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Plectosporium alismatis comb. nov. a new placement for the Alismataceae pathogen Rhynchosporium alismatis

Published online by Cambridge University Press:  05 August 2004

Wayne M. PITT ,
Stephen B. GOODWIN ,
Gavin J. ASH ,
Norma J. COTHER  and
Eric J. COTHER
Wayne M. PITT
Affiliation:
Farrer Centre, School of Agriculture, Charles Sturt University, P.O. Box 588, Wagga Wagga, New South Wales 2678, Australia. E-mail: pittw@agr.gc.ca Present address: Agriculture and Agri-Food Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SKS7N 0X2, Canada.
Stephen B. GOODWIN
Affiliation:
Crop Production and Pest Control Research Unit, USDA Agricultural Research Service, Department of Botany and Plant Pathology, 915 West State Street, Purdue University, West Lafayette, IN 47907-2054, USA.
Gavin J. ASH
Affiliation:
Farrer Centre, School of Agriculture, Charles Sturt University, P.O. Box 588, Wagga Wagga, New South Wales 2678, Australia. E-mail: pittw@agr.gc.ca
Norma J. COTHER
Affiliation:
New South Wales Agriculture, Agricultural Research Institute, Forest Road, Orange, New South Wales 2800, Australia.
Eric J. COTHER
Affiliation:
New South Wales Agriculture, Agricultural Research Institute, Forest Road, Orange, New South Wales 2800, Australia.
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Abstract

The phytopathogen Rhynchosporium alismatis, occurring on Alisma, Sagittaria and other genera in the Alismataceae, is under investigation as a mycoherbicide for alismataceous weeds in Australian rice crops. The type species of Rhynchosporium, R. secalis, belongs in the Helotiales while the phylogenetic relationships of R. alismatis were unknown. To identify fungi related to R. alismatis, the internal transcribed spacer (ITS) region of the ribosomal DNA (ITS1, 5.8S rRNA gene, ITS2) of 56 isolates was sequenced and compared to those available in databases. Analysis of ITS sequences revealed close relationships between R. alismatis and the teleomorph genus Plectosphaerella, as well as several anamorphic fungi which were primarily species of Verticillium. Rhynchosporium alismatis and Plectosphaerella cucumerina clustered together with 98% bootstrap support. Morphological comparisons supported this relationship indicating that R. alismatis and the anamorphic genus Plectosporium are congeneric. Rhynchosporium alismatis is transferred to Plectosporium, a name proposed for conservation.

Type
Research Article
Information
Mycological Research , Volume 108 , Issue 7 , July 2004 , pp. 775 - 780
Copyright
© The British Mycological Society 2004

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