Cucumis sativus and Ipomoea purpurea: New hosts for Alternaria hydrangeae in China

Alternaria leaf spot is a common disease on various plants worldwide. In this study, an Alternaria species, A. hydrangeae causing leaf spot on Cucumis sativus (cucumber) and Ipomoea purpurea in China was identified based on morphology and multi‐locus analysis of the partial ITS, GAPDH, Alt a 1, TEF1...

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Bibliographic Details
Published in:Journal of phytopathology 2023-01, Vol.171 (1), p.48-56
Main Authors: Liu, Feng‐Yin, Gou, Ya‐Nan, Liu, Tong‐Yao, Huang, Cheng‐Xin, Deng, Jian‐Xin
Format: Article
Language:English
Subjects:
Alternaria
Alternaria hydrangeae
Alternaria leaf spot
Cucumis sativus
Fungi
Glyceraldehyde-3-phosphate dehydrogenase
Host range
Ipomoea purpurea
Leafspot
Leaves
Morphology
Pathogenicity
Pathogens
Plant diseases
Plants
Signs and symptoms
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Summary:Alternaria leaf spot is a common disease on various plants worldwide. In this study, an Alternaria species, A. hydrangeae causing leaf spot on Cucumis sativus (cucumber) and Ipomoea purpurea in China was identified based on morphology and multi‐locus analysis of the partial ITS, GAPDH, Alt a 1, TEF1, and RPB2 gene regions. The pathogenicity of the present isolates and a representative isolate of A. hydrangeae were assessed on living leaves of C. sativus, I. purpurea and Hydrangea paniculata. Similar symptoms were observed on every plant inoculated with the isolates. The same fungus was re‐isolated from inoculated leaves fulfilling Koch's postulates. Morphology of the original and re‐isolated isolates showed characteristics similar to A. hydrangeae with some variations. Multi‐locus analysis indicated that the present isolate fell into A. hydrangeae clade. This study is the first report of A. hydrangeae as an agent of Alternaria leaf spot in C. sativus and I. purpurea in China, which extends the host range of the fungus.
ISSN:0931-1785
1439-0434
DOI:10.1111/jph.13154