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The role of strigolactones in plant disease


Foo, E and Blake, S and Barry, K and Reid, JB, The role of strigolactones in plant disease, Abstracts of the 1st International Congress on Strigolactones, 1-6 March, Wageningen, The Netherlands, pp. 38. (2014) [Conference Extract]

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Strigolactones (Sls) have important roles in interactions with beneficial microbes, including as a rhizoshphere signal in arbuscular mycorrhizal (AM) fungal associations and in the roots of legumes during nodulation. However, the potential role of SLs in interactions with pathogenic microbes has only recently begun to be explored, with limited evidence for a positive role in disease protection against foliar fungal pathogens in tomato. Given the production of Sls by roots, with roles both inside and outside the plant we explored the role of Sls in development of root diseases using garden pea (Pisum sativum L.) as a model system. We examined interactions with a soil-borne pathogen, the oomycete Pythium irregulare that causes necrotrophic root rot. In vitro studies provided no evidence that synthetic SL could directly influence the growth of this pathogen in culture, indicating that Sls are not likely to act as rhizosphere signals in this plant-pathogen interactions. When grown with Pythium irregularum, pea mutants defective in key steps of SL biosynthesis, Psccd7 and Psccd8, and SL-insensitive mutant Psf-box, developed disease symptoms in a similar manner to wild type plants, indicating Sls are unlikely to play a significant role in response to this disease in pea. Consistent with this, we found SL production was not significantly altered in Pythium irregulare infected wild type plants. In contrast, parallel studies with an ethyleneinsensitive pea mutant, Psein2, suggest a positive role for ethylene in response to P. irregulare. This work is currently being expanded to look at other root pathogens including the true fungi Fusarium oxysporum f. sp. pisi that grows as a hemibiotroph and leads to vascular wilt of pea.

Item Details

Item Type:Conference Extract
Keywords:strigolactone, disease, pea, Pythium, ethylene
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:Blake, S (Mrs Sara Blake)
UTAS Author:Barry, K (Associate Professor Kara Barry)
UTAS Author:Reid, JB (Professor Jim Reid)
ID Code:99251
Year Published:2014
Deposited By:Plant Science
Deposited On:2015-03-18
Last Modified:2015-03-18
Downloads:3 View Download Statistics

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