Identification and classification of powdery mildew anamorphs using light and scanning electron microscopy and host range data

Cook, R. T. A.; Inman, A. J.; Billings, Charles E.

doi:10.1017/s095375629700364x

Cited by 149 publications

(78 citation statements)

References 10 publications

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“…Conidia developed singly and were doliform, ellipsoid-cylindrical, 26· 2 -35· 7 × 12· 4 -15· 9 µ m, aseptate, mostly having oil drops and no fibrosin bodies seen. Chasmothecia were absent but based on the morphological characteristics of the anamorph the organism conforms to Oidium subgenera Pseudoidium (Cook et al , 1997). Previous records of powdery mildew on Deutzia (Bolay et al , 2005) indicate it is most likely Erysiphe deutziae (syn.…”

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confidence: 75%

First report of powdery mildew (Oidium sp.) on greater celandine (Chelidonium majus)

Jankovics

2007

Plant Pathology

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Since 2004, symptoms of powdery mildew infection were observed on greater celandine ( Chelidonium majus ), a common weed of shaded habitats, in several places in Hungary. Sporulating mildew mycelia covered large areas of the upper, and rarely the lower, leaf surfaces, in addition to the petioles and unripe capsular fruits. The pathogen was identified as a powdery mildew anamorph belonging to the genus Oidium subgenus Pseudoidium. Conidia were cylindrical to doliiform, measured 25-48 × 10 -20 µ m and were produced singly on 80 -150 µ m long conidiophores consisting of a foot-cell measuring 20 -40 × 7-10 µ m, followed by two or three shorter cells. During conidial germination, short germ tubes were produced apically terminating in lobed appressoria. Hyphal appressoria were lobed or multi-lobed. The teleomorph stage was not found. Specimens were deposited in the herbarium of Martin Luther University, Halle, Germany (HAL 1842 F).No well-founded report of powdery mildew on C. majus is known worldwide (Braun, 1987;1995). To contribute to a more precise identification of the fungus, DNA was extracted from its mycelium, the internal transcribed spacer (ITS) region of the ribosomal DNA was PCR-amplified, cloned and sequenced as described in Landwehr et al. (2002) for Glomus . The ITS sequence (GenBank accession number DQ665673) was 99% similar to those determined in O. neolycopersici infecting tomato in Europe and North America (Kiss et al ., 2005). However, cross-inoculation tests using conidia of O. neolycopersici and those of the C. majus -mildew showed that these pathogens could infect their host plants only. The tests were repeated three times in two greenhouses using healthy potted C. majus and tomato plants kept in isolation after artificial inoculations. Non-inoculated plants served as controls. These results confirmed the pathogenicity of the Oidium sp. on C. majus .

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First report of powdery mildew (Oidium sp.) on greater celandine (Chelidonium majus)

Jankovics

2007

Plant Pathology

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“…Phylogeny and evolution of this fungal group have been discussed based on the molecular phylogenetic analyses using the nucleotide sequences of the rDNA region (Takamatsu 2004(Takamatsu , 2013a. Taxonomy of the powdery mildews has been largely changed based on these analyses as well as morphological observations during the past quarter century (Cook et al 1997, Braun 1999, Saenz and Taylor 1999, Braun and Takamatsu 2000, Braun and Cook 2012.…”

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confidence: 99%

First comprehensive phylogenetic analysis of the genus Erysiphe (Erysiphales, Erysiphaceae) II: the Uncinula lineage

Takamatsu¹,

Ito²,

Shiroya

et al. 2015

Mycologia

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Phylogenetic relationships of the Uncinula lineage, which is the basal group in the genus Erysiphe, were investigated with 167 sequences of nuc ITS1-5. 8S-ITS2 and the 28S rDNA regions. Backbone tree analyses with six datasets and two tree-constructing methods revealed that the Uncinula lineage is divided into seven distinct clades. Clades 1-5 each contained a representative powdery mildew species, namely E. australiana in Clade 1, E. liquidambaris in Clade 2, E. adunca in Clade 3, E. fraxinicola in Clade 4 and E. actinidiae in Clade 5. Clade 6 comprises 71 sequences including the Microsphaera lineage and 17 species of the Uncinula lineage, such as E. carpinicola, E. carpinilaxiflorae, E. miyabei, E. glycines and E. necator. Topology tests supported the Microsphaera lineage forming a monophyletic clade in Clade 6, suggesting that Microsphaera-type appendages appeared only once in this clade to diverge into the Microsphaera lineage. Clade 7 consists of 72 sequences containing 30 species, including species of sects. Californiomyces and Typhulochaeta, four species from Nothofagus, species of sect. Erysiphe parasitising herbaceous plants belonging to the Asteraceae, Rosaceae and Saxifragaceae. Molecular clock analysis suggests that the major seven clades appeared 50-30 million years ago (Ma) in the Paleogene Period. The Microsphaera lineage may have split from the Uncinula lineage at the boundary of the Paleogene and Neogene, when appendages with dichotomously branched tips appeared. The clade of the species on Nothofagus split from the northern hemisphere species about 20-10 million years ago (Ma) in the Miocene Epoch, and host-shift from trees to herbs also might have occurred in this period.

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“…Fibrosin bodies were present in conidiophores and conidia. Based on these morphological characters the fungus was identified as a powdery mildew belonging to the genus Podosphaera (Cook et al 1997). No perfect stage (chasmothecium) was found.…”

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confidence: 99%

First report of powdery mildew ofAgeratum houstonianumin India

Baiswar

Chandra

Ngachan

2008

Austral. Plant Disease Notes

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Identification and classification of powdery mildew anamorphs using light and scanning electron microscopy and host range data

Cited by 149 publications

References 10 publications

First report of powdery mildew (Oidium sp.) on greater celandine (Chelidonium majus)

First report of powdery mildew (Oidium sp.) on greater celandine (Chelidonium majus)

First comprehensive phylogenetic analysis of the genus Erysiphe (Erysiphales, Erysiphaceae) II: the Uncinula lineage

First report of powdery mildew ofAgeratum houstonianumin India

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