Wheat blast: histopathology and transcriptome reprogramming in response to adapted and nonadapted Magnaporthe isolates

Tufan Hale A., McGrann Graham R.D., Magusin Andreas, Morel Jean-Benoit, Miche Lucie, Boyd Lesley A.. 2009. Wheat blast: histopathology and transcriptome reprogramming in response to adapted and nonadapted Magnaporthe isolates. New Phytologist, 184 (7) : 473-484.

https://doi.org/10.1111/j.1469-8137.2009.02970.x

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Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : 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. o 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. o 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). o 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 broadspectrum resistance mechanisms in wheat towards Magnaporthe.

Mots-clés Agrovoc : Magnaporthe, Magnaporthe grisea, Triticum aestivum, Digitaria sanguinalis

Mots-clés complémentaires : Magnaporthe oryzae

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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