Foo, E, Auxin influences strigolactones in pea mycorrhizal symbiosis, Journal of Plant Physiology, 170 pp. 523- 528. ISSN 0176-1617 (2013) [Refereed Article]
Copyright 2012 Elsevier GmbH.
Hormone interactions are essential for the control of many developmental processes, including intracellular symbioses. The interaction between auxin and the new plant hormone strigolactone in the regulation of arbuscular mycorrhizal symbiosis was examined in one of the few auxin deficient mutants available in a mycorrhizal species, the auxin-deficient bsh mutant of pea (Pisum sativum). Mycorrhizal colonisation with the fungus Glomus intraradices was significantly reduced in the low auxin bsh mutant. The bsh mutant also exhibited a reduction in strigolactone exudation and the expression of a key strigolactone biosynthesis gene (PsCCD8). Strigolactone exudation was also reduced in wild type plants when the auxin content was reduced by stem girdling. Low strigolactone levels appear to be at least partially responsible for the reduced colonisation of the bsh mutant, as application of the synthetic strigolactone GR24 could partially rescue the mycorrhizal phenotype of bsh mutants. Data presented here indicates root auxin content was correlated with strigolactone exudation in both mutant and wild type plants. Mutant studies suggest that auxin may regulate early events in the formation of arbuscular mycorrhizal symbiosis by controlling strigolactone levels, both in the rhizosphere and possibly during early root colonisation.
|Item Type:||Refereed Article|
|Keywords:||mycorrhizal symbiosis, auxin, strigolactones|
|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 (Dr Eloise Foo)|
|Funding Support:||Australian Research Council (DP0772348)|
|Web of Science® Times Cited:||32|
|Deposited By:||Plant Science|
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