Pseudocercosporella ipomoeae
Pseudocercosporella ipomoeae Sawada ex Deighton, Mycol. Pap. 133: 38 (1973).
Index Fungorum number: IF 321749; Facesoffungi number: FoF 11208, Fig. 1
Description: see Frank et al. (2010) and Videira et al. (2017).
Material examined: see Frank et al. (2010) and Videira et al. (2017).
Fig. 1 Pseudocercosporella bakeri (CPC 17570, holotype, re-drawn from Fig. 9 in Frank et al. 2010). a Leaf spot on host. b Conidiophores in vivo. c, d Conidiophores in vitro (arrows denote loci). e Conidia in vitro. Scale bars = 10 μm.
Importance and distribution
There are 127 Pseudocercosporella epithets in Index Fungorum (2022), but several species have been transferred to other genera such as Cercoseptoria, Cercosporella, Cylindrosporium, Filiella, Heterosphaeria, Mycosphaerella, Neopseudocercosporella, Oculimacula, Pseudocercospora, Pseudophloeosporella, Ramulispora, Septoria, Sphaerulina and Thedgonia. Pseudocercosporella comprises 96 species known on several host plants such as Achillea millefolium (Asteraceae), Aconitum vulparia (Ranunculaceae), Allium subhirsutum (Amaryllidaceae), Apocynum androsaemifolium (Apocynaceae), Astragalus alpinus (Fabaceae), Dryopteris carthusiana (Dryopteridaceae), Ipomoea acuminata (Convolvulaceae), Phaseolus vulgaris (Fabaceae), Rubus ellipticus (Rosaceae), Triticum aestivum (Poaceae) and others. Pseudocercosporella has a wide distribution including Asia (Hong Kong, Kazakhstan, Nepal, Russia, South Korea), Europe (Bulgaria, France, Germany, Italy, Norway, Switzerland), North America (Canada, the United States). Pseudocercosporella has high diversity but few species have molecular data. Future studies must aim to collect more taxa of Pseudocercosporella and identification must be done by molecular data.
Quarantine significance
Pseudocercosporella may be of quarantine concern as several species are pathogenic, for example, P. capsellae is the causative agent of white leaf spot disease in Brassicaceae (Gunasinghe et al. 2016), P. inconspicua causes lily leaf spot (Ingram and Levy 2019).
Biochemical importance of the genus, chemical diversity or applications
Pseudocercosporella produces the toxin cercosporin (Gunasinghe et al. 2016).
References
Arx JA von. 1983 – Mycosphaerella and its anamorphs. Proceedings van de Koninklijke Nederlandse Akademie van Wetenschappen Series 86, 15–54.
Braun U. 1995 – Miscellaneous notes on phytopathogenic hyphomycetes (II). Mycotaxon 55, 223–241.
Frank J, Crous PW, Groenewald JZ, Oertel B et al. 2010 – Microcyclospora and Microcyclosporella: novel genera accommodating epiphytic fungi causing sooty blotch on apple. Persoonia 24, 93–105.
Gunasinghe N, You M, Barbetti MJ. 2016 – Phenotypic and phylogenetic studies associated with the crucifer white leaf spot pathogen, Pseudocercosporella capsellae, in Western Australia. Plant Pathology 65, 205–217.
Ingram RJ, Levy F. 2020 – Identity and symptomatology of a newly described lily leaf spot disease (Pseudocercosporella inconspicua) of Gray’s lily (Lilium grayi). Canadian Journal of Plant Pathology 42, 499–507.
Lucas J, Dyer P, Murray T. 2000 – Pathogenicity, host-specificity, and population biology of Tapesia spp., causal agents of eyespot disease of cereals. Advances in Botanical Research 33, 225–258.
Nirenberg HI. 1981– Differenzierung der Erregcr der Halmbruchkrankheit. 1. Morphologie. Z. PflKrankh. Pf1Schucz 88, 241–248.
Robbertse B, Campbell G, Crous P. 1995 – Revision of Pseudocercosporella-like species causing eyespot disease of wheat. Mycological Research 61, 43–48.
Videira SIR, Groenewald JZ, Nakashima C, Braun U, Barreto RW, de Wit PJGM, Crous PW. 2017 – Mycosphaerellaceae - Chaos or clarity? Studies in Mycology 87, 257–421.
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