Diaporthe jinxiu X.H. Wang & G.P. Wang, 2021

Wang, Xianhong, Guo, Yashuang, Du, Yamin, Yang, Ziling, Huang, Xinzhong, Hong, Ni, Xu, Wenxing & Wang, Guoping, 2021, Characterization of Diaporthe species associated with peach constriction canker, with two novel species from China, MycoKeys 80, pp. 77-90 : 77

Diaporthe jinxiu X.H. Wang & G.P. Wang sp. nov. Fig. 3

Etymology.

Named for the host variety ( Prunus persica cv. Jinxiu), from which the species was isolated.

Description.

Sexual morph: not observed. Asexual morph on alfalfa stems after 15 days. Pycnidial conidiomata small, covered by pale yellow discharged conidial masses at maturity, 385-810 μm diam. Conidiophore hyaline, cylindrical, smooth, phialidic, unbranched, straight or slightly curved, 16-21 × 2-2.5 μm. Conidiogenous cells phialidic, cylindrical. Alpha conidia hyaline, aseptate, ellipsoidal, biguttulate, rounded at each end, 5.8-7.1 × 2.7-4.0 µm (mean = 6.4 ± 0.4 × 3.5 ± 0.3 μm, n = 50). Beta and gamma conidia not observed.

Culture characteristics. Cultures incubated on PDA at 25 °C in cycle of light/darkness, growth rate 11.5 mm per day. On PDA medium, colonies were sparse and villous, flourishing at edge of colony. On OA medium, colonies dense with neat edges, with yellow pigment in the center.

Materials examined.

China, Fujian Province, Sanming City, on buds of Prunus persica cv. Zaofenghuang , 23 March 2017, Y. S. Guo (holotype HMAS 249837, culture ex-holotype culture CGMCC3.20269 = TZFH20) ; ibid., ex-isotype culture TZFH25 .

Notes.

In the phylogenetic, multi-locus tree, D. jinxiu forms a distinct clade with maximum support (1/100/99) and is most closely related to D. rhoina , but with smaller pycnidial conidiomata than the later ( D. jinxiu = 386-807 μm vs D. rhoina = 500-2500 μm) ( Feltgen 1901). Moreover, the sequence differences were significant, and all five regions were able to distinguish them (28/578 in ITS, 38/382 in TEF, 21/509 in CAL, 28/520 in HIS, and 11/525 in TUB).

Figures

Figure 3. Diaporthe jinxiu. Front and back views of colonies on PDA (A, B) and OA (C, D), respectively E conidiomata on alfalfa stems F conidioma G conidiophores H alpha conidia I-J section view of conidioma. Scale bars: 2 mm (E); 200 μm (F); 20 μm (I); 10 μm (G, H, J).