Abstract
Nitrogen (N) is an essential plant growth nutrient whose coordinated distribution from source to sink organs is crucial for seed development and overall crop yield. We compared high and low N use efficiency (NUE) Brassica napus (rapeseed) genotypes. Metabonomics and transcriptomics revealed that leaf senescence induced by N deficiency promoted amino acid allocation from older to younger leaves in the high-NUE genotype at the vegetative growth stage. Efficient source to sink remobilization of amino acids elevated the numbers of branches and pods per plant under a N-deficiency treatment during the reproductive stage. A 15N tracer experiment confirmed that more amino acids were partitioned into seeds from the silique wall during the pod stage in the high-NUE genotype, owing mainly to variation in genes involved in organic N transport and metabolism. We suggest that the greater amino acid source-to-sink allocation efficiency during various growth stages in the high-NUE genotype resulted in higher yield and NUE under N deficiency. These findings support the hypothesis that strong amino acid remobilization in rapeseed leads to high yield, NUE, and harvest index.
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Claims 5
Claim · model-written summary
N deficiency promoted amino acid allocation from older to younger leaves in the high-NUE genotype at the vegetative stage
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Material
- high-NUE genotypee1
- Organ / stage
- vegetative growth stagee1
- Treatment
- N deficiencye1
- Outcome
- amino acid allocation from older to younger leavese1
- Direction
- promotede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“Brassica napus”
e1“Metabonomics and transcriptomics revealed that leaf senescence induced by N deficiency promoted amino acid allocation from older to younger leaves in the high-NUE genotype at the vegetative growth stage”
Claim · model-written summary
Source-to-sink remobilization under N deficiency elevated the numbers of branches and pods per plant during the reproductive stage
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- reproductive stagee2
- Treatment
- N-deficiency treatmente2
- Outcome
- numbers of branches and pods per plante2
- Direction
- elevatede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brassica napus”
e2“Efficient source to sink remobilization of amino acids elevated the numbers of branches and pods per plant under a N-deficiency treatment during the reproductive stage”
Claim · model-written summary
A 15N tracer showed more amino acids partitioned into seeds from the silique wall during the pod stage in the high-NUE genotype
- Taxon
- Brassica napusBrassica napust0
- Material
- high-NUE genotypee3
- Organ / stage
- silique walle3
- Outcome
- amino acids were partitioned into seedse3
- Direction
- moree3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brassica napus”
e3“A 15N tracer experiment confirmed that more amino acids were partitioned into seeds from the silique wall during the pod stage in the high-NUE genotype”
Claim · model-written summary
Variation in genes for organic N transport and metabolism is given as the main reason for more amino acid partitioning into seeds
- Taxon
- Brassica napusBrassica napust0
- Gene
- genes involved in organic N transport and metabolisme4
- Outcome
- amino acids were partitioned into seedse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brassica napus”
e3“A 15N tracer experiment confirmed that more amino acids were partitioned into seeds from the silique wall during the pod stage in the high-NUE genotype”
e4“owing mainly to variation in genes involved in organic N transport and metabolism”
Claim · model-written summary
The high-NUE genotype had higher yield and NUE under N deficiency than the low-NUE genotype (suggested by the authors)
- Taxon
- Brassica napusBrassica napust0
- Material
- high-NUE genotypee5
- Treatment
- N deficiencye5
- Outcome
- yield and NUEe5
- Direction
- highere5
- Comparator
- low N use efficiency (NUE)e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Brassica napus”
e5“in the high-NUE genotype resulted in higher yield and NUE under N deficiency”
e6“We compared high and low N use efficiency (NUE) Brassica napus (rapeseed) genotypes”
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