期刊
FUNGAL GENETICS AND BIOLOGY
卷 49, 期 6, 页码 470-482出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.fgb.2012.04.001
关键词
Effector; Fungal pathogenesis; Haustorium; Powdery mildew; Pyrosequencing; Transcript
资金
- Max-Planck society
- Deutsche Forschungsgemeinschaft (DFG)
- International Max-Planck Research School (IMPRS)
- Alexander-von-Humboldt foundation
Powdery mildews are phytopathogenic ascomycetes that have an obligate biotrophic lifestyle and establish intimate relationships with their plant hosts. A crucial aspect of this plant-fungus interaction is the formation of specialized fungal infection structures termed haustoria. Although located within the cell boundaries of plant epidermal cells, haustoria remain separated from the plant cytoplasm by a host plasma membrane derivative, the extrahaustorial membrane. Haustoria are thought to represent pivotal sites of nutrient uptake and effector protein delivery. We enriched haustorial complexes from Arabidopsis thaliana plants infected with the powdery mildew fungus Golovinomyces orontii and performed in-depth transcriptome analysis by 454-based pyrosequencing of haustorial cDNAs. We assembled 7077 expressed sequence tag (EST) contigs with greater than 5-fold average coverage and analyzed these with regard to the respective predicted protein functions. We found that transcripts coding for gene products with roles in protein turnover, detoxification of reactive oxygen species and fungal pathogenesis are abundant in the haustorial EST contigs, while surprisingly transcripts encoding presumptive nutrient transporters were not highly represented in the haustorial cDNA library. A substantial proportion (similar to 38%) of transcripts coding for predicted secreted proteins comprises effector candidates. Our data provide valuable insights into the transcriptome of the key infection structure of a model obligate biotrophic phytopathogen. (C) 2012 Elsevier Inc. All rights reserved.
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