Dothideales » Saccotheciaceae » Pseudoseptoria

Pseudoseptoria donacicola

Pseudoseptoria donacicola Speg., Anal. Mus. nac. B. Aires, Ser. 3 13: 388 (1910) [1911].

           Index Fungorum number: IF 212433; Facesoffungi number: FoF 00135, Fig. 1

Description:

Associated with black spots on infected area. Sexual morph: Unknown. Asexual morph: Conidiomata 90–95 μm diam., 70–75 μm high, pycnidial, semi-immersed to superficial, separate or aggregated, globose, papillate, brown. Peridium 8–10 μm, comprising pale brown textura angularis, inner layer of flattened, hyaline textura angularis, somewhat darker and more thick-walled around the ostiole. Ostiole 15–18 μm, single, circular, central. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 4.4–4.5 × 1.5–2.0 μm (x̄ = 4.42 × 1.7 µm, n = 10), holoblastic, either determinate or indeterminate, proliferating sympodially or percurrently, hyaline, smooth, ampulliform, dolliform or lageniform to short cylindrical. Conidia 14–18 × 2.7–3.8 μm (x̄ = 15.8 × 2.9 µm, n = 10), hyaline, fusoid, straight or slightly curved, smooth, continuous.

Material examined: Hungary, Pozsony, on leaves of Arundo donax (Poaceae), J.A. Baeumler (BISH 610357).

Fig. 1 Pseudoseptoria donacicola (BISH 610357, under the name Septoria oxyspora). a, b Herbarium material. c, d Appearance of conidiomata on host surface. e, f Section through conidioma. g Peridium. h Conidiogenesis. i–k Conidia. Scale bars: d = 1000 μm, e–h, j, k = 20 μm, i = 50 μm

Importance and distribution

Species of Pseudoseptoria are pathogenic infecting economic crops such as barley, rye and wheat causing halo spot disease which can affect the photosynthetic ability of the plants leading to reduced yields. Pseudoseptoria comprises eight species known on a wide range of grass hosts including Alopecurus pratensis, Arctophila fulva, Arrhenatherum elatius, Arundo donax, Bromus carinatus, Cynosurus cristatus, Dactylis glomerata, Danthonia spicata, Deschampsia caespitosa, Elymus alaskanus, Elytrigia repens, Festuca rubra, Hordeum sp., Panicum virgatum, Phleum phleoides, Poa, Puccinellia hauptiana and Triodia decumbens. Pseudoseptoria is specific to Poaceae and widely distributed in Asia (India, Russia), Australia, Europe (Italy Poland, United Kingdom), New Zealand, North America (Canada, the United States).

 

Quarantine significance

Pseudoseptoria is of quarantine importance as it causes halo spot of barley, rye, wheat and stem speckle (Slopek and Labun 1992).

 

References

Crous PW, Wingfield MJ, Burgess TI, Hardy GESTJ et al. 2017 – Fungal planet description sheets: 558–624. Persoonia 38, 240–384.

Liu JK, Hyde KD, Jones EBG, Ariyawansa HA et al. 2015 – Fungal diversity notes 1–110: taxonomic and phylogenetic contributions to fungal species. Fungal Diversity 72, 1–197.

Quaedvlieg W, Verkley GJM, Shin HD, Barreto RW et al. 2013 – Sizing up Septoria. Studies in Mycology 75, 307–390.

Slopekl S, Labun T. 1992 – First report of halo spot of barley caused by Pseudoseptoria stomaticola in Alberta. Canadian Plant Disease Survey 72, 1.

Sutton BC. 1980 – The Coelomycetes. Fungi imperfecti with pycnidia, acervuli and stromata. Commonwealth Mycological Institute, Kew, pp 1–696.

Wijayawardene DNN, McKenzie EHC, Hyde KD. 2012 – Towards incorporating anamorphic fungi in a natural classification—checklist and notes for 2011. Mycosphere 3,157–228.

 

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