Abstract
Nitrogen remobilization is essential for nitrogen economy at the whole plant level. 15N tracing experiments showed that the Arabidopsis leaf to leaf N-remobilisation at vegetative stage was mainly determined by leaf senescence severity while N-remobilisation from rosette to seeds is depending on harvest index (Diaz et al. 2008). N-remobilisation efficiency to the seeds was higher in N limiting conditions (Lemaître et al. 2008). In order to investigate natural variation of nitrogen uptake and remobilisation in Arabidopsis, a core collection of accessions was grown at low (N-) and high (N+) nitrate supplies. Plants were labelled using 15N nitrate and traits measured (15N partition, nitrogen concentrations, remobilisation, biomass, yield, flowering). Globally, it was observed that the late-flowering plants had higher vegetative biomass, lower seed biomass and heavier seeds at both N+ and N- conditions. As a result, the late-flowering genotypes had lower harvest index (HI), higher nitrogen harvest index (NHI), higher 15N partitioning in seeds (15NHI), and lower fertility. All the accessions studied responded to low nitrogen nutrition by decreasing plant biomass, by lowering the amount of residual nitrogen lost in the dry remains (N%DR), and by increasing N-remobilisation (15NHI) and allocation of post-labelling assimilated nitrogen to the seeds. The most striking results were provided by the 15N tracing experiments, demonstrating that the amount of 15N, first assimilated into the rosette, and further remobilised to the seeds, is highly dependent on sink/source biomass ratio, i.e. on harvest index. Trait variations allowed us to group accessions in different feature-classes and to detect genotypes showing opposite or extreme behaviours. Results provided will facilitate the choice of recombinant inbred line parents for further QTL experiments. N-remobilisation was investigated for mutants of interest, using the same labelling protocol than for accessions. References : Diaz et al. (2008) Plant Physiology 147 : 1437-1449 Lemaître et al. (2008) Plant Cell Physiology 49(7): 1056-1065
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Claims 13
Claim · model-written summary
Late-flowering Arabidopsis had higher vegetative biomass at both nitrogen supplies.
- Taxon
- Arabidopsis
Arabidopsise1 - Organ / stage
- late-floweringe0
- Outcome
- vegetative biomasse0
- Direction
- highere0
- Setting
- N+ and N- conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-flowering plants had higher vegetative biomass, lower seed biomass and heavier seeds at both N+ and N- conditions”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Late-flowering Arabidopsis had lower seed biomass at both nitrogen supplies.
- Taxon
- ArabidopsisArabidopsise1
- Organ / stage
- late-floweringe0
- Outcome
- seed biomasse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-flowering plants had higher vegetative biomass, lower seed biomass and heavier seeds at both N+ and N- conditions”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Late-flowering Arabidopsis had heavier seeds.
- Taxon
- ArabidopsisArabidopsise1
- Organ / stage
- late-floweringe0
- Outcome
- seedse0
- Direction
- heaviere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-flowering plants had higher vegetative biomass, lower seed biomass and heavier seeds at both N+ and N- conditions”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Late-flowering genotypes had lower harvest index.
- Taxon
- ArabidopsisArabidopsise1
- Organ / stage
- late-floweringe0
- Outcome
- harvest indexe0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-flowering genotypes had lower harvest index (HI), higher nitrogen harvest index (NHI), higher 15N partitioning in seeds (15NHI), and lower fertility”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Late-flowering genotypes had higher nitrogen harvest index.
- Taxon
- ArabidopsisArabidopsise1
- Organ / stage
- late-floweringe0
- Outcome
- nitrogen harvest indexe0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-flowering genotypes had lower harvest index (HI), higher nitrogen harvest index (NHI), higher 15N partitioning in seeds (15NHI), and lower fertility”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Late-flowering genotypes had higher 15N partitioning in seeds.
- Taxon
- ArabidopsisArabidopsise1
- Organ / stage
- late-floweringe0
- Outcome
- 15N partitioning in seedse0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-flowering genotypes had lower harvest index (HI), higher nitrogen harvest index (NHI), higher 15N partitioning in seeds (15NHI), and lower fertility”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Late-flowering genotypes had lower fertility.
- Taxon
- ArabidopsisArabidopsise1
- Organ / stage
- late-floweringe0
- Outcome
- fertilitye0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-flowering genotypes had lower harvest index (HI), higher nitrogen harvest index (NHI), higher 15N partitioning in seeds (15NHI), and lower fertility”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Low nitrogen decreased plant biomass.
- Taxon
- ArabidopsisArabidopsise1
- Treatment
- low nitrogen nutritione0
- Outcome
- plant biomasse0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the accessions studied responded to low nitrogen nutrition by decreasing plant biomass, by lowering the amount of residual nitrogen lost in the dry remains (N%DR), and by increasing N-remobilisation (15NHI) and allocation of post-labelling assimilated nitrogen to the seeds”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Low nitrogen lowered residual nitrogen lost in dry remains.
- Taxon
- ArabidopsisArabidopsise1
- Treatment
- low nitrogen nutritione0
- Outcome
- amount of residual nitrogen lost in the dry remainse0
- Direction
- loweringe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the accessions studied responded to low nitrogen nutrition by decreasing plant biomass, by lowering the amount of residual nitrogen lost in the dry remains (N%DR), and by increasing N-remobilisation (15NHI) and allocation of post-labelling assimilated nitrogen to the seeds”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Low nitrogen increased nitrogen remobilization.
- Taxon
- ArabidopsisArabidopsise1
- Treatment
- low nitrogen nutritione0
- Outcome
- N-remobilisation (15NHI)e0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the accessions studied responded to low nitrogen nutrition by decreasing plant biomass, by lowering the amount of residual nitrogen lost in the dry remains (N%DR), and by increasing N-remobilisation (15NHI) and allocation of post-labelling assimilated nitrogen to the seeds”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Low nitrogen increased allocation of newly assimilated nitrogen to seeds.
- Taxon
- ArabidopsisArabidopsise1
- Treatment
- low nitrogen nutritione0
- Outcome
- allocation of post-labelling assimilated nitrogen to the seedse0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the accessions studied responded to low nitrogen nutrition by decreasing plant biomass, by lowering the amount of residual nitrogen lost in the dry remains (N%DR), and by increasing N-remobilisation (15NHI) and allocation of post-labelling assimilated nitrogen to the seeds”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Rosette nitrogen remobilization to seeds depended strongly on sink/source biomass ratio.
- Taxon
- ArabidopsisArabidopsise1
- Organ / stage
- rosettee0
- Outcome
- amount of 15N, first assimilated into the rosette, and further remobilised to the seedse0
- Qualifier
- sink/source biomass ratioe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of 15N, first assimilated into the rosette, and further remobilised to the seeds, is highly dependent on sink/source biomass ratio, i.e. on harvest index”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”
Claim · model-written summary
Trait variation grouped accessions into feature classes and identified extreme or opposite genotypes.
- Taxon
- ArabidopsisArabidopsise1
- Outcome
- group accessions in different feature-classes and to detect genotypes showing opposite or extreme behaviourse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trait variations allowed us to group accessions in different feature-classes and to detect genotypes showing opposite or extreme behaviours”
t0“Nitrogen retranslocation during senescence in plants”
e1“in Arabidopsis, a core collection of accessions”