Broad host range species in specialised pathogen groups should be treated with suspicion – a case study on Entyloma infecting Ranunculus

Kruse, J. and Piatek, M. and Lutz, M. and Thines, M. (2018) Broad host range species in specialised pathogen groups should be treated with suspicion – a case study on Entyloma infecting Ranunculus. Persoonia, 41. pp. 175-201. ISSN 0031-5850

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Abstract

Plant pathogenic smut fungi in the broader sense can be divided into the Ustilaginomycetes, which cause classical smut symptoms with masses of blackish spores being produced in a variety of angiosperms, and the Exobasidiomycetes, which are often less conspicuous, as many do not shed large amounts of blackish spores. The leaf-spot causing members of the genus Entyloma (Entylomatales, Exobasidiomycetes) belong to the latter group. Currently, 172 species that all infect eudicots are included in the genus. Vánky (2012) recognised five Entyloma species on species of Ranunculus s.lat. Two have been reported only from Ficaria verna s.lat., while three, E. microsporum, E. ranunculi-repentis, E. verruculosum, have been reported to have a broad host range, encompassing 30, 26, and 5 species of Ranunculus, respectively. This broad host range is in contrast to the generally high host specificity assumed for species of Entyloma, indicating that they may represent complexes of specialised species. The aim of this study was to investigate Entyloma on Ranunculus s.lat. using multigene phylogenies and morphological comparisons. Phylogenetic analyses on the basis of up to four loci (ITS, atp2, ssc1, and map) showed a clustering of Entyloma specimens according to host species. For some of these Entyloma lineages, names not currently in use were available and reinstated. In addition, Entyloma microsporum s.str. is neotypified. Six novel species are described in this study, namely, Entyloma jolantae on Ranunculus oreophilus, E. klenkei on R. marginatus, E. kochmanii on R. lanuginosus, E. piepenbringiae on R. polyanthemos subsp. nemorosus (type host) and R. repens, E. savchenkoi on R. paludosus, and E. thielii on R. montanus. For all species diagnostic bases and morphological characteristics are provided. The results in this study once more highlight the importance of detailed re-investigation of broad host-range pathogens of otherwise specialised plant pathogen groups.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited according to a Creative Commons 4.0 license.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health
Date Deposited: 19 Mar 2019 04:38
Last Modified: 05 Apr 2019 01:50
Uncontrolled Keywords: Entyloma microsporum complex; Entyloma ranunculi-repentis complex; host specificity; multigene analyses; new primers; six new taxa; smut fungi
Fields of Research : 06 Biological Sciences > 0603 Evolutionary Biology > 060307 Host-Parasite Interactions
06 Biological Sciences > 0605 Microbiology > 060505 Mycology
Identification Number or DOI: 10.3767/persoonia.2018.41.09
URI: http://eprints.usq.edu.au/id/eprint/36196

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