One Crop Disease, How Many Pathogens? Podosphaera xanthii and Erysiphe vignae sp. nov. Identified as the Two Species that Cause Powdery Mildew of Mungbean (Vigna radiata) and Black Gram (V. mungo) in Australia

Kelly, Lisa A. and Vaghefi, Niloofar ORCID: https://orcid.org/0000-0003-0430-4856 and Bransgrove, Kaylene and Fechner, Nigel A. and Stuart, Kara and Pandey, Abhay K. and Sharma, Mamta and Nemeth, Mark Z. and Liu, Shu-Yan and Tang, Shu-Rong and Nair, Ramakrishnan M. and Douglas, Colin A. and Kiss, Levente ORCID: https://orcid.org/0000-0002-4785-4308 (2021) One Crop Disease, How Many Pathogens? Podosphaera xanthii and Erysiphe vignae sp. nov. Identified as the Two Species that Cause Powdery Mildew of Mungbean (Vigna radiata) and Black Gram (V. mungo) in Australia. Phytopathology, 111 (7). pp. 1193-1206. ISSN 0031-949X


Abstract

Powdery mildew is a significant threat to mungbean (Vigna radiata) and black gram (V. mungo) production across Australia and overseas. Although they have been present in Australia for at least six decades and are easily recognized in the field, the precise identification of the pathogens causing this disease has remained unclear. Our goal was to identify the powdery mildew species infecting mungbean, black gram, and wild mungbean (V. radiata ssp. sublobata) in Australia. The internal transcribed spacer (ITS) and large subunit sequences of the ribosomal DNA and/or morphology of 57 Australian specimens were examined. Mungbean and black gram were infected by two species: Podosphaera xanthii and a newly recognized taxon, Erysiphe vignae sp. nov. Wild mungbean was infected only with P. xanthii. Mungbean and black gram powdery mildew ITS sequences from China, India, and Taiwan revealed the presence of only P. xanthii on these crops despite controversial reports of an Erysiphe species on both crops in India. Sequence analyses indicated that the closest relative of E. vignae is E. diffusa, which infects soybean (Glycine max) and other plants. E. vignae did not infect soybean in cross-inoculation tests. In turn, E. diffusa from soybean infected black gram and provoked hypersensitive response in mungbean. The recognition of a second species, E. vignae, as another causal agent of mungbean and black gram powdery mildew in Australia may complicate plant breeding efforts and control of the disease with fungicide applications.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 04 Jan 2022 23:55
Last Modified: 10 Jan 2022 03:00
Uncontrolled Keywords: Erysiphe diffusa; Erysiphe polygoni; Erysiphe vignae; Etiology; Fungal pathogens; New powdery mildew species; Pathogen detection; Podosphaera xanthii; Taxonomy; Vigna mungo; Vigna radiata (syn. Phaseolus aureus)
Fields of Research (2008): 06 Biological Sciences > 0605 Microbiology > 060505 Mycology
Fields of Research (2020): 31 BIOLOGICAL SCIENCES > 3107 Microbiology > 310705 Mycology
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences
Identification Number or DOI: https://doi.org/10.1094/PHYTO-12-20-0554-R
URI: http://eprints.usq.edu.au/id/eprint/45262

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