Authors: Eloise Foo Sara N Blake Brendan J Fisher Jason A Smith James B Reid
Publish Date: 2016/01/02
Volume: 243, Issue: 6, Pages: 1387-1396
Abstract
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 fsp 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 5deoxystrigol 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 notWe wish to thank Dr Erin McAdam Dr Alison Dann Shelley Urquhart Claire Frappell Nikita Lovel Tracey Winterbottom and Michelle Lang for technical assistance We thank Dr Jim Weller UTAS for ein2 seed Dr Karen Barry TIA Tasmania for useful discussions Dr Chris McErlean University of Sydney for the kind gift of +GR24 and −GR24 and Steven Abel for the synthesis of the rac5deoxystrigol
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