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Aureobasidium florigenum Senwanna, Kodchasee, J. Kumla & N. Suwannar. sp. nov. Fig. 13 Etymology. Refers to its origin from flowers, from which this species was isolated. Type. THAILAND • Chiang Mai Province, Mueang District, Suthep, isolated from marigold flower (Tagetes erecta; Asteraceae, Asterales), Aug 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, holotype = CMUB 40137 (preserved in metabolically inactive state), living culture (ex-type) = SDBR-CMU 865 = GMBCC 2512 = TBRC 21783. Cultural characteristics. After 14 days of incubation at 25 ° C in the dark, colonies on PDA reaching 35–50 mm diam., surface flat, spreading, round with radiating margin, velvety, dry, gray (5 C 1) at center, orange white (5 A 2), olive brown (4 E 5: tabby appearance); on MEA reaching 30–42 mm diam., surface flat, spreading, round with radiating margin, wrinkled, velvety, black, olive brown (4 E 5: tabby appearance); on OA 37–49 mm diam., surface flat, spreading with irregular margin, yellowish white (2 A 2), light gray (2 B 1: tabby appearance), with brownish gray (4 E 2) at the margin. Description. Anamorph in vitro dematiaceous hyphomycetes. Vegetative hyphae (2.7 –) 4.0–6.3 (– 10.0) μm wide, hyaline to brown, branched, septate, smooth, thin-walled, getting darker and thicker with age, constricted at the septa. Conidiophore-like structure differentiated on hyphae, (5.0 –) 7.0–10 (– 12.3) μm wide, hyaline to dark brown, branched, septate, smooth, thin-walled. Conidiogenous cells (5.0 –) 8.0–14.0 × 2.2–4.7 (– 5.8) μm (x ̄ = 10.1 × 4.1 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 becoming dark brown with age. Conidia ellipsoidal to dumbbell shaped, hyaline, becoming light to dark brown with age, aseptate, occasionally with an indistinct truncated base and a hilum, smooth-walled, guttulate, (4.1 –) 6.3–13.0 (– 19.2) × (2.2 –) 3.4–6.3 (– 10) μm (x ̄ = 9.1 × 4.8 μm, n = 300). Chlamydospores (7.4 –) 10.5–17.0 (x ̄ = 13.0 μm, n = 25) µm wide, produced in aerial hyphae, mostly intercalary, solitary or in branched chains, subglobose to ellipsoidal, dark brown, smooth-, thick-walled, septate, constricted near the septa. Endoconidia (4.5 –) 5.2–8.0 (– 9.3) × (3.2 –) 3.5–4.3 (– 4.9) μm (x ̄ = 6.7 × 4.1 μm, n = 25), 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, D - arabinose, L - rhamnose, sucrose, maltose, α - α - trehalose, methyl- α - D - glucoside, cellobiose, salicin, melibiose, lactose, raffinose, melizitose, glycerol, erythritol, ribitol, glucitol, mannitol, galactitol, myo - inositol, D - glucono- 1, 5 - lactone, D - gluconate (weak), D - glucuronate, D - galacturonic acid, DL - lactate, succinate, citrate, ethanol, and xylitol 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, dark brown sediment formed in D - glucose, methyl- α - D - glucoside, erythritol, myo - inositol, and D - glucuronate. Black sediment formed in L - sorbose, D - gluconate, and ethanol, while white sediment observed in D - galactose, D - ribose, D - xylose, L - arabinose, L - rhamnose, and galactitol. Cardinal temperatures for growth. Minimum 10 ° C, optimum in the range of 25 ° C to 30 ° C. No growth at 4 ° C and 37 ° C. Additional strains examined. THAILAND • Chiang Mai Province, Mueang District, Suthep, isolated from yellow elder flower (Tecoma stans; Bignoniaceae, Lamiales), Jul 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, living culture = SDBR-CMU 828. Habitat and distribution. Flowers of Tagetes erecta and Tecoma stans. Known only from northern Thailand. Notes. Phylogenetically, A. florigenum SDBR-CMU 865 (ex-type) and SDBR-CMU 828 formed a well-supported monophyletic lineage (100 % MLBS and 0.99 BIPP) that was sister to A. anthicola (Fig. 2). Furthermore, the PHI test confirmed the genetic distinctiveness of A. florigenum and A. anthicola (Fig. 4). The molecular, morphological, and physiological differences between A. florigenum and A. anthicola are described above. Therefore, A. florigenum is described herein as a new species.
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ประเด็นที่เกี่ยวข้อง: Plant Pathogens and Fungal Diseases · Biological and pharmacological studies of plants · Powdery Mildew Fungal Diseases
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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