First Report of Powdery Mildew Caused by <i>Erysiphe alphitoides</i> on <i>Ipomoea obscura</i> in China

Pan, Yingwen; Wu, Hua; Di, Rong

doi:10.1094/pdis-07-19-1513-pdn

Cited by 6 publications

(2 citation statements)

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“…[27]. Recently, a study reported the powdery mildew E. alphitoides on I. obscura in China [34] but the sequence of their sample (HNIO-18) was closer to E. ipomoeae (Figure 1). It appears that E. ipomoeae may occupy a wider geographic range in East and Southeast Asia.…”

Section: Discussionmentioning

confidence: 94%

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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: Discussionmentioning

confidence: 94%

“…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%