Two new species of Neopestalotiopsis from southern China

Qi Yang; Xiang-Yu Zeng; Jun Yuan; Qian Zhang; Yu-Ke He; Yong Wang

doi:10.3897/BDJ.9.e70446

Biodiversity Data Journal : Taxonomic Paper

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Taxonomic Paper

Two new species of Neopestalotiopsis from southern China

Qi Yang^‡, Xiang-Yu Zeng^‡, Jun Yuan^‡, Qian Zhang^‡, Yu-Ke He^§, Yong Wang^‡

‡ Department of Plant Pathology, Agricultural College, Guizhou University, Guiyang, China

§ Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand

Corresponding author: Yong Wang (yongwangbis@aliyun.com)

Academic editor: Renan Barbosa

Received: 21 Jun 2021 | Accepted: 24 Jul 2021 | Published: 25 Aug 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: Yang Q, Zeng X-Y, Yuan J, Zhang Q, He Y-K, Wang Y (2021) Two new species of Neopestalotiopsis from southern China. Biodiversity Data Journal 9: e70446. https://doi.org/10.3897/BDJ.9.e70446

Abstract

Background

Pestalotiopsis-like fungi are widely distributed in many plants and include endophytes, pathogens and saprobes. Five strains of Neopestalotiopsis were isolated from diseased leaves of Rhapis excelsa (Principes, Palmae), Rhododendron simsii and Rho. championiae (Ericales, Ericaceae) and Erythropalum scandens (Santalales, Olacaceae) in southern China.

New information

Based on morphology and multi-gene (ITS, tub2, tef1) phylogeny, our five strains of Neopestalotiopsis represent two new species and one extant species. Descriptions, illustrations and notes are also provided for the new species.

Keywords

two new taxa, Sporocadaceae, taxonomy

Introduction

Sporocadaceae was introduced by Corda (1842) and comprised abundant endophytic, plant pathogenic or saprobic taxa (Liu et al. 2019). A great part of Sporocadaceae species were reported as important plant pathogenic fungi that mainly harm various economic crops, such as tea, blueberry and elephant apple (Fernández et al. 2015, Banerjee et al. 2018, Tsai et al. 2020). Jaklitsch et al. (2016) synonymised Bartaliniaceae, Discosiaceae, Pestalotiopsidaceae and Robillardaceae under Sporocadaceae. Liu et al. (2019) studied the taxonomy of Sporocadaceae and accommodated 30 genera in it. Hyde et al. (2020) and Wijayawardene et al. (2020) placed Sporocadaceae in Amphisphaeriales and accepted 33 genera.

Neopestalotiopsis was introduced by Maharachchikumbura et al. (2014) to accommodate pestalotiopsis-like taxa that had versicolorous median cells and indistinct conidiophores. Until now, 49 taxa of Neopestalotiopsis are known (Mycobank 2021: https://www.mycobank.org/page/Home). This group commonly occurs on plants as endophytes, pathogens or saprobes (Jeewon et al. 2004, Liu et al. 2010, Hyde et al. 2016, Reddy et al. 2016, Shetty et al. 2016, Ran et al. 2017, Bezerra et al. 2018, Freitas et al. 2019). Recently, research showed them as plant pathogens causing stem blight, flower bight, twig dieback and fruit rot (Akinsanmi et al. 2016, Borrero et al. 2017, Mahapatra et al. 2018, Rodríguez-Gálvez et al. 2020). In the past few years, China and Thailand are places where most species of Neopestalotiopsis were found (Norphanphoun et al. 2019).

Amongst surveys of microfungi in southern China, we made five collections of Neopestalotiopsis from four host plants. Based on morphological descriptions and molecular analyses of three gene loci, our strains represent two new species and one known species.

Materials and methods

Sample collection and fungi isolation

Diseased leaf samples with fruiting bodies were collected from major botanical gardens in Yunnan, Guangxi and Guizhou Provinces in southern China. After surface disinfection of the diseased tissues (Zhang et al. 2020), the single-spore method was used for obtaining a pure culture (Senanayake et al. 2020). The isolates were transferred to new potato dextrose agar (PDA) plates to obtain a pure strain.

Morphology study

Cultures growing on potato dextrose agar (PDA) were incubated under moderate temperatures (28ºC) for 2−4 weeks in 12 h daylight. The diameter of cultures was measured after 1 week and the colour was determined with the colour charts of Rayner (1970). The morphological features were noted and recorded following Hu et al. (2007). Microscopic preparations were prepared in lactophenol and over 30 measurements were obtained per structure. Photographs were taken using a compound microscope (Olympus BX53, Japan). The holotype specimens were deposited in the Herbarium of Department of Plant Pathology, Agricultural College, Guizhou University (HGUP). Ex-type cultures were deposited in the Culture Collection at the Department of Plant Pathology, Agriculture College, Guizhou University, China (GUCC).

DNA extraction and PCR amplification

DNA extraction and PCR amplification follow Dissanayake et al. (2020) with some minor changes. A Fungus Genomic DNA Extraction Kit (Biomiga#GD2416, San Diego, California, USA) was used to extract fungal genome DNA. DNA amplification was performed in a 25 µl reaction mixture which contains 2.5 µl 10 × PCR buffer, 1 µl of each primer (10 µM), 1 µl template DNA and 0.25 µl Taq DNA polymerase (Promega, Madison, WI, USA). The ITS rDNA region was amplified using primer pairs ITS4 and ITS5 (White et al. 1990). The partial tub2 gene region was amplified with primer pairs T1 and Bt2b (Glass and Donaldson 1995, O'Donnell and Cigelnik 1997). The tef1 gene fragment was amplified using the primer pairs EF1-728F and EF-2 (O'Donnell et al. 1998, Carbone and Kohn 1999). PCR amplification conditions were performed according to the methods described by Norphanphoun et al. (2019). The PCR products were sent to SinoGenoMax company (Beijing, China) which used the fluorescently-labelled Sanger method for sequencing. The resulting DNA sequences were submitted to GenBank (https://www.ncbi.nlm.nih.gov/genbank/) and their accession numbers were provided in Table 1.

Table 1.

Download as

CSV

XLSX

The reference sequences used for phylogenetic analyses in this study with their GenBank accession numbers. (T) = ex-type strain.

Species name	Strain number	GenBank Accession numbers			Reference
Species name	Strain number	ITS	tub2	tef1	Reference
Neopestalotiopsis acrostichi	MFLUCC 17-1754^T	MK764272	MK764338	MK764316	Norphanphoun et al. (2019)
	MFLUCC 17-1755	MK764273	MK764339	MK764317	Norphanphoun et al. (2019)
N. alpapicalis	MFLUCC 17-2544	MK357772	MK463545	MK463547	Kumar et al. (2019)
	MFLUCC 17-2545	MK357773	MK463546	MK463548	Kumar et al. (2019)
N. aotearoa	CBS 367.54^T	KM199369	KM199454	KM199526	Maharachchikumbura et al. (2014)
	HNPeHNLD2001	MT764947	MT796262	MT800516	Direct submission
N. asiatica	MFLUCC 12-0286^T	JX398983	JX399018	JX399049	Maharachchikumbura et al. (2012)
N. australis	CBS 114159^T	KM199348	KM199432	KM199537	Maharachchikumbura et al. (2014)
N. brachiata	MFLUCC 17-1555^T	MK764274	MK764340	MK764318	Norphanphoun et al. (2019)
N. brasiliensis	COAD 2166^T	MG686469	MG692400	MG692402	Bezerra et al. (2018)
N. chiangmaiensis	MFLUCC 18-0113^T	-	MH412725	MH388404	Tibpromma et al. (2018)
N. chrysea	MFLUCC 12-0261^T	JX398985	JX399020	JX399051	Maharachchikumbura et al. (2012)
N. clavispora	MFLUCC 12-0281^T	JX398979	JX399014	JX399045	Maharachchikumbura et al. (2012)
	CBS 447.73	KM199374	KM199443	KM199539	Maharachchikumbura et al. (2014)
N. cocoes	MFLUCC 15-0152^T	KX789687	-	KX789689	Hyde et al. (2016)
N. coffea-arabicae	HGUP4015^T	KF412647	KF412641	KF412644	Song et al. (2013)
N. cubana	CBS 600.96^T	KM199347	KM199438	KM199521	Maharachchikumbura et al. (2014)
N. dendrobii	MFLUCC 14-0106^T	MK993571	MK975835	MK975829	Ma et al. (2019)
	MFLUCC 14-0132	MK993572	-	MK975830	Ma et al. (2019)
N. egyptiaca	COAD 2167	MG686470	MG692401	MG692403	Silva et al. (2018)
N. ellipsospora	MFLUCC 12-0284	JX398981	JX399015	JX399046	Maharachchikumbura et al. (2012)
	MFLUCC 12-0283^T	JX398980	JX399016	JX399047	Maharachchikumbura et al. (2012)
N. eucalypticola	CBS 264.37^T	KM199376	KM199431	KM199551	Maharachchikumbura et al. (2014)
N. foedans	CGMCC3.9178	JX398989	JX399024	JX399055	Maharachchikumbura et al. (2014)
	CGMCC3.9123^T	JX398987	JX399022	JX399053	Maharachchikumbura et al. (2014)
N. formicarum	CBS 362.72^T	KM199358	KM199455	KM199517	Maharachchikumbura et al. (2014)
	CBS 115.83	KM199344	KM199444	KM199519	Maharachchikumbura et al. (2014)
N. honoluluana	CBS 111535	KM199363	KM199461	KM199546	Maharachchikumbura et al. (2014)
	CBS 114495^T	KM199364	KM199457	KM199548	Maharachchikumbura et al. (2014)
N. iranensis	CBS 137768^T	KM074048	KM074057	KM074051	Ayoubi and Soleimani (2016)
N. javaensis	CBS 257.31^T	KM199357	KM199437	KM199543	Maharachchikumbura et al. (2014)
	MFLUCC 12-0594	KX816905	KX816933	KX816874	Maharachchikumbura et al. (2014)
N. keteleeria	MFLUCC 13-0915	KJ503820	KJ503821	KJ503822	Song et al. (2014)
N. macadamiae	BRIP 63737c^T	KX186604	KX186654	KX186627	Akinsanmi et al. (2017)
	BRIP 63757a	KX186592	KX186674	KX186647	Akinsanmi et al. (2017)
N. magna	MFLUCC 12-0652^T	KF582795	KF582793	KF582791	Maharachchikumbura et al. (2014)
N. mesopotamica	CBS 336.86^T	KM199362	KM199441	KM199555	Maharachchikumbura et al. (2014)
	CBS 299.74	KM199361	KM199435	KM199541	Maharachchikumbura et al. (2014)
N. musae	MFLUCC 15-0776^T	KX789683	KX789686	KX789685	Hyde et al. (2016)
N. natalensis	CBS 138.41^T	KM199377	KM199466	KM199552	Maharachchikumbura et al. (2014)
N. nebuloides	BRIP 66617^T	MK966338	MK977632	MK977633	Crous et al. (2020)
N. pandanicola	KUMCC 17-0175^T	-	MH412720	MH388389	Tibpromma et al. (2018)
N. pernambucana	URM7148	-	-	KU306739	Silvério et al. (2016)
N. petila	MFLUCC 17-1737^T	MK764275	MK764341	MK764319	Norphanphoun et al. (2019)
	MFLUCC 17-1738	MK764276	MK764342	MK764320	Norphanphoun et al. (2019)
N. phangngaensis	MFLUCC 18-0119^T	MH388354	MH412721	MH388390	Tibpromma et al. (2018)
	MFLUCC 19-2741	-	MW148259	MW192200	Direct submission
N. piceana	CBS 394.48^T	KM199368	KM199453	KM199527	Maharachchikumbura et al. (2014)
	CBS 254.32	KM199372	KM199452	KM199529	Maharachchikumbura et al. (2014)
N. protearum	CBS 114178^T	JN712498	KM199463	KM199542	Maharachchikumbura et al. (2014)
	CBS 111506	MH553959	MH554618	MH554377	Liu et al. (2019)
N. rhapidis	GUCC 21501	MW931620	MW980441	MW980442	This study
N. rhizophorae	MFLUCC 17-1551^T	MK764277	MK764343	MK764321	Norphanphoun et al. (2019)
	MFLUCC 17-1550	MK764278	MK764344	MK764322	Norphanphoun et al. (2019)
N. rhododendri	GUCC 21504	MW979577	MW980443	MW980444	This study
	GUCC 21505	MW979576	MW980445	MW980446	This study
N. rosae	CBS 101057^T	KM199359	KM199429	KM199523	Maharachchikumbura et al. (2014)
	CBS 124745	KM199360	KM199430	KM199524	Maharachchikumbura et al. (2014)
N. rosicola	CFCC 51992	KY885239	KY885245	KY885243	Jiang et al. (2018)
	CFCC 51993	KY885240	KY885246	KY885244	Jiang et al. (2018)
N. samarangensis	CBS 115451	KM199365	KM199447	KM199556	Maharachchikumbura et al. (2014)
	SS010	JQ968609	JQ968610	JQ968611	Direct Submission
N. saprophytica	CBS 115452	KM199345	KM199433	KM199538	Maharachchikumbura et al. (2014)
	GUCC 21506	MW979578	MW980447	MW980449	This study
	GUCC 21507	MW979579	MW980448	MW980450	This study
N. sichuanensis	CFCC 54338	MW166231	MW218524	MW199750	Jiang et al. (2021)
	SM15-1C	MW166232	MW218525	MW199751	Jiang et al. (2021)
N. sonneratae	MFLUCC 17-1744^T	MK764279	MK764345	MK764323	Norphanphoun et al. (2019)
	MFLUCC 17-1745	MK764280	MK764346	MK764324	Norphanphoun et al. (2019)
Neopestalotiopsis sp.1	CFCC 54337	MW166233	MW218526	MW199752	Jiang et al. (2021)
	ZX12-1	MW166234	MW218527	MW199753	Jiang et al. (2021)
Neopestalotiopsis sp.2	CFCC 54340	MW166235	MW218528	MW199754	Jiang et al. (2021)
	ZX22B	MW166236	MW218529	MW199755	Jiang et al. (2021)
Neopestalotiopsis sp. nov.	GUCC 210001	MW930715	MZ683390	MZ683389	Direct Submission
Neopestalotiopsis sp. nov.	GUCC 210002	MW930716	MZ683391	MZ203452	Direct Submission
Neopestalotiopsis sp. nov.	GUCC 210003	MW936717	MZ683392	MZ540914	Direct Submission
N. steyaertii	IMI 192475^T	KF582796	KF582794	KF582792	Jiang et al. (2021)
N. surinamensis	CBS 450.74^T	KM199351	KM199465	KM199518	Maharachchikumbura et al. (2014)
	CBS 111494	-	KM199462	KM199530	Maharachchikumbura et al. (2014)
N. thailandica	MFLUCC 17-1730^T	MK764281	MK764347	MK764325	Norphanphoun et al. (2019)
	MFLUCC 17-1731	MK764282	MK764348	MK764326	Norphanphoun et al. (2019)
N. umbrinospora	MFLUCC 12-0285^T	JX398984	JX399019	JX399050	Maharachchikumbura et al. (2014)
N. vitis	MFLUCC 17-1108	MG807045	MG859849	MG859769	Jayawardena et al. (2016)
N. zimbabwana	CBS 111495^T	-	KM199456	KM199545	Maharachchikumbura et al. (2014)
Pestalotiopsis diversiseta	MFLUCC 12-0287^T	JX399009	JX399040	JX399073	Maharachchikumbura et al. (2012)
P. trachicarpicola	OP068^T	JQ845947	JQ845945	JQ845946	Zhang et al. (2012)

Sequence alignment and phylogenetic analyses

The reference sequences were downloaded from GenBank for phylogenetic analyses (Table 1). Multiple sequence alignments were generated with MAFFT v. 7.307 online version (Katoh and Standley 2016) and manually improved in MEGA v. 6.06, where necessary (Tamura et al. 2013). Concatenated multi-locus datasets for the three gene regions were aligned using Mesquite v. 2.75 (Maddison 2008). Manual improvement, when necessary, was done using AliView (Larsson 2014). Terminal ends and ambiguous regions of the alignment were deleted manually. Phylogenetic analyses were performed using concatenated sequences of the three loci (ITS, tub2 and tef1) with Maximum Likelihood (ML), Maximum Parsimony (MP) and Bayesian Inference (BI).

Maximum Likelihood analysis was performed at the CIPRES Science Gateway web portal (Miller et al. 2010) using RAxML-HPC BlackBox v. 8.2.12 with the GTR+G+I model and 1,000 rapid bootstrap (BS) replicates (Stamatakis 2014).

Bayesian analysis was conducted with MrBayes v. 3.1.2 (Huelsenbeck and Ronqvist 2001). Parameters of Bayesian analysis in MrBayes v. 3.2; Markov chains were run for 1000000 generations and trees were sampled every 100th generation (printfreq = 100) and 10000 trees were obtained. The last standard deviation of split frequencies was below 0.01. Initial trees were discarded (25% burn-in value) and the remaining trees were used to evaluate posterior probabilities (PP) in the majority rule consensus tree.

PAUP v. 4.0b10 (Swofford 2002) was used to perform Maximum Parsimony (MP) analyses. Trees were inferred by using the heuristic search option with 1,000 random sequence additions and tree bisection and reconnection (TBR) as the branch-swapping algorithm. The maxtrees were set as 5000. Descriptive tree statistics for parsimony (tree length (TL), consistency index (CI), retention index (RI), related consistency index (RC) and homoplasy index (HI)) were calculated.

Data resources

Taxon treatments

Neopestalotiopsis rhapidis Qi Yang & Yong Wang bis, sp. nov.

MycoBank 840065

Material Download as CSV

Holotype:

scientificName:
Neopestalotiopsis rhapidis
; order:
Amphisphaeriales
; family:
Sporocadaceae
; genus:
Neopestalotiopsis
; country:
China
; stateProvince:
Guangxi
; locality:
Nanning City, Guangxi Medicinal Botanical Garden
; verbatimCoordinates:
108°19’ E,22°51’ N
; recordedBy:
Qi Yang
; identifiedBy:
Qi Yang
; dateIdentified:
2021
; collectionID:
HGUP 332
; occurrenceID:
GUCC 21501

Description

Disease symptom: Pathogenic causing spots on leaves tip of Rhapis excelsa. Leaf spots shape irregular, brown, slightly sunken on leaves tip. Small brown spots appeared initially and then gradually enlarged, changing to dark brown spots with a yellow border and jagged edge.

Colonies on PDA reach 7.5–8 cm in diam. after 7 d at room temperature (28°C), under light 12 hr/dark. Colonies filamentous to circular, whitish, with clustered black fruiting bodies and filiform and fluffy margin, white from above and light yellow from the reverse. Sexual morph: undetermined. Asexual morph（Fig. 1): Conidiomata 560–1405 µm in diam., pycnidial, globose, solitary, black, semi-immersed on PDA, exuding brown to dark brown conidia. Conidiophores branched or unbranched, hyaline, thin-walled. Conidiogenous cell discrete to lageniform, obclavate, hyaline or rarely light brown, smooth-walled. Conidia (22–)25.5 × 4(–6) µm (x̄ = 23 × 5.2 µm, n = 30), fusiform to clavate, straight to slightly curved, 4-septate; basal cell cylindrical to obconic, hyaline, thin-walled, smooth, 3–5 µm (x̄ = 3.7 µm, n = 30); the three median cells 11.5–15 µm (x̄ = 13.3 µm, n = 30), dark brown with septa darker than the rest of the cells, the second cell from base 3–5 µm (x̄ = 4 µm, n = 30); the third cell 2.5–6 µm (x̄ = 3.9 µm, n = 30); the fourth cell 3–4.5 µm (x̄ = 3.8 µm, n = 30); apical cell 2–4.5 µm (x̄ = 3.3 µm, n = 30), cylindrical, hyaline; 2–3 (mostly 3) tubular apical appendages, arising from the apex of the apical cell each at different points, flexuous, 11–16 µm (x̄ = 13.6 µm, n = 30); basal appendage present, single, tubular, unbranched, 2–5.5 µm (x̄ = 4 µm, n = 30).

Figure 1.

Neopestalotiopsis rhapidis (GUCC 21501). a. Leaf spots of Neopestalotiopsis rhapidis; b, c. Culture on PDA (b-above, c-reverse); d. Colony sporulating on PDA; e–g. Conidiophores; h–k. Conidia. Scale bars: d = 1000 µm, e–k = 20 µm.

Etymology

Latin, rhapidis, refers to the host plant (Rhapis excelsa) from which the fungus was isolated.

Notes

Neopestalotiopsis rhapidis clustered with N. cocoes (MFLUCC 15-0152) with 85% ML support, although without enough MP and BI support. Within comparison of the three gene regions, there were only three character differences in the ITS region, but 27 in the tef1 region. Neopestalotiopsis rhapidis has longer conidia and shorter apical appendages than those of N. cocoes (19–22.5 ×7.5–9.5 µm; 14.9–21 µm) (Hyde et al. 2016). Thus, Neopestalotiopsis rhapidis (GUCC 21501) is introduced as a new species herein.

Neopestalotiopsis rhododendri Qi Yang & Yong Wang bis, sp. nov.

MycoBank 840066

Materials Download as CSV

Holotype:

scientificName:
Neopestalotiopsis rhododendri
; order:
Amphisphaeriales
; family:
Sporocadaceae
; genus:
Neopestalotiopsis
; country:
China
; stateProvince:
Yunnan
; locality:
Kunming
; verbatimCoordinates:
102°72’ E,25°05’ N
; recordedBy:
Qi Yang
; identifiedBy:
Qi Yang
; dateIdentified:
2021
; collectionID:
HGUP 134
; occurrenceID:
GUCC 21504

Other material:

scientificName:
Neopestalotiopsis rhododendri
; order:
Amphisphaeriales
; family:
Sporocadaceae
; genus:
Neopestalotiopsis
; country:
China
; stateProvince:
Guizhou
; locality:
Kaili
; verbatimCoordinates:
107°97’ E,26°58’ N
; recordedBy:
Qi Yang
; identifiedBy:
Qi Yang
; dateIdentified:
2021
; collectionID:
HGUP 997
; occurrenceID:
GUCC 21505

Description

Disease symptom: Associated with leaf spots of Rhododendron simsii. The leaf spots are small irregular to subcircular shape, brown, slightly sunken spots appear on surface leaves of R. simsii, which scattered on the surface leaves tip and eventually develops into a large lesion. Small off-white spots appeared initially and then gradually enlarged, changing to light brown circular ring spots with a dark brown border.

Colonies on PDA reaching 6.5–7 cm in diam. after 7 d at room temperature (28°C), under light 12 hr/dark. Hyphae white, colonies filamentous to circular, slightly undulate at the edge, with black fruiting bodies clustered, has filiform and fluffy margin, white from above and light yellow from the reverse. Sexual morph: undetermined. Asexual morph（Fig. 2）: Conidiomata 55–280 µm in diam., pycnidial, globose, solitary, black, semi-immersed on PDA, exuding brown to dark brown mass of conidia. Conidiophores often reduced to conidiogenous cell, regularly septate and branched at the base. Conidiogenous cells mostly integrated, ampulliform, cylindrical, hyaline to light brown, smooth-walled. Conidia (25.5–)30 × 5(–6) µm (x̄ = 27.6 × 5.5 µm, n = 30), fusiform to clavate, straight to slightly curved, 4-septate; basal cell obconic, hyaline, thin-walled, smooth, 3.5–6.5 µm (x̄ = 4.5 µm, n = 30); the three median cells 13.5–19.5 µm (x̄ = 16.3 µm, n = 30), light brown to dark brown, dark brown with septa darker than the rest of the cells, the second cell from base 4–6 µm (x̄ = 5 µm, n = 30); the third cell 3.5–5.5 µm (x̄ = 4.5 µm, n = 30); the fourth cell 4–6.5 µm (x̄ = 4.8 µm, n = 30); apical cell 3.5–6.3 µm (x̄ = 5 µm, n = 30), cylindrical to sub-cylindrical, hyaline, 1–3 (mostly 2) tubular apical appendages, arising from the apex of the apical cell each at different points, 21–38.5 µm (x̄ = 29.2 µm, n = 30); basal appendage present most of the time, single, tubular, unbranched, 6–11.5 µm (x̄ = 8.5 µm, n = 30).

Figure 2.

Neopestalotiopsis rhododendri (GUCC 21504). a, b, c. Leaf spots of Neopestalotiopsis rhododendri; d, e. Culture on PDA (d-above, e-reverse); f. Colony sporulating on PDA; g–h. Conidia and conidiophores; i–m. Conidia. Scale bars: f = 1000 µm, g–m = 20 µm.

Etymology

China, Yunnan Province, Kunming City, from leaves of Rhododendron simsii, 12 February 2018, Q. Zhang, HGUP 134, holotype, ex-type living culture GUCC 21504.

Notes

In the multi-gene analysis, strain GUCC 21504 formed a distinct clade with a sister strain GUCC 21505, but the node support values were 68/90/- (MP/ML/BI) and these two strains were close to N. protearum (CBS 114178). When comparing the polymorphic nucleotide differences of our two strains, there are 18 base pair differences, seven in ITS, two in tub2 and nine in tef1, but without obvious distinction (higher than 98.5%). Compared with N. protearum and our ex-type strain (GUCC 21504), there were six character differences with N. protearum in the ITS region, three character differences with N. protearum in the tub2 region, but 12 character differences from N. protearum in the tef1 region; thus the DNA base pair differences were mainly in the tef1 gene regions. The morphological differences between our strains and N. protearum were wider conidia (N. protearum: 24.8 ± 1.5 × 8.5 ± 0.6 µm), more apical appendages (N. protearum: 3–5) and shorter basal appendages (N. protearum: 5–8 µm) (Maharachchikumbura et al. 2014). Thus, Neopestalotiopsis rhododendri is introduced as a novel taxon, based on morphology and phylogeny.

Neopestalotiopsis saprophytica (Maharachch. & K.D. Hyde) Maharachch., K.D. Hyde & Crous, 2014

MycoBank 809780

Materials Download as CSV

scientificName:
Neopestalotiopsis saprophytica
; order:
Amphisphaeriales
; family:
Sporocadaceae
; genus:
Neopestalotiopsis
; country:
China
; stateProvince:
Guangxi
; locality:
Nanning City，Guangxi Medicinal Botanical Garden
; verbatimCoordinates:
108°19’ E,22°51’ N
; recordedBy:
Qi Yang
; identifiedBy:
Qi Yang
; dateIdentified:
2021
; collectionID:
HGUP 423
; occurrenceID:
GUCC 21506
scientificName:
Neopestalotiopsis saprophytica
; order:
Amphisphaeriales
; family:
Sporocadaceae
; genus:
Neopestalotiopsis
; country:
China
; stateProvince:
Guangxi
; locality:
Nanning City,Guangxi Medicinal Botanical Garden
; verbatimCoordinates:
108°19’ E,22°51’ N
; recordedBy:
Qi Yang
; identifiedBy:
Qi Yang
; dateIdentified:
2021
; collectionID:
HGUP 133
; occurrenceID:
GUCC 21507

Description

Disease symptom: Pathogenic causing spots on leaves of Erythropalum scandens. Leaf spots shape irregular, brown to reddish-brown, slightly sunken spots appear on surface leaves of E. scandens, which scattered on the leaves tip. Small brown spots appeared initially and then gradually enlarged, changing to reddish-brown spots with a yellow border.

Colonies on PDA reaching 7.5–8 cm in diam. after 7 d at room temperature (28℃), under light 12 hr/dark. Hyphae change from light pink to off-white. Colonies filamentous to circular, slightly undulate at the edge, with black fruiting bodies clustered, filiform margin, light pink from above and light yellow from the reverse. Sexual morph: undetermined. Asexual morph (Fig. 3): Conidiomata up to 280 μm in diam., pycnidial, globose, solitary, black, semi-immersed on PDA, exuding brown to dark brown mass of conidia. Conidiophores branched or unbranched, hyaline, thin-walled. Conidiogenous cells discrete, ampulliform to lageniform, hyaline, thin-walled, smooth. Conidia (21.5–)26.5 × 4.5(–6.5) µm (x̄ = 23.2 × 5.2 µm, n = 30), fusiform to clavate, straight to slightly curved, 4-septate; basal cell obconic, hyaline or sometimes pale brown, thin-walled, smooth, 3–5 µm (x̄ = 4 µm, n = 30); the three median cells 13–17 µm (x̄ = 14.9 µm, n = 30), pale brown to brown, dark brown with septa darker than the rest of the cells, the second cell from base 4–6.5 µm (x̄ = 4.9 µm, n = 30); the third cell 3–5 µm (x̄ = 4.1 µm, n = 30); the fourth cell 3.5–6 µm (x̄ = 4.8 µm, n = 30); apical cell 3–5 µm (x̄ = 3.9 µm, n = 30), cylindrical, hyaline; 1–4 (mostly 3) tubular apical appendages, arising from the apex of the apical cell each at different point, flexuous, 18–28.5 µm (x̄ = 22.4 µm, n = 30); basal appendage present most of the time, single, tubular, unbranched, 3.3–7 µm (x̄ = 4.3 µm, n = 30).

Figure 3.

Neopestalotiopsis saprophytica (GUCC 21506). a, b, c. Leaf spots of Neopestalotiopsis saprophytica; d, e. Culture on PDA (d-above, e-reverse); f. Colony sporulating on PDA; g–h. Conidia and conidiophores; i–m. Conidia. Scale bars: f = 1000 µm, g–m = 20 µm.

Notes

GUCC 21506 and GUCC 21507 with the same nucleotides sequences were related to N. dendrobii (MFLUCC 14-0106) and N. saprophytica (CBS 115452). There were ten character differences with N. dendrobii and 11 character differences with N. saprophytica, but the most differences (nine character differences) between our strains and N. saprophytica were only in the tef1 region. Alternatively, collection differed to N. dendrobii in having more apical appendages (N. dendrobii: 2–3) and much longer apical appendages (N. dendrobii: 6 ± 0.9 µm) (Ma et al. 2019). Morphological characters of our collections and N. saprophytica overlapped (Maharachchikumbura et al. 2014). Thus, GUCC 21506 and GUCC 21507 are considered as N. saprophytica.

Identification keys

Analysis

Phylogenetic analyses

The final dataset consists of 57 taxa, including Pestalotiopsis diversiseta (MFLUCC 12-0287) and P. trachicarpicola (OP068) as the outgroup taxa. It comprised 2052 characters including gaps (tef1: 1−606, tub2: 607−1443 and ITS: 1444−2052). There were 1426 constant, 284 parsimony uninformative and 342 parsimony informative characters (TL = 1225 steps, CI = 0.66, RI = 0.70, RC= 0.46 and HI= 0.34). The most parsimonious tree generated from combined ITS, tub2 and tef1 sequence data of species of Neopestalotiopsis is shown in Fig. 4.

Figure 4.

The phylogram generated from MP analysis, based on combined ITS, tub2 and tef1 sequence data of Neopestalotiopsis. The tree was rooted with Pestalotiopsis diversiseta (MFLUCC 12-0287) and P. trachicarpicola (OP068). Maximum Parsimony and Maximum Likelihood bootstrap values ≥ 50%, Bayesian posterior probabilities ≥ 0.90 (MPBS/MLBS/PPBY) were given at the nodes. Our strains in this study were in green. Ex-type strains were marked by T.

In the phylogenetic analyses, GUCC 21501 was sister to N. cocoes (MFLUCC 15-0152^T), but only with a 85% ML bootstrap support. GUCC 21504 and GUCC 21505 formed an independent clade with MP and ML (68/90) supports and were close to N. protearum (CBS 111506^T). GUCC 21506 and GUCC 21507 clustered with moderate and high supports (65/99/1: MP/ML/BI) and kept a very close relationship with N. saprophytica (CBS 115452) by credible statistic support (100/67/1: MP/ML/BI). DNA sequence differences between our strains and related species are listed in Table 2.

Table 2.

Download as

CSV

XLSX

DNA sequence differences of the three gene regions between our strains and related species.

Species	Strain number	tef1	tub2	ITS
		tef1	tub2	ITS
		(characters: 1-606)	(characters: 607-1443)	(characters: 1444-2052)
N. rhapidis	GUCC 21501	0	0	0
N. cocoes	MFLUCC 15-0152^T	27 (gaps: 2)	-	3 (gaps: 3)
Species	Strain number	tef1	tub2	ITS
		tef1	tub2	ITS
		(characters: 1-606)	(characters: 607-1443)	(characters: 1444-2052)
N. saprophytica	GUCC 21506	0	0	0
	GUCC 21507	0	0	0
N. dendrobii	MFLUCC 14-0106^T	5 (gaps: 3)	4 (gap: 1)	1 (gap: 0)
N. saprophytica	CBS 115452	9 (gaps: 3)	1 (gap: 0)	1 (gap: 1)
Species	Strain number	tef1	tub2	ITS
		tef1	tub2	ITS
		(characters: 1-606)	(characters: 607-1443)	(characters: 1444-2052)
N. rhododendri	GUCC 21504	0	0	0
	GUCC 21505	9 (gap: 0)	2 (gap: 0)	7 (gap: 1)
N. protearum	CBS 114178^T	12 (gaps: 6)	3 (gap: 0)	9 (gaps: 2)

Discussion

Hu et al. (2007) believed that pestalotiopsis-like fungi had different phenotypes in conidial morphology. Maharachchikumbura et al. (2014) summarised some stable characteristics for determining pestaloids, such as the length and width of conidia, length of the apical appendages, presence or absence of knobbed apices and the position of the apical appendage attached to the conidial body. However, as these characteristics were often similar or overlapped, sequence data are crucial for the identification of pestalotioid, and as well as for the introduction of new species (Norphanphoun et al. 2019).

In this study, we describe two new species as Neopestalotiopsis rhapidis and N. rhododendri. The species were distinct from extant Neopestalotiopsis species, based on morphological and phylogenetic analyses. However, the statistical support of main nodes for the genus were very low (Fig. 4). The reason might be that the reference sequences we used were short, including the short tef1 and tub2 sequences (Ran et al. 2017). Longer sequences with more informative data are needed to solve this problem. Furthermore, our study also found that the evolutionary relationships amongst species of Neopestalotiopsis are unstable (Maharachchikumbura et al. 2014, Jiang et al. 2018, Kumar et al. 2019, Tsai et al. 2020). Therefore, other genes are needed to distinguish the inter-species relationships in Neopestalotiopsis (Maharachchikumbura et al. 2014, Kumar et al. 2019, Norphanphoun et al. 2019).

Several indicators could be used in the classification of Neopestalotiopsis in this study, such as the size of conidia and the number and length of appendages (Maharachchikumbura et al. 2014, Freitas et al. 2019, Kumar et al. 2019). The differences in the colour of three median cells and the length of other cells, however, lacked significant variation to clearly distinguish the species of Neopestalotiopsis. Therefore, as the morphological identification alone cannot accurately identify the fungi of the genus Neopestalotiopsis, it must be combined with the phylogenetic tree (Liu et al. 2019, Norphanphoun et al. 2019, Tsai et al. 2020, Jiang et al. 2021).

Acknowledgements

The research was supported by National Natural Science Foundation of China (No. 31972222, 31560489), Program of Introducing Talents of Discipline to Universities of China (111 Program, D20023), Talent Project of Guizhou Science and Technology Cooperation Platform ([2017]5788-5, [2019]5641 and [2020]5001) and Guizhou Science, Technology Department International Cooperation Basic Project ([2018]5806). We also thank Profs. Kevin D. Hyde and Sajeewa Maharachchikumbura for their help to improve this paper.

Author contributions

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Supplementary material

Endnotes