Hosts of asexual morph of Erysiphe quercicola from Thailand

Meeboon, Jamjan; Takamatsu, Susumu

doi:10.1007/s40858-019-00326-8

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…The sequences of the PMs used in this study are listed in Table 1 [9,11,19,[24][25][26]29,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. To determine the phylogenetic relationships using ITS and concatenated sequences of ITS and TUB2, the sequences were aligned using the MAFFT v.7 online version (https://mafft.cbrc.…”

Section: Molecular Phylogenymentioning

confidence: 99%

“…In the present study, the occurrence periods of the PMs in the winter and spring imply they prefer mild weather instead of excessively high temperature (up to 35 • C) in summer, and it is suggested that the PMs in the subtropical regions may stay in a quiescent state in their hosts during hot summers. However, chasmothecia are rarely formed in subtropical and tropical environments [23,47,77,94]. Thus, the reservoirs of the PMs on all their possible hosts as mycelia or other structures are crucial for their survival and for the infection in the next season.…”

Section: Perennation Of Powdery Mildews In the Subtropics And The Imp...mentioning

confidence: 99%

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New Records of Powdery Mildews from Taiwan: Erysiphe ipomoeae comb. nov., E. aff. betae on Buckwheat, and E. neolycopersici comb. nov. on Cardiospermum halicacabum

Hsiao¹,

Ariyawansa

Hsu³

et al. 2022

Diversity

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Erysiphe is the largest genus of powdery mildews (PMs), a group of obligate plant pathogenic fungi. Exploration of biodiversity generally relies on regional surveys and our aim is to investigate the PMs in Taiwan. Collections of the fungi on five plant species around agricultural environments were subjected to morphological and molecular characterization, using both internal transcribed spacer (ITS) and β-tubulin gene (TUB2) regions for the phylogenetic analyses. Erysipheipomoeae comb. nov., a species able to infect Ipomoea obscura and I. aquatica demonstrated by pathogenicity tests, has been neotypified. The two buckwheat species, Fagopyrum esculentum and F. tataricum, are found to be hosts of E. aff. betae. These results suggest that hosts in some plant families can be infected by more than one Erysiphe pathogen, e.g., Convolvulaceae by E. ipomoeae and E. convolvuli and Polygonaceae by E. polygoni and E. aff. betae, respectively. In addition, phylogenetic analyses of PMs on Cardiospermum halicacabum and tomato belonging to the E. aquilegiae complex are allocated under E. neolycopersici comb. nov. This extends the potential host range of E. aquilegiae complex to the plant family Sapindaceae. We conclude that awareness of the host associations of PMs can potentially benefit crop disease management.

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Section: Molecular Phylogenymentioning

confidence: 99%

Section: Perennation Of Powdery Mildews In the Subtropics And The Imp...mentioning

confidence: 99%

New Records of Powdery Mildews from Taiwan: Erysiphe ipomoeae comb. nov., E. aff. betae on Buckwheat, and E. neolycopersici comb. nov. on Cardiospermum halicacabum

Hsiao¹,

Ariyawansa

Hsu³

et al. 2022

Diversity

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“…Depending on the specimen and likely also the environment, host plant, and the investigator, remarkable morphological differences were found in the anamorph stages, e.g., lengths of foot cells of conidiophores and conidia and numbers of conidiophores per hyphal mother cell. Teleomorph development in Erysiphales is generally rare in low altitudes of tropical and subtropical regions (Meeboon and Takamatsu 2020). Kuo et al (1991), however, found ascomata of P. xanthii (as S. fusca) in the winter season in central Taiwan.…”

Section: Podosphaera Xanthii In Taiwanmentioning

confidence: 99%

Host plants of the powdery mildew fungus Podosphaera xanthii in Taiwan

Yeh

Wen

et al. 2020

Trop. plant pathol.

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Podosphaera xanthii is presently considered as one of the powdery mildew fungi with the broadest host range. Confusion is caused by taxonomical and nomenclatural changes of the host plants and the fungal parasite. Based on the list of powdery mildews from Taiwan from 1998, an updated list of host plants of P. xanthii in this country is presented. New hosts from Taiwan are wild and horticultural herbs and woody plants collected between 2011 and 2020. Fifteen plant species were found to be the host of P. xanthii based on new collections of the anamorph and internal transcribed spacer (ITS) sequences. Among them, Cuphea carthagenensis, Cuphea hyssopifolia, Erigeron bellioides, Mazus pumilus, Phyllanthus tenellus, Salvia farinacea, and Sphagneticola trilobata were new hosts worldwide, whereas Bidens pilosa, Eclipta prostrata, Pouzolzia zeylanica, and Torenia fournieri were new hosts in Taiwan. Four further plant species were confirmed as known hosts (Emilia sonchifolia, Sesamum indicum, Trema orientalis, Zinnia elegans). Asteraceae contained most host species in Taiwan, which appeared proportional to the high species diversity in this plant family. The second highest host diversity in the Cucurbitaceae, however, was not proportional to plant diversity. Although the fungus is able to cause similar symptoms on a broad range of hosts, certain host species showed specific responses to infection. In some species, infection remains limited to old leaves, whereas in other species, only young leaves or mainly stems are infected.

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“…For obtaining DNA from powdery mildews, careful selection of clean, fresh specimens is necessary, since powdery mildews cannot be cultivated in vitro, are often contaminated by other microscopic fungi and DNA deteriorates quickly during drying specimens. In Erysiphales, the ITS is the single available barcode for species identification particularly through the accomplishments of Takamatsu (Takamatsu et al 2015a , b ; Meeboon and Takamatus 2016 , 2017a , b , 2020 ). Five species of powdery mildews were identified here based primarily on ITS sequence data.…”

Section: Discussionmentioning

confidence: 99%

“…Under tropical/subtropical conditions, however, instead of rarely formed ascomata, asexual structures such as mycelial appressoria, conidiophores and conidia of the anamorph stage provide the single morphological features which are less diagnostic for morphological species identification (Piepenbring et al 2011 ). Under such conditions, sequences of the internal transcribed spacer (ITS) of the ribosomal RNA genes have become an important tool for species identification (Takamatsu et al 2015a , b , Meeboon and Takamatsu 2016 , 2017a , b , 2020 ; Khodaparast et al 2019 ). Identification and documentation of Erysiphales in Taiwan started over one hundred years ago, followed by occasional records of few other mycologists and plant pathologists as compiled by Kuo ( 1998 ) and subsequent publications (Kirschner and Chen 2008 ; Kirschner and Liu 2014 ; Chen and Kirschner 2018 ; Yeh et al 2018 ; Kirschner et al 2020 ).…”

Section: Introductionmentioning

confidence: 99%

First records of powdery mildew fungi (Erysiphales) on medicinal plants in Taiwan

et al. 2021

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Background Production of medicinal plants in Taiwan is not only hampered by international market competition, but also lack of knowledge of their pathogens, such as powdery mildew fungi (Erysiphales, Ascomycota). Records of these fungi in Taiwan originate from few researchers for the last one hundred years and are still incomplete. Since powdery mildews in tropical/subtropical environments rarely develop the sexual stages with morphologically diagnostic characteristics, internal transcribed spacer sequences (ITS) of the ribosomal RNA genes obtained from the asexual stages have become important modern tools for species identification. Results Powdery mildews on medicinal plants from educational and ornamental plantations in Taiwan were identified based on the anamorph morphology and ITS sequences. Four powdery mildews on medicinal plants are new records for Taiwan, Arthrocladiella mougeotii on Lycium chinense, Erysiphe glycines on Pueraria lobata, Erysiphe lespedezae on Bauhinia sp., Desmodium caudatum, and Uraria crinita, and E. lonicerae on Lonicera japonica. Eryngium foetidum is a new host for Erysiphe heraclei hitherto known on other host plants in Taiwan. Eryngium foetidum and Uraria crinita are new host plants for powdery mildews worldwide. Only specific field collection of the pathogens yielded the new records, not checking plant specimens in a phanerogam herbarium. The pathogens did not cause death of the host plants, but appeared to enhance stress by infection of mature leaves. Conclusions Taxonomic study of powdery mildews in Taiwan results into new host records of economically important medicinal plants in Taiwan with potential consequences for plant production and quarantine and also shows that host records are quite incomplete worldwide. Although ITS sequences were useful for species identification, the lack of data for several species on the same host genus on the one hand and the low variation between closely related species on the other indicate the need for further study.

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Hosts of asexual morph of Erysiphe quercicola from Thailand

Cited by 10 publications

References 33 publications

New Records of Powdery Mildews from Taiwan: Erysiphe ipomoeae comb. nov., E. aff. betae on Buckwheat, and E. neolycopersici comb. nov. on Cardiospermum halicacabum

New Records of Powdery Mildews from Taiwan: Erysiphe ipomoeae comb. nov., E. aff. betae on Buckwheat, and E. neolycopersici comb. nov. on Cardiospermum halicacabum

Host plants of the powdery mildew fungus Podosphaera xanthii in Taiwan

First records of powdery mildew fungi (Erysiphales) on medicinal plants in Taiwan

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