Serveur d'exploration Melampsora (ISTEX)

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Nonhost Resistance of Rice to Rust Pathogens

Identifieur interne : 000D12 ( Main/Exploration ); précédent : 000D11; suivant : 000D13

Nonhost Resistance of Rice to Rust Pathogens

Auteurs : Michael Ayliffe [Australie] ; Rosangela Devilla [Australie] ; Rohit Mago [Australie] ; Rosemary White [Australie] ; Mark Talbot [Australie] ; Anthony Pryor [Australie] ; Hei Leung [Philippines]

Source :

RBID : Pascal:11-0421589

Descripteurs français

English descriptors

Abstract

Rice is atypical in that it is an agricultural cereal that is immune to fungal rust diseases. This report demonstrates that several cereal rust species (Puccinia graminis f. sp tritici, P. triticina, P. striiformis, and P. hordei) can infect rice and produce all the infection structures necessary for plant colonization, including specialized feeding cells (haustoria). Some rust infection sites are remarkably large and many plant cells are colonized, suggesting that nutrient uptake occurs to support this growth. Rice responds with an active, nonhost resistance (NHR) response that prevents fungal sporulation and that involves callose deposition, production of reactive oxygen species, and, occasionally, cell death. Genetic variation for the efficacy of NHR to wheat stem rust and wheat leaf rust was observed. Unlike cereal rusts, the rust pathogen (Melampsora lini) of the dicotyledenous plant flax (Linum usitatissimum) rarely successfully infects rice due to an apparent inability to recognize host-derived signals. Morphologically abnormal infection structures are produced and appressorial-like structures often don't coincide with stomata. These data suggest that basic compatibility is an important determinate of nonhost infection outcomes of rust diseases on cereals, with cereal rusts being more capable of infecting a cereal nonhost species compared with rust species that are adapted for dicot hosts.


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<term>Base Sequence (MeSH)</term>
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<term>Crosses, Genetic (MeSH)</term>
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<term>Hydrogen Peroxide (metabolism)</term>
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<term>Oryza (physiology)</term>
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<term>Basidiomycota (classification)</term>
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<term>Croisements génétiques (MeSH)</term>
<term>Gènes de plante (MeSH)</term>
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<term>Interactions hôte-pathogène (physiologie)</term>
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<term>Oryza (physiologie)</term>
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<front>
<div type="abstract" xml:lang="en">Rice is atypical in that it is an agricultural cereal that is immune to fungal rust diseases. This report demonstrates that several cereal rust species (Puccinia graminis f. sp tritici, P. triticina, P. striiformis, and P. hordei) can infect rice and produce all the infection structures necessary for plant colonization, including specialized feeding cells (haustoria). Some rust infection sites are remarkably large and many plant cells are colonized, suggesting that nutrient uptake occurs to support this growth. Rice responds with an active, nonhost resistance (NHR) response that prevents fungal sporulation and that involves callose deposition, production of reactive oxygen species, and, occasionally, cell death. Genetic variation for the efficacy of NHR to wheat stem rust and wheat leaf rust was observed. Unlike cereal rusts, the rust pathogen (Melampsora lini) of the dicotyledenous plant flax (Linum usitatissimum) rarely successfully infects rice due to an apparent inability to recognize host-derived signals. Morphologically abnormal infection structures are produced and appressorial-like structures often don't coincide with stomata. These data suggest that basic compatibility is an important determinate of nonhost infection outcomes of rust diseases on cereals, with cereal rusts being more capable of infecting a cereal nonhost species compared with rust species that are adapted for dicot hosts.</div>
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