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Heavily-melanized variants of the sexual Gaeumannomyces graminis var. tritici are non-pathogenic and indistinguishable from the asexual, Phialophora state

Published online by Cambridge University Press:  03 December 2002

Tresa Q. GOINS ,
William A. EDENS  and
Joan M. HENSON
Tresa Q. GOINS
Affiliation:
Department of Microbiology, Montana State University, Bozeman, MT 59717, USA.
William A. EDENS
Affiliation:
Department of Microbiology, Montana State University, Bozeman, MT 59717, USA.
Joan M. HENSON
Affiliation:
Department of Microbiology, Montana State University, Bozeman, MT 59717, USA.
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Abstract

Gaeumannomyces graminis var. tritici is the aetiologic agent of take-all disease of wheat and barley. Heavily-melanized variants of a lightly pigmented, virulent wild-type strain were isolated and characterized. These variants were phenotypically similar to Phialophora sp., the proposed anamorph of Gaeumannomyces graminis var. tritici. Unlike the wild-type G. graminis strain, Phialophora-like variants produced conidia and lost their ability to reproduce sexually after serial transfer. Some ascospores from initial self-crosses of the Phialophora-like variants regained the G. graminis phenotype, and these derivatives could again produce Phialophora-like variants. As with Phialophora isolates from the field, Phialophora-like variants produced in this study were non-pathogenic and produced less extracellular protein.

Type
Research Article
Information
Mycological Research , Volume 106 , Issue 10 , October 2002 , pp. 1179 - 1186
Copyright
© The British Mycological Society 2002

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