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Relationship between gibberellin, ethylene and nodulation in Pisum sativum
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• 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 wildtype
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.
|Keywords:||gibberellin pea ethylene nodulation|
|Journal or Publication Title:||New Phytologist|
|Page Range:||pp. 829-842|
|Identification Number - DOI:||10.1111/j.1469-8137.2010.03542.x|
The definitive published version is available online at: http://onlinelibrary.wiley.com
|Date Deposited:||16 Jun 2011 01:12|
|Last Modified:||18 Nov 2014 04:18|
|Item Statistics:||View statistics for this item|
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