Abstract
Background and aims: Gibberellins (GAs) are a class of plant hormones with diverse functions. However, there has been little information on the role of GAs in response to plant nutrient deficiency. Methods: To evaluate the roles of GAs in regulation of Fe homeostasis, the effects of GA on Fe accumulation and Fe translocation in rice seedlings were investigated using wild-type, a rice mutant ( eui1 ) displaying enhnaced endogenous GA concentrations due to a defect in GA deactivation, and transgenic rice plants overexpressing OsEUI . Key Results: Exposure to Fe-deficient medium significantly reduced biomass of rice plants. Both exogenous application of GA and an endogenous increase of bioactive GA enhanced Fe-deficiency response by exaggerating foliar chlorosis and reducing growth. Iron deficiency significantly suppressed production of GA 1 and GA 4 , the biologically active GAs in rice. Exogenous application of GA significantly decreased leaf Fe concentration regardless of Fe supply. Iron concentration in shoot of eui1 mutants was lower than that of WT plants under both Fe-sufficient and Fe-deficient conditions. Paclobutrazol, an inhibitor of GA biosynthesis, alleviated Fe-deficiency responses, and overexpression of EUI significantly increased Fe concentration in shoots and roots. Furthermore, both exogenous application of GA and endogenous increase in GA resulting from EUI mutation inhibited Fe translocation within shoots by suppressing OsYSL2 expression, which is involved in Fe transport and translocation. Conclusions: The novel findings provide compelling evidence to support the involvement of GA in mediation of Fe homeostasis in strategy II rice plants by negatively regulating Fe transport and translocation.
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Claims 10
Claim · model-written summary
Iron deficiency reduced rice biomass.
- Taxon
- rice plants
Oryza sativae0 - Treatment
- Fe-deficient mediume0
- Outcome
- biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to Fe-deficient medium significantly reduced biomass of rice plants.”
Claim · model-written summary
Exogenous GA enhanced chlorosis and reduced growth under iron deficiency.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- exogenous application of GAe0
- Outcome
- foliar chlorosis and reducing growthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both exogenous application of GA and an endogenous increase of bioactive GA enhanced Fe-deficiency response by exaggerating foliar chlorosis and reducing growth.”
t0“rice seedlings (Oryza sativa)”
Claim · model-written summary
Endogenous bioactive GA increase enhanced chlorosis and reduced growth.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- an endogenous increase of bioactive GAe0
- Outcome
- foliar chlorosis and reducing growthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both exogenous application of GA and an endogenous increase of bioactive GA enhanced Fe-deficiency response by exaggerating foliar chlorosis and reducing growth.”
t0“rice seedlings (Oryza sativa)”
Claim · model-written summary
Iron deficiency suppressed GA 1 and GA 4 production.
- Taxon
- riceOryza sativae0
- Treatment
- Iron deficiencye0
- Outcome
- production of GA 1 and GA 4e0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron deficiency significantly suppressed production of GA 1 and GA 4 , the biologically active GAs in rice.”
Claim · model-written summary
Exogenous GA decreased leaf iron concentration regardless of iron supply.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- Exogenous application of GAe0
- Outcome
- leaf Fe concentratione0
- Direction
- decreasede0
- Qualifier
- regardless of Fe supplye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous application of GA significantly decreased leaf Fe concentration regardless of Fe supply.”
t0“rice seedlings (Oryza sativa)”
Claim · model-written summary
eui1 shoots had less iron than wild type under both iron conditions.
- Taxon
- rice seedlingsOryza sativat0
- Material
- eui1 mutantse0
- Outcome
- Iron concentration in shoote0
- Direction
- lowere0
- Qualifier
- under both Fe-sufficient and Fe-deficient conditionse0
- Comparator
- WT plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron concentration in shoot of eui1 mutants was lower than that of WT plants under both Fe-sufficient and Fe-deficient conditions.”
t0“rice seedlings (Oryza sativa)”
Claim · model-written summary
Paclobutrazol alleviated iron deficiency responses.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- Paclobutrazole0
- Outcome
- Fe-deficiency responsese0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paclobutrazol, an inhibitor of GA biosynthesis, alleviated Fe-deficiency responses,”
t0“rice seedlings (Oryza sativa)”
Claim · model-written summary
EUI overexpression increased shoot and root iron concentration.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- overexpression of EUIe0
- Gene
- EUIe0
- Outcome
- Fe concentration in shoots and rootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overexpression of EUI significantly increased Fe concentration in shoots and roots.”
t0“rice seedlings (Oryza sativa)”
Claim · model-written summary
Exogenous GA inhibited shoot iron translocation through suppressed OsYSL2 expression.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- exogenous application of GAe0
- Gene
- OsYSL2e0
- Outcome
- Fe translocation within shootse0
- Direction
- inhibitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both exogenous application of GA and endogenous increase in GA resulting from EUI mutation inhibited Fe translocation within shoots by suppressing OsYSL2 expression”
t0“rice seedlings (Oryza sativa)”
Claim · model-written summary
Endogenous GA increase from EUI mutation inhibited shoot iron translocation through suppressed OsYSL2 expression.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- endogenous increase in GA resulting from EUI mutatione0
- Gene
- OsYSL2e0
- Outcome
- Fe translocation within shootse0
- Direction
- inhibitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both exogenous application of GA and endogenous increase in GA resulting from EUI mutation inhibited Fe translocation within shoots by suppressing OsYSL2 expression”
t0“rice seedlings (Oryza sativa)”
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See all 165 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.