Diaporthe ganzhouensis C.M. Tian & Q. Yang, 2021

Yang, Qin, Jiang, Ning & Tian, Cheng-Ming, 2021, New species and records of Diaporthe from Jiangxi Province, China, MycoKeys 77, pp. 41-64 : 41

Diaporthe ganzhouensis C.M. Tian & Q. Yang sp. nov. Figure 5

Diagnosis.

Distinguished from the phylogenetically closely-related species D. vawdreyi in having longer conidiophores and wider alpha conidia.

Etymology.

Named after Ganzhou City where the species was first collected.

Description.

On PDA: Conidiomata pycnidial, subglobose, solitary, deeply embedded in the medium, erumpent, dark brown to black. Pale yellow conidial drops exuding from ostioles. Conidiophores (12-)15.5-21 × 1.5-2 μm, cylindrical, hyaline, phiailidic, branched, straight or slightly curved. Alpha conidia 6.5-8.5(-9) × 2-2.5(-3) μm, aseptate, hyaline, ellipsoidal to fusiform, rounded at one end, slightly apex at the other end, biguttulate. Beta conidia hyaline, aseptate, filiform, sinuous at one end, eguttulate, (21.5-)25.5-31(-33) × 1 µm.

Culture characters.

Colony at first white, becoming yellowish with age. Aerial mycelium white, dense, fluffy, with visible solitary conidiomata at maturity.

Specimens examined.

China. Jiangxi Province: Ganzhou City, unknown dead wood, 25°45'17"N, 115°00'41"E, 23 Jul 2018, Q. Yang, Y. Liu, Y.M. Liang & C.M. Tian (holotype BJFC-C004; ex-type culture: CFCC 53087; living culture: CFCC 53088).

Notes.

Diaporthe ganzhouensis comprises the isolates CFCC 53087 and CFCC 53088, revealed to be closely related to D. vawdreyi in the combined phylogenetic tree (Fig. 1 ). Diaporthe ganzhouensis can be distinguished, based on ITS, tef1-α and tub2 loci from D. vawdreyi (6/456 in ITS, 63/357 in tef1-α and 40/469 in tub2). Diaporthe ganzhouensis differs morphologically from D. vawdreyi in having longer conidiopores (15.5-21 vs. 6-15 μm) and wider alpha conidia (2-2.5 vs. 1.5-2 μm) ( Crous et al. 2015).

Figures

Figure 1. Phylogram of Diaporthe from a Maximum Likelihood analysis based on combined ITS, cal, his 3, tef 1 and tub 2. Values above the branches indicate Maximum Likelihood bootstrap (left, ML BP ≥ 50 %) and Bayesian probabilities (right, BI PP ≥ 0.90). The tree is rooted with Diaporthella corylina. Strains in current study are in blue font and the ex-type cultures are in bold font.

Figure 5. Diaporthe ganzhouensis on unknown host (BJFC-S 1678) a the colony on PDA and conidiomata b alpha and beta conidia c conidiogenous cells and alpha conidia. Scale bars: 10 μm (b, c).