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A new species of Albugo parasitic to Arabidopsis thaliana reveals new evolutionary patterns in white blister rusts (Albuginaceae)

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Thines, M., Choi, Y.-J., Kemenes, E., Ploch, S., Holub, E. B., Shin, H.-D. and Jones, J. D. G.. (2009) A new species of Albugo parasitic to Arabidopsis thaliana reveals new evolutionary patterns in white blister rusts (Albuginaceae). Persoonia, Vol.22 . pp. 123-128. ISSN 0031-5850

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Official URL: http://dx.doi.org/10.3767/003158509X457931

Abstract

The obligate biotrophic lineages of the white blister rusts (Albuginales, Oomycota) are of ancient origin
compared to the rather recently evolved downy mildews, and sophisticated mechanisms of biotrophy and a high
degree of adaptation diversity are to be expected in these organisms. Speciation in the biotrophic Oomycetes is
usually thought to be the consequence of host adaptation or geographic isolation. Here we report the presence of
two distinct species of Albugo on the model plant Arabidopsis thaliana, Albugo candida and Albugo laibachii, the
latter being formally described in this manuscript. Both species may occupy the same host within the same environment,
but are nevertheless phylogenetically distinct, as inferred from analyses of both mitochondrial and nuclear
DNA sequences. Different ways of adapting to their host physiology might constitute an important factor of their
different niches. Evidence for this can be gained from the completely different host range of the two pathogens.
While Albugo candida is a generalist species, consisting of several physiological varieties, which is able to parasitize
a great variety of Brassicaceae, Albugo laibachii has not been found on any host other than Arabidopsis thaliana.
Therefore, Albugo laibachii belongs to a group of highly specialised species, like the other known specialist species
in Albugo s.s., Albugo koreana, Albugo lepidii and Albugo voglmayrii. The comparative investigation of the effector
genes and host targets in the generalist and the specialist species may constitute a model system for elucidating
the fundamental processes involved in plant pathogen co-adaptation and speciation.

Item Type:	Journal Article
Subjects:	S Agriculture > SB Plant culture
Divisions:	Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Library of Congress Subject Headings (LCSH):	Arabidopsis thaliana -- Diseases and pests, Albugo, Albuginaceae, Fungal diseases of plants, Fungi -- Genetics
Journal or Publication Title:	Persoonia
Publisher:	National Herbarium Nederland/Leiden Branch
ISSN:	0031-5850
Official Date:	26 May 2009
Volume:	Vol.22
Page Range:	pp. 123-128
Identification Number:	10.3767/003158509X457931
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), Deutsche Forschungsgemeinschaft (DFG), Landesstiftung Baden-Württemberg (LBW), Gatsby Charitable Foundation (GCF)
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URI:	http://wrap.warwick.ac.uk/id/eprint/894