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Aureobasidium saisamorniae Senwanna, Kodchasee, J. Kumla & N. Suwannar. sp. nov. Fig. 22 Etymology. Named in honor of Thai mycologist Saisamorn Lumyong in celebration of her 75 th birthday. Type. THAILAND • Phayao Province, Mueang District, isolated from butter daisy flower (Melampodium divaricatum; Asteraceae, Asterales), Jul 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, holotype = CMUB 40131 (preserved in metabolically inactive state), living culture (ex-type) = SDBR-CMU 848 = GMBCC 2505 = TBRC 21790. Cultural characteristics. After 14 days of incubation at 25 ° C in the dark, colonies on PDA reaching 39–41 mm diam., surface flat, spreading, round with slight raised margin, velvety, gradient from light to dark yellowish gray (4 B 2), with pale yellow (2 A 3) at the margin; on MEA reaching 45–59 mm diam., surface flat, spreading with filiform, entire margin, yellowish brown (5 E 8) at center, pale orange (6 A 3), with grayish yellow (4 B 4) at the margin; on OA 60–65 mm diam., surface flat, spreading with entire margin, yellowish white (2 A 2), with light gray (2 B 1) at the margin. Description. Anamorph in vitro dematiaceous hyphomycetes. Vegetative hyphae (2.5 –) 3.9–6.5 (– 10) μm wide, hyaline to dark brown, branched, septate, smooth, thin-walled, getting darker and thicker with age, constricted at the septa. Conidiogenous cells 8.3–10.6 (– 16.4) × 4.0–5.7 (– 9.6) μm (x ̄ = 10.4 × 5.7 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 (3.6 –) 5.4–8 (– 10.7) × 2.2–4.5 (– 5.7) μm (x ̄ = 6.5 × 3.5 μm, n = 200) µm, fusoid, obovoid to ellipsoidal, or subglobose, hyaline, becoming light brown to brown with age, aseptate, occasionally with an indistinct truncated base and a hilum, guttulate, smooth-walled. Chlamydospores (6.5 –) 7.2–13.5 (– 16.0) μm wide (x ̄ = 9.8 μm, n = 35), frequent produced in aerial hyphae, mostly intercalary, solitary, subglobose to ellipsoidal, pigmented, light to dark brown, smooth-, thick-walled, septate. Endoconidia (4.5 –) 5.2–7.0 (– 7.8) × (2.0 –) 2.5–3.7 (– 4.5) μm (x ̄ = 6.1 × 3.3 μm, n = 25), obovoid to ellipsoidal, hyaline, occasionally seen in intercalary hyphal cells. Fermentation of glucose is negative. D - glucose, galactose (weak), sorbose (weak), N - acetyl glucosamine, ribose, xylose, L - arabinose, D - arabinose (weak), L - rhamnose, sucrose, maltose, α - α - trehalose (weak), methyl- α - D - glucoside (weak), cellobiose, salicin, melibiose (weak), lactose, raffinose, melizitose, glycerol, erythritol, ribitol, glucitol, mannitol, galactitol (weak), myo - inositol, D - glucono- 1, 5 - lactone, D - gluconate (weak), D - glucuronate, D - galacturonic acid (weak), 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, black sediment formed in D - glucose, D - galactose, L - sorbose, N - acetyl glucosamine, D - ribose, D - 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, D - glucitol, D - mannitol, galactitol, myo - inositol, 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 Chinese ixora flower (Ixora chinensis; Rubiaceae, Gentianales), Aug 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, living culture = SDBR-CMU 846; isolated from holy basil flower (Ocimum tenuiflorum; Lamiaceae; Lamiales), Aug 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, living culture = SDBR-CMU 854. Habitat and distribution. Fowers of Ixora chinensis, Melampodium divaricatum, and Ocimum tenuiflorum. Known only from northern Thailand. Notes. The multilocus phylogenetic tree (Fig. 2) indicated that A. saisamorniae strains SDBR-CMU 846, SDBR-CMU 848 (ex-type), and SDBR-CMU 854 formed a well-supported monophyletic lineage (100 % MLBS and 0.95 BIPP) and were sister to A. savitreeae (72 % MLBS and 0.94 BIPP). The ITS and LSU sequences of A. saisamorniae showed 100 % similarity to those of A. savitreeae, whereas the rpb 2, tef 1, and tub sequences exhibited similarities of 99.90 %, 94.74 %, and 99.75 %, respectively. A comparison of nucleotides in the tef 1 sequence showed that A. saisamorniae differed by 5.3 % (15 / 285 bp, including gaps). Morphologically, colonies of A. saisamorniae on MEA were pale orange to yellowish brown at the center with a grayish-yellow margin, and those on OA were yellowish white with a light-gray margin, whereas colonies of A. savitreeae on MEA were orange white, and those on OA were pale yellow with a light brownish-gray margin. In terms of growth temperature, A. saisamorniae was capable of growing at 37 ° C, whereas A. savitreeae was unable to grow at this temperature. Furthermore, the PHI test supported the genetic distinctiveness of A. saisamorniae and A. savitreeae (Fig. 3), indicating that they represent different species. Physiologically, A. saisamorniae produced a black sediment during carbon assimilation, whereas A. savitreeae produced brown sediment (Table 1). In addition, A. savitreeae is characterized by the production of light pink pigmentation on D - glucose, D - xylose, erythritol, L - arabinose, melezitose, raffinose, and sucrose, whereas A. saisamorniae does not produce pigmentation (Table 1). Thus, A. saisamorniae was introduced as a new species.
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ประเด็นที่เกี่ยวข้อง: Plant Pathogens and Fungal Diseases · Plant chemical constituents analysis · Mycorrhizal Fungi and Plant Interactions
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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