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Relationship between gibberellin, ethylene and nodulation in Pisum sativum

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Ferguson, BJ and Foo, E and Ross, JJ and Reid, JB (2011) Relationship between gibberellin, ethylene and nodulation in Pisum sativum. New Phytologist, 189 (3). pp. 829-842. ISSN 1469-8137

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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 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.

Item Type: Article
Keywords: gibberellin pea ethylene nodulation
Journal or Publication Title: New Phytologist
Page Range: pp. 829-842
ISSN: 1469-8137
Identification Number - DOI: doi: 10.1111/j.1469-8137.2010.03542.x
Additional Information: 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
URI: http://eprints.utas.edu.au/id/eprint/11049
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