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Interactions between ethylene, gibberellins, and brassinosteroids in the development of rhizobial and mycorrhizal symbioses of pea


Foo, E and McAdam, EL and Weller, JL and Reid, JB, Interactions between ethylene, gibberellins, and brassinosteroids in the development of rhizobial and mycorrhizal symbioses of pea, Journal of Experimental Botany, 67, (8) pp. 2413-2424. ISSN 0022-0957 (2016) [Refereed Article]


Copyright Statement

Copyright 2016 The Author. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0)

DOI: doi:10.1093/jxb/erw047


The regulation of arbuscular mycorrhizal development and nodulation involves complex interactions between the plant and its microbial symbionts. In this study, we use the recently identified ethylene-insensitive ein2 mutant in pea (Pisum sativum L.) to explore the role of ethylene in the development of these symbioses. We show that ethylene acts as a strong negative regulator of nodulation, confirming reports in other legumes. Minor changes in gibberellin1 and indole-3-acetic acid levels in ein2 roots appear insufficient to explain the differences in nodulation. Double mutants produced by crosses between ein2 and the severely gibberellin-deficient na and brassinosteroid-deficient lk mutants showed increased nodule numbers and reduced nodule spacing compared with the na and lk single mutants, but nodule numbers and spacing were typical of ein2 plants, suggesting that the reduced number of nodules in na and lk plants is largely due to the elevated ethylene levels previously reported in these mutants. We show that ethylene can also negatively regulate mycorrhizae development when ethylene levels are elevated above basal levels, consistent with a role for ethylene in reducing symbiotic development under stressful conditions. In contrast to the hormone interactions in nodulation, ein2 does not override the effect of lk or na on the development of arbuscular mycorrhizae, suggesting that brassinosteroids and gibberellins influence this process largely independently of ethylene.

Item Details

Item Type:Refereed Article
Keywords:arbuscular mycorrhizae, brassinosteroids, ein2, ethylene insensitivity, gibberellins, hormone mutants, nodulation, peas, root growth
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:Foo, E (Associate Professor Eloise Foo)
UTAS Author:McAdam, EL (Dr Erin McAdam)
UTAS Author:Weller, JL (Associate Professor Jim Weller)
UTAS Author:Reid, JB (Professor Jim Reid)
ID Code:106633
Year Published:2016
Funding Support:Australian Research Council (FT140100770)
Web of Science® Times Cited:35
Deposited By:Plant Science
Deposited On:2016-02-16
Last Modified:2017-11-02
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