The role of strigolactones during plant interactions with the pathogenic fungus Fusarium oxysporum

Strigolactones (SLs) play important roles both inside the plant as a hormone and outside the plant as a rhizosphere signal in interactions with mycorrhizal fungi and parasitic weeds. What is less well understood is any potential role SLs may play in interactions with disease causing microbes such as...

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Bibliographic Details
Published in:Planta 2016-06, Vol.243 (6), p.1387-1396
Main Authors: Foo, Eloise, Blake, Sara N., Fisher, Brendan J., Smith, Jason A., Reid, James B.
Format: Article
Language:English
Subjects:
Biosynthetic Pathways - genetics
Disease Susceptibility
Ethylenes - metabolism
Ethylenes - pharmacology
Fusarium - drug effects
Fusarium - metabolism
Fusarium - physiology
Fusarium oxysporum
Germination - drug effects
Lactones - metabolism
Lactones - pharmacology
Mutation
ORIGINAL ARTICLE
Pathogens
Pisum sativum - genetics
Pisum sativum - metabolism
Pisum sativum - microbiology
Plant Growth Regulators - genetics
Plant Growth Regulators - metabolism
Plant Growth Regulators - pharmacology
Plant Roots - metabolism
Plant Roots - microbiology
Rhizosphere
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Summary:Strigolactones (SLs) play important roles both inside the plant as a hormone and outside the plant as a rhizosphere signal in interactions with mycorrhizal fungi and parasitic weeds. What is less well understood is any potential role SLs may play in interactions with disease causing microbes such as pathogenic fungi. In this paper we investigate the influence of SLs on the hemibiotrophic pathogen Fusarium oxysporum f.sp. pisi both directly via their effects on fungal growth and inside the plant through the use of a mutant deficient in SL. Given that various stereoisomers of synthetic and naturally occuring SLs can display different biological activities, we used (+)-GR24, (–)-GR24 and the naturally occurring SL, (+)-strigol, as well as a racemic mixture of 5-deoxystrigol. As a positive control, we examined the influence of a plant mutant with altered ethylene signalling, ein2, on disease development. We found no evidence that SLs influence spore germination or hyphal growth of Fusarium oxysporum and that, while ethylene signalling influences pea susceptibility to this pathogen, SLs do not.
ISSN:0032-0935
1432-2048
DOI:10.1007/s00425-015-2449-3