and the nitrogen turnover in the host plant was studied in Medicago sativa using 15 N labelled molecular nitrogen. For the application of 15 N 2 labelled gas a special box was used. Both low light intensity and a low potassium supply resulted in a substantial growth depression. In particular the protein content of tops, roots and nodules was lower in the plants of the low light intensity treatment as compared with the control plants. Decreasing potassium supply had a similar but less‐pronounced effect on protein content. The low protein content was not a consequence of a lack of soluble amino nitrogen or NH 3 , since these fractions were influenced to a lesser degree by the reduced light intensity and by the low potassium supply. This observation is supported by the data obtained with 15 N. N 2 fixation and NH 3 assimilation were affected by both low light intensity and low K application to the same degree as the overall metabolism, thus showing no particular response to the treatments applied.
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Claims 6
Claim · model-written summary
Low light substantially depressed lucerne growth.
- Taxon
- Medicago sativa
Medicago sativae1 - Treatment
- low light intensitye0
- Outcome
- growthe0
- Direction
- depressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both low light intensity and a low potassium supply resulted in a substantial growth depression.”
e1“studied in Medicago sativa”
Claim · model-written summary
Low potassium substantially depressed lucerne growth.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- low potassium supplye0
- Outcome
- growthe0
- Direction
- depressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both low light intensity and a low potassium supply resulted in a substantial growth depression.”
e1“studied in Medicago sativa”
Claim · model-written summary
Low light reduced protein content in lucerne tops, roots and nodules.
- Taxon
- Medicago sativaMedicago sativae1
- Organ / stage
- tops, roots and nodulese0
- Treatment
- low light intensity treatmente0
- Outcome
- protein contente0
- Direction
- lowere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the protein content of tops, roots and nodules was lower in the plants of the low light intensity treatment as compared with the control plants”
e1“studied in Medicago sativa”
Claim · model-written summary
Reduced potassium similarly but less strongly lowered protein content.
- Taxon
- Medicago sativaMedicago sativae2
- Treatment
- Decreasing potassium supplye0
- Outcome
- protein contente0
- Direction
- lowere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreasing potassium supply had a similar but less‐pronounced effect on protein content.”
e1“protein content of tops, roots and nodules was lower”
e2“studied in Medicago sativa”
Claim · model-written summary
Soluble amino nitrogen and NH3 fractions changed less than protein under reduced light and potassium.
- Taxon
- Medicago sativaMedicago sativae2
- Treatment
- reduced light intensitye0
- Outcome
- soluble amino nitrogen or NH 3e1
- Direction
- lesser degreee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these fractions were influenced to a lesser degree by the reduced light intensity and by the low potassium supply”
e1“soluble amino nitrogen or NH 3”
e2“studied in Medicago sativa”
Claim · model-written summary
Nitrogen fixation and ammonia assimilation tracked overall metabolism under low light and low potassium without a distinct response.
- Taxon
- Medicago sativaMedicago sativae1
- Treatment
- low light intensity and low K applicatione0
- Outcome
- N 2 fixation and NH 3 assimilatione0
- Direction
- no particular responsee0
- Comparator
- overall metabolisme0
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N 2 fixation and NH 3 assimilation were affected by both low light intensity and low K application to the same degree as the overall metabolism, thus showing no particular response to the treatments applied.”
e1“studied in Medicago sativa”
t0“Rhizobium Infected Lucerne”
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