Phylogeny and taxonomy of powdery mildew fungi of Erysiphe sect. Uncinula on Carpinus species

Braun, Uwe; Takamatsu, Susumu; Heluta, V.P.; Limkaisang, Saranya; Divarangkoon, Rangsi; Cook, R. T. A.; Boyle, Herbert

doi:10.1007/s11557-006-0509-6

Cited by 50 publications

(27 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The phylogeny of Erysiphales was extensively revisited (Hirata and Takamatsu 1996;Takamatsu et al 1998Takamatsu et al , 1999Takamatsu et al , 2006Takamatsu et al , 2007Saenz and Taylor 1999;Braun and Takamatsu 2000;Cunnington et al 2003;Takamatsu 2004;Limkaisang et al 2005Limkaisang et al , 2006Braun et al 2006). In particular, molecular studies of numerous powdery mildew species in the former Erysiphe, Microsphaera, and Uncinula genera showed that they formed a separate, monophyletic clade, characterized by common morphological characters.…”

Section: Interspecific Diversitymentioning

confidence: 99%

Interspecific and intraspecific diversity in oak powdery mildews in Europe: coevolution history and adaptation to their hosts

et al. 2011

View full text Add to dashboard Cite

Quercus has been reported as the genus with the largest number of attacking powdery mildews. In Europe, oak powdery mildew was rarely reported before 1907, when severe outbreaks were observed. These epidemics were attributed to the newly described species Erysiphe alphitoides, presumed to be of exotic origin. After the burst of interest following the emergence of the disease, research on this topic remained very limited. Interest in research was recently reactivated in response to the availability of molecular tools. This review summarizes current knowledge on the diversity of oak powdery mildews in Europe and their possible evolutionary relationships with European oaks. The most striking results are the evidence of cryptic diversity (detection in France of a lineage closely related to Erysiphe quercicola, previously thought to only have an Asian distribution), large host range (similarity of E. alphitoides and E. quercicola with powdery mildews of tropical plants) but also local adaptation to Quercus robur. These recent findings highlight the complexity of the history of oak powdery mildew in Europe and point to the question of host specialization and host jumps in the evolution of powdery mildew fungi.

show abstract

Section: Interspecific Diversitymentioning

confidence: 99%

Interspecific and intraspecific diversity in oak powdery mildews in Europe: coevolution history and adaptation to their hosts

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Identification of anamorphic species of the Erysiphales using light microscopy is, however, often less reliable than identification of the teleomorph stage (8,32). Molecular tools, in particular the analysis of the internal transcribed spacer (ITS) sequences of the nuclear ribosomal DNA (rDNA), were useful in the precise identification of a large number of powdery mildew anamorphs (6,7,11,12,14,22,27,33,34). Thus, we supplemented our work with ITS sequence analyses to confirm the identity of O. longipes in the United States and also to investigate its phylogenetic relationship with some other powdery mildew pathogens.…”

mentioning

confidence: 99%

Oidium longipes, A New Powdery Mildew Fungus on Petunia in the USA: A Potential Threat to Ornamental and Vegetable Solanaceous Crops

et al. 2008

View full text Add to dashboard Cite

This is the first North American report of Oidium longipes, an anamorphic powdery mildew species described recently in Europe. It was found on vegetatively propagated petunia grown in a commercial greenhouse in New Jersey, USA, where it caused a rapidly spreading disease. The pathogen might have originated offshore and may have already been distributed in the United States through horticultural trade. During field surveys in Europe, it was found on petunia in Hungary and Austria as well; this is the first report of O. longipes from these two countries. A detailed light microscopy study of American and European specimens of O. longipes, including freshly collected samples and authentic herbarium specimens, revealed that its conidiophore morphology is more variable than illustrated in the original species description or in subsequent works. Microcycle conidiation, a process not yet known to occur in powdery mildews, was repeatedly observed in O. longipes. The rDNA internal transcribed spacer (ITS) sequences were identical in colonies containing different conidiophore types as well as in a total of five specimens collected from petunia in the United States, Austria, Hungary, Germany, and Switzerland. A phylogenetic analysis of the ITS sequences revealed that the closest known relative of O. longipes is O. lycopersici, known to infect tomato only in Australia. Cross-inoculation tests showed that O. longipes from petunia heavily infected tobacco cv. Xanthi, while the tomato and eggplant cultivars tested were moderately susceptible to this pathogen. These results indicate that its spread represents a potential danger to a number of solanaceous crops. Our ad hoc field surveys conducted in 2006 and 2007 did not detect it outside New Jersey in the United States; all the other powdery mildew–infected petunias, collected in New York and Indiana, were infected by Podosphaera xanthii. In Europe, most of the powdery mildew–infected petunias examined in this study were infected by P. xanthii or Golovinomyces orontii. Our multiple inoculation tests revealed that the same petunia plants and even the same leaves can be infected concomitantly by O. longipes, O. neolycopersici, G. orontii, and P. xanthii. Thus, it is at present unclear to what extent O. longipes contributes to the powdery mildew epidemics that develop year after year on solanaceous plants in many parts of the world.

show abstract

“…This has also happened during the first period of the European spread of E. symphoricarpi on snowberry, thought to be native to North America (33), and that of E. arcuata on hornbeam, thought to be introduced from Asia (10). In the meantime, there was no loss of the sexual reproduction in the native areas of any of these three species (10,12,33). These examples show that at least some powdery mildew populations can rapidly spread and occupy new geographical areas, or infect new host plant species (65), even in the absence of the sexual stage.…”

Section: Discussionmentioning

confidence: 85%

“…All the molecular phylogenetic studies carried out so far have shown that the differences in the rDNA ITS sequences always correlated with the delimitation of different species and formae speciales of the Erysiphales because these sequences were always identical or 99% similar within, but always differed among, all the welldefined taxa identified based on morphological and/or host range criteria (10,13,22,23,25,33,57). However, the species boundaries and the level of genetic isolation in morphologically indistinguishable powdery mildews found on different hosts, and exhibiting very similar, but not identical, ITS sequences, have not been clearly determined yet.…”

mentioning

confidence: 99%

Oidium neolycopersici: Intraspecific Variability Inferred from Amplified Fragment Length Polymorphism Analysis and Relationship with Closely Related Powdery Mildew Fungi Infecting Various Plant Species

Jankovics¹,

Bai²,

Kovács³

et al. 2008

Phytopathology®

View full text Add to dashboard Cite

Jankovics, T., Bai, Y., Kovács, G. M., Bardin, M., Nicot, P. C., Toyoda, H., Matsuda, Y., Niks, R. E., and Kiss, L. 2008. Oidium neolycopersici: Intraspecific variability inferred from amplified fragment length polymorphism analysis and relationship with closely related powdery mildew fungi infecting various plant species. Phytopathology 98:529-540.Previous works indicated a considerable variation in the pathogenicity, virulence, and host range of Oidium neolycopersici isolates causing tomato powdery mildew epidemics in many parts of the world. In this study, rDNA internal transcribed spacer (ITS) sequences, and amplified fragment length polymorphism (AFLP) patterns were analyzed in 17 O. neolycopersici samples collected in Europe, North America, and Japan, including those which overcame some of the tomato major resistance genes. The ITS sequences were identical in all 10 samples tested and were also identical to ITS sequences of eight previously studied O. neolycopersici specimens. The AFLP analysis revealed a high genetic diversity in O. neolycopersici and indicated that all 17 samples represented different genotypes. This might suggest the existence of either a yet unrevealed sexual reproduction or other genetic mechanisms that maintain a high genetic variability in O. neolycopersici. No clear correlation was found between the virulence and the AFLP patterns of the O. neolycopersici isolates studied. The relationship between O. neolycopersici and powdery mildew anamorphs infecting Aquilegia vulgaris, Chelidonium majus, Passiflora caerulea, and Sedum alboroseum was also investigated. These anamorphs are morphologically indistinguishable from and phylogenetically closely related to O. neolycopersici. The crossinoculation tests and the analyses of ITS sequences and AFLP patterns jointly indicated that the powdery mildew anamorphs collected from the above mentioned plant species all represent distinct, but closely related species according to the phylogenetic species recognition. All these species were pathogenic only to their original host plant species, except O. neolycopersici which infected S. alboroseum, tobacco, petunia, and Arabidopsis thaliana, in addition to tomato, in cross-inoculation tests. This is the first genome-wide study that investigates the relationships among powdery mildews that are closely related based on ITS sequences and morphology. The results indicate that morphologically indistinguishable powdery mildews that differed in only one to five single nucleotide positions in their ITS region are to be considered as different taxa with distinct host ranges.

show abstract

Phylogeny and taxonomy of powdery mildew fungi of Erysiphe sect. Uncinula on Carpinus species

Cited by 50 publications

References 23 publications

Interspecific and intraspecific diversity in oak powdery mildews in Europe: coevolution history and adaptation to their hosts

Interspecific and intraspecific diversity in oak powdery mildews in Europe: coevolution history and adaptation to their hosts

Oidium longipes, A New Powdery Mildew Fungus on Petunia in the USA: A Potential Threat to Ornamental and Vegetable Solanaceous Crops

Oidium neolycopersici: Intraspecific Variability Inferred from Amplified Fragment Length Polymorphism Analysis and Relationship with Closely Related Powdery Mildew Fungi Infecting Various Plant Species

Contact Info

Product

Resources

About