High Level Activation of Vitamin B1 Biosynthesis Genes in Haustoria of the Rust Fungus Uromyces fabae

Sohn, Jürgen; Voegele, Ralf T.; Mendgen, Kurt; Hahn, Matthias

High Level Activation of Vitamin B1 Biosynthesis Genes in Haustoria of the Rust Fungus Uromyces fabae

Dateien

180_sohn00.pdfGröße: 398.81 KBDownloads: 346

Datum

2000

Autor:innen

Sohn, Jürgen

Voegele, Ralf T.

Mendgen, Kurt

Hahn, Matthias

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Molecular Plant-Microbe Interaction. 2000, 13(6), pp. 629-636. ISSN 0894-0282. Available under: doi: 10.1094/MPMI.2000.13.6.629

Zusammenfassung

In the rust fungus Uromyces fabae, the transition from the early stages of host plant invasion toward parasitic growth is accompanied by the activation of many genes (PIGs = in planta induced genes). Two of them, PIG1 (= THI1) and PIG4 (= THI2), were found to be highly transcribed in haustoria, and are homologous to genes involved in thiamine (vitamin B1) biosynthesis in yeast. Their functional identity was confirmed by complementation of Schizosaccharomyces pombe thiamine auxotrophic thi3 (nmt1) and thi2 (nmt2) mutants, respectively. In contrast to thiamine biosynthesis genes of other fungi that are completely suppressed by thiamine, THI1 and THI2 expression was not affected by the addition of thiamine to rust hyphae grown either in vitro or in planta. Immunoblot analysis revealed decreasing amounts of THI1p in extracts from spores, germlings, and in vitro-grown infection structures with increasing time after inoculation. Immunofluorescence microscopy of rust-infected leaves detected high concentrations of THI1p in haustoria, and only low amounts in intercellular hyphae. In the sporulating mycelium, THI1p was found in the basal hyphae of the uredia, but not in the pedicels and only at very low levels in uredospores. These data indicate that the haustorium is an essential structure of the biotrophic rust mycelium not only for nutrient uptake but also for the biosynthesis of metabolites such as thiamine.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

plant-pathogenic, Vicia faba.

Zitieren

ISO 690

SOHN, Jürgen, Ralf T. VOEGELE, Kurt MENDGEN, Matthias HAHN, 2000. High Level Activation of Vitamin B1 Biosynthesis Genes in Haustoria of the Rust Fungus Uromyces fabae. In: Molecular Plant-Microbe Interaction. 2000, 13(6), pp. 629-636. ISSN 0894-0282. Available under: doi: 10.1094/MPMI.2000.13.6.629

BibTex

@article{Sohn2000Level-7349,
  year={2000},
  doi={10.1094/MPMI.2000.13.6.629},
  title={High Level Activation of Vitamin B1 Biosynthesis Genes in Haustoria of the Rust Fungus Uromyces fabae},
  number={6},
  volume={13},
  issn={0894-0282},
  journal={Molecular Plant-Microbe Interaction},
  pages={629--636},
  author={Sohn, Jürgen and Voegele, Ralf T. and Mendgen, Kurt and Hahn, Matthias}
}

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    <dcterms:abstract xml:lang="eng">In the rust fungus Uromyces fabae, the transition from the early stages of host plant invasion toward parasitic growth is accompanied by the activation of many genes (PIGs = in planta induced genes). Two of them, PIG1 (= THI1) and PIG4 (= THI2), were found to be highly transcribed in haustoria, and are homologous to genes involved in thiamine (vitamin B1) biosynthesis in yeast. Their functional identity was confirmed by complementation of Schizosaccharomyces pombe thiamine auxotrophic thi3 (nmt1) and thi2 (nmt2) mutants, respectively. In contrast to thiamine biosynthesis genes of other fungi that are completely suppressed by thiamine, THI1 and THI2 expression was not affected by the addition of thiamine to rust hyphae grown either in vitro or in planta. Immunoblot analysis revealed decreasing amounts of THI1p in extracts from spores, germlings, and in vitro-grown infection structures with increasing time after inoculation. Immunofluorescence microscopy of rust-infected leaves detected high concentrations of THI1p in haustoria, and only low amounts in intercellular hyphae. In the sporulating mycelium, THI1p was found in the basal hyphae of the uredia, but not in the pedicels and only at very low levels in uredospores. These data indicate that the haustorium is an essential structure of the biotrophic rust mycelium not only for nutrient uptake but also for the biosynthesis of metabolites such as thiamine.</dcterms:abstract>
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