Abstract
• Retranslocation of iron (Fe) from source leaves to sinks requires soluble Fe binding forms. As much of the Fe is protein-bound and associated with the leaf nitrogen (N) status, we investigated the role of N in Fe mobilization and retranslocation under N deficiency- vs dark-induced leaf senescence. • By excluding Fe retranslocation from the apoplastic root pool, Fe concentrations in source and sink leaves from hydroponically grown barley (Hordeum vulgare) plants were determined in parallel with the concentrations of potential Fe chelators and the expression of genes involved in phytosiderophore biosynthesis. • N supply showed opposing effects on Fe pools in source leaves, inhibiting Fe export out of source leaves under N sufficiency but stimulating Fe export from source leaves under N deficiency, which partially alleviated Fe deficiency-induced chlorosis. Both triggers of leaf senescence, shading and N deficiency, enhanced NICOTIANAMINE SYNTHASE2 gene expression, soluble Fe pools in source leaves, and phytosiderophore and citrate rather than nicotianamine concentrations. • These results indicate that Fe mobilization within senescing leaves is independent of a concomitant N sink in young leaves and that phytosiderophores enhance Fe solubility in senescing source leaves, favoring subsequent Fe retranslocation.
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Claims 7
Claim · model-written summary
Nitrogen sufficiency inhibits iron export out of barley source leaves.
- Taxon
- barley (Hordeum vulgare)
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- N sufficiencye1
- Outcome
- Fe export out of source leavese1
- Direction
- inhibitinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“barley (Hordeum vulgare)”
e1“N supply showed opposing effects on Fe pools in source leaves, inhibiting Fe export out of source leaves under N sufficiency but stimulating Fe export from source leaves under N deficiency”
Claim · model-written summary
Nitrogen deficiency stimulates iron export from barley source leaves.
- Taxon
- barley (Hordeum vulgare)Hordeum vulgaret0
- Treatment
- N deficiencye1
- Outcome
- Fe export from source leavese1
- Direction
- stimulatinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare)”
e1“N supply showed opposing effects on Fe pools in source leaves, inhibiting Fe export out of source leaves under N sufficiency but stimulating Fe export from source leaves under N deficiency”
Claim · model-written summary
Nitrogen deficiency partially alleviates Fe deficiency-induced chlorosis in barley.
- Taxon
- barley (Hordeum vulgare)Hordeum vulgaret0
- Treatment
- N deficiencye1
- Outcome
- Fe deficiency-induced chlorosise2
- Direction
- partially alleviatede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare)”
e1“stimulating Fe export from source leaves under N deficiency”
e2“which partially alleviated Fe deficiency-induced chlorosis”
Claim · model-written summary
Shading and nitrogen deficiency enhance NICOTIANAMINE SYNTHASE2 gene expression and soluble Fe pools in barley source leaves.
- Taxon
- barley (Hordeum vulgare)Hordeum vulgaret0
- Treatment
- shading and N deficiencye3
- Gene
- NICOTIANAMINE SYNTHASE2e3
- Outcome
- NICOTIANAMINE SYNTHASE2 gene expression, soluble Fe pools in source leavese3
- Direction
- enhancede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare)”
e3“Both triggers of leaf senescence, shading and N deficiency, enhanced NICOTIANAMINE SYNTHASE2 gene expression, soluble Fe pools in source leaves”
Claim · model-written summary
Shading and nitrogen deficiency enhance phytosiderophore and citrate concentrations in barley source leaves rather than nicotianamine concentrations.
- Taxon
- barley (Hordeum vulgare)Hordeum vulgaret0
- Treatment
- shading and N deficiencye3
- Outcome
- phytosiderophore and citratee4
- Direction
- enhancede3
- Comparator
- nicotianamine concentrationse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare)”
e3“Both triggers of leaf senescence, shading and N deficiency, enhanced NICOTIANAMINE SYNTHASE2 gene expression, soluble Fe pools in source leaves”
e4“phytosiderophore and citrate rather than nicotianamine concentrations”
Claim · model-written summary
Iron mobilisation within senescing barley leaves is independent of a concomitant nitrogen sink in young leaves.
- Taxon
- barley (Hordeum vulgare)Hordeum vulgaret0
- Organ / stage
- senescing leavese5
- Outcome
- Fe mobilization within senescing leavese5
- Qualifier
- independent of a concomitant N sink in young leavese5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare)”
e5“These results indicate that Fe mobilization within senescing leaves is independent of a concomitant N sink in young leaves”
Claim · model-written summary
Phytosiderophores enhance iron solubility in senescing barley source leaves, favouring subsequent iron retranslocation.
- Taxon
- barley (Hordeum vulgare)Hordeum vulgaret0
- Organ / stage
- senescing source leavese6
- Compound
- phytosiderophorese6
- Outcome
- Fe solubilitye6
- Qualifier
- favoring subsequent Fe retranslocatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley (Hordeum vulgare)”
e6“phytosiderophores enhance Fe solubility in senescing source leaves, favoring subsequent Fe retranslocation”
The same questions in other papers
nitrogen · physiology: pigments · Hordeum vulgare (barley)Positive and negative results
5 papers in the same direction as this paper · 12 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
14 papers more in this group
See all 18 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.