Phylogenetic relationships of graminicolous downy mildews based on cox2 sequence data

Thines, Marco and Goker, Markus and Telle, Sabine and Ryley, Malcolm and Mathur, Kusum and Narayana, Yaladabagi D. and Spring, Otmar and Thakur, Ram P. (2008) Phylogenetic relationships of graminicolous downy mildews based on cox2 sequence data. Mycological Research, 112 (3). pp. 345-351. ISSN 0953-7562


Graminicolous downy mildews (GDM) are an understudied, yet economically important, group of plant pathogens, which are one of the major constraints to poaceous crops in the tropics and subtropics. Here we present a first molecular phylogeny based on cox2 sequences comprising all genera of the GDM currently accepted, with both lasting (Graminivora, Poakatesthia, and Viennotia) and evanescent (Peronosclerospora, Sclerophthora, and Sclerospora) sporangiophores. In addition, all other downy mildew genera currently accepted, as well as a representative sample of other oomycete taxa, have been included. It was shown that all genera of the GDM have had a long, independent evolutionary history, and that the delineation between Peronosclerospora and Sclerospora is correct. Sclerophthora was found to be a particularly divergent taxon nested within a paraphyletic Phytophthora, but without support. The results confirm that the placement of Peronosclerospora and Sclerospora in the Saprolegniomycetidae is incorrect. Sclerophthora is not closely related to Pachymetra of the family Verrucalvaceae, and also does not belong to the Saprolegniomycetidae, but shows close affinities to the Peronosporaceae. In addition, all GDM are interspersed throughout the Peronosporaceae s lat., suggesting that a separate family for the Sclerosporaceae might not be justified.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2007 The British Mycological Society. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 13 Jun 2014 06:12
Last Modified: 18 Aug 2014 06:17
Uncontrolled Keywords: Pennisetum glaucum; Peronosporaceae phylogeny; Sarga; Sorghum bicolour; Zea mays
Fields of Research : 06 Biological Sciences > 0605 Microbiology > 060505 Mycology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
06 Biological Sciences > 0603 Evolutionary Biology > 060309 Phylogeny and Comparative Analysis
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: 10.1016/j.mycres.2007.10.010

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