Abstract
• Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation. Nodules that do form are aberrant, having poorly developed meristems and a lack of enlarged cells. Studies using additional GA-biosynthesis double mutants indicate that this results from severe GA deficiency of the roots rather than simply dwarf shoot stature. • Double mutants isolated from crosses between na and three supernodulating pea mutants exhibit a supernodulation phenotype, but the nodule structures are aberrant. This suggests that severely reduced GA concentrations are not entirely inhibitory to nodule initiation, but that higher GA concentrations are required for proper nodule development. • na mutants evolve more than double the amount of ethylene produced by wild-type plants, indicating that low GA concentrations can promote ethylene production. The excess ethylene may contribute to the reduced nodulation of na plants, as application of an ethylene biosynthesis inhibitor increased na nodule numbers. However, these nodules were still aberrant in structure. • Constitutive GA signalling mutants also form significantly fewer nodules than wild-type plants. This suggests that there is an optimum degree of GA signalling required for nodule formation and that the GA signal, and not the concentration of bioactive GA per se, is important for nodulation.
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Claims 12
Claim · model-written summary
Gibberellin deficiency from the na mutation reduces nodulation in pea.
- Taxon
- Pisum sativum
Lathyrus oleraceuse0 - Material
- na mutatione0
- Treatment
- Gibberellin (GA) deficiencye0
- Outcome
- nodulatione0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
Claim · model-written summary
Nodules that form in pea are aberrant, with poorly developed meristems and a lack of enlarged cells.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Outcome
- Nodules that do form are aberrante1
- Qualifier
- poorly developed meristems and a lack of enlarged cellse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“Nodules that do form are aberrant, having poorly developed meristems and a lack of enlarged cells”
Claim · model-written summary
Reduced nodulation in na pea results from severe GA deficiency of the roots rather than dwarf shoot stature.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Compound
- GAe1
- Outcome
- nodulatione0
- Qualifier
- severe GA deficiency of the roots rather than simply dwarf shoot staturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“Studies using additional GA-biosynthesis double mutants indicate that this results from severe GA deficiency of the roots rather than simply dwarf shoot stature”
Claim · model-written summary
Double mutants from crosses of na with three supernodulating pea mutants show a supernodulation phenotype with aberrant nodule structures.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Material
- Double mutants isolated from crosses between na and three supernodulating pea mutantse1
- Outcome
- supernodulation phenotypee1
- Qualifier
- the nodule structures are aberrante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“Double mutants isolated from crosses between na and three supernodulating pea mutants exhibit a supernodulation phenotype, but the nodule structures are aberrant”
Claim · model-written summary
Severely reduced GA concentrations are not entirely inhibitory to nodule initiation, while higher GA concentrations are required for proper nodule development.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Compound
- GAe1
- Outcome
- nodule initiatione1
- Qualifier
- not entirely inhibitorye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“This suggests that severely reduced GA concentrations are not entirely inhibitory to nodule initiation, but that higher GA concentrations are required for proper nodule development”
Claim · model-written summary
na mutants produce more than double the amount of ethylene of wild-type plants.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Material
- na mutantse1
- Compound
- ethylenee1
- Outcome
- amount of ethylene producede1
- Direction
- more than doublee1
- Comparator
- wild-type plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“na mutants evolve more than double the amount of ethylene produced by wild-type plants, indicating that low GA concentrations can promote ethylene production”
Claim · model-written summary
Low GA concentrations promote ethylene production in pea.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- low GA concentrationse1
- Compound
- ethylenee1
- Outcome
- ethylene productione1
- Direction
- promotee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“na mutants evolve more than double the amount of ethylene produced by wild-type plants, indicating that low GA concentrations can promote ethylene production”
Claim · model-written summary
Excess ethylene may contribute to the reduced nodulation of na pea plants.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Compound
- ethylenee1
- Outcome
- reduced nodulatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“The excess ethylene may contribute to the reduced nodulation of na plants, as application of an ethylene biosynthesis inhibitor increased na nodule numbers”
Claim · model-written summary
Application of an ethylene biosynthesis inhibitor increased na nodule numbers.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Material
- na plantse1
- Treatment
- application of an ethylene biosynthesis inhibitore1
- Outcome
- na nodule numberse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“The excess ethylene may contribute to the reduced nodulation of na plants, as application of an ethylene biosynthesis inhibitor increased na nodule numbers”
Claim · model-written summary
Nodules remained aberrant in structure after the ethylene biosynthesis inhibitor treatment.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Outcome
- these nodulese1
- Qualifier
- still aberrant in structuree1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“However, these nodules were still aberrant in structure”
Claim · model-written summary
Constitutive GA signalling mutants form significantly fewer nodules than wild-type pea plants.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Material
- Constitutive GA signalling mutantse1
- Outcome
- nodulese1
- Direction
- fewere1
- Comparator
- wild-type plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“Constitutive GA signalling mutants also form significantly fewer nodules than wild-type plants”
Claim · model-written summary
An optimum degree of GA signalling is required for nodule formation, and the GA signal rather than bioactive GA concentration matters for nodulation.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Compound
- GAe1
- Outcome
- nodule formatione1
- Qualifier
- optimum degree of GA signallinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin (GA) deficiency resulting from the na mutation in pea (Pisum sativum) causes a reduction in nodulation”
e1“This suggests that there is an optimum degree of GA signalling required for nodule formation and that the GA signal, and not the concentration of bioactive GA per se, is important for nodulation”
The same questions in other papers
ethene · symbiosis · Lathyrus oleraceus (pea)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
1 paper more in this group
See all 5 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.