Molecular phylogenetic analyses reveal a close evolutionary relationship between <I>Podosphaera</I> (<I>Erysiphales</I>: <I>Erysiphaceae</I>) and its rosaceous hosts

Abstract

Podosphaera is a genus of the powdery mildew fungi belonging to the tribe Cystotheceae of the Erysiphaceae. Among the host plants of Podosphaera, 86 % of hosts of the section Podosphaera and 57 % hosts of the subsection Sphaerotheca belong to the Rosaceae. In order to reconstruct the phylogeny of Podosphaera and to determine evolutionary relationships between Podosphaera and its host plants, we used 152 ITS sequences and 69 28S rDNA sequences of Podosphaera for phylogenetic analyses. As a result, Podosphaera was divided into two large clades: clade 1, consisting of the section Podosphaera on Prunus (P. tridactyla s.l.) and subsection Magnicellulatae; and clade 2, composed of the remaining member of section Podosphaera and subsection Sphaerotheca. Because section Podosphaera takes a basal position in both clades, section Podosphaera may be ancestral in the genus Podosphaera, and the subsections Sphaerotheca and Magnicellulatae may have evolved from section Podosphaera independently. Podosphaera isolates from the respective subfamilies of Rosaceae each formed different groups in the trees, suggesting a close evolutionary relationship between Podosphaera spp. and their rosaceous hosts. However, tree topology comparison and molecular clock calibration did not support the possibility of co-speciation between Podosphaera and Rosaceae. Molecular phylogeny did not support species delimitation of P. aphanis, P. clandestina, P. ferruginea, P. spiraeae and P. tridactyla in their current circumscriptions, which suggests the need for revision of these species.

Identificación y alternativas de manejo de la cenicilla del rosal

“…The comparison of the nucleotide sequence obtained (KP902716), with thse deposited in the GenBank showed an identity of 99 to 100 % with P. pannosa accessions presents in Rosa sp. in Mexico, Belgium, the United States, Japan and Switzerland (Saenz and Taylor, 1999;Mori et al, 2000;Cunnington et al, 2003;Leus et al, 2006;Félix-Gastélum et al, 2014), in Rosa maltiflora Thunberg ex Murray from Japan, Rosa rubiginosa L. from Argentina (Takamatsu et al, 2010), and in Rosa rugosa Thunb. from Korea (Lee et al, 2011).…”

The current systematics and taxonomy of the powdery mildews (Erysiphales): an overview

“…A large number of regional monographs and checklists have been published. But, above all, the introduction of molecular methods in the taxonomy of the Erysiphales provided better insight into the phylogenetic context and structure of this fungal group and led to significant changes in the circumscriptions of the genera concerned (e.g., Saenz and Taylor 1999;Takamatsu et al 1999Takamatsu et al , 2000Takamatsu et al , 2008Takamatsu et al , 2010Mori et al 2000;Takamatsu 2004;Matsuda and Takamatsu 2003;Hirose et al 2005;Ito and Takamatsu 2010). The whole structure of the family Erysiphaceae has been altered and adapted in order to reflect the new anamorphic and phylogenetic knowledge.…”

First record of Podosphaera xanthii on Peperomia tetragona

“…In a ML tree (Fig. 2), the Korean isolate on P. tetragona was clustered into a clade that contained P. xanthii from several hosts, as supported by Takamatsu et al (2010). Thus, both the morphological characteristics and phylogenetic analysis support the identification of the newly collected powdery mildew fungus on P. tetragona as P. xanthii.…”