Research Article |
Corresponding author: Michael J. Wingfield ( mike.wingfield@fabi.up.ac.za ) Academic editor: Marc Stadler
© 2018 Nam Q. Pham, Irene Barnes, ShuaiFei Chen, Thu Q. Pham, Lorenzo Lombard, Pedro W. Crous, Michael J. Wingfield.
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:
Pham NQ, Barnes I, Chen S, Pham TQ, Lombard L, Crous PW, Wingfield MJ (2018) New species of Cylindrocladiella from plantation soils in South-East Asia. MycoKeys 32: 1-24. https://doi.org/10.3897/mycokeys.32.23754
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Cylindrocladiella spp. are widely distributed especially in tropical and sub-tropical regions, where they are mainly known as saprobes although some species are plant pathogens. Very little is known about these fungi in South-East Asia. The aim of this study was to identify a collection of Cylindrocladiella isolates from soils collected in forest nurseries and plantations in Vietnam and Malaysia. This was achieved using DNA sequence comparisons and morphological observations. The study revealed two previously described species, Cy. lageniformis and Cy. peruviana as well as five novel taxa, described here as Cy. arbusta sp. nov., Cy. malesiana sp. nov., Cy. obpyriformis sp. nov., Cy. parvispora sp. nov. and Cy. solicola sp. nov. A relatively small collection of isolates from a limited geographic sampling revealed an unexpectedly high level of Cylindrocladiella diversity suggesting that many more species in this genus await discovery in South-East Asia.
multigene phylogeny, plantation forestry, taxonomy
Cylindrocladiella (Hypocreales, Nectriaceae) are soil-borne fungi that have commonly been confused with the asexual morph of the closely related genus Calonectria (
Species of Cylindrocladiella are distributed globally, especially in the tropical, sub-tropical and temperate regions of the world (
Thirteen species of Cylindrocladiella have been reported from South-East Asia from Indonesia and Thailand (
In order to provide a better understanding about the diversity of Cylindrocladiella species in South-East Asia, this study aimed at identifying a collection of Cylindrocladiella isolates obtained from soils collected in plantations and nurseries in Malaysia and Vietnam. This was achieved using multigene sequence comparisons and morphological observations.
Soil samples were collected from various plantations and nurseries in Malaysia and Vietnam and baited with germinating alfalfa (Medicago sativa) seeds as described by
Seven-day-old fungal cultures grown on MEA at 25 °C were used for DNA extraction using Prepman® Ultra Sample Preparation Reagent (Thermo Fisher Scientific, Waltham, MA, USA) following the protocols provided by the manufacturer. Four loci were amplified and sequenced including the internal transcribed spacer (ITS) region using primers ITS1F (
The PCR reactions were conducted as described by
Raw sequences were assembled and edited using Geneious v. 7.0 (
Maximum Parsimony (MP) and Maximum Likelihood (ML) analyses were performed on data sets for each gene region and the combined data set. For MP, analyses were conducted using PAUP v. 4.0b10 (
Morphological characteristics were assessed using single hyphal tip cultures on synthetic low-nutrient agar (SNA; Nirenburg 1981) and incubated at 25 °C for 3–7 d. In some cases, pieces of carnation leaf were added to the media to induce sporulation. Fungal structures were studied by mounting in 80 % lactic acid on glass sides and examined using a Nikon H550L microscope (Nikon, Japan). Thirty to fifty measurements were made for all taxonomically informative characters depending on their availability. The 95 % confidence levels were determined and extremes of conidial measurements are given in parentheses. For all other fungal structures, only extremes are presented. Colony colour and morphology were assessed using 7-d-old cultures on MEA grown at 25 °C using the colour charts of
Nineteen isolates in total were obtained from soil baits. Of these, 15 were from Vietnam (nine from Tuyen Quang, four from Nghe An, one from Vinh Phuc and one from Hanoi) and four were from Sabah, Malaysia. The majority (16) of the isolates were from soils collected from Acacia plantations (Table
Collection details and GenBank accessions of Cylindrocladiella isolates included in the phylogenetic analysis.
Species | Isolate number1,3 | Substrate | Locality | Genbank accession2 | References | |||
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tub2 | his3 | tef1 | ITS | |||||
Cy. arbusta | CMW 47295T; CBS 143546 | soil in Acacia mangium plantation | Tan Ky, Nghe An, Vietnam | MH016958 | MH016996 | MH016977 | MH017015 | This study |
CMW 47296; CBS 143547 | soil in A. mangium plantation | Tan Ky, Nghe An, Vietnam | MH016959 | MH016997 | MH016978 | MH017016 | This study | |
Cy. camelliae | CPC 234; PPRI 3990; IMI 346845 | Eucalyptus grandis | South Africa | AY793471 | AY793509 | JN099087 | AF220952 |
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CPC 237 | E. grandis | South Africa | JN098749 | JN098839 | JN099090 | JN100573 |
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Cy. clavata | CBS 129563; CPC 17591 | soil | Australia | JN098751 | JN098859 | JN098975 | JN099096 |
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CBS 129564T; CPC 17592 | soil | Australia | JN098752 | JN098858 | JN098974 | JN099095 |
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Cy. cymbiformis | CBS 129553T; CPC 17393 | soil | Australia | JN098753 | JN098866 | JN098988 | JN099103 |
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Cy. elegans | CBS 338.92T; PPRI 4050; IMI 346847 | leaf litter | South Africa | AY793474 | AY793512 | JN099039 | AY793444 |
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CBS 110801; CPC 525 | leaf litter | South Africa | JN098755 | JN098916 | JN099044 | JN100609 |
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Cy. lageniformis | CBS 340.92T; PPRI 4449; UFV 115 | Eucalyptus sp. | Brazil | AY793481 | AY793520 | JN099003 | AF220959 |
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CBS 111060; CPC 1240 | Eucalyptus sp. | South Africa | JN098770 | JN098918 | JN099046 | JN100611 |
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CMW 47419 | soil in E. camaldulensis plantation | Hoang Mai, Nghe An, Vietnam | MH016972 | MH017010 | MH016991 | MH017029 | This study | |
Cy. lanceolata | CBS 129565; CPC 17566 | soil | Australia | JN098788 | JN098939 | JN099069 | JN100632 |
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CBS 129566T; CPC 17567 | soil | Australia | JN098789 | JN098862 | JN098978 | JN099099 |
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Cy. longiphialidica | CBS 129557T; CPC 18839 | soil | Thailand | JN098790 | JN098851 | JN098966 | JN100585 |
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CBS 129558 | soil | Thailand | JN098791 | JN098852 | JN098967 | JN100586 |
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Cy. malesiana | CMW 48276; CBS 143549 | soil in A. mangium plantation | Tawau, Sabah, Malaysia | MH016960 | MH016998 | MH016979 | MH017017 | This study |
CMW 48277; CBS 143550 | soil in A. mangium plantation | Tawau, Sabah, Malaysia | MH016961 | MH016999 | MH016980 | MH017018 | This study | |
CMW 48278T; CBS 143548 | soil in A. mangium plantation | Tawau, Sabah, Malaysia | MH016962 | MH017000 | MH016981 | MH017019 | This study | |
Cy. malesiana | CMW 48279 | soil in A. mangium plantation | Tawau, Sabah, Malaysia | MH016963 | MH017001 | MH016982 | MH017020 | This study |
Cy. microcylindrica | CBS 111794T; ATCC 38571; CPC 2375 | Echeveria elegans | Indonesia | AY793483 | AY793523 | JN099041 | AY793452 |
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Cy. natalensis | CBS 110800; CPC 529 | soil | South Africa | JN098793 | JN098915 | JN099043 | JN100608 |
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CBS 114943T; CPC 456 | Arachis hypogaea | South Africa | JN098794 | JN098895 | JN099016 | JN100588 |
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Cy. nederlandica | CBS 143.95; PD94/1353 | Kalanchoe sp. | The Netherlands | JN098798 | JN098891 | JN099013 | JN099129 |
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CBS 152.91T; PD90/2015 | Pelargonium sp. | The Netherlands | JN098800 | JN098910 | JN099033 | JN100603 |
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Cy. novaezelandica | CBS 486.77T; ATCC 44815; CPC 2397 | Rhododendron indicum | New Zealand | AY793485 | AY793525 | JN099050 | AF220963 |
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Cy. obpyriformis | CMW 47194T; CBS 143552 | soil in Acacia hybrid plantation | Tuyen Quang, Vietnam | MH016965 | MH017003 | MH016984 | MH017022 | This study |
CMW 49940; CBS 143553 | soil in Camellia chrysantha nursery | Tam Dao, Vinh Phuc, Vietnam | MH016966 | MH017004 | MH016985 | MH017023 | This study | |
Cy. parvispora | CMW 47193 | soil in Acacia hybrid plantation | Tuyen Quang, Vietnam | MH016967 | MH017005 | MH016986 | MH017024 | This study |
CMW 47197T; CBS 143554 | soil in Acacia hybrid plantation | Tuyen Quang, Vietnam | MH016968 | MH017006 | MH016987 | MH017025 | This study | |
CMW 47207; CBS 143555 | soil in Acacia hybrid plantation | Tuyen Quang, Vietnam | MH016969 | MH017007 | MH016988 | MH017026 | This study | |
CMW 47208; CBS 143556 | soil in Acacia hybrid plantation | Tuyen Quang, Vietnam | MH016970 | MH017008 | MH016989 | MH017027 | This study | |
CMW 47315 | soil in A. mangium plantation | Son Duong, Tuyen Quang, Vietnam | MH016971 | MH017009 | MH016990 | MH017028 | This study | |
Cy. peruviana | CBS 113022; CPC 4291 | Eucalyptus sp. | South Africa | JN098801 | JN098906 | JN099029 | JN100599 |
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CPC 2404T; IMUR 1843 | ants | Peru | AY793500 | AY793540 | JN098968 | AF220966 |
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CMW 47297 | soil in A. mangium plantation | Tan Ky, Nghe An, Vietnam | MH016973 | MH017011 | MH016992 | MH017030 | This study | |
CMW 47304 | soil in A. mangium plantation | Son Duong, Tuyen Quang, Vietnam | MH016974 | MH017012 | MH016993 | MH017031 | This study | |
CMW 47333 | soil in A. mangium plantation | Son Duong, Tuyen Quang, Vietnam | MH016975 | MH017013 | MH016994 | MH017032 | This study | |
Cy. peruviana | CMW 47416 | soil | Bac Tu Liem, Hanoi, Vietnam | MH016976 | MH017014 | MH016995 | MH017033 | This study |
Cy. pseudocamelliae | CBS 129555T; CPC 18825 | soil | Thailand | JN098814 | JN098843 | JN098958 | JN100577 |
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CBS 129556; CPC 18832 | soil | Thailand | JN098815 | JN098846 | JN098961 | JN100580 |
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Cy. solicola | CMW 47198T; CBS 143551 | soil in Acacia hybrid plantation | Tuyen Quang, Vietnam | MH016964 | MH017002 | MH016983 | MH017021 | This study |
Cy. variabilis | CBS 375.93; IMI 317057 | Mangifera indica | India | JN098836 | JN098881 | JN099000 | JN099119 |
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CBS 129561T; CPC 17505 |
soil | Australia | JN098719 | JN098950 | JN099080 | JN100643 |
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Approximately 500–570 bases were obtained for each of the his3, tef1, tub2 and ITS loci. For the ML analyses of each individual data sets, the TIM2+G model was selected for his3; GTR+G model for tef1; TrN+I+G for tub2 and the K80+I+G for ITS. The ML tree of each individual gene region with bootstrap support values of both the ML and MP analyses are presented in Suppl. materials
The combined data set of his3, tef1, tub2 and ITS, included 44 ingroup taxa and two outgroup taxa. The data set consisted of 2054 characters, of which 640 were parsimony-informative and 1414 characters were excluded. The MP analysis yielded 1000 trees (TL = 1414; CI = 0.691; RI = 0.880; RC = 0.608; HI = 0.309). The TIM2+I+G model was selected for the combined data set for the ML analyses. The ML tree with bootstrap support values of both the ML and MP analyses is presented in Figure
In the phylogenetic tree (Figure
Phylogenetic tree based on maximum likelihood (ML) analysis of a combined data set of his3, tef1, tub2 and ITS sequence alignments. Bootstrap value ≥ 60 % for maximum parsimony (MP) and ML analyses are indicated at the nodes. Bootstrap values lower than 60 % are marked with “*” and absent are marked with “–”. Isolates representing ex–type material are marked with “T” and isolates collected in this study are highlighted in bold. Calonectria brachiatica (CMW 25307) and Calonectria pauciramosa (CMW 5683) represent the outgroups.
Morphological comparisons and phylogenetic inference showed that 19 Cylindrocladiella isolates represented five novel species along with two previously described species, Cy. lageniformis (CMW 47419) and Cy. peruviana (CMW 47297, CMW 47304, CMW 47333, CMW 47416). The novel taxa are provided with names in Cylindrocladiella and their important morphological characteristics are compared in Table
Comparisons of morphological characteristics of Cylindrocladiella spp. included in this study.
Species | Stipe extension | Vesicle | Macroconidia | Subverticillate conidiophores | References | ||
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Length (µm) | Diam (µm) | Shape | Size (µm) | Average (µm) | |||
Cy. arbusta | 93–139 | 4–5.5 | obpyriform to lanceolate | (8.5–)10–12 (–13.5) × 2–3 | 11 × 2.5 | moderate | This study |
Cy. malesiana | 114.5–144.5 | 4.5–6 | fusoid to lanceolate | (10–)11–13(–13.5) × (1.5–)2–2.5 | 12 × 2 | abundant | This study |
Cy. microcylindrica | 70–130 | 3–4 | cylindrical to lanceolate | (10–)12–14 (–15) × 2(–3) | 12.5 × 2 | abundant |
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Cy. natalensis | 82–127 | 6–8 | ellipsoidal to fusoid | (12–)14–16 (–17) × 2–3 | 15× 3 | moderate |
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Cy. obpyriformis | 86.5–150 | 4–7 | obpyriform | (9–)11–13(–15) × 2–3(–3.5) | 12 × 2.5 | abundant | This study |
Cy. parvispora | 112.5–141 | 4.5–6.5 | fusoid to cylindrical | (8–)10– 12 (–13) × 2–2.5 | 11 × 2 | moderate | This study |
Cy. solicola | 93.5–170 | 3.5–6.5 | broadly clavate to lanceolate to fusiform | (10.5–)12.5–14.5(–15.5) × 2–3 | 13.5 × 2.5 | abundant | This study |
Name refers to a plantation and the environment where this fungus was isolated.
VIETNAM. Nghe An Province: Tan Ky, from soil in Acacia mangium plantation, Nov. 2013, N.Q. Pham & T.Q. Pham, herbarium specimen of dried culture, PREM 62159 (holotype), CMW 47295 = CBS 143546 (ex-type culture).
Sexual morph not observed. Conidiophores dimorphic, penicillate and subverticillate, mononematous and hyaline. Penicillate conidiophores comprising a stipe, a penicillate arrangement of fertile branches, a stipe extension and a terminal vesicle; stipe septate, hyaline, smooth, 116–166.5 × 4–5 µm; stipe extension aseptate, straight, 93–139 µm long, thick-walled with one basal septum, terminating in thin-walled, obpyriform to lanceolate vesicles, 4–5.5 µm wide. Penicillate conidiogenous apparatus with primary branches aseptate, 15–28.5 × 2.5–5 µm, secondary branches aseptate, 12–22.5 × 2.5–3.5 µm, each terminal branch producing 2–4 phialides; phialides doliiform to reniform to cymbiform, hyaline, aseptate, 10–18 × 2–3 µm, apex with minute periclinal thickening and collarette. Subverticillate conidiophores in moderate numbers, comprising of a septate stipe and primary branches terminating in 2–4 phialides; primary branches straight, hyaline, 0–1-septate, 25–31 × 2.5–3.5 µm; phialides cymbiform to cylindrical, hyaline, aseptate, 16.5–30.5 × 2–3.5 µm, apex with minute periclinal thickening and collarette. Conidia cylindrical, rounded at both ends, straight, 1-septate, (8.5–)10–12(–13.5) × 2–3 µm (av. = 11 × 2.5 µm), frequently slightly flattened at the base, held in asymmetrical clusters by colourless slime.
Colonies white to buff on the surface and salmon to sienna in reverse on MEA after 7 d; smooth margins; extensive aerial mycelium in the middle and the margins; chlamydospores moderate, arranged in chains. Optimal growth temperature at 25 °C, no growth at 5 °C and 35 °C; after 7 d, colonies at 10 °C, 15 °C, 20 °C, 25 °C and 30 °C reached 3.5 mm, 27.7 mm, 49.2 mm, 67.9 mm and 52.7 mm, respectively.
VIETNAM, Nghe An Province: Tan Ky, from soil in Acacia mangium nursery, Nov. 2013, N.Q. Pham & T.Q. Pham, PREM 62160, culture CMW 47296 = CBS 143547.
Nghe An, Vietnam.
Cylindrocladiella arbusta is phylogenetically closely related to Cy. natalensis, Cy. obpyriformis and Cy. parvispora. The stipe extensions of Cy. arbusta are longer than those of Cy. natalensis and shorter than those of Cy. obpyriformis and Cy. parvispora. Conidia of Cy. arbusta are shorter than those of Cy. natalensis and Cy. obpyriformis (Table
Name refers to Malaysia, the country where this species was first collected.
MALAYSIA. Sabah State: Tawau, Brumas, from soil in Acacia mangium plantation, Mar. 2013, M.J. Wingfield, herbarium specimen of dried culture, PREM 62161 (holotype), CMW 48278 = CBS 143548 (ex-type culture).
Sexual morph not observed. Conidiophores dimorphic, penicillate and subverticillate, mononematous and hyaline. Penicillate conidiophores comprising a stipe, a penicillate arrangement of fertile branches, a stipe extension and a terminal vesicle; stipe septate, hyaline, smooth, 76.5–126 × 3.5–5 µm; stipe extension aseptate, straight, 114.5–144.5 µm long, thick-walled with one basal septum, terminating in thin-walled, fusoid to lanceolate vesicles, 4.5–6 µm wide. Penicillate conidiogenous apparatus with primary branches aseptate, 16.5–24 × 3–4.5 µm, secondary branches aseptate, 10.5–15 × 2–3.5 µm, each terminal branch producing 2–4 phialides; phialides cymbiform to cylindrical, hyaline, aseptate, 9–15.5 × 2–3.5 µm, apex with minute periclinal thickening and collarette. Subverticillate conidiophores abundant, comprising of a septate stipe and primary branches terminating in 2–4 phialides; primary branches straight, hyaline, 0–1-septate, 13.5–35 × 2.5–4 µm; phialides cymbiform to cylindrical, hyaline, aseptate, 14.5–27 × 2–3.5 µm, apex with minute periclinal thickening and collarette. Conidia cylindrical, rounded at both ends, straight, 1-septate, (10–)11–13(–13.5) × (1.5–)2–2.5 µm (av. = 12 × 2 µm), frequently slightly flattened at the base, held in asymmetrical clusters by colourless slime.
Colonies buff to hazel on the surface and dark brick to brown vinaceous in reverse on MEA after 7 d; smooth to undulate margins; moderate aerial mycelium; chlamydospores moderate, arranged in chains. Optimal growth temperature at 25 °C, no growth at 5 °C and 35 °C; after 7 d, colonies at 10 °C, 15 °C, 20 °C, 25 °C and 30 °C reached 3.8 mm, 24.3 mm, 45.2 mm, 74.4 mm and 48.8 mm, respectively.
Sabah, Malaysia
MALAYSIA. Sabah state: Tawau, Brumas, from soil in Acacia mangium plantation, Mar. 2013, M.J. Wingfield, PREM 62162, culture CMW 48276 = CBS 143549; ibid., PREM 62163, culture CMW 48277 = CBS 143550.
Cylindrocladiella malesiana is phylogenetically closely related to Cy. microcylindrica, Cy. natalensis and Cy. solicola. Conidia of Cy. malesiana are shorter than those of Cy. microcylindrica, Cy. natalensis and Cy. solicola (Table
Name refers to the obpyriform terminating vesicles in this species.
VIETNAM. Tuyen Quang Province, from soil in Acacia hybrid plantation, Nov. 2013, N.Q. Pham & T.Q. Pham, herbarium specimen of dried culture, PREM 62165 (holotype), CMW 47194 = CBS 143552 (ex-type culture).
Sexual morph not observed. Conidiophores dimorphic, penicillate and subverticillate, mononematous and hyaline. Penicillate conidiophores comprising a stipe, a penicillate arrangement of fertile branches, a stipe extension and a terminal vesicle; stipe septate, hyaline, smooth, 58.5–148 × 4–6 µm; stipe extension aseptate, straight, 86.5–150 µm long, thick-walled with one basal septum, terminating in thin-walled, obpyriform vesicles, 4–7 µm wide. Penicillate conidiogenous apparatus with primary branches aseptate, 17.5–31.5 × 3–5 µm, secondary branches aseptate, 10–19 × 2–4 µm, each terminal branch producing 2–4 phialides; phialides cymbiform to cylindrical, hyaline, aseptate, 10.5–18 × 2–3 µm, apex with minute periclinal thickening and collarette. Subverticillate conidiophores abundant, comprising of a septate stipe and primary branches terminating in 2–4 phialides; primary branches straight, hyaline, 0–1-septate, 15–38.5 × 2–4 µm; phialides cymbiform to cylindrical, hyaline, aseptate, 13–30.5 × 2–3 µm, apex with minute periclinal thickening and collarette. Conidia cylindrical, rounded at both ends, straight, 1-septate, (9–)11–13(–15) × 2–3(–3.5) µm (av. = 12 × 2.5 µm), frequently slightly flattened at the base, held in asymmetrical clusters by colourless slime.
Colonies buff to isabelline on the surface and dark brick to sepia in reverse on MEA after 7 d; smooth to undulate margins; extensive aerial mycelium especially in the middle; chlamydospores moderate, arranged in chains. Optimal growth temperature at 25 °C, no growth at 5 °C and 35 °C; after 7 d, colonies at 10 °C, 15 °C, 20 °C, 25 °C and 30 °C reached 5.4 mm, 25.5 mm, 47.2 mm, 74.0 mm and 50.8 mm, respectively.
Tuyen Quang & Vinh Phuc, Vietnam
VIETNAM. Vinh Phuc Province: Tam Dao, from soil in Camellia chrysantha nursery, Sept. 2013, N.Q. Pham, Q.N. Dang & T.Q. Pham, PREM 62166, culture CMW 49940 = CBS 143553.
Cylindrocladiella obpyriformis is phylogenetically closely related to Cy. arbusta, Cy. natalensis and Cy. parvispora. The stipe extensions of Cy. obpyriformis are longer than those of Cy. arbusta, Cy. natalensis and Cy. parvispora (Table
Name refers to the small conidia produced by this species.
VIETNAM. Tuyen Quang Province, from soil in Acacia hybrid plantation, Nov. 2013, N.Q. Pham & T.Q. Pham, herbarium specimen of dried culture, PREM 62167 (holotype), CMW 47197 = CBS 143554 (ex-type culture).
Sexual morph not observed. Conidiophores dimorphic, penicillate and subverticillate, mononematous and hyaline. Penicillate conidiophores comprising a stipe, a penicillate arrangement of fertile branches, a stipe extension and a terminal vesicle; stipe septate, hyaline, smooth, 67–107 × 3–6.5 µm; stipe extension aseptate, straight, 112.5–141 µm long, thick-walled with one basal septum, terminating in thin-walled, fusoid to cylindrical vesicles, 4.5–6.5 µm wide. Penicillate conidiogenous apparatus with primary branches aseptate, 10.5–25 × 2–4 µm, secondary branches aseptate, 7.5–17 × 2–3 µm, each terminal branch producing 2–4 phialides; phialides doliiform to reniform to cymbiform, hyaline, aseptate, 7.5–13 × 2–3 µm, apex with minute periclinal thickening and collarette. Subverticillate conidiophores in moderate numbers, comprising of a septate stipe and primary branches terminating in 2–4 phialides; primary branches straight, hyaline, 0–1-septate, 15.5–27 × 2.5–4 µm; phialides cymbiform to cylindrical, hyaline, aseptate, 13.5–41 × 2.5–6 µm, apex with minute periclinal thickening and collarette. Conidia cylindrical, rounded at both ends, straight, 1-septate, (8–)10– 12(–13) × 2–2.5 µm (av. = 11 × 2 µm), frequently slightly flattened at the base, held in asymmetrical clusters by colourless slime.
Colonies buff to honey to isabelline on the surface and umber to sepia in reverse on MEA after 7 d; smooth to undulate margin; abundant aerial mycelium especially in the middle; chlamydospores moderate, arranged in chains. Optimal growth temperature at 25 °C, no growth at 5 °C and 35 °C; after 7 d, colonies at 10 °C, 15 °C, 20 °C, 25 °C and 30°C reached 5.5 mm, 23.4 mm, 43.8 mm, 63.6 mm and 49.2 mm, respectively.
Tuyen Quang, Vietnam
VIETNAM. Tuyen Quang Province, from soil in Acacia hybrid plantation, Nov. 2013, N.Q. Pham & T.Q. Pham, PREM 62168, culture CMW 47207 = CBS 143555; ibid., PREM 62169, culture CMW 47208 = CBS 143556.
Cylindrocladiella parvispora is phylogenetically closely related to Cy. arbusta, Cy. natalensis and Cy. obpyriformis. Conidia of Cy. parvispora are slightly smaller than those of Cy. arbusta, Cy. natalensis and Cy. obpyriformis (Table
Name refers to soil, the substrate from which this fungus was first isolated.
VIETNAM. Tuyen Quang Province, from soil in Acacia hybrid plantation, Nov. 2013, N.Q. Pham & T.Q. Pham, herbarium specimen of dried culture, PREM 62164 (holotype), CMW 47198 = CBS 143551 (ex-type culture).
Cylindrocladiella solicola (ex-type CMW 47198). A–C Penicillate conidiophores D–F Broadly clavate to lanceolate to fusiform vesicles G–H Penicillate conidiogenous apparatus I–J Subverticillate conidiophores K Conidia. Scale bars: A = 20 µm (apply to B–C); D = 10 µm (apply to E–F); G = 10 µm (apply to H–K).
Sexual morph not observed. Conidiophores dimorphic, penicillate and subverticillate, mononematous and hyaline. Penicillate conidiophores comprising a stipe, a penicillate arrangement of fertile branches, a stipe extension and a terminal vesicle; stipe septate, hyaline, smooth, 58.5–120 × 2.5–5 µm; stipe extension aseptate, straight, 93.5–170 µm long, thick-walled with one basal septum, terminating in thin-walled, broadly clavate to lanceolate to fusiform vesicles, 3.5–6.5 µm wide. Penicillate conidiogenous apparatus with primary branches aseptate, 16–36.5 × 3–4.5 µm, secondary branches aseptate, 10–16 × 2.5–3.5 µm, each terminal branch producing 2–4 phialides; phialides cymbiform to cylindrical, hyaline, aseptate, 9–15.5 × 2–3 µm, apex with minute periclinal thickening and collarette. Subverticillate conidiophores abundant, comprising of a septate stipe and primary branches terminating in 2–4 phialides; primary branches straight, hyaline, 0–1-septate, 16.5–25 × 2.5–5 µm; phialides cymbiform to cylindrical, hyaline, aseptate, 12–28 × 2.5–4 µm, apex with minute periclinal thickening and collarette. Conidia cylindrical, rounded at both ends, straight, 1-septate, (10.5–)12.5–14.5(–15.5) × 2–2.5(–3) µm (av. = 13.5 × 2.5 µm), frequently slightly flattened at the base, held in asymmetrical clusters by colourless slime.
Colonies honey to isabelline on the surface and sepia to brown vinaceous in reverse on MEA after 7 d; undulate margins; extensive aerial mycelium especially in the middle; chlamydospores moderate, arranged in chains. Optimal growth temperature at 25 °C, no growth at 5 °C and 35 °C; after 7 d, colonies at 10 °C, 15 °C, 20 °C, 25 °C and 30 °C reached 5.2 mm, 20.4 mm, 37.8 mm, 61.2 mm and 37.1 mm, respectively.
Tuyen Quang, Vietnam
Cylindrocladiella solicola is phylogenetically closely related to Cy. malesiana, Cy. microcylindrica and Cy. natalensis. The stipe extensions of Cy. solicola are longer than those of Cy. malesiana, Cy. microcylindrica and Cy. natalensis (Table
Application of multigene phylogenetic inference made it possible to identify five novel and two known species of Cylindrocladiella in this study. The seven species found bring the number of Cylindrocladiella known from South-East Asia to 20 (
The his3 gene region provided the best resolution for species delineation amongst the four gene regions applied. This was the only gene region that could distinguish between all five novel species in the study. The ITS could not resolve any single lineage and the tef1 gene region failed to distinguish between Cy. arbusta and Cy. parvispora. The phylogenetic relationship between Cy. arbusta, Cy. malesiana and Cy. obpyriformis could not be resolved using the tub2 gene region (Suppl. materials
Five novel species, described as Cy. arbusta, Cy. malesiana, Cy. obpyriformis, Cy. parvispora and Cy. solicola, were all isolated from soil samples associated with Acacia plantations across Malaysia and Vietnam. In comparison with a previous study on Calonectria spp. from South-East Asia (
This study includes the first report of Cy. lageniformis and Cy. peruviana in Vietnam. These two species have been reported as causal agents of black-foot disease, one of the most economically important fungal disease and a major constraint to wine and grape production (
We acknowledge financial support from the Tree Protection and Cooperation Programme (TPCP) and the DST/NRF Centre of Excellence in Tree Health Biotechnology (CTHB), South Africa. We thank the members of the Forest Protection Research Centre (FPRC), Vietnam, especially Quynh N. Dang for the valuable assistance with the cultures.
Figure S1. Phylogenetic tree based on maximum likelihood (ML) analysis of his3 sequence alignments
Data type: molecular data
Explanation note: Bootstrap value ≥ 60 % for maximum parsimony (MP) and ML analyses are indicated at the nodes. Bootstrap values lower than 60 % are marked with “*” and absent are marked with “–”. Isolates representing ex–type material are marked with “T” and isolates collected in this study are highlighted in bold. Calonectria brachiatica (CMW 25307) and Calonectria pauciramosa (CMW 5683) represent the outgroups.
Figure S2. Phylogenetic tree based on maximum likelihood (ML) analysis of tef1 sequence alignments
Data type: molecular data
Explanation note: Phylogenetic tree based on maximum likelihood (ML) analysis of tef1 sequence alignments. Bootstrap value ≥ 60 % for maximum parsimony (MP) and ML analyses are indicated at the nodes. Bootstrap values lower than 60% are marked with “*” and absent are marked with “–”. Isolates representing ex–type material are marked with “T” and isolates collected in this study are highlighted in bold. Calonectria brachiatica (CMW 25307) and Calonectria pauciramosa (CMW 5683) represent the outgroups.
Figure S3. Phylogenetic tree based on maximum likelihood (ML) analysis of tub2 sequence alignments
Data type: molecular data
Explanation note: Bootstrap value ≥ 60 % for maximum parsimony (MP) and ML analyses are indicated at the nodes. Bootstrap values lower than 60 % are marked with “*” and absent are marked with “–”. Isolates representing ex–type material are marked with “T” and isolates collected in this study are highlighted in bold. Calonectria brachiatica (CMW 25307) and Calonectria pauciramosa (CMW 5683) represent the outgroups.
Figure S4. Phylogenetic tree based on maximum likelihood (ML) analysis of ITS sequence alignments
Data type: molecular data
Explanation note: Bootstrap value ≥ 60 % for maximum parsimony (MP) and ML analyses are indicated at the nodes. Bootstrap values lower than 60 % are marked with “*” and absent are marked with “–”. Isolates representing ex–type material are marked with “T” and isolates collected in this study are highlighted in bold. Calonectria brachiatica (CMW 25307) and Calonectria pauciramosa (CMW 5683) represent the outgroups.