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. 2022 Dec 16:10:e96642.
doi: 10.3897/BDJ.10.e96642. eCollection 2022.

Drechslerelladaliensis and D.xiaguanensis (Orbiliales, Orbiliaceae), two new nematode-trapping fungi from Yunnan, China

Fa Zhang  1   2   3 , Saranyaphat Boonmee  1   3 , Jutamart Monkai  1 , Xiao-Yan Yang  2   4   5 , Wen Xiao  2   4   5
Affiliations

Drechslerelladaliensis and D.xiaguanensis (Orbiliales, Orbiliaceae), two new nematode-trapping fungi from Yunnan, China

Fa Zhang et al. Biodivers Data J. .

Abstract

Background: Nematode-trapping fungi are a highly specialised group in fungi and are essential regulators of natural nematode populations. At present, more than 130 species have been discovered in Zygomycota (Zoopagaceae), Basidiomycota (Nematoctonus), and Ascomycota (Orbiliaceae). Amongst them, nematode-trapping fungi in Orbiliaceae have become the research focus of carnivorous fungi due to their abundant species. During the investigation of carnivorous fungi in Yunnan, China, four fungal strains isolated from burned forest soil were identified as two new nematode-trapping species in Drechslerella (Orbiliaceae), based on multigene phylogenetic analysis and morphological characters.

New information: Drechslerelladaliensis sp. nov. is characterised by its ellipsoid, 1-2-septate macroconidia, clavate or bottle-shaped, 0-1-septate microconidia and unbranched, simple conidiophores. D.xiaguanensis sp. nov. is characterised by fusiform or spindle-shaped, 2-4-septate conidia and unbranched, simple conidiophores. Both of them produce constricting rings to capture nematodes. The phylogenetic analysis, based on combined ITS, TEF1-α and RPB2 sequences, determined their placement in Drechslerella. D.daliensis forms a basal lineage closely nested with D.hainanensis (YMF1.03993). D.xiaguanensis forms a sister lineage with D.bembicodes (1.01429), D.aphrobrocha (YMF1.00119) and D.coelobrocha (FWY03-25-1).

Keywords: Orbiliaceae; carnivorous fungi; constricting rings; new species; taxonomy.

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Figures

Figure 1.
Figure 1.
Drechslerelladaliensis (holotype, CGMCC3.20131). a Culture colony; b, c Macroconidia; d Microconidia; e Constricting rings; f, g Conidiophores. Scale bars: a = 1 cm; b–g = 10 µm.
Figure 2.
Figure 2.
Drechslerellaxiaguanensis (holotype, CGMCC3.20132). a Culture colony; b, c Conidia; d Germinating conidia; e Constricting rings; f, g Conidiophore. Scale bars: a = 1 cm; b–g = 10 µm.
Figure 3.
Figure 3.
Maximum Likelihood tree, based on combined ITS, TEF1-α and RPB2 sequence data from 42 nematode-trapping taxa in Orbiliaceae. Bootstrap support values for Maximum Parsimony (red) and Maximum Likelihood (black) equal or greater than 50% and Bayesian posterior probabilities values (green) greater than 0.90 are indicated above the nodes. New isolates are in blue, ex-type strains are in bold.
See this image and copyright information in PMC

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