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Wheat blast: histopathology and transcriptome reprogramming in response to adapted and nonadapted Magnaporthe isolates
Author(s) -
Tufan Hale A.,
McGrann Graham R. D.,
Magusin Andreas,
Morel JeanBenoit,
Miché Lucie,
Boyd Lesley A.
Publication year - 2009
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2009.02970.x
Subject(s) - biology , magnaporthe grisea , transcriptome , magnaporthe , reprogramming , gene , plant disease resistance , microbiology and biotechnology , gene expression , genetics , botany , oryza sativa
Summary• Blast disease (causal agent Magnaporthe oryzae ) has presented as a new and serious field disease of wheat in South America. Here, we investigated the responses of wheat to both adapted and nonadapted isolates of the blast fungus Magnaporthe , examining cellular defence and transcriptional changes. • Resistance towards the nonadapted isolate was associated with the formation of appositions, here termed halos, beneath attempted Magnaporthe grisea penetration sites that wheat‐adapted, M. oryzae isolates were able to breach. • Transcriptome analysis indicated extensive transcriptional reprogramming following inoculation with both wheat‐adapted and nonadapted isolates of Magnaporthe . Functional annotation of many of the differentially expressed transcripts classified into the categories: cell rescue and defence, plant metabolism, cellular transport and regulation of transcription (although a significant number of transcripts remain unclassified). • Defence‐related transcripts induced in common by adapted and nonadapted isolates were differentially regulated in response to M. oryzae and M. grisea isolates over time. Differential expression of genes involved in cellular transport indicated the importance of this process in plant defence. Functional characterisation of these transcripts and their role in defence may eventually lead to the identification of broad‐spectrum resistance mechanisms in wheat towards Magnaporthe .