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Characterization of border species among Pythiaceae: several Pythium isolates produce elicitins, typical proteins from Phytophthora spp.

Published online by Cambridge University Press:  01 December 1997

FRANCK PANABIÈRES
Affiliation:
Institut National de la Recherche Agronomique, station de Botanique et de Pathologie Végétale, BP 2078, F-06606 Antibes Cedex, France
MICHEL PONCHET
Affiliation:
Institut National de la Recherche Agronomique, station de Botanique et de Pathologie Végétale, BP 2078, F-06606 Antibes Cedex, France
VALÉRIE ALLASIA
Affiliation:
Institut National de la Recherche Agronomique, station de Botanique et de Pathologie Végétale, BP 2078, F-06606 Antibes Cedex, France
LOÏC CARDIN
Affiliation:
Institut National de la Recherche Agronomique, station de Botanique et de Pathologie Végétale, BP 2078, F-06606 Antibes Cedex, France
PIERRE RICCI
Affiliation:
Institut National de la Recherche Agronomique, station de Botanique et de Pathologie Végétale, BP 2078, F-06606 Antibes Cedex, France
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Abstract

Elicitins, holoproteins which act as inducers of hypersensitivity on tobacco, were considered as a characteristic of Phytophthora. They are also produced, along with glycosylated isoforms, by three species belonging to the related genus Pythium, Py. vexans, Py. oedochilum and Py. marsipium, while other Pythium species do not possess such proteins. Various elicitin-like sequences were determined, bringing novel features to the elicitin family, such as an histidine residue and C-terminal extensions on the deduced peptide sequences. As the unique elicitin content of these species supports a distinct location among Pythiaceae, we suggest the separation of vexans, Py. oedochilum and Py. marsipium from Pythium and consider them as linking species between Phytophthora and Pythium.

Type
Research Article
Copyright
The British Mycological Society 1997

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