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Article

Phylogenetic Analysis of Trichoderma Species Associated with Green Mold Disease on Mushrooms and Two New Pathogens on Ganoderma sichuanense

by
Xiao-Ya An
1,2,
Guo-Hui Cheng
1,2,
Han-Xing Gao
2,
Xue-Fei Li
2,
Yang Yang
3,
Dan Li
2,* and
Yu Li
1,2,*
1
Department of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China
2
Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal Fungi, Jilin Agricultural University, Changchun 130118, China
3
Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
*
Authors to whom correspondence should be addressed.
J. Fungi 2022, 8(7), 704; https://doi.org/10.3390/jof8070704
Submission received: 8 June 2022 / Revised: 29 June 2022 / Accepted: 1 July 2022 / Published: 3 July 2022
(This article belongs to the Special Issue Fungal Taxonomy, Phylogeny, and Ecology: A Themed Issue Dedicated to Academician Wen-Ying Zhuang)
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Abstract

:
Edible and medicinal mushrooms are extensively cultivated and commercially consumed around the world. However, green mold disease (causal agent, Trichoderma spp.) has resulted in severe crop losses on mushroom farms worldwide in recent years and has become an obstacle to the development of the Ganoderma industry in China. In this study, a new species and a new fungal pathogen on Ganoderma sichuanense fruitbodies were identified based on the morphological characteristics and phylogenetic analysis of two genes, the translation elongation factor 1-α (TEF1) and the second-largest subunit of RNA polymerase II (RPB2) genes. The new species, Trichoderma ganodermatigerum sp. nov., belongs to the Harzianum clade, and the new fungal pathogen was identified as Trichoderma koningiopsis. Furthermore, in order to better understand the interaction between Trichoderma and mushrooms, as well as the potential biocontrol value of pathogenic Trichoderma, we summarized the Trichoderma species and their mushroom hosts as best as possible, and the phylogenetic relationships within mushroom pathogenic Trichoderma species were discussed.

1. Introduction

Mushrooms have been used by humans for millennia and are consumed for their nutritive and medicinal values [1,2]. Most of them are appreciated as delicacies and are extensively cultivated and commercially consumed in many countries. Some mushrooms also have high pharmacological activities, especially Ganoderma spp. [3,4]. Ganoderma sichuanense, described from China and previously confused with G. lucidum, an oriental fungus, has a long history in China, Japan, and other Asian countries for promoting health and longevity [5,6]. The mushroom is famous for its pharmacological effects [7,8] and is widely cultivated in northeastern China. However, Trichoderma green mold diseases have increased and pose a serious threat to its production [9,10,11].
Trichoderma has been studied for more than 200 years since it was established by Persoon in 1794 [12], while sharp development occurred in the past few decades, when a large number of taxonomic articles were published [13,14,15,16,17,18,19,20,21,22,23,24,25,26]. At present, similar to Fusarium, Aspergillus, or Penicillium, Trichoderma is a species-rich genus [15] and has been segregated into many groups or clades based on the phylogenetic relationships within the genus [27,28,29]. Moreover, the rapid development of Trichoderma is inseparable from its various uses. For example, it can not only be used as a highly efficient producer of plant biomass-degrading enzymes for biofuel and other industries, but also as a very effective biological agent for plant disease management [30,31,32,33]. Furthermore, Trichoderma has also been an initially produce white and dense mycelia highly similar to mushroom mycelia, which makes it difficult to distinguish them, causing the best period of control to be missed. Thus, it is particularly important to explore the specificity of Trichoderma species and the interaction between Trichoderma and its host for disease control.
Between 2020 and 2021, during fieldwork at mushroom cultivation bases, we found that green mold disease occurred continuously in G. sichuanense production areas in the following provinces of China: Heilongjiang, Jilin, and Shandong, leading to a significant negative effect on the development of fruitbodies. We collected diseased specimens and isolated the pathogens from several bases and identified them based on molecular and morphological characteristics. A new Trichoderma species and a new host record were confirmed. In addition, we summarized the Trichoderma species reported on mushrooms as best as possible and provided their recorded hosts. The relationships among these species were also discussed by constructing a phylogeny tree with multi-locus data, which is expected to help us know more about the relationships between Trichoderma species and their hosts, and to help search for Trichoderma species with potential biocontrol value.

2. Materials and Methods

2.1. Fungal Isolation

Diseased samples of G. sichuanense were collected from Jilin, Heilongjiang, and Shandong Provinces, China, and deposited in the Herbarium of Mycology, Jilin Agricultural University (HMJAU). Diseased tissues were cut into small pieces (5 mm × 5 mm × 5 mm) using a sterilized scalpel, immersed in 75 percent alcohol for 45 s before being rinsed three times with sterilized water, and placed onto Potato Dextrose Agar (PDA, BD, USA) plates containing 100 mg/L of streptomycin sulfate (Solarbio, Bejing, China), and then incubated at room temperature. Pure cultures were obtained using single-spore isolates following the method described by Chomnuti et al. [34]. Germinated spores were transferred to fresh PDA plates and incubated at 25 °C for one or two weeks. Living cultures were deposited in the Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University (Changchun, Jilin, China).

2.2. Growth Characterization

Colony characteristics, growth rates, and optimum temperatures for growth were determined according to the methods of Jaklitsch [18,19] by using agar media cornmeal dextrose agar (CMD, 40 g cornmeal + 2% (w/v) dextrose (Genview, Beijing, China) + 2% (w/v) agar (Genview, Beijing, China)), PDA, and synthetic low nutrient agar (SNA, pH adjusted to 5.5) [35]. Colonies were incubated in 9 cm diameter Petri dishes at 25 °C with alternating 12 h/12 h fluorescent light/darkness and measured daily until the dishes were covered with mycelia. The influence of temperature on growth was studied by growing isolates on PDA, SNA, and CMD at 15 °C, 20 °C, 25 °C, 30 °C, and 35 °C under dark conditions. Each temperature was repeated for five plates, and the experiment was repeated three times.

2.3. Morphological Study

The characteristics of asexual states were described following the methods of Jaklitsch [36] and Rifai [37]. Microscopic observations were conducted using a Zeiss Axio Lab A1 light microscope (Göttingen, Germany) (objectives 10, 20, 40, and 100 oil immersion). All measurements and photographs were performed using a Zeiss Imager A2 microscope with an Axiocam 506 color camera and integrated software. Microscopically, the characteristics of 50 conidia and conidiophores from the isolates were observed. The effects of Trichoderma on Ganoderma morphology were studied using a Hitachi, model SU8010, Field Emission Scanning Electron Microscope (FESEM) at Jilin Agricultural University.

2.4. DNA Extraction, PCR, and Sequencing

Mycelia were harvested from three-day-old cultures on PDA for DNA extraction according to the manufacturer’s instructions (NuClean Plant Gen DNA Kit, CWBIO, Taizhou, China). Sequences of ITS, TEF1, and RPB2 genes were amplified by polymerase chain reaction (PCR) with the pairs of primers ITS4 (5′-TCCTCCGCTTATTGATATGC-3′) and ITS5 (5′-GGAAGTAAAAGTCGTAACAAGG-3′) [38], primers EF1-728F (5′-CATCGAGAAGTTCGAGAAGG-3′) [39] and TEF1-LLErev (5′-GCCATCCTTGGAGATACCAGC-3′) [40], and primers RPB2-5F (5′-GAYGAYMGWGATCAYTTYGG-3′) and RPB2-7CR (5′-CCCATRGCTTGYTTRCCCA-3′) [41], respectively.
PCR was carried out in a 25 μL reaction mixture containing 1 μL of DNA sample, 12.5 μL 2 × SanTaq PCR Mix (Sangon Biotech, Shanghai, China), 1 μL of each primer (10 µM), and 9.5 μL nuclease-free water. The PCR conditions were as follows: initial denaturation at 94 °C for 3 min, then denaturation at 94 °C for 30 s, annealing for 45 s with the corresponding temperatures (56 °C for TEF1, and 55 °C for RPB2), extension at 72 °C for 1 min, followed by 35 cycles, then a final extension at 72 °C for 10 min, using an Applied Biosystems S1000 TM Thermal Cycler machine. PCR products were sent to the Changchun Branch of Sangon Biotech Co., Ltd. (Changchun, China) for paired-end sequencing, and the results were first assembled using BioEdit [42] and then confirmed by BLAST on NCBI (https://blast.ncbi.nlm.nih.gov/Blast.cgi, accessed on 21 June 2021).

2.5. Phylogenetic Analyses

BLASTn searches with the sequences were performed against NCBI to detect the most closely related species (http://www.blast.ncbi.nlm.nih.gov/, accessed on 22 December 2021). Phylogenetic trees were constructed using TEF1 and RPB2 sequences, and phylogenetic analyses were performed with the Maximum Likelihood (ML), Maximum Parsimony (MP), and Bayesian Inference (BI) methods. New sequences were generated from the new species in this study, along with reference sequences retrieved from GenBank (Table 1). The Trichoderma sequences associated with mushroom green mold are listed in Table 2. Multiple alignments of all common sequences and reference sequences were automatically generated using MAFFT V.7.471 [43], with manual improvements made using BioEdit when necessary [42], and converted to nexus and NEX format through the software Aliview [44]. In the analysis, ambiguous areas were excluded and gaps were regarded as missing data.
An MP phylogram was constructed with PAUP 4.0b10 [106] from the combined sequences of TEF1 and RPB2, using 1000 replicates of a heuristic search with random addition of sequences and subsequent tree bisection and reconnection (tbr) branch swapping. Analyses were performed with all characters treated as unordered and unweighted, and gaps treated as missing data. The topological confidence of the resulting trees was tested by maximum parsimony bootstrap proportion (MPBP) with 1000 replications, each with 10 replicates of random addition of taxa. An ML phylogram was constructed with Raxmlgui 2.0 [107] with the sequence after alignment. The ML + Rapid bootstrap program and 1000 repeats of the GTRGAMMAI model were used to evaluate the bootstrap proportion (BP) of each branch for constructing the phylogenetic tree. The BI analysis was conducted using MrBayes 3.2.7 [108] using a Markov Chain Monte Carlo (MCMC) algorithm. Nucleotide substitution models were determined using MrModeltest 2.3 [109]. The best model for combined sequences was HKY + I + G.

3. Results

3.1. Molecular Phylogeny

Species recognition: The dataset for the new species phylogenetic analyses included sequences from 100 taxa (Table 1). Multi-locus data were concatenated, which comprised 2321 characters, with TEF1 1293 characters and RPB2 1028 characters. Estimated base frequencies were as follows: A = 0.231650, C = 0.281772, G = 0.234671, and T = 0.251907; substitution rates were as follows: AC = 1.069464, AG = 4.197119, AT = 0.935747, CG = 0.993621, CT = 4.979475, and GT = 1.000000. The MP and ML trees showed similar topologies with high statistical support values. The MP tree was selected as the representative phylogeny. In Bayesian analysis, the average standard deviation of split frequencies at the end of the total MCMC generations was calculated as 0.008946, which is less than 0.01. Most of the tree topologies resulting from three analyses were nearly the same. In the resulting tree (Figure 1), the combined phylogenetic analyses using TEF1-α and RPB2 showed that the six strains of T. ganodermatigerum represent phylogenetically distinct species with high statistical supports (MPBP/MLBP/BIBP = 100%/100%/1.0), and clustered together with the species in the Harzianum clade [16]. The new species is most related to the clade that contains T. amazonicum, T. pleuroticola, T. hengshanicum, and T. pleuroti. Two collections of CCMJ5253 and CCMJ5254 clustered with T. koningiopsis with high support (MPBP/MLBP = 100/100) (Figure 2).
Phylogenetic structure: Some sections could be found among the Trichoderma strains associated with mushrooms and are mainly concentrated in the Harzianum clade (Figure 2). Trichoderma longibrachiatum, T. citrinoviride, T. pseudokoningii, and T. ghanense are from section Longibrachiatum, whose members are best known as producers of cellulose-hydrolyzing enzymes [74,110,111]. Trichoderma atroviride, T. viride, T. koningii, T. hamatum, T. minutisporum, T. polysporum, T. viride, and T. asperellum are from section Trichoderma or the Viride clade [36,111].
The phylogenetic structure according to ecology: Species in the Harzianum clade are commonly fungicolous, living in different types of habitats [112,113]. They are most commonly isolated from soil or found on decomposing plant material where they occur cryptically or parasitize other fungi [18,53,114], and those species are possibly the most common endophytic “species” in wild trees [115,116]. There is usually no apparent host specialization [117]. However, some exceptions to this trend exist. Clade I in the Harzianum clade of the tree is a collection of species with relatively narrow host ranges, or in other words, a strong host preference. Trichoderma atrobrunneum was found in soil or on decaying wood, clearly or cryptically parasitizing other fungi. Trichoderma pleuroti, just like T. aggressivum, has thus far never been isolated from areas outside of mushroom farms [118]. Furthermore, T. epimyces has only been reported on Polyporus umbellatus [49], and T. priscilae has been reported from basidiomes of Crepidotus and Stereum [20].
Some other species such as T. atroviride, T. asperellum, T. harzianum, and T. longibrachiatum were also found in significant proportions in Agaricus compost [119]. Trichoderma stromaticum and its Hypocrea teleomorph are only known from cocoa and are often associated with tissue infected with the basidiomycetous pathogen Crinipellis perniciosa [55].
Although some of these pathogenic Trichoderma species (e.g., species gathered in or near Clade II) have been explored as biocontrol agents for plant diseases, T. atroviride, T. viride, T. koningii, T. koningiopsis, and T. asperellum serve as pathogens with broad host ranges on mushrooms. Trichoderma sulphureum, T. protopulvinatum, T. pulvinatum, and T. austriacum coalesce into a subclade (Clade III), and each of these species has been reported on a particular fungus [18,19].

3.2. Taxonomy

Trichoderma ganodermatigerum X.Y. An & Y. Li, sp. nov. Figure 3A–L.
MycoBank: MB 843898.
Diagnosis: Phylogenetically, T. ganodermatigerum formed a distinct clade and is related to T. amazonicum (Figure 1). Both T. amazonicum and T. ganodermatigerum form dense concentric rings, pyramidal branching patterns, and branches toward the tip; mycelium grows slowly or does not grow at 35 °C; conidia globose, smooth, and green. As for T. amazonicum, there is no diffusing pigmentation on CMD media and a slightly fruity odor; a brown diffusing pigmentation of the agar is formed in some strains on PDA media [50]. Phylogenetic analysis of TEF1 and RPB2 gene sequences also revealed that T. ganodermatigerum was phylogenetically distinct not only from T. amazonicum but also from other previously reported Trichoderma species.
Etymology: The name refers to the host genus “Ganoderma” from which it was isolated.
Typification: CHINA. Jilin Province, Panshi City, Songshan County, from Ganoderma sichuanense, alt. 310 m, 126°56′ E, 42°77′ N, 18 August 2021, Xiaoya An, HMJAU59014, preserved in Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal Fungi of Jilin Agricultural University. Ex-type culture CCMJ5245. Sexual morph: Undetermined. (ITS: ON399102, TEF1: ON567195, and RPB2: ON567189).
Teleomorph: Unknown.
Description: The optimum temperature was 25 °C, and the colony radius on CMD was 7–9 mm at 15 °C, 19–23 mm at 20 °C, 43–52 mm 25 °C, and 32–36 mm at 30 °C, with no growth at 35 °C, and mycelium covering the plate after ten days at 25 °C (Figure 3E). Colony hyaline, thin, and radiating, white in the initial stage, and gradually turned to light green with slight zonate. Mycelia were sparse and delicate, hard to be observed, and aerial hyphae were inconspicuous. Conidiation starting after six days, formed in pustules. Pustules were spreading near the original inoculum or at the edge of the colony, distributed loosely in the plate, white in the initial stage and then turned green. No chlamydospores were observed. No distinct odor and no diffusing pigment were observed.
Colony radius on SNA after 72 h 5–8 mm at 15 °C,13–15 mm at 20 °C, 42–43 mm at 25 °C, and 25–28 mm at 30 °C, and can hardly see the growth at 35 °C. Mycelium covering the plate after six days at 25 °C (Figure 3F). Colony hyaline, thin, irregular, surface mycelium scant. Aerial hyphae are inconspicuous and short. Conidiation starting after three days, formed in loose pustules. Pustules initially white, loose distribution, later turn aggregated and green. No chlamydospores were observed. No distinct odor and no diffusing pigment were observed.
On PDA, the colony radius was 9–12 mm at 15 °C, 22–28 mm at 20 °C, 38–44 mm at 25 °C, and 30–40 mm at 30 °C, with no growth at 35 °C after 72 h, and mycelium covering the plate after 5–6 days at 25 °C (Figure 3D). The colony was circular, spreading in several concentric rings; aerial hyphae were common, dense, and green; the margin was relatively loose and whitish under the alternative light situations. However, mycelia were aerated and white, and only green appeared near the inoculation site under the condition of total darkness. Conidiation starting after 3–4 days, formed on aerial hyphae, spreading in a circle around the original inoculum. Conidiophores are typically tree-like, straight, or slightly curved, comprising a distinct main axis with side branches paired or unilateral and often terminating in whorls of 3–4 divergent phialides, rarely with a terminal solitary phialide (Figure 3G–J), branches densely disposed, arising at mostly vertical angles upwards, rebranching 1–3 times; the distance between two neighboring branches is (6.6–) 10.0–30.0 (–35.6) μm. Phialides formed paired or in whorls of 3–5, lageniform, spindly, usually arising at an acute angle to the axis, rarely solitary (Figure 3F), (1.1–) 2.8–12.3 (–16) μm× (0.2–) 1.9–3.4 (–3.6) μm, l/w ratio (1.6–) 1.7–5.9 (–7.0), (0.2–) 1.4–2.6 (–2.8) μm wide at the base. Conidia one-celled, green, smooth-walled, globose to subglobose, sometimes ellipsoid, (3.4–) 3.6–4.8 (–5.3) μm× (2.9–) 3.2–4.3 (–4.6) μm, l/w ratio 1.1–1.5. No chlamydospores were observed. No distinct odor and no diffusing pigment were observed.
Distribution: Jilin, Shandong, and Heilongjiang Provinces, China.
Additional specimen examined: China, Jilin Province, Panshi city, Songshan County, from Ganoderma sichuanense, alt. 310 m, 126°56′ E, 42°77′ N, 11 Oct. 2021, Xiaoya An, HMJAU59013.
Notes: Fungicolous on the fruiting body of G. sichuanense in terrestrial habitats. It produces extremely tree-like main axes and branches and green, globose conidia (Figure 3N). The results of the phylogenetic tree strongly support its status as a new taxon (Figure 1), indicating its affinity to the Harzianum clade [16]. The species was related to T. amazonicum and T. pleuroticola. Regarding T. amazonicum, it is a host-specific endophyte and might have potential for biocontrol of Hevea diseases [50]. Phylogenetically, T. ganodermatigerum is related to T. pleuroticola in the mycoparasite group. Morphologically, both species grow rapidly and form broad concentric rings on PDA. Conidiation formed small pustules, and the green spores cause the colony to change from light to dark green [120]. The difference is that the new species starts with white, aerial mycelia and spores are more spherical or nearly spherical, with obvious green color, while the spores of T. pleuroticola are light green, subglobose to broadly ellipsoidal conidia, slightly smaller than T. ganodermatigerum, and reported more on Pleurotus ostreatus, Pleurotus eryngii var. ferulae, Lentinula edodes, and Cyclocybe aegerita [69,73,83,120].
Trichoderma koningiopsis Samuels, Carm. Suárez & H.C. Evans 2006.
Description: Fungicolous, colonized the fruiting body of G. sichuanense, causing green mold disease and occurring mostly from June to September. It is very difficult to distinguish the mycelium in the early stage, and only scattered spots present under the cap. Then, white mycelium appeared, with radiating growth. The edge of the colony is often accompanied by a yellow or brown line. A large number of green spores were produced in the late stage. Young basidiomes were inoculated with T. koningiopsis, which reproduced the original signs; the same pathogen was isolated again from the diseased fruitbody.
On PDA, the colony was radial, first whitish, became dark green with fluffy hyphae after ten days. Aerial hyphae were common and dense, but no concentric rings were observed. Mycelia often appear white in complete darkness, and light stimulates spore production, resulting in a green colony. Conidia formed in pustules, spreading near the original inoculum, white, turning green later. On CMD, mycelium covering the plate after ten days at 25 °C, loose and slim, aerial hyphae were absent. Conidia were formed in pustules, which were only produced at the edge of a colony. On SNA media, concentric rings of light yellow or green appeared, and spores were produced in four days. Conidiophore branches arose at right angles, and primary branches arose singly or in pairs. Conidia were ellipsoidal to oblong-shaped, green, 2.8–7.3 × 2.5–7.0 µm. No chlamydospores, no distinct odor, and no diffusing pigment were observed.
Material examined: CHINA, Jilin Province, on a fruiting body of Ganoderma, 4 August 2020; Xiaoya An, HMJAU59012, living culture CCMJ5253, CCMJ5254 (ITS: ON385996, ON385947; TEF1: ON567187, ON567188, and RPB2: ON567201, ON567202, respectively).
Notes: Trichoderma koningiopsis is found throughout tropical America, as well as East Africa, Europe, Canada, and eastern North America [23]. This species is mainly found in soil, twigs, and decayed leaves, and the sexual type is mostly found in wood. At present, T. koningiopsis has been reported to cause green mold of Phaiius rubrovolvata [91], and to our knowledge, this is the first time that it has caused green mold on G. sichuanense. Our sequences had high similarity to the T. koningiopsis sequence after BLAST, and the results of the phylogenetic tree also confirmed the correctness of the classification (Figure 2).

4. Discussion

Edible and medicinal mushrooms have become a very important crop and are grown commercially in many countries [1,121], but the production, including the yield and quantity, is challenged by fungal diseases [2,24]. Trichoderma ganodermatigerum is a new species of Trichoderma. The results from the phylogenetic analyses separate the new species from other closely related and morphologically similar species. The sequences indicate it belongs to the Harzianum clade. To date, more than forty Trichoderma species have been reported to be associated with mushroom green mold disease. Trichoderma atroviride, T. harzianum, T. koningii, T. longibrachiatum, T. pseudokoningii, and T. viride are the six most commonly cited species causing disease on edible mushrooms (Table 2), all of which could infect six to eleven species of cultivated mushrooms [61,64,68,73,83,91,119,122,123]. Before this study, there were seven known species that could cause G. sichuanense diseases, namely, T. koningii, T. longibrachiatum, T. pseudokoningii, T. viride, T. atrobrunneum, T. ganodermatis [47], and T. hengshanicum [87], while T. orientale can cause disease on G. applanatum [124].
Trichoderma green mold infection in edible basidiomycetes has a long history [125]. There are many types of interactions between mushrooms and Trichoderma [126,127,128,129]. Similar to T. aggressivum, the causal agent of Agaricus green mold disease [130], no obvious biting phenomenon was observed between pathogen and mushroom in this study. Through SEM observation, in the interaction zone between G. sichuanense and T. ganodermatigerum, the tissue surface of Ganoderma became uneven with irregular holes (Figure 3K), the pores on the Ganoderma spores became larger, and the double-layer structure was damaged, resulting in spore invagination (Figure 3L), which was similar to the interaction between Trichoderma and shiitake [83]. We can at least suspect that the cell-wall-degrading enzymes play an important role in the process according to the symptoms of soft tissue with holes or even oozing liquid of Ganoderma. In addition, T. songyi could have great biological potential because it is closely related to the biological agents (Figure 2, Clade II).
The application of the Trichoderma species as biocontrol agents began in 1934 when Weindling first discovered that Trichoderma could be parasitic on the hyphae of Rhizoctonia solani, and since then, an increasing amount of research has focused on this field [131]. Because many Trichoderma species are symbiotic and fungal parasitoids, they need to produce degradation enzymes or secondary metabolites to obtain nutrients from the host, so they have been developed as biocontrol agents for plant diseases [50,55,112,132,133]. Among the species associated with mushrooms, nine species are used as biological agents already. Trichoderma koningiopsis, the new pathogen for G. sichuanense in this study, has been a biocontrol agent for a long time [134]. Since T. ganodermatigerum can infect cultivated Ganoderma, leading to growth stagnation or the cessation of sporulation of Ganoderma, it could be a potential biocontrol agent for plant disease. Therefore, the parasitic characteristics and compounds should be further studied.

Author Contributions

X.-Y.A., D.L. and Y.L. conceived and designed the study. X.-Y.A., G.-H.C. and X.-F.L. collected specimens from China. X.-Y.A., G.-H.C. and H.-X.G. generated the DNA sequence data, checked the specimens, and analyzed the data. X.-Y.A., Y.Y., D.L. and Y.L. checked issues related to nomenclatural articles. X.-Y.A. wrote the manuscript draft. X.-Y.A., G.-H.C., H.-X.G., D.L. and Y.L. revised the draft, and all authors approved the final manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the National Natural Science Foundation of China (No. U20A2046), China Agriculture Research System (No. CARS-20), Central Public-interest Scientific Institution Basal Research Fund (No.1630042022003), the Creation of Ganoderma Germplasm resources and breeding and development of new varieties under the grant (No. GF20190034), Central Public-interest Scientific Institution Basal Research Fund (No. 1630042022020), and Overseas Expertise Introduction Project for Discipline Innovation (111 Center) (No. D17014).

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Acknowledgments

We would like to express our gratitude to the staff of the Engineering Research Center of Edible and Medicinal Fungi, Ministry of Education, Jilin Agricultural University, including Lan Yao, Yu-Kun Ma, and Ye-Tong Li for their help during molecular experiments, Meng-Le Xie for his help during the phylogenetic analyses and taxonomy process, and Chang-Tian Li and Yong-Ping Fu (Plant Protection College of Jilin Agricultural University) for the sample collection in Jilin and Heilongjiang. We also thank Zhuang Li (Plant Protection College of Shandong Agricultural University, China) for his kind help during the sample collection in Shandong.

Conflicts of Interest

The authors declare no conflict of interest.

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Jof 08 00704 g001 550
Figure 1. Phylogeny of Trichoderma using MP analysis based on combined TEF1 and RPB2 sequences. MPBP ≥ 50%, MLBP ≥ 50%, and BIPP ≥ 0.9 are shown on the branches (MPBP/MLBP/BIPP). The sequences in bold are the new species.
Figure 1. Phylogeny of Trichoderma using MP analysis based on combined TEF1 and RPB2 sequences. MPBP ≥ 50%, MLBP ≥ 50%, and BIPP ≥ 0.9 are shown on the branches (MPBP/MLBP/BIPP). The sequences in bold are the new species.
Jof 08 00704 g001
Jof 08 00704 g002 550
Figure 2. Phylogeny of Trichoderma associated with mushrooms using MP analysis based on concatenated TEF1 and RPB2 sequences. Branches are labeled with MPBP ≥ 50% and MLBP ≥ 50%. The biological agents are marked in red, and the new sequences in this study are in bold.
Figure 2. Phylogeny of Trichoderma associated with mushrooms using MP analysis based on concatenated TEF1 and RPB2 sequences. Branches are labeled with MPBP ≥ 50% and MLBP ≥ 50%. The biological agents are marked in red, and the new sequences in this study are in bold.
Jof 08 00704 g002
Jof 08 00704 g003 550
Figure 3. Morphological characteristics of T. ganodermatigerum. (A–C) diseased fruitbody; (D–F) colony on PDA, CMD, and SNA; (G–J) conidiophores and phialides; (K,L) conidia; (M–P) interactions of G. sichuanense and T. ganodermatigerum; (M) Trichoderma hyphae and conidia are filled in the Ganoderma tissue, causing the tissue to become rough or even depressed; (N) Trichoderma hyphae covered with Ganoderma tissue; (O) clinged Trichoderma hyphae and healthy Ganoderma spores; (P) abnormal Ganoderma spores in diseased tissue. Bars: G, Q = 20 µm; H–J, M–P = 10 µm; K = 50 µm; L = 5 µm. The yellow arrows indicate the tissues and spores of G. sichuanense, and the red arrows indicate the hyphae and spores of T. ganodermatigerum.
Figure 3. Morphological characteristics of T. ganodermatigerum. (A–C) diseased fruitbody; (D–F) colony on PDA, CMD, and SNA; (G–J) conidiophores and phialides; (K,L) conidia; (M–P) interactions of G. sichuanense and T. ganodermatigerum; (M) Trichoderma hyphae and conidia are filled in the Ganoderma tissue, causing the tissue to become rough or even depressed; (N) Trichoderma hyphae covered with Ganoderma tissue; (O) clinged Trichoderma hyphae and healthy Ganoderma spores; (P) abnormal Ganoderma spores in diseased tissue. Bars: G, Q = 20 µm; H–J, M–P = 10 µm; K = 50 µm; L = 5 µm. The yellow arrows indicate the tissues and spores of G. sichuanense, and the red arrows indicate the hyphae and spores of T. ganodermatigerum.
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Table
Table 1. Strain information and GenBank accession numbers of sequences used for phylogenetic analyses for new species.
Table 1. Strain information and GenBank accession numbers of sequences used for phylogenetic analyses for new species.
SpeciesStrainsGenBank Accession NumberReferences
TEF1RPB2
T. afarasinGJS 99-227AF348093—[45]
T. afroharzianumLESF229KT279013KT278945[46]
T. afroharzianumGJS04-186 (T)FJ463301FJ442691In GenBank
T. aggregatumHMAS248864KY688063KY688002[47]
T. aggressivumCBS100525AF534614AF545541[48]
T. aggressivumDAOM222156AF348098FJ442752[45]
T. alniCPK2494EU498313EU498350[49]
T. alniCBS120633 = CPK1982 (T)EU498312EU498349[49]
T. alpinumHMAS248870KY688017KY687963[47]
T. alpinumHMAS248821 (T)KY688012KY687958[47]
T. amazonicumIB95HM142377HM142368[50]
T. asperellumCBS433.97 = TR3 (T)AF456907EU248617[51]
T. atrobrunneumS3KJ665376KJ665241[20]
T. atrobrunneumGJS92-110 (T)AF443942—[16]
T. atrogelatinosumCBS237.63 (T)—KJ842201In GenBank
T. azevedoiCEN1403MK696638MK696800[52]
T. azevedoiCEN1422MK696660MK696821[52]
T. bannaenseHMAS248865KY688038KY688003[47]
T. bannaenseHMAS248840 (T)KY688037KY687979[47]
T. breveHMAS248845KY688046KY687984[47]
T. breveHMAS248844 (T)KY688045KY687983[47]
T. brunneovirideCBS121130 = CPK2014EU498316EU498357[49]
T. camerunenseGJS99-231AF348108—[45]
T. camerunenseGJS99-230 (T)AF348107—[45]
T. catoptronGJS02-76 = CBS114232 (T)AY391963AY391900[53]
T. christianiCBS132572 = S442 (T)KJ665439KJ665244[20]
T. cinnamomeumGJS97-237 (T)AY391979AY391920[53]
T. compactumCBS121218KF134798KF134789[54]
T. concentricumHMAS248858KY688028KY687997[47]
T. concentricumHMAS248833 (T)KY688027KY687971[47]
T. endophyticumDIS220JFJ463330FJ442690[55]
T. endophyticumDIS221EFJ463316FJ442775In GenBank
T. epimycesCPK1980EU498319EU498359[49]
T. epimycesCBS120534 = CPK1981 (T)EU498320EU498360[49]
T. ganodermatigerumCCMJ5245 (T)ON567195ON567189This study
T. ganodermatigerumCCMJ5246ON567196ON567190This study
T. ganodermatigerumCCMJ5247ON567197ON567191This study
T. ganodermatigerumCCMJ5248ON567198ON567192This study
T. ganodermatigerumCCMJ5249ON567199ON567193This study
T. ganodermatigerumCCMJ5250ON567200ON567194This study
T. guizhouenseS278KF134799KF134791[54]
T. guizhouenseS628KJ665511KJ665273[20]
T. harzianumGJS05-107FJ463329FJ442708In GenBank
T. harzianumGJS04-71FJ463396FJ442779In GenBank
T. harzianumThaum12MT081433MT118248In GenBank
T. harzianumCBS226.95 (T)AF534621AF545549[48]
T. hausknechtiiHypo649 = CBS133493 (T)KJ665515KJ665276[20]
T. helicolixiiS640 = CBS133499 (T)KJ665517KJ665278[20]
T. hengshanicumHMAS248853KY688055KY687992[47]
T. hengshanicumHMAS248852 (T)KY688054KY687991[47]
T. hirsutumHMAS248859KY688030KY687998[47]
T. hirsutumHMAS248834 (T)KY688029KY687972[47]
T. ingratumHMAS248824KY688019KY687964[47]
T. ingratumHMAS248873KY688022KY688010[47]
T. ingratumHMAS248822 (T)KY688018KY687973[47]
T. inhamatumCBS273.78 (T)AF348099FJ442725[45]
T. italicumS131 = CBS132567 (T)KJ665525KJ665282[20]
T. lentiformeDIS167CFJ463309FJ442689In GenBank
T. lentiformeGJS98-6 (T)AF469195—[16]
T. liberatumHMAS248832KY688026KY687970[47]
T. liberatumHMAS248831 (T)KY688025KY687969[47]
T. linzhienseHMAS248874KY688048KY688011[47]
T. linzhienseHMAS248846 (T)KY688047KY687985[47]
T. lixiiCBS110080 = GJS97-96FJ716622KJ665290[20]
T. neocrassumDAOM164916 = CBS336.93 (T)AF534615AF545542[48]
T. neotropicaleLA11HQ022771—[56]
T. peberdyiCEN1387MK696619MK696781[52]
T. peberdyiCEN1388MK696620MK696782[52]
T. pleuroticolaT1295EU279973—[57]
T. pleuroticolaCBS124383 (T)HM142381HM142371[50]
T. pleurotiCBS124387 (T)HM142382HM142372[50]
T. polyporiHMAS248855KY688058KY687994[47]
T. polyporiHMAS248861KY688059KY688000[47]
T. priscilaeS129KJ665689KJ665332[20]
T. pseudodensumHMAS248829KY688024KY687968[47]
T. pseudodensumHMAS248828 (T)KY688023KY687967[47]
T. pseudogelatinosumTUFC60186 (T)JQ797397JQ797405[58]
T. pyramidaleS573KJ665698—[20]
T. pyramidaleS73 = CBS135574 (T)KJ665699KJ665334[20]
T. rifaiiDIS337FFJ463321FJ442720In GenBank
T. rifaiiDIS355B (T)FJ463324—In GenBank
T. simmonsiiGJS90-22AY391984AY391925[53]
T. simmonsiiGJS92-100AF443937FJ442710[16]
T. simmonsiiGJS91-138AF443935FJ442757[16]
T. simplexHMAS248860KY688042KY687999[47]
T. simplexHMAS248842 (T)KY688041KY687981[47]
T. solumHMAS248848KY688050KY687987[47]
T. solumHMAS248847 (T)KY688049KY687986[47]
T. spiraleDAOM183974EU280049—[57]
T. spiraleLESF107KT279022KT278956[46]
T. stramineumGJS02-84 = CBS114248 (T)AY391999AY391945[53]
T. tawaGJS97-174 = CBS114233 (T)AY392004AY391956[53]
T. tomentosumS33KF134801KF134793[54]
T. tomentosumDAOM178713A (T)AF534630AF545557[48]
T. velutinumDAOM230013 = CPK298AY937415KF134794[59]
T. virensDIS162FJ463367FJ442696In GenBank
T. zayuenseHMAS248836KY688032KY687975[47]
T. zayuenseHMAS248835 (T)KY688031KY687974[47]
New sequences are shown in bold. The type sequences are marked with (T).
Table
Table 2. Isolates and GenBank accession numbers of Trichoderma species associated with green mold on mushrooms.
Table 2. Isolates and GenBank accession numbers of Trichoderma species associated with green mold on mushrooms.
SpeciesHost RangeIsolatesGenBank Accession NumberReferences
TEF1RPB2
T. aggressivumAgaricus bisporusCBS100525AF534614AF545541[48]
T. aggressivum
f. aggressivum		Agaricus bisporusGJS99-30AF348109—[60]
DAOM222156AF348098FJ442752[45]
T. aggressivum
f. europaeum		Agaricus bisporusCBS100526 (T)KP008993KP009166[45]
—TRS27KP008994KP009163In GenBank
—CBS435.95KP008998KP009169In GenBank
T. alniMacrotyphula cf. contortaCBS120633EU498312EU498349[49]
CPK2494EU498313EU498350
T. asperellumPleurotus ostreatusT11 (ACCC32725)MF049065—[61]
Pleurotus eryngii———[62]
—CGMCC6422KF425756KF425755[63]
—CBS433.97 = TR3 (T)AF456907EU248617In GenBank
T. atrobrunneumGanoderma sichuanenseCGMCC3.19070MH464779—[64]
—T17-27MW232537MW232508[65]
T. atroviridePleurotus ostreatusCPK3277EU918154—[66]
Ganoderma sichuanense2015005——[10]
Agaricus bisporusT33——[67]
Lentinula edodesT25——[68]
Pleurotus eryngii———[69]
—PARC1011MT454114MT454130[70]
—PARC1018MT454121MT454137
—DAOM222144AF456889FJ442754[71]
—Th002AB558906AB558915[72]
T. aureoviridePleurotus ostreatusHMAS266607KF923280KF923306[73]
T. austriacumPeziza sp.CBS122494 (T)FJ860619FJ860525[19]
T. capillareAgaricus bisporusCPK2883JN182283JN182312[74]
GJS99-3JN175584JN175529
T. catoptronAphyllophorales s. l.GJS02-76 (T)AY391963AY391900[53]
T. cerinumLentinula edodesS357KF134797KF134788[75]
T. chromospermumblack mycelium and black pyrenomyceteGJS95-196AY391975AY391914[53]
GJS98-73AY391976AY391915
GJS94-68 = CBS114577—AY391913
—HMAS252537KF729986KF730004[25]
—HMAS252539KF923287KF923314
—HMAS252535KF923292KF923315
T. citrinovirideLentinula edodesTAMA0154AB807641AB807653[76]
Pleurotus ostreatusGJS92-8JN175595JN175544[77]
Pleurotus eryngiiGJS01-364AY225860AF545565[69]
Polypore mushroomTAMA0188AB807644AB807656[76]
—HZA9MK850831MK962804[78]
T. epimycesPolyporus umbellatusCPK1980EU498319EU498359[49]
CBS120534 (T)EU498320EU498360
T. erinaceum—DIS7DQ109547EU248604[79]
T. fasciculatumHypocrea ascosporesCBS118.72——[80]
—DAOM172827AF534628AF545555[48]
T. fomiticolaFomes fomentariusCBS121136FJ860639FJ860538[18]
CPK3137FJ860640FJ860539
T. ghanenseAgaricus bisporusNBRC30902AB807638AB807650[76]
T. ganodermatisGanoderma sichuanenseHMAS248856KY688060KY687995[47]
HMAS248869KY688061KY688007[47]
T. ganodermatigerumGanoderma sichuanenseCCMJ5245(T)ON567195ON567189This study
CCMJ5246ON567196ON567190
CCMJ5247ON567197ON567191
CCMJ5248ON567198ON567192
CCMJ5249ON567199ON567193
CCMJ5250ON567200ON567194
T. ghanenseAgaricus bisporusNBRC30902AB807638—[76]
T. hamatumAgaricus bisporusTham20-3——[81]
Lentinula edodes———[82]
—DAOM167057 (T)EU279965AF545548[57]
—Hypo647 = WU31629KJ665513KJ665274[20]
—Hypo648 = CBS132565KJ665514KJ665275[20]
T. harzianumPleurotus ostreatusKACC40558——[66]
Cyclocybe aegeritaJB1——[73]
Lentinula edodesT50——[83]
Pleurotus eryngiiKACC40784——[69]
Pleurotus ostreatus
Agaricus bisporus———[45]
Pleurotus ostreatus———[84]
Polypores/Corticiaceous———[18]
Pleurotus tuoliensis———[85]
Tremella fuciformis
Flammulina filiformis
—CBS226.95AF348101AF545549[48]
—Thaum12MT081433MT118248[86]
—CBS227.95AF348100—[45]
—GJS05-107FJ463329FJ442708In GenBank
—GJS04-71FJ463396FJ442779In GenBank
T. hengshanicumGanoderma sichuanense1009——[87]
—HMAS248852 (T)KY688054KY687991[47]
—HMAS248853KY688055KY687992
T. inhamatumAgaricus bisporusCBS273.78 (T)AF348099FJ442725[81]
Pleurotus tuoliensis———[85]
T. koningiiPleurotus eryngii———[69]
Agaricus bisporus———[88]
Lentinula edodes———[85]
Pleurotus ostreatus
Pleurotus tuoliensis
Flammulina filiformis
Volvariella volvacea
Hypsizygus marmoreus
Ganoderma sichuanenseTFl040917——[75]
Tremella fuciformisTGy040604——
—7723KJ634753KJ634720[89]
—GJS90-18DQ289007EU248600[23]
—CBS979.70AY665703EU248601In GenBank
—S22KC285595KC285749[90]
T. koningiopsisPhaiius rubrovolvataCXYLMN135988MT038997[91]
Ganoderma sichuanenseCCMJ5253ON567187ON567201This study
CCMJ5254ON567188ON567202
T. kunigamenseLentinula edodesTAMA193AB807645AB807657[76]
T. leguminosarumdark corticiaceous fungusS391KJ665548KJ665287[20]
CBS130014KJ665551KJ665288
S503KJ665552KJ665289
T. lieckfeldtiaeMoniliophthora roreriGJS00-14 = CBS123049 (T)EU856326EU883562[92]
T. longibrachiatumPleurotus ostreatusTUFC61535 = CBS816.68(T)EU401591DQ087242[40]
Agrocybe aegeritaJB4——[73]
Lentinula edodesT57——[83]
Ganoderma sichuanenseTFl040921——[75]
Pleurotus eryngii———[93]
Agaricus bisporus———[81]
Pleurotus tuoliensis———[85]
Hypsizygus marmoreus
Volvariella volvacea
T. mienumLentinula edodesTUFC61517JQ621975JQ621965[94]
T. orientaleGanoderma applanatumLESF516KT279041KT278976[46]
Ganoderma applanatumLESF540KT279042KT278977
Ganoderma applanatumLESF544KT279043KT278978
Ganoderma applanatumTRS707KP008888KP009202
T. oblongisporumLentinula edodesT37——[83]
—DAOM167085AF534623AF545551[48]
T. parareeseiPleurotus eryngiiTAMA0153AB807640AB807652[76]
T. parestonicaHymenochaete tabacinaCBS120636 (T)FJ860667FJ860565[18]
T. pleuroticolaPleurotus ostreatusCBS124383 (T)HM142381HM142371[66]
CPK2885EU918161EU918141
Pleurotus eryngiiCAF-TP3——[69]
Lentinula edodesT22——[83]
Cyclocybe aegeritaJB7——[73]
—T1295EU279973—[57]
T. pleurotiPleurotus ostreatusKACC44537——[69]
Pleurotus eryngii var. ferulae———[95]
—CBS124387 (T)HM142382HM142372[50]
T. polyporiLentinula edodesHMAS248861KY688059KY688000[47]
Polyporus sp.HMAS248855 (T)KY688058KY687994
T. polysporumLentinula edodes———[96]
—8232KJ634779KJ634746[89]
—8147KJ634771KJ634738
T. priscilaeCrepidotus sp.S168 = CBS131487 (T)KJ665691KJ665333[20]
Stereum sp.S129KJ665689KJ665332
—HMAS245002KT343760KT343764In GenBank
T. protopulvinatumFomitopsis pinicolaCPK2434FJ860677FJ860574[18]
T. pulvinatumFomitopsis pinicolaCBS121279FJ860683FJ860577[18]
T. pseudokoningiiLentinula edodesDUCC4021KX431217—[77]
Cyclocybe aegeritaTGc050619——[75]
Ganoderma sichuanenseTFl040926——
Pleurotus eryngii———[97]
Flammulina filiformis———[98]
Pleurotus tuoliensis———[85]
Volvariella volvacea
Hypsizygus marmoreus
—DAOM167678AY865641KJ842214[99]
—GJS99-149JN175589JN175536[17]
—GJSNS19JN175588JN175535
T. pseudolacteumLentinula edodesTUFC61496JX238494JX238479[100]
TUFC61502JX238480JX238471
T. samuelsiiHymenochaete sp.S5 = CBS130537JN715651JN715599[101]
S42JN715652JN715598
T. songyiTricholoma matsutakeTC556KX266244KX266250[102]
TC480KX266243KX266249
T. stilbohypoxyliStilbohypoxylon moelleriHypo256 = CPK1977FJ860702FJ860592[23]
T. stromaticumAgaricus bisporusGJS97-181AY937447HQ342227[59]
—GJS07-88HQ342195HQ342258[103]
—GJS03-47HQ342201HQ342264
—GJS00-107HQ342202HQ342265
T. sulphureumLaetiporus sulphureusCBS119929FJ860710FJ179620[18]
CPK1593FJ860709FJ860599
Thelephora sp.GJS95-135 = CBS114237AY392006AY391958[53]
T. tsugarenseLentinula edodesTAMA203 (T)AB807647AB807659[76]
T. virideLentinula edodesT13——[83]
Pleurotus ostreatus———[82]
Tremella fuciformisTGc040905——[75]
Ganoderma sichuanenseTFl080706——[75]
Flammulina filiformisTFj10010——[75]
Cyclocybe aegeritaTGc040905——[75]
Phallus indusiatusTFl080706——[75]
Tremella fuciformisTGc040905——[75]
Agaricus bisporus———[88]
Pleurotus eryngii—— [69]
—TRS575KP008931KP009081In GenBank
—LESF115KT278989KT278921[46]
T. virensAgaricus bisporus———[88]
Pleurotus eryngii———
—DIS162FJ463367FJ442696In GenBank
—DIS328AFJ463363FJ442738In GenBank
T. cf. virensPleurotus eryngiiKACC40783——[69]
Pleurotus ostreatusTUCIM2558KX655776—[104]
T. viridariumSteccherinum ochraceumGJS89-142AY376049EU241495[51]
Nemania sp.GJS98-182DQ307511EU252011[23]
Protocrea farinosa—CBS121551EU703889EU703935[105]
Protocrea pallida—CBS121552EU703897EU703944
The type sequences are marked with (T), the new sequences are shown in bold.
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MDPI and ACS Style

An, X.-Y.; Cheng, G.-H.; Gao, H.-X.; Li, X.-F.; Yang, Y.; Li, D.; Li, Y. Phylogenetic Analysis of Trichoderma Species Associated with Green Mold Disease on Mushrooms and Two New Pathogens on Ganoderma sichuanense. J. Fungi 2022, 8, 704. https://doi.org/10.3390/jof8070704

AMA Style

An X-Y, Cheng G-H, Gao H-X, Li X-F, Yang Y, Li D, Li Y. Phylogenetic Analysis of Trichoderma Species Associated with Green Mold Disease on Mushrooms and Two New Pathogens on Ganoderma sichuanense. Journal of Fungi. 2022; 8(7):704. https://doi.org/10.3390/jof8070704

Chicago/Turabian Style

An, Xiao-Ya, Guo-Hui Cheng, Han-Xing Gao, Xue-Fei Li, Yang Yang, Dan Li, and Yu Li. 2022. "Phylogenetic Analysis of Trichoderma Species Associated with Green Mold Disease on Mushrooms and Two New Pathogens on Ganoderma sichuanense" Journal of Fungi 8, no. 7: 704. https://doi.org/10.3390/jof8070704

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