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Aureobasidium pollinicola Senwanna, Kodchasee, J. Kumla & N. Suwannar. sp. nov. Fig. 21 Etymology. Refers to its association with pollen, from which this species was isolated. Type. THAILAND • Chiang Mai Province, Mueang District, Chang Phueak, isolated from marguerite daisy flower (Argyranthemum frutescens; Asteraceae, Asterales), Jul 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, holotype = CMUB 40134 (preserved in metabolically inactive state), living culture (ex-type) = SDBR-CMU 861 = GMBCC 2510 = TBRC 21789. Cultural characteristics. After 14 days of incubation at 25 ° C in the dark, colonies on PDA reaching 50–55 mm diam., surface flat, spreading with entire margin, powdery, wrinkled, gradient from light to dark yellowish gray (4 B 2), with yellowish white (2 A 2) at the margin; on MEA reaching 40–46 mm diam., surface flat, powdery, spreading with entire margin, grayish yellow (4 B 4), with light gray (2 B 2) at the margin; on OA 42–47 mm diam., surface flat, powdery, wrinkled, spreading with entire margin, yellowish white (2 A 2), with light gray (2 B 2) at the margin. Description. Anamorph in vitro dematiaceous hyphomycetes. Vegetative hyphae (2.8 –) 3.5–8.0 (– 9.5) μm wide, hyaline to light brown, becoming dark brown melanized, branched, septate, smooth-, thin-walled, getting thicker, constricted at the septa with age. Conidiogenous cells (6.0 –) 10.0–16.0 (– 24.6) × (3.8 –) 4.0–5.7 μm (x ̄ = 13.0 × 4.6 μm, n = 25), undifferentiated, intercalary, terminal, producing conidia percurrently from indistinct, short lateral denticles, giving rise to conidia that aggregate in a mucoid mass, or differentiated on hyphae, hyaline to dark brown. Conidia fusoid, obovoid to ellipsoidal, or oval, or globose to subglobose, hyaline, becoming light brown to brown melanized, aseptate, occasionally with an indistinct truncated base and a hilum, guttulate, smooth-walled, (3.2 –) 6.0–9.4 (– 14.5) × (2.1 –) 3.3–5.5 (– 6.6) μm (x ̄ = 7.7 × 4.5 μm, n = 200), budding occasionally observed. Chlamydospores (6.8 –) 7.5–9.1 (– 10.2) μm wide (x ̄ = 8.3 μm, n = 25), produced in aerial hyphae, mostly intercalary, solitary or in branched chains, globose to subglobose, light to dark brown, smooth-, thick-walled, septate, 1–2 cells, constricted near the septa. Endoconidia (2.9 –) 5.5–7.5 (– 8.2) × (2.0 –) 2.3–3.8 (– 4.5) μm (x ̄ = 6.5 × 3.2 μm, n = 35), obovoid to ellipsoidal, hyaline, occasionally seen in intercalary hyphal cells. Fermentation of glucose is negative. D - glucose, galactose, sorbose, N - acetyl glucosamine, ribose, xylose, L - arabinose (weak), D - arabinose, L - rhamnose (weak), sucrose (weak), maltose, α - α - trehalose (weak), methyl- α - D - glucoside (weak), cellobiose (weak), salicin (weak), melibiose (weak), lactose, raffinose (weak), melizitose, glycerol, erythritol (weak), ribitol, glucitol, mannitol (weak), galactitol (weak), myo - inositol (weak), D - glucono- 1, 5 - lactone (weak), D - gluconate, D - glucuronate (weak), D - galacturonic acid, DL - lactate (weak), succinate, citrate, ethanol (weak), and xylitol (weak) are assimilated, but inulin, soluble starch, and methanol are not assimilated. Ammonium sulfate, ethylamine hydrochloride, L - lysine, cadaverine, and creatine are assimilated as sole nitrogen sources. Potassium nitrate and sodium nitrite are not assimilated. After 3 weeks, light brown sediment formed in D - xylose, erythritol, D - mannitol, galactitol, and myo - inositol. Black sediment formed in D - glucose, D - galactose, L - sorbose, N - acetyl glucosamine, D - ribose, L - arabinose, D- arabinose, L - rhamnose, sucrose, maltose, α - α - trehalose, methyl- α - D - glucoside, cellobiose, salicin, melibiose, lactose, raffinose, melizitose, glycerol, ribitol, D - glucitol, D - glucono- 1, 5 - lactone, D - gluconate, D - glucuronate, D - galacturonic acid, DL - lactate, succinate, citrate, ethanol, and xylitol. Cardinal temperatures for growth. Minimum 10 ° C, optimum in the range of 25 ° C to 30 ° C, maximum 37 ° C. No growth at 4 ° C. Additional strains examined. THAILAND • Phayao Province, Mueang District, isolated from frangipani flower (Plumeria obtusa; Apocynaceae, Gentianales), Aug 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, living culture = SDBR-CMU 810; isolated from vinca flower (Catharanthus roseus; Apocynaceae, Gentianales), Aug 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, living culture = SDBR-CMU 813 and SDBR-CMU 843. Habitat and distribution. Flowers of Argyranthemum frutescens, Catharanthus roseus, and Plumeria obtusa. Known only from northern Thailand. Notes. Phylogenetic analyses (Fig. 2) showed that A. pollinicola SDBR-CMU 810, SDBR-CMU 813, SDBR-CMU 843, and SDBR-CMU 861 (ex-type) formed a distinct monophyletic lineage with 100 % MLBS and 0.97 BIPP support that was sister to A. phayaoense. However, molecular sequence data, morphological and physiological characteristics, and PHI analyses clearly distinguished them as distinct species, as mentioned above. Therefore, A. pollinicola is described herein as a new species.
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ประเด็นที่เกี่ยวข้อง: Plant chemical constituents analysis · Plant Pathogens and Fungal Diseases · Sesquiterpenes and Asteraceae Studies
บทบาทของนักวิจัยและสถาบันไทย
Chanokned Senwanna · Pratthana Kodchasee · Chirayut Kathongthung · Milan C. Samarakoon · Pannida Khunnamwong · Jaturong Kumla · Nakarin Suwannarach · Chiang Mai University · Kasetsart University
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