Abstract
Abstract Uptake and assimilation of inorganic N in young rice plants has been studied with labelled N (N-15). Depletion of the plants' carbohydrate content, obtained by a preceding dark period, resulted in a drastic reduction of NH4 +-N uptake. Plants exposed to low light intensity showed diminishing NH4 +-N uptake rates as compared with plants exposed to full light intensity, the latter showing constant NH4 +-N uptake rates during the whole experimental period. The percentage of labelled insoluble N in total labelled N was not significantly affected by a preceding dark period, whereas the low light intensity resulted in a lower proportion of insoluble N in roots and shoots. The incorporation of labelled N into the insoluble fraction (proteins, nucleic acids) was higher in plants fed with NH4 +-N than in those fed with NO3 -. The uptake of NH4 +-N was not significantly affected by NO3 -, whereas the NO3- uptake rate was considerably reduced in the presence of NH4 +-N. Low energy status of plants affected the nitrate uptake more than the uptake of NH4 +-N. The results show that uptake and assimilation of inorganic N depend much on the energetic status of plants. Nitrate uptake and assimilation is more sensitive to low energy conditions than NH4 +-N.
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Claims 10
Claim · model-written summary
Carbohydrate depletion after darkness drastically reduced ammonium nitrogen uptake.
- Taxon
- rice
Oryza sativae1 - Treatment
- a preceding dark periode0
- Outcome
- NH4 +-N uptakee0
- Direction
- drastic reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Depletion of the plants' carbohydrate content, obtained by a preceding dark period, resulted in a drastic reduction of NH4 +-N uptake”
e1“young rice plants”
Claim · model-written summary
Low light reduced ammonium nitrogen uptake relative to full light.
- Taxon
- riceOryza sativae1
- Treatment
- low light intensitye0
- Outcome
- NH4 +-N uptake ratese0
- Direction
- diminishinge0
- Comparator
- full light intensitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants exposed to low light intensity showed diminishing NH4 +-N uptake rates as compared with plants exposed to full light intensity”
e1“young rice plants”
Claim · model-written summary
Full light maintained constant ammonium nitrogen uptake rates.
- Taxon
- riceOryza sativae2
- Treatment
- full light intensitye1
- Outcome
- NH4 +-N uptake ratese0
- Direction
- constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the latter showing constant NH4 +-N uptake rates during the whole experimental period”
e1“plants exposed to full light intensity”
e2“young rice plants”
Claim · model-written summary
A preceding dark period did not significantly affect the percentage of labelled insoluble nitrogen.
- Taxon
- riceOryza sativae1
- Treatment
- a preceding dark periode0
- Outcome
- percentage of labelled insoluble N in total labelled Ne0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of labelled insoluble N in total labelled N was not significantly affected by a preceding dark period”
e1“young rice plants”
Claim · model-written summary
Low light lowered the proportion of insoluble nitrogen in roots and shoots.
- Taxon
- riceOryza sativae1
- Organ / stage
- roots and shootse0
- Treatment
- low light intensitye0
- Outcome
- proportion of insoluble Ne0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the low light intensity resulted in a lower proportion of insoluble N in roots and shoots”
e1“young rice plants”
Claim · model-written summary
Ammonium feeding produced higher incorporation of labelled nitrogen into the insoluble fraction than nitrate feeding.
- Taxon
- riceOryza sativae1
- Treatment
- NH4 +-Ne0
- Outcome
- incorporation of labelled N into the insoluble fractione0
- Direction
- highere0
- Comparator
- NO3 -e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The incorporation of labelled N into the insoluble fraction (proteins, nucleic acids) was higher in plants fed with NH4 +-N than in those fed with NO3 -”
e1“young rice plants”
Claim · model-written summary
Nitrate did not significantly affect ammonium uptake.
- Taxon
- riceOryza sativae1
- Treatment
- NO3 -e0
- Outcome
- uptake of NH4 +-Ne0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The uptake of NH4 +-N was not significantly affected by NO3 -”
e1“young rice plants”
Claim · model-written summary
Ammonium considerably reduced nitrate uptake.
- Taxon
- riceOryza sativae1
- Treatment
- NH4 +-Ne0
- Outcome
- NO3- uptake ratee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the NO3- uptake rate was considerably reduced in the presence of NH4 +-N”
e1“young rice plants”
Claim · model-written summary
Low energy status affected nitrate uptake more than ammonium uptake.
- Taxon
- riceOryza sativae1
- Treatment
- Low energy statuse0
- Outcome
- nitrate uptakee0
- Direction
- more thane0
- Comparator
- uptake of NH4 +-Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low energy status of plants affected the nitrate uptake more than the uptake of NH4 +-N”
e1“young rice plants”
Claim · model-written summary
Nitrate uptake and assimilation were more sensitive to low energy than ammonium nitrogen.
- Taxon
- riceOryza sativae1
- Treatment
- low energy conditionse0
- Outcome
- Nitrate uptake and assimilatione0
- Direction
- more sensitivee0
- Comparator
- NH4 +-Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate uptake and assimilation is more sensitive to low energy conditions than NH4 +-N”
e1“young rice plants”
The same questions in other papers
light · nutrient: content · Oryza sativa (rice)Positive and negative results
8 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
12 papers more in this group
See all 16 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.