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Phylogenetic relationships of graminicolous downy mildews based on cox2 sequence data

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Thines, M., Goker, M., Telle, S., Ryley, M., Mathur, K., Narayana, Y.D., Spring, O. and Thakur, R.P. (2008) Phylogenetic relationships of graminicolous downy mildews based on cox2 sequence data. Mycological Research, 112 (3). pp. 345-351.

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Article Link: http://dx.doi.org/10.1016/j.mycres.2007.10.010

Publisher URL: http://www.elsevier.com


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.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science, Plant Science
Business groups:Crop and Food Science
Additional Information:© The British Mycological Society.
Keywords:Pennisetum glaucum; Peronosporaceae phylogeny; Sarga; Sorghum bicolour; Zea mays.
Subjects:Science > Botany > Cryptogams
Science > Biology > Genetics
Plant pests and diseases > Plant pathology
Live Archive:12 Jan 2009 02:03
Last Modified:03 Sep 2021 16:43

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