Research Article |
Corresponding author: Yan-Lu Chen ( 99461980@qq.com ) Academic editor: Cecile Gueidan
© 2019 Ling Xie, Yan-Lu Chen, Yan-Yan Long, Yan Zhang, Shi-Tong Liao, Bin Liu, Li-Ping Qin, Qian Nong, Wen-Long Zhang.
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:
Xie L, Chen Y-L, Long Y-Y, Zhang Y, Liao S-T, Liu B, Qin L-P, Nong Q, Zhang W-L (2019) Three new species of Conlarium from sugarcane rhizosphere in southern China. MycoKeys 56: 1-11. https://doi.org/10.3897/mycokeys.56.35857
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Three new species isolated from sugarcane rhizosphere in China, namely Conlarium baiseense sp. nov., C. nanningense sp. nov., and C. sacchari sp. nov., are described and illustrated. Molecular evidence (phylogenetic analysis of combined LSU, SSU, ITS and RPB2 sequence data) and phenotypical characters support their independent status from related and similar species. The new species, as dark spetate endophytes, inhabit sugarcane rhizosphere and can form a symbiosis with sugarcane.
Conlariaceae, conidial fungi, phylogeny, Rhizosphere, taxonomy
The genus Conlarium, described by
All soil samples were collected from the 5–15 cm deep sugarcane rhizosphere by five sampling methods in Guangxi province, China. Fungal isolations were obtained by using Chinese cabbage as a baiting plant, as described by
The genomic DNA was extracted from mycelium grown on PDB (potato dextrose broth) at 28 °C for 10 d using the Prepman Ultra Sample Preparation Reagent Protocol (Applied Biosystems, California, USA). The large subunit ribosomal RNA gene (LSU), the small subunit ribosomal RNA gene (SSU), the internal transcribed spacer (ITS) rDNA, and the RNA polymerase II subunit 2 (RPB2) were amplified with fungal specific primers LROR/LR5, NS1/NS4, ITS1/ITS4, and fRPB2-5f/fRPB2-7cR (
Taxa | Voucher | GenBank no. | |||
SSU | ITS | LSU | RPB2 | ||
Conlarium nanningense | M1 | KX886203 | KX886204 | KX886202 | MK224589 |
Conlarium baiseense | TD2 | MF083159 | MF083157 | MF083158 | MK573000 |
Conlarium sacchari | NN1 | MF083162 | MF083160 | MF083161 | MK224588 |
Conlarium sacchari | LA3 | MF083165 | MF083163 | MF083164 | MK573001 |
Conlarium sacchari | DX4 | MF083168 | MF083166 | MF083167 | MK224587 |
Conlarium baiseense | TD17 | MK164657 | MK164653 | MK164655 | MK572999 |
Conlarium nanningense | M8 | MK164658 | MK164654 | MK164656 | MK572998 |
Conlarium duplumascospora | CGMCC 14938 | JN936987 | JN936995 | JN936991 | NS |
Conlarium duplumascospora | CGMCC 14939 | JN936988 | JN936996 | JN936992 | NS |
Conlarium duplumascospora | CGMCC 14940 | JN936989 | JN936997 | JN936993 | NS |
Conlarium aquaticum | MFLUCC 15-0992 | MF374372 | MF374354 | MF374363 | NS |
Conlarium thailandense | MFLUCC 17-2349 | MH624128 | MH624129 | MH624127 | NS |
Atractospora thailandensis | KUMCC 16-0067 | MF374371 | MF374353 | MF374362 | MF370951 |
Atractospora reticulata | CBS 127884 | NS | KT991669 | KT991660 | KT991649 |
Atractospora reticulata | CBS 138740 | NS | KT991670 | KT991661 | KT991650 |
Atractospora decumbens | CBS 139032 | KT991640 | KT991667 | KT991658 | KT991647 |
Atractospora verruculosa | CBS 132040 | KT991641 | KT991668 | KT991659 | KT991648 |
Pseudoproboscispora thailandensis | MFLUCC 15-0989 | MF374377 | MF374360 | MF374369 | NS |
Rubellisphaeria abscondita | CBS 132078 | KT991646 | KT991678 | KT991666 | KT991657 |
Lentomitella cirrhosa | ICMP 15131 | AY761089 | KY931780 | AY761085 | KM492911 |
Torrentispora biatriispora | A 464-3 | NS | KY931803 | AY316352 | KY931858 |
Bayesian analyses of the same aligned four kinds of rDNA sequences dataset were conducted with MrBayes v. 3.1.2 (
The species is named for Nanning City, the type locality.
CHINA. Guangxi: Nanning City, Datang Town. 22°23'25"N, 108°23'12"E, 144 m alt., in sugarcane rhizosphere, 11 Feb. 2011, L. Xie, M1 (HMAS 247075 holotype) deposited in Microbiology Research Institute, Guangxi Academy of Agricultural Science.
Colony reached 22 mm diameter on PDA medium after 2 weeks, grey-white to grey-brown, nearly circular, flat growth, less aerial hyphae. Hyphae grey-brown, verruculose, septate. Conidiophores 1–15 × 1–5 μm (6 ± 3 × 4 ± 1 µm, n = 54), stubby, unbranched, septate or aseptate, straight or flexuous, hyaline, becoming brown with age. Conidiogenous cells determinate, doliiform, cylindrical, 4–13 × 5–10 µm (6 ± 2 × 7 ± 2 µm, n = 22). Conidia brown, muriform, irregularly globose or subglobose, smooth, constricted at the septa, 0–1 transversely septa, 0–4 longitudinal septa, 11–21 × 9–21 µm (15 ± 3 × 13 ± 3 µm, n = 50). Chlamydospores subglobose or irregular, 4–12 µm (7±2 µm, n = 67). Sexual morph: undetermined.
In sugarcane rhizosphere soil of southern China.
CHINA. Guangxi: Nanning City, Datang Town. 22°29'54.51"N, 108°24'3.06"E, 102 m alt., in sugarcane rhizosphere, 11 Feb. 2011, L. Xie, M8 (HMAS 247985).
Conlarium nanningense is similar to the asexual morph of C. aquaticum, C. duplumascospora, and C. thailandense. They all have monoblastic, holoblastic conidiogenous cells and mostly irregular, brown, clathrate, muriform conidia (
The species is named for Baise City, the type locality.
CHINA. Guangxi: Baise City, Tiandong County, Silin Town. 23°30'38"N, 107°20'1"E, 109 m alt., in sugarcane rhizosphere, 11 Sep 2015, Y.L. Chen and L.P. Qin, TD2 (HMAS 247298, holotype) deposited in Microbiology Research Institute, Guangxi Academy of Agricultural Science.
Colony reached 14 mm diameter on medium after 2 weeks at 28 °C, grey-white to grey, circular, flat growth, less aerial hyphae, regular edge of colony. Hyphae light yellow-green to light yellow-brown, septate. Conidiophores yellow-brown, mostly stubby, 0–2-branched, 0–8-septate, straight or flexuous, 3–12 × 2–6 μm (7 ± 2 × 4 ± 1 μm, n = 51). Conidiogenous cells determinate, doliiform, yellowbrown to brown, 3–8 × 5–12 μm (6 ± 1 × 7 ± 2 μm, n = 51). Muriform conidia yellow-brown to brown, irregularly globose or subglobose, smooth, constricted at the separation, 0–1 transversely septa, 0–4 longitudinal septa, 15–25 × 12–19 μm (18 ± 2 × 15 ± 2 μm, n = 26). Columnar conidia, yellow-brown to brown, 2–5 transversely septa, no longitudinal septa, 21–35 × 7–12 μm (28 ± 5 × 10 ± 1 μm, n = 23). Sexual morph: undetermined.
In sugarcane rhizosphere soil of southern China.
CHINA. Guangxi: Baise City, Tiandong County, Silin Town. 23°30'3.68"N, 107°20'1"E, 112.5 m alt., in sugarcane rhizosphere, 11 Sep. 2015, Y.L. Chen and L.P. Qin, TD17 (HMAS 247986).
Conlarium baiseense is similar to the asexual morph of C. aquaticum, C. duplumascospora, C. nanningense, and C. thailandense. They all have monoblastic, holoblastic, conidiogenous cells and mostly irregular, brown, clathrate, muriform conidia (
The epithet “sacchari” refers to the habitat where first collected.
CHINA. Guangxi: Chongzuo City, Daxin County, Lanxu Village. 22°44'46"N, 107°15'15"E, 241 m alt., in sugarcane rhizosphere, 8 July 2015, Y.L. Chen and L.P. Qin, DX4 (HMAS 247299, holotype) deposited in Microbiology Research Institute, Guangxi Academy of Agricultural Science.
Colony reached 15 mm diameter on medium after 2 weeks at 28 °C, greywhite to grey, circular, flat growth, less aerial hyphae, regular edge of colony. Hyphae light yellow to yellow-brown, septate. Conidiophores yellow-brown, mostly stubby, 0–2-branched, 0–6-septate, straight or flexuous, 3–30×2–4 μm (10 ± 7 × 3 ± 1 μm, n = 43). Conidiogenous cells determinate, doliiform, yellow-brown to brown, 4–12 × 2–7 μm (7 ± 2 × 5 ± 1 μm, n = 52). Conidia yellow-brown to brown, muriform, irregularly globose or subglobose, smooth, constricted at the separation, 0–1 transversely septa, 0–4 longitudinal septa, 14–19×13–22 μm (17 ± 3 × 16 ± 2 μm, n = 20). Sexual morph: undetermined.
In sugarcane rhizosphere soil of southern China.
CHINA. Guangxi: Nanning City, Long’an County, Natong Town. 23°4'48"N, 107°47'31"E, 128 m alt., in sugarcane rhizosphere, 11 Sep. 2015, Y.L. Chen and L.P. Qin, LA3 (HMAS 247300). Nanning City, Suxu town. 23°34'42"N, 108°8'30"E, 325 m alt., in sugarcane rhizosphere, 11 Feb. 2011, L. Xie, NN1 (HMAS 247301).
Conlarium sacchari is similar to the asexual morph of C. aquaticum, C. baiseense, C. duplumascospora, C. nanningense, and C. thailandense. They all have monoblastic, holoblastic, conidiogenous cells and mostly irregular, brown, clathrate, muriform conidia (
To determine the phylogenetic positions of the three new species, C. baiseense, C. nanningense and C. sacchari, all available SSU, ITS, LSU, and RBP2 sequences of Conlarium species and related genera in GenBank were downloaded (Table
Bayesian tree based on the combined SSU+ITS+LSU+RBP2 sequences of Conlarium species and related families. Lentomitella cirrhosa was designated as outgroups. The numbers at each branch point represented Bayesian posterior probabilities (left) and percentage bootstrap support calculated from 1,000 replicates (right). *indicates lack of support or support less than 50 % for a particular clade. New species proposed are in bold. Bar 0.1 expected changes per site.
The genus Conlarium comprises three species, C. duplumascosporum, C. thailandense, and a hyphomycetous asexualmorph taxon, C. aquaticum. They have subglobose or irregular, brown, clathrate, muriform conidia (
This work was supported by China National Natural Science Foundation (No. 31460016), Guangxi Natural Science Foundation (No. 2015GXNSFBA139083), and Basic Scientific Research Special Project of Guangxi Academy of Agricultural Sciences (No. 2015YT80).