Alternaria poae H. F. Liu & J. X. Deng, 2025

Liu, Hai-Feng, Liu, Feng-Yin, Ke, Hai-Yan, Shi, Qing-Xiao, Deng, Jian-Xin & Sang, Hyunkyu, 2025, Three novel species of Alternaria (Pleosporales, Pleosporaceae) from cereal crops (Poaceae) in China, MycoKeys 116, pp. 167-183 : 167-183

Alternaria poae H. F. Liu & J. X. Deng sp. nov.

Fig. 3

Etymology.

Name refers to its host family Poaceae .

Type.

China • Hainan Province, Lingshui County, diseased leaves of Oryza sativa , July 2023, J. L. Yin, holotype YZU-H-2023056 B (permanently preserved in a metabolically inactive state), ex-type culture YZU 231197 .

Description.

On PDA, colonies sub-rounded, fluffy, cottony, white to pale green or yellow-green, reverse side pale yellow to light yellow, 55–56 mm in diameter (Fig. 3 a ). On PCA, conidiophores unbranched, curved or straight, 15–77 × 3–4 μm in size, with 1–5 septa (Fig. 3 f ). Conidiogenous cells 5–9 × 3–4 μm, integrated, terminal, cylindrical, thin-walled, smooth, apically doliiform, with 1 conidiogenous locus. Conidia borne single or in chain with at least 2–4 conidia per chain, unbranched, narrow-ovoid, subellipsoid, or obclavate, smooth, 20–42 × 10–19 μm, with 1–4 transverse septa. basal rounded, apical beak 6–26 × 3–4 μm (Fig. 3 b, c, g ). On V 8 A, conidiophores unbranched, smooth, 30–96 × 3–4 μm, with 2–7 septa. Conidia produced in chain with at least 2–4 conidia per chain, subellipsoid, obclavate, or narrow-ovoid, 20–45 × 10–17 μm, 1–4 transverse septa, beak 5–17 × 3–4 μm (Fig. 3 d, e, h ).

Additional isolated examined.

China • Hainan Province, Lingshui County, diseased leaves of Oryza sativa , July 2023, J. L. Yin, living culture YZU 231198 .

Notes.

In phylogenetic analysis using concatenated sequences of ITS, GAPDH, RPB 2, TEF 1, Alt a 1, EndoPG, and OPA 10-2, strains of Alternaria poae ( YZU 231197 and YZU 231198 ) fell into a separate clade close to clades of A. zeae and A. burnsii . Based on nucleotide sequences, A. poae differs from A. zeae in five loci (3 bp in GAPDH with 1 gap, 5 bp in RPB 2, 3 bp in TEF 1, 3 bp in Alt a 1, and 7 bp in OPA 10-2), and differs from A. burnsii in six loci (2 bp in GAPDH, 2 bp in RPB 2, 3 bp in TEF 1, 2 bp in Alt a 1, 2 bp in EndoPG, and 4 bp in OPA 10-2). In morphology, A. poae can be distinguished from A. zeae by its shorter beak length, and from A. burnsii by its wider conidia bodies (Table 2 ).

Figures

Figure 3. Morphology of Alternaria poae sp. nov. (YZU 231197) a colony on PDA for 7 days at 25 ° C b, c sporulation on PCA d, e sporulation on V 8 A f conidiophore and conidiogenous cell g conidia on PCA h conidia on V 8 A. Scale bars: 50 µm (b, c, d, e); 15 µm (f); 25 µm (g, h).