Sporidesmiella lignicola sp. nov., a new hyphomycetous fungus from freshwater habitats in China

Xiao-Hong Li; Yu-Lin Liu; Hai-Yan Song; Dian-Ming Hu; Yang Gao; Hai-Jing Hu; Jian-Ping Zhou

doi:10.3897/BDJ.9.e77414

Biodiversity Data Journal : Taxonomic Paper

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Taxonomic Paper

Sporidesmiella lignicola sp. nov., a new hyphomycetous fungus from freshwater habitats in China

Xiao-Hong Li^‡, Yu-Lin Liu^§, Hai-Yan Song^|, Dian-Ming Hu^‡,¶, Yang Gao^‡, Hai-Jing Hu^‡, Jian-Ping Zhou^‡

‡ Bioengineering and Technological Research Centre for Edible and Medicinal Fungi, Jiangxi Agricultural University, Nanchang, China

§ Jiangxi Environmental Engineering Vocational College, Ganzhou, China

| Key Laboratory of Crop Physiology, Ecology and Genetic Breeding (Jiangxi Agricultural University), Ministry of Education of the P.R. China, Nanchang, China

¶ College of Bioscience and Bioengineering, Jiangxi Agricultural University, Nanchang, China

Corresponding author: Dian-Ming Hu (hudianming1@163.com)

Academic editor: Ning Jiang

Received: 01 Nov 2021 | Accepted: 03 Dec 2021 | Published: 15 Dec 2021

This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Citation: Li X-H, Liu Y-L, Song H-Y, Hu D-M, Gao Y, Hu H-J, Zhou J-P (2021) Sporidesmiella lignicola sp. nov., a new hyphomycetous fungus from freshwater habitats in China. Biodiversity Data Journal 9: e77414. https://doi.org/10.3897/BDJ.9.e77414

Abstract

Background

Freshwater fungi, growing on submerged wood, can promote the degradation of organisms and the reuse of rotten wood energy and play key roles in freshwater ecosystems. Here, a new hyphomycetous fungus, Sporidesmiella lignicola, was isolated and identified from submerged wood samples collected in a small stream in Jiangxi Province, south-eastern China.

New information

The new taxon was studied, based on morphological characters and phylogenetic analyses combined with LSU, ITS, TEF1α and RPB2 sequences data. Sporidesmiella lignicola was morphologically characterised by its pink colonies on PDA medium in prophase, macronematous, mononematous, solitary, brown, septate, unbranched, straight or slightly flexuous conidiophores with holoblastic, polyblastic, integrated, terminal, pale brown conidiogenous cells and cylindrical, narrowly clavate, broadly obovoid to cuneiform, 3–4-distoseptate, olivaceous brown or brown conidia with rounded apex. A phylogenetic tree was constructed, based on the combination of LSU, ITS, TEF1α and RPB2 sequences data.

Keywords

freshwater fungi, lignicolous fungi, hyphomycetes, taxonomy

Introduction

The genus Sporidesmiella was introduced by Kirk to accommodate two newly-described species and four new combinations from Sporidesmium, with Sporidesmiella claviformis as the type species (Kirk 1982). Sporidesmiella was commonly characterised by having clavate or obovoid to cuneate conidia, with a few distosepta, rounded or coronate at the apex, seceding schizolytically from monoblastic, integrated, terminal, annellidic or rarely sympodially extending conidiogenous cells. Ma et al. (2012) revised Sporidesmiella and accepted 26 species, based on the characters of proliferations of conidiogenous cells and conidial shape, size range and septation. Subsequently, 12 additional taxa have been added to Sporidesmiella, based on morphological characters, i.e. S. curtiphora (Monteiro et al. 2014), S. bawanglingensis and S. nanlingensis (Ma et al. 2015), S. mammillata (Heredia et al. 2015), S. physconiicola (Zhurbenko et al. 2015), S. guangdongensis and S. jiangxiensis (Ma 2016a), S. lushanensis and S. jiulianshanensis (Ma 2016b), S. novae-zelandiae (Hernández-Restrepo et al. 2018), S. corniformis (Ai et al. 2019) and S. suttonii (Kirk 2019). Recently, Luo et al. (2019) introduced a new species S. aquatica from freshwater habitats. Dong et al. (2021) reported a new species S. obovioidia from submerged wood. Up to now, 40 species have been accepted in Sporidesmiella.

So far, the molecular data of Sporidesmiella are relatively few; there are DNA sequences of only five species deposited in NCBI, i.e. S. aquatic, S. fusiformis, S. hyalosperma, S. novae-zelandiae and S. obovoidia. Therefore, most Sporidesmiella species have not been subjected to molecular phylogenetic analysis. Shenoy et al. (2006) classified Sporidesmiella fusiformis in the Melanommataceae according to the phylogenies with the combined LSU nu-rDNA and RPB2 dataset. Luo et al. (2019), Crous et al. (2020) and Dong et al. (2021) accommodated S. aquatic, S. hyalosperma, S. novae-zelandiae and S. obovoidia within Junewangiaceae, based on the combination of LSU, ITS, TEF1α and RPB2 sequences data. Therefore, as Sporidesmiella was suspected to be polyphyletic, the molecular data of the type species S. claviformis are in need of analysis.

Based on investigations of freshwater fungi in Jiangxi Province (Hu et al. 2012a, Huang et al. 2016, Hu et al. 2016, Song et al. 2018, Song et al. 2020), we reported a new species of Sporidesmiella, collected on submerged wood from freshwater habitats in Jiangxi Province. It was described and illustrated as Sporidesmiella lignicola, based on phylogenetic evidence of combined LSU, ITS, TEF1α and RPB2 sequence data and morphological characters.

Materials and methods

Samples collection

Submerged wood samples were collected randomly from a stream in Xinfeng County, Ganzhou City, Jiangxi Province, China. The samples were taken to the laboratory in zip-lock bags and incubated in moist plastic boxes.

Specimen examination

Fruiting bodies or colonies were examined following the method of Hu et al. (2012a) using a Nikon dissecting microscope. Samples were examined and photographed using a Nikon (Ni) compound microscope with differential interference contrast (DIC) (Hu et al. 2016). The fungal specimens were deposited in the Herbarium of Fungi, Jiangxi Agricultural University (HFJAU), Nanchang, China.

Single spore isolation and cultivation

The fungal colonies on the rotten wood were picked up and placed in 200 μl sterile water to make a suspension, then the suspension was evenly spotted on potato dextrose agar (PDA), then cultured in a 28℃ incubator. The spore germination was observed every 12 hours and recorded. The germinating single spore was transfered to new PDA medium with a sterile needle under aseptic conditions and then cultured in a 28℃ incubator to obtain the pure strain.

DNA extraction, PCR amplification and sequencing

DNA was extracted from the pure cultures with the CTAB method, following Doyle and Doyle (1987). Four gene regions, LSU, ITS, TEF1α and RPB2 were amplified using the primer pairs LR0R/LR5, ITS1/ITS4, EF1-983F/EF1-2218R and RPB2-5F/RPB2-7cR, respectively (Vilgalys and Hester 1990, White et al. 1990, Liu et al. 1999). The amplification was performed following the method described by Hu et al. (2012b). The PCR products were examined using 1% agarose electrophoresis gels, stained with GelRed and purified and sequenced with the same primers at Tsingke Biotechnology Co. Ltd.

Phylogenetic analyses

Four novel sequences (OK091615, MZ613187, OK323223, OK323222) from the new taxon, together with reference sequences obtained from GenBank (Table 1), were aligned with MAFFT version 7 (https://mafft.cbrc.jp/alignment/software/, Katoh and Standley 2013). The ML analyses were conducted with RAxML v. 7.2.6 (Stamatakis and Alachiotis 2010), using a GTRGAMMA substitution model with 1000 bootstrap replicates. The robustness of the analyses was evaluated by bootstrap support (MLBS).

Table 1.

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Taxa used in this study and their GenBank accession numbers. Ex-type strains are in bold; newly-generated sequences are highlighted with underline.

Abbreviation: MFLU: the Herbarium of Mae Fah Luang University, Chiang Rai, Thailand; MFLUCC: Mae Fah Luang University Culture Collection, Chiang Rai, Thailand; HFJAU: Herbarium of Fungi, Jiangxi Agricultural University, Nanchang, China; CBS: Centraalbureau voor Schimmelcultures, Utrecht, The Netherlands; HSAUP: Herbarium of Department of Plant Pathology, Shandong Agricultural University, Taian, China; HMAS: Mycological Herbarium, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China; Dali University Culture Collection, Yunnan, China; JAUCC: Jiangxi Agricultural University Culture Collection, Nanchang, China. KUMCC: Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China; CPC: Culture collection of Pedro Crous, housed at CBS.

Taxon	Voucher/Culture	GenBank accession numbers
Taxon	Voucher/Culture	LSU	ITS	TEF1α	RPB2
*Botryotinia fuckeliana*	AFTOL-ID 59^T	AY544651	DQ491491	DQ471045	DQ247786
*Dictyosporella aquatica*	CBS H-22127^T	KT241022	_	_	_
*Dictyosporella chiangmaiensis*	MFLUCC 17-2345^T	MW287765	MW286491	_	_
*Dictyosporella ellipsoidea*	MFLUCC 18-1042^T	MW287758	_	_	_
*Dictyosporella guizhouensis*	MFLU 18-1505^T	MK593605	MK593606	_	_
Dictyosporella guizhouensis	MFLUCC 18-1232	MW287760	MW286487	MW396646	_
*Dictyosporella hydei*	IFRDCC 3075^T	MG813161	_	_	_
*Dictyosporella thailandensis*	MFLUCC 15-0985^T	MF374364	MF374355	MF370958	MF370952
*Junewangia aquatic*	HFJAU 0700^T	MG213737	MG213738	_	_
Junewangia globulosa	CBS 126093	MH875535	MH864078	_	_
Junewangia lamma	HSAUPH 4695	KU751883	KU999971	_	_
Junewangia lamma	HMAS 44438	KU751882	KU999961	_	_
Junewangia queenslandica	HSAUPmyr 7722	KX033575	KU999984	_	_
Junewangia sphaerospora	HSAUPmyr 4733	KX033572	KU999981	_	_
*Junewangia thailandica*	MFLU 15-2682^T	MW287762	_	_	_
Sporidesmiella aquatica	DLUCC 1339	MK849844	_	MN194035	MN124524
*Sporidesmiella aquatic*	DLUCC 0777^T	MK849843	MK828692	MN194034	_
Sporidesmiella hyalosperma	DLUCC 1518	MK849842	MK828691	MN194033	MN124523
Sporidesmiella hyalosperma	KUMCC 15-0431	MK849841	MK828690	MN194032	MN124522
Sporidesmiella hyalosperma	S-1320	MK849840	MK828689	_	MN124521
Sporidesmiella hyalosperma	MFLUCC 18-1312	MK849839	MK828688	MN194031	MN124520
Sporidesmiella hyalosperma	MFLUCC 18-1013	MW287773	MW286499	MW396654	MW504070
*Sporidesmiella lignicola*	JAUCC 3436^T	OK091615	MZ613187	OK323223	OK323222
Sporidesmiella novae-zelandiae	DLUCC 0951	MK849847	MK828695	MN194037	MN124526
Sporidesmiella novae-zelandiae	S-048	MK849846	MK828694	_	_
Sporidesmiella novae-zelandiae	DLUCC 1256	MK849845	MK828693	MN194036	MN124525
*Sporidesmiella obovoidia*	MFLUCC 17-2372^T	MW287766	MW286492	_	_
*Sporidesmium appendiculatum*	MFLU 18-0981^T	MW287774	MW286500	_	_
*Sporidesmium chiangmaiense*	MFLUCC 18-0999^T	MW287771	MW286497	_	_
*Sporidesmium dulongense*	MFLUCC 17-0116^T	MH795817	MH795812	MH801191	MH801190
*Sporidesmium lageniforme*	DLUCC 0880^T	MK849782	MK828640	MN194044	MN124533
Sporidesmium melaleucae	CPC 32936	MH327854	MH327818	_	_
*Sporidesmium melaleucae*	CPC 32707^T	MH327853	MH327817	_	_
Sporidesmium pyriformatum	MFLUCC 15-0627	KX710143	KX710148	MF135663	MF135650
*Sporidesmium pyriformatum*	MFLUCC 15-0620^T	KX710141	KX710146	MF135662	MF135649

The multilocus sequences were concatenated with PhyloSuite v. 1.2.2 (Zhang et al. 2020). The concatenated aligned datasets were analysed separately using Maximum Likelihood (ML) and Bayesian Inference (BI). ModelFinder (Kalyaanamoorthy et al. 2017) was used to select the best-fit model using AICc criterion. The best-fit model according to AICc was GTR+F+I+G4. Bayesian Inference phylogenies were inferred using MrBayes 3.2.6 (Ronquist et al. 2012) under partition model (2 parallel runs, 2,000,000 generations), in which the initial 25% of sampled data were discarded as burn-in. Modification of the final phylogenetic tree was done in FigTree v. 1.4.3 and Adobe Illustrator CS6.

Taxon treatment

Sporidesmiella lignicola X.H. Li, H.Y. Song & D.M. Hu, sp. nov.

MycoBank 841439

Material Download as CSV

Holotype:

scientificName:
Sporidesmiella lignicola
; acceptedNameUsage:
Sporidesmiella lignicola X.H. Li, H.Y. Song & D.M. Hu, 2021, sp. nov.
; taxonID:
urn:lsid:biosci.ohio-state.edu:osuc_names:275502
; parentNameUsage:
Sporidesmiella P.M. Kirk 1982
; kingdom:
Fungi
; phylum:
Ascomycota
; class:
Dothideomycetes
; order:
Pleosporales
; family:
Junewangiaceae
; taxonRank:
species
; verbatimTaxonRank:
species
; genus:
Sporidesmiella
; specificEpithet:
lignicola
; scientificNameAuthorship:
X.H. Li, H.Y. Song & D.M. Hu
; continent:
Asia
; country:
China
; stateProvince:
Jiangxi
; county:
Xinfeng
; municipality:
Ji'an
; locality:
Jinji Forest Farm
; verbatimElevation:
305 m
; locationRemarks:
label transliteration: "Jiangxi, Jinji Forest Farm, 2020.7.7, Li Xiao-Hong"; [江西赣州市信丰县金鸡林场，2020年7月7日，李小红]
; verbatimCoordinates:
25.4732 N, 115.2048 E
; decimalLatitude:
25.4732
; decimalLongitude:
115.2048
; georeferenceProtocol:
label
; samplingProtocol:
collecting
; eventDate:
07/07/2021
; habitat:
Freshwater
; individualCount:
1
; recordedBy:
Xiao-Hong Li
; identifiedBy:
Xiao-Hong Li and Dian-Ming Hu
; dateIdentified:
2020
; type:
PhysicalObject
; language:
en
; rightsHolder:
Dian-Ming Hu
; institutionID:
HFJAU 10001 (Dried culture with conidia)
; collectionID:
FF019
; institutionCode:
the Herbarium of Fungi, Jiangxi Agricultural University (HFJAU)
; collectionCode:
Fungi
; ownerInstitutionCode:
the Herbarium of Fungi, Jiangxi Agricultural University (HFJAU)
; basisOfRecord:
PreservedSpecimen

Description

Saprobic on decaying wood submerged in freshwater habitats. Colonies effuse, hairy, pale brown. Mycelium mostly superficial, partly immersed, consisting of unbranched, septate, smooth, thick-walled, brown to dark brown hyphae. Sexual morph: Undetermined. Asexual morph: Conidiophores 110–150 × 3–7 μm (mean = 124.6 × 4.2, n = 20), macronematous, mononematous, solitary, pale brown, smooth at the bottom and verrucose at the apex, septate, unbranched, straight or slightly flexuous. Conidiogenous cells 15–26 × 2–5 μm (mean = 22.4 × 4, n = 20), holoblastic, polyblastic, integrated, terminal, pale brown, cylindrical. Conidia 18–26 × 7–11 μm (mean = 21 × 8.9, n = 20), acrogenous, dry, cylindrical, narrowly clavate, obovoid to broadly obovoid to cuneiform, truncate at the base, rounded or rarely coronate at the apex, 2–3-distoseptate, pale olivaceous to olivaceous brown or brown, smooth. Conidial session schizolytic (Fig. 1).

Figure 1.

Sporidesmiella lignicola (HFJAU 10001, Holotype) a Colony on wood; b, c Conidiophores; d Conidiophores with production of conidia; e–g Conidia; h, i Colony on PDA for 21 days (left-front, right-reverse). Scale bars: a = 125 µm, b–c = 12.5 µm, d–g = 10 µm, h–i = 1.5 cm.

Culture characteristics: On PDA, colony reaching 12 mm in 21 days at 28°C, pink from above, pink-grey from below, surface rough, dry, with loose mycelium and irregular edge. After half a year, the colony produces spores. The hyphae penetrate into the PDA medium, the surface colour becomes brown to dark brown, raised with white in the middle, reverse of culture pale brown to dark brown, with entire and regular edge. Mycelium composed of septate, pale brown, unbranched, smooth hyphae. Conidiophores macronematous, solitary, cylindrical, straight or slightly flexuous, septate, brown, smooth, thick-walled, 37–54 × 3.5–5.5 μm (mean = 46.5 × 4.6, n = 20). Conidiogenous cells holoblastic, polyblastic, integrated, terminal, pale brown, cylindrical, 10–26 × 3–7 μm (mean = 27.1 × 4.6, n = 20), slightly enlarged towards the apex. Conidia acrogenous, cylindrical, broadly obovoid to cuneiform, truncate at the base, rounded at the apex, 3–4-distoseptate, brown to pale olivaceous brown, smooth, 18–28 × 8–12 μm (mean = 22.3 × 9.6, n = 20) (Fig. 2).

Figure 2.

a–b, e Conidiophores with production of conidia; c–d Conidiophores; f–i Conidia; j Colony on PDA after 6 months (left-front, right-reverse). Scale bars: a–d = 25 µm, e–i = 10 µm, d–g = 10 µm.

Etymology

The specific epithet “lignicola” (Latin) meaning ‘‘growing on wood’’.

Ecology

Saprophyte on wood submerged in a small stream.

Notes

Sporidesmiella lignicola is characterised by being cylindrical, broadly obovoid to cuneiform, truncate at the base, rounded at the apex, 3–4-distoseptate, pale olivaceous brown to brown, smooth, which is consistent with the characteristics of Sporidesmiella. Sporidesmiella lignicola is similar to S. obovoidia and S. hyalosperma in having polyblastic conidiogenous cells and obovoid, 3–4-distoseptate, brown conidia (Luo et al. 2019, Dong et al. 2021). However, S. lignicola differs from other species in having longer and verrucose conidiophores (Table 2). In addition, the colonies of S. lignicola are pink from above, pink-grey from below, characteristics which were not observed in the other two species (Fig. 3, Table 2).

Table 2.

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Comparisons of Sporidesmiella lignicola and similar species.

Species	Conidiophores (µm)	Conidiogenous cell (µm)	Conidia			Colour of cultures	References
Species	Conidiophores (µm)	Conidiogenous cell (µm)	Shape	Colour	Size (µm)	Colour of cultures	References
S. hyalosperma	Smooth, 90–110 × 3.5–4.7	35–48 × 4–4.5	obovoid or broadly clavate	olivaceous brown	18.5–25 × 8–10.5	reddish-brown from above and below	Dong et al. 2021
*S. lignicola*	Verrucose at the apex, 110–150 × 3–7	15–26 × 2–5	broadly obovoid to cuneiform	brown or olivaceous brown	18–26 × 7–11	pink from above, pink-grey from below	This paper
S. obovoidia	Smooth, 80–125 × 3.5–4.5	10–40 × 3–4	mostly obovoid or broadly clavate	brown or olivaceous brown	20–25 × 9–11.5	grey-dark brown from above, black from below	Dong et al. 2021

Figure 3.

Comparisons of colonies on PDA (left-front, right-reverse) in Sporidesmiella lignicola and similar species. a S. hyalosperma; b S. obovoidia; c S. lignicola.

Based on a BLAST of NCBI’s GenBank nucleotide database, the most similar sequence was Sporidesmiella obovoidia. The nucleotide comparison between S. lignicola and S. obovoidia showed differences of 10 and 4 nucleotides in ITS and LSU sequence data, respectively (Fig. 4, Fig. 5), which supported them to be different species (Jeewon and Hyde 2016).

Figure 4.

The specific base differences between S. lignicola and S. obovoidia in ITS. Different base pairs have been marked on specific sites, and the same base is omitted.

Figure 5.

The specific base differences between S. lignicola and S. obovoidia in LSU. Different base pairs have been marked on specific sites, and the same base is omitted.

Unfortunately, the strain could not be successfully activated due to improper operation during preservation. When the original culture was retained for 6 months, the sporulation of mycelium could be observed under the microscope (Fig. 2). We deposited the dried culture as specimens (HFJAU 10001) of this species.

Analysis

Phylogenetic analyses

The analysed dataset comprised 35 taxa retrieved from GenBank and we selected Botryotinia fuckeliana (AFTOL-ID 59) as the outgroup taxon (Table 1). Partial nucleotide sequences of LSU (844bp), ITS (598bp), TEF1α (881bp), RPB2 (1059bp) and, for a total of 3382 characters including gaps, were used to determine the phylogenetic placement of the new taxon. The generated ML and Bayesian trees were similar in topology and the best scoring RAxML tree is presented in Fig. 6.

Figure 6.

Phylogenetic tree inferred from a Maximum Likelihood analysis, based on a concatenated alignment of LSU, ITS, TEF1α and RPB2 sequences of 35 strains representing Sporidesmiella species and other similar species. Bootstrap support values (ML) for Maximum Likelihood higher than 80% and Bayesian posterior probabilities (PP) greater than 0.80 are given at the nodes as ML/PP. The root of this tree is Botryotinia fuckeliana. Ex-type strains are in bold; new species are highlighted in red.

The phylogenetic tree demonstrated that the new taxon (Sporidesmiella lignicola), together with species of S. obovoidia, S. hyalosperma, S. aquatica and S. novae-zelandiae, formed a distinct clade representing the genus Sporidesmiella with strong bootstrap support (100% MLBS, 1.00 PP). Additionally, in our phylogenetic analysis, the three genera Dictyosporella, Junewangia and Sporidesmiella constituted a well-supported clade with strong ML and BYPP bootstrap support (100% MLBS, 1.00 PP), which is in accordance with Luo et al. (2019) and Dong et al. (2021). Sporidesmiella lignicola appeared closely related to S. obovoidia and S. hyalosperma. Although S. lignicola (JAUCC 3436) clustered together in S. obovoidia (MFLUCC 17-2372) with high support (88% MLBS, 1.00 PP), they are not phylogenetically identical.

Discussion

Kirk (1982) established the genus Sporidesmiella with S. claviformis as the type species, which had accommodated 40 species before this study. This study introduced Sporidesmiella lignicola as a new hyphomycetous fungus from freshwater habitats. In our phylogenetic analysis, S. lignicola clustered in Sporidesmiella, together with Dictyosporella and Junewangia forming a well-supported clade representing Junewangiaceae.

Many species of Sporidesmiella are found on decaying leaves, wood, bark, dead branches, cane and culms. At present, only three species have been found on submerged wood. Our research provides a new freshwater fungus found on submerged wood for Sporidesmiella and we provide four new sequences data, enriching the molecular database of Sporidesmiella.

As a decomposer, lignicolous freshwater fungi play an important role in freshwater ecosystem and material cycles in nature. They are also important biological resources, which have great application potential. Lignicolous freshwater fungi are a great treasure of resources to be developed. Many unknown species are waiting for us to understand and explore.

Acknowledgements

Funds for research were provided by the National Natural Science Foundation of China (NSFC 32070023 and NSFC 32060014), the Key Projects of Youth Fund of Jiangxi Science and Technology Department of China (20192ACBL21017), Natural Science Foundation of Education Department of Jiangxi Province of China (GJJ190168).

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Supplementary material

Endnotes