Molecular phylogenetic analysis of Peronosclerospora (Oomycetes) reveals cryptic species and genetically distinct species parasitic to maize

Telle, Sabine and Shivas, Roger G. and Ryley, Malcolm J. and Thines, Marco (2011) Molecular phylogenetic analysis of Peronosclerospora (Oomycetes) reveals cryptic species and genetically distinct species parasitic to maize. European Journal of Plant Pathology, 130 (4). pp. 521-528. ISSN 0929-1873


Downy mildews are amongst the most widespread and economically important pathogens of cultivated grasses in the tropics and subtropics. Despite their importance, molecular methods, particularly DNA sequence analysis, have rarely been applied to either species identification or to the determination of phylogenetic relationships between species. Here we report the presence of several cryptic species in the genus Peronosclerospora. Further we confirm that maize can be parasitised by several species of Peronosclerospora, including P. eriochloae, which has not been reported previously as a pathogen of maize. The presence of 14 distinct phylogenetic lineages, including three that are parasitic to maize, highlights the current fragmentary knowledge on the diversity and classification of
species within Peronosclerospora. Species identification
in Peronosclerospora has been traditionally based on the host genus and a set of variable morphological characteristics, which has meant that the identification of species is often unreliable. This situation is primed for the application of molecular techniques for the identification of species. One of the lineages parasitic to maize in Australia has not yet been formally described and its distribution is not known. Future investigation including a broad sampling of downy mildews from maize and other cultivated and native grasses on a world-wide basis
is a prerequisite to a re-evaluation of quarantine
regulations aimed at restricting or limiting their spread.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright KNPV 2011. Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 05 Jun 2014 02:07
Last Modified: 09 Feb 2017 05:09
Uncontrolled Keywords: cox2; graminicolous downy mildews; host range; large nuclear ribosomal subunit; nrLSU; Peronosporaceae; quarantine; Sclerosporaceae
Fields of Research : 06 Biological Sciences > 0699 Other Biological Sciences > 069999 Biological Sciences not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: 10.1007/s10658-011-9772-8

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