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Gibberellins promote nodule organogenesis but inhibit the infection stages of nodulation


McAdam, EL and Reid, JB and Foo, E, Gibberellins promote nodule organogenesis but inhibit the infection stages of nodulation, Journal of Experimental Botany, 69, (8) pp. 2117-2130. ISSN 0022-0957 (2018) [Refereed Article]


Copyright Statement

Copyright 2018 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1093/jxb/ery046


Leguminous plant roots can form a symbiosis with soil-dwelling nitrogen-fixing rhizobia, leading to the formation of a new root organ, the nodule. Successful nodulation requires co-ordination of spatially separated events in the root, including infection in the root epidermis and nodule organogenesis deep in the root cortex. We show that the hormone gibberellin plays distinct roles in these epidermal and cortical programmes. We employed a unique set of genetic material in pea that includes severely gibberellin-deficient lines and della-deficient lines that enabled us to characterize all stages of infection and nodule development. We confirmed that gibberellin suppresses infection thread formation and show that it also promotes nodule organogenesis into nitrogen-fixing organs. In both cases, this is achieved through the action of DELLA proteins. This study therefore provides a mechanism to explain how both low and high gibberellin signalling can result in reduced nodule number and reveals a clear role for gibberellin in the maturation of nodules into nitrogen-fixing organs. We also demonstrate that gibberellin acts independently of ethylene in promoting nodule development.

Item Details

Item Type:Refereed Article
Keywords:nodulation, gibberellin, plant hormones, DELLA proteins, ethylene, infection thread, nitrogen fixation, nodulation, nodule organogenesis, pea
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Environmentally sustainable plant production
Objective Field:Environmentally sustainable plant production not elsewhere classified
UTAS Author:McAdam, EL (Dr Erin McAdam)
UTAS Author:Reid, JB (Professor Jim Reid)
UTAS Author:Foo, E (Associate Professor Eloise Foo)
ID Code:128174
Year Published:2018
Funding Support:Australian Research Council (FT140100770)
Web of Science® Times Cited:36
Deposited By:Plant Science
Deposited On:2018-09-06
Last Modified:2019-03-27
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