Ascomycota, Pezizomycotina, Eurotiales, Trichocomaceae. Genus: TALAROMYCES
Talaromyces flavus (Klöcker) Stolk & Samson
Colony characteristics
Colonies (MEA, 7 d, 25°C) floccose, often sunken at the centre, with radial fissures, white, with yellow and red pigments, with yellow ascomata, mostly without sporulation, no exudate or soluble pigments produced; reverse greyish orange.
Microscopy
Hyphae hyaline. Conidiophores, when present monoverticillate; stipes smooth-walled, 15-20 μm long. Phialides acerose, in small whorls, 11-12 × 2.0-2.5 μm. Conidia smooth-walled, ellipsoidal, 2-3 × 1.5-2.5 μm. Ascomata more abundant at 30°C, deep yellow, (sub)spherical, 150-400 μm diam. Asci subspherical, evanescent. Ascospores broadly ellipsoidal, thick-walled, spiny, 4.0-5.5 × 3.0-3.5 μm.
Pathogenicity
RG-1, BSL-1. Sookto et al. (2022) described a fatal case of catheter-related peritonitis, possibly associated with use of the fungus as a biocontrol agent.
One Health
Soil fungus (Dethoup et al., 2007). Commercially used as a biocontrol agent because of its antagonistic potential against fungal plant pathogens such as Verticillium dahliae and Rhizoctonia solani (Marois et al., 1984; Gohel et al., 2006). It suppresses plant diseases on a wide variety of crop plants (Fahima & Henis, 1997; Naraghi et al., 2012), both in the field and in green houses (Naraghi et al., 2010). The species is an active producer of secondary metabolites (Proksa, 2010; Li et al., 2021).
References
Nomenclature
Gymnoascus flavus Klöcker – Hedwigia 41: 80, 1902 ≡ Talaromyces flavus (Klöcker) Stolk & Samson – Stud. Mycol. 2: 10, 1972; type strain: CBS 310.38 = IMI 197477 = NRRL 2098; ITS rDNA =JN899360; BenA = JX494302; CAL = KF741949; RPB1 = JN121639; RPB2 = JF417426.