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Strigolactones, a new hormone group with roles in plant-microbe interactions

Citation

Blake, SN and Barry, KM and Reid, JB and Foo, E, Strigolactones, a new hormone group with roles in plant-microbe interactions, Australasian Soilborne Disease Symposium 2014, 10-13 November 2014, Hobart, Australia, pp. 10. (2014) [Conference Extract]

Abstract

Plants use a range of signals to regulate their growth, development and response to the environment, foremost the small, potent plant hormones. The discovery of strigolactones (SLs) in 2008 as only the ninth plant hormone group has given rise to a new field of research examining the roles of SLs in plants. SLs are ancient signals present in algae to flowering plants and can act as both internal hormones and rhizosphere signals. SLs have roles throughout the plant, from shoot and root architecture to interactions with symbiotic microbes. Given the widespread nature of SLs across plant species and the current interest in manipulating crop SLs to manage plant architecture, symbiotic relationships and parasitic weed interactions it is essential that we gain an understanding of the role of SLs in plant-pathogen interactions. This work investigates these interactions using two model pathosystems between garden pea (Pisum sativum L.) and the soil-borne pathogens, Pythium irregularum and Fusarium oxysporum f.sp. pisi. We found no evidence that synthetic SLs could directly influence the growth of either pathogen in culture, indicating that unlike interactions with symbiotic arbuscular mycorrhizal fungi, SLs are not likely to act as rhizosphere signals in these plant-pathogen interactions. SL-deficient pea mutants challenged with Pythium irregulare and Fusarium oxysporum f.sp. pisi developed disease symptoms in a similar manner to wild type plants, indicating SLs are unlikely to play a significant role in response to these particular diseases in pea. In contrast, parallel studies with ethylene-insensitive pea mutants suggest a positive role for ethylene in response to P. irregulare.

Item Details

Item Type:Conference Extract
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Agricultural and Veterinary Sciences
Author:Blake, SN (Mrs Sara Blake)
Author:Barry, KM (Dr Karen Barry)
Author:Reid, JB (Professor Jim Reid)
Author:Foo, E (Dr Eloise Foo)
ID Code:98652
Year Published:2014
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-02-23
Last Modified:2015-02-23
Downloads:0

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