Abstract
In general, yield and fruit quality strongly rely on efficient nutrient remobilization during plant development and senescence. Transcriptome changes associated with senescence in spring oilseed rape grown under optimal nitrogen supply or mild nitrogen deficiency revealed differences in senescence and nutrient mobilization in old lower canopy leaves and younger higher canopy leaves [1]. Having a closer look at this transcriptome analyses, we identified the major classes of seed storage proteins (SSP) to be expressed in vegetative tissue, namely leaf and stem tissue. Expression of SSPs was not only dependent on the nitrogen supply but transcripts appeared to correlate with intracellular H₂O₂ contents, which functions as well-known signaling molecule in developmental senescence. The abundance of SSPs in leaf material transiently progressed from the oldest leaves to the youngest. Moreover, stems also exhibited short-term production of SSPs, which hints at an interim storage function. In order to decipher whether hydrogen peroxide also functions as a signaling molecule in nitrogen deficiency-induced senescence, we analyzed hydrogen peroxide contents after complete nitrogen depletion in oilseed rape and Arabidopsis plants. In both cases, hydrogen peroxide contents were lower in nitrogen deficient plants, indicating that at least parts of the developmental senescence program appear to be suppressed under nitrogen deficiency.
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Claims 10
Claim · model-written summary
Senescence and nutrient mobilization differed by leaf canopy age under nitrogen supply conditions.
- Taxon
- spring oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Organ / stage
- old lower canopy leaves and younger higher canopy leavese0
- Treatment
- mild nitrogen deficiencye0
- Outcome
- differences in senescence and nutrient mobilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“spring oilseed rape grown under optimal nitrogen supply or mild nitrogen deficiency revealed differences in senescence and nutrient mobilization in old lower canopy leaves and younger higher canopy leaves”
Claim · model-written summary
Seed storage protein classes were expressed in leaf and stem vegetative tissue.
- Taxon
- spring oilseed rapeBrassica napuse0
- Organ / stage
- leaf and stem tissuee1
- Gene
- seed storage proteins (SSP)e1
- Outcome
- expressed in vegetative tissuee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“we identified the major classes of seed storage proteins (SSP) to be expressed in vegetative tissue, namely leaf and stem tissue”
e0“spring oilseed rape grown under optimal nitrogen supply or mild nitrogen deficiency revealed differences in senescence and nutrient mobilization in old lower canopy leaves and younger higher canopy leaves”
Claim · model-written summary
SSP expression depended on nitrogen supply.
- Taxon
- spring oilseed rapeBrassica napuse0
- Treatment
- nitrogen supplye2
- Gene
- SSPse2
- Outcome
- Expression of SSPse2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Expression of SSPs was not only dependent on the nitrogen supply but transcripts appeared to correlate with intracellular H₂O₂ contents”
e0“spring oilseed rape grown under optimal nitrogen supply or mild nitrogen deficiency revealed differences in senescence and nutrient mobilization in old lower canopy leaves and younger higher canopy leaves”
Claim · model-written summary
SSP transcripts appeared to correlate with intracellular peroxide.
- Taxon
- spring oilseed rapeBrassica napuse0
- Gene
- SSPse2
- Compound
- H₂O₂e2
- Outcome
- transcriptse2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Expression of SSPs was not only dependent on the nitrogen supply but transcripts appeared to correlate with intracellular H₂O₂ contents”
e0“spring oilseed rape grown under optimal nitrogen supply or mild nitrogen deficiency revealed differences in senescence and nutrient mobilization in old lower canopy leaves and younger higher canopy leaves”
Claim · model-written summary
Leaf SSP abundance progressed transiently from oldest to youngest leaves.
- Taxon
- spring oilseed rapeBrassica napuse0
- Organ / stage
- oldest leaves to the youngeste3
- Gene
- SSPse3
- Outcome
- abundance of SSPse3
- Direction
- progressede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The abundance of SSPs in leaf material transiently progressed from the oldest leaves to the youngest.”
e0“spring oilseed rape grown under optimal nitrogen supply or mild nitrogen deficiency revealed differences in senescence and nutrient mobilization in old lower canopy leaves and younger higher canopy leaves”
Claim · model-written summary
Stems showed short-term SSP production.
- Taxon
- spring oilseed rapeBrassica napuse0
- Organ / stage
- stemse4
- Gene
- SSPse4
- Outcome
- short-term production of SSPse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“stems also exhibited short-term production of SSPs, which hints at an interim storage function.”
e0“spring oilseed rape grown under optimal nitrogen supply or mild nitrogen deficiency revealed differences in senescence and nutrient mobilization in old lower canopy leaves and younger higher canopy leaves”
Claim · model-written summary
Stem SSP production suggests interim storage.
- Taxon
- spring oilseed rapeBrassica napuse0
- Organ / stage
- stemse4
- Gene
- SSPse4
- Outcome
- interim storage functione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“stems also exhibited short-term production of SSPs, which hints at an interim storage function.”
e0“spring oilseed rape grown under optimal nitrogen supply or mild nitrogen deficiency revealed differences in senescence and nutrient mobilization in old lower canopy leaves and younger higher canopy leaves”
Claim · model-written summary
Nitrogen deficiency lowered peroxide content in oilseed rape.
- Taxon
- oilseed rapeBrassica napuse6
- Treatment
- nitrogen deficiente5
- Outcome
- hydrogen peroxide contentse5
- Direction
- lowere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In both cases, hydrogen peroxide contents were lower in nitrogen deficient plants, indicating that at least parts of the developmental senescence program appear to be suppressed under nitrogen deficiency.”
e6“complete nitrogen depletion in oilseed rape and Arabidopsis plants”
Claim · model-written summary
Nitrogen deficiency lowered peroxide content in Arabidopsis.
- Taxon
- Arabidopsis
Arabidopsise6 - Treatment
- nitrogen deficiente5
- Outcome
- hydrogen peroxide contentse5
- Direction
- lowere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In both cases, hydrogen peroxide contents were lower in nitrogen deficient plants, indicating that at least parts of the developmental senescence program appear to be suppressed under nitrogen deficiency.”
e6“complete nitrogen depletion in oilseed rape and Arabidopsis plants”
Claim · model-written summary
Lower peroxide suggests partial suppression of the developmental senescence program under nitrogen deficiency.
- Taxon
- oilseed rapeBrassica napuse6
- Compound
- hydrogen peroxidee5
- Outcome
- developmental senescence programe5
- Qualifier
- under nitrogen deficiencye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In both cases, hydrogen peroxide contents were lower in nitrogen deficient plants, indicating that at least parts of the developmental senescence program appear to be suppressed under nitrogen deficiency.”
e6“complete nitrogen depletion in oilseed rape and Arabidopsis plants”
The same questions in other papers
nitrogen · physiology: oxidative · ArabidopsisPositive and negative results
3 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- no effect
nitrogen · physiology: oxidative · Brassica napus (oilseed rape)Results agree
3 papers in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
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.