Detection of race-specific resistance against Puccinia coronata f. sp. avenae in Brachypodium species

Vahid Omidvar, Sheshanka Dugyala, Feng Li, Susan Rottschaefer, Marisa Miller, Michael Ayliffe, Matthew James Moscou, Shahryar F Kianian, Melania Figueroa

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6 Citations (Scopus)


Oat crown rust caused by Puccinia coronata f. sp. avenae is the most destructive foliar disease of cultivated oat. Characterization of genetic factors controlling resistance responses to Puccinia coronata f. sp. avenae in non-host species could provide new resources for developing disease protection strategies in oat. We examined symptom development and fungal colonization levels of a collection of Brachypodium distachyon and B. hybridum accessions infected with three North American P. coronata f. sp. avenae isolates. Our results demonstrated that colonization phenotypes are dependent on both host and pathogen genotypes, indicating a role for race-specific responses in these interactions. These responses were independent of the accumulation of reactive oxygen species. Expression analysis of several defense-related genes suggested that salicylic acid and ethylene-mediated signaling, but not jasmonic acid are components of resistance reaction to P. coronata f. sp. avenae. Our findings provide the basis to conduct a genetic inheritance study to examine if effector-triggered immunity contributes to non-host resistance to P. coronata f. sp. avenae in Brachypodium species.
Original languageEnglish
Pages (from-to)1443-1454
Issue number12
Early online dateAug 2018
Publication statusPublished - Dec 2018

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