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Ethylene signaling is important for isoflavonoid mediated resistance to Rhizoctonia solani in roots of Medicago truncatula

ABSTRACT: The root-infecting necrotrophic fungal pathogen Rhizoctonia solani causes significant disease to all the world’s major food crops. As a model for pathogenesis of legumes we have examined the interaction of R. solani AG8 with Medicago truncatula. RNAseq analysis of the moderately resistant M. truncatula accession A17 and highly susceptible sickle (skl) mutant (defective in ethylene sensing) identified major transcriptional reprogramming early in A17. Responses specific to A17 included components of ethylene signalling, numerous class IX ERF transcription factor family members, reactive oxygen species metabolism and consistent up-regulation of the isoflavonoid biosynthesis pathway. Mass-spectrometry revealed accumulation of the isoflavonoid related compounds liquiritigenin, formononetin, medicarpin and biochanin A in A17. Over-expression of an isoflavone synthase (IFS) in M. truncatula roots increased isoflavonoid accumulation and resistance to R. solani. Addition of exogenous medicarpin suggested this phytoalexin may be one of several isoflavonoids required to contribute to resistance to R. solani. Together these results provide evidence for the role of ethylene-mediated accumulation of isoflavonoids during defence against root pathogens in legumes.

ORGANISM(S): Medicago truncatula

PROVIDER: GSE94260 | GEO | 2017/06/06

SECONDARY ACCESSION(S): PRJNA369210

REPOSITORIES: GEO

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