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Pythium attrantheridium sp. nov.: taxonomy and comparison with related species

Published online by Cambridge University Press:  05 August 2004

Nadine ALLAIN-BOULÉ ,
Russell TWEDDELL ,
Marc MAZZOLA ,
Richard BÉLANGER  and
C. André LÉVESQUE
Nadine ALLAIN-BOULÉ
Affiliation:
Centre de Recherche en Horticulture, Université Laval, Ste-Foy, QC G1K 7P4, Canada.
Russell TWEDDELL
Affiliation:
Centre de Recherche en Horticulture, Université Laval, Ste-Foy, QC G1K 7P4, Canada.
Marc MAZZOLA
Affiliation:
USDA-ARS, Tree Fruit Research Laboratory, Wenatchee, WA 98801, USA.
Richard BÉLANGER
Affiliation:
Centre de Recherche en Horticulture, Université Laval, Ste-Foy, QC G1K 7P4, Canada.
C. André LÉVESQUE
Affiliation:
Eastern Cereal and Oilseed Research Center, Agriculture & Agri-Food Canada, 960 Carling Avenue, Ottawa, ON K1A 0C6, Canada. E-mail: [email protected]
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Abstract

Pythium attrantheridium sp. nov. is a new species isolated from cavity spot lesions of carrots as well as apple and cherry seedlings from various locations widely distributed in Canada and the USA. This fungus is closely related to the heterothallic P. intermedium, but is distinguished by: (1) unique molecular characteristics; (2) unique morphological characteristics; and (3) mating incompatibility with P. intermedium. The ITS region of the nuclear rDNA of all strains of P. attrantheridium studied is different from that of all other known Pythium spp. The oogonia attract a large number of antheridia when compatible mating types contact each other. The positive mating type produces zoospores unlike those of P. intermedium. Thus, biological, morphological and molecular data support the recognition of a new species.

Type
Research Article
Information
Mycological Research , Volume 108 , Issue 7 , July 2004 , pp. 795 - 805
Copyright
© The British Mycological Society 2004

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