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The Agaricoid Genus Kinia Is a New Member of the Pluteoid Clade Subordinate to Melanoleuca

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The Agaricoid Genus Kinia Is a New Member of the Pluteoid Clade Subordinate to Melanoleuca Mycosphere The agaricoid genus Kinia is a new member of the Pluteoid clade subordinate to Melanoleuca Vizzini A1*, Consiglio G2, Setti L3 and Murat C4 1Dipartimento di Biologia Vegetale - Università degli Studi di Torino, Viale Mattioli, 25 - 10125 Torino, Italy 2Via Ronzani, 61 - 40033 Casalecchio di Reno (Bologna), Italy 3Via C. Pavese, 1 - 46029 Suzzara (Mantova), Italy 4UMR INRA-UHP "Interactions Arbres/Microorganismes" IFR 110 Genomique, Ecophysiologie et Ecologie Fonctionnelles, 54280 Champenoux, France Vizzini A, Consiglio G, Setti L, Murat C. 2010 – The agaricoid genus Kinia is a new member of the Pluteoid clade subordinate to Melanoleuca. Mycosphere 1(2), 141–145. Based on maximum likelihood and Bayesian LSU rDNA analyses, the recently described monospecific genus Kinia is reduced to a subgenus of the genus Melanoleuca, a genus exhibiting phylogenetic affinities with members of the Pluteaceae within the Pluteoid clade. The new combination Melanoleuca privernensis and the new subgenus Kinia, are introduced. Key words – Agaricomycetes – Amanitaceae – Pluteaceae – bilateral gill trama – taxonomy Article Information Received 14 April 2010 Accepted 26 April 2010 Published online 19 July 2010 *Corresponding author: Alfredo Vizzini – e-mail – [email protected] Introduction in Kinia privernensis are features shared with Kinia Consiglio, Contu, Setti & Vizzini the genus Gerhardtia Bon (Bon 1994, 1999; (Consiglio et al. 2008) is a recently described Contu & Consiglio 2004), a member of the monospecific genus typified by Kinia priver- Lyophyllaceae (Kühner) Jülich (Frøslev et al. nensis. It is characterized by a unique and 2003, Saar et al. 2009) which, however, is rather peculiar suite of characters such as a distinguished by having shorter collybioid tricholomatoid habit, non-amyloid, ornamented basidia and a non-divergent gill trama. Other spores, long hygrophoroid and siderophilous genera with slightly siderophilous basidia and basidia with granulations of the micro-type ornamented basidiospores lacking clamps, such (sensu Clémençon 1978, 2004), bilateral gill as Melanoleuca Pat. and Lyophyllopsis Sathe & trama, and a lack of both clamp-connections in Daniel (Singer 1986), have clearly amyloid the hyphae of the whole basidioma and well- spore warts. Genera with a divergent hyme- differentiated cystidia. nophoral trama are well characterized and The taxon is clearly a member of the different from Kinia, namely Amanitaceae R. former Tricholomataceae sensu R. Heim ex Heim ex Pouzar, Pluteaceae Kotl. & Pouzar, Pouzar, but it does not fit the description of any and Hygrophorus Fr. in the Hygrophoraceae of the currently described genera in the Lotsy (Singer 1986, Reijnders & Stalpers Agaricales and, based on micromorphological 1992). data only, its familial affiliations remain rather The aim of the present paper was to cryptic. investigate the phylogenetic relationships of The angular-verrucose spores, siderophi- Kinia within the Agaricales by the application lous basidia and the lack of clamp connections of molecular techniques. 141 Methods 1999). Using RAxML (Stamatakis et al. 2005), Electronic micrography was made under a maximum-likelihood cladogram with 1,000 a Zeiss DSM 950 SEM following Moreno et al. fast bootstraps was constructed following the (1995). GTR+G base substitution model using The new subgenus and the new combina- Lyophyllum decastes as outgroup. Bayesian tion are deposited in MycoBank (http://www. inference (BI) based upon the posterior mycobank.org/). probability distribution of trees was performed with MrBayes (Ronquist & Huelsenbeck 2003) DNA extraction, PCR amplification, and with the following settings: outgroup Lyophyl- DNA sequencing lum decastes; Lset nst = 6 rates = gamma; Genomic DNA was isolated from 1 mg mcmcp ngen = 1,000,000 samplefreq = 1,000; of a dried herbarium specimen from the Kinia other settings = default. The sump burnin = 250 privernensis type collection by using the was used to verify the stationarity of the DNeasy Plant Mini Kit (Qiagen, Milan, Italy) analysis. The sumt command with respective according to the manufacturer’s instructions. burnin values was used to produce summary Universal primers LR0R/LR6 (Vilgalys & statistics for trees sampled during the Bayesian Hester 1990; Vilgalys lab, unpublished, http: analysis. The consensus tree was visualized //www.botany.duke.edu/fungi/mycolab) were and edited with FigTree v1.1.2 (Rambaut 2010). used for the LSU rDNA amplification. Amplification reactions were performed Results and discussion in PE9700 thermal cycler (Perkin-Elmer, The LSU rDNA K. privernensis sequence Applied Biosystems) in a 25 μl reaction was submitted to GenBank as accession mixture using the following final concen- number FN825672, and the alignments and trations or total amounts: 5 ng DNA, 1× PCR phylogenetic tree were deposited in TreeBASE buffer (20 mM Tris/HCl pH 8.4, 50 mM KCl), (www.treebase.org) under accession number 1 μM of each primer, 2.5 mM MgCl2, 0.25 mM 10613. of each dNTP, 0.5 unit of Taq polymerase Both maximum likelihood and Bayesian (Promega). The PCR program was as follows: analyses resulted in the same topology (Fig. 1), 3 min at 95 °C for 1 cycle; 30 s at 94 °C, 45 s with Kinia clearly clustering within Melano- at 50 °C for both ITS and LSU primers, 2 min leuca species of the Pluteoid clade as delimited at 72 °C for 35 cycles, 10 min at 72 °C for 1 by Matheny et al. (2006). This result is also cycle. PCR products were resolved on a 1.0% confirmed by a preliminary analysis of ITS agarose gel and visualized by staining with sequences (data not shown). ethidium bromide. The PCR products were The Pluteoid clade includes four families purified and sequenced by DiNAMYCODE srl of agaricoid and gasteroid fungi: the Pluteaceae, (Turin, Italy). Amanitaceae, Pleurotaceae Kühner and Limno- perdonaceae G.A. Escobar, plus some single Sequence alignment and phylogenetic and isolated genera as Tricholomopsis Singer analysis and Cantharocybe H.E. Bigelow & A.H. Sm. The sequence obtained in this study was Many taxa of the Pluteoid clade develop compared to the GenBank sequence database evident cystidia (e.g. Pluteus Fr., Volvariella (http://www.ncbi.nlm.nih.gov/Genbank/) using Speg., Hohenbuehelia Schulzer, Tricholo- the blastn algorithm. Sequences included in the mopsis and Melanoleuca) and most taxa are phylogenetic analyses were either generated by saprobic, with the exception of many ectomy- us or obtained from GenBank. Based on the corrhizal Amanita Pers. species and their blastn results, sequences were selected ac- sequestrate allies (Torrendia Bres. and cording to the outcomes of other phylogenetic Amarrendia Bougher & T. Lebel). Pleurotus studies of Agaricales (Moncalvo et al. 2002, (Fr.) P. Kumm. and Hohenbuehelia, in the Matheny et al. 2006). Multiple alignments were Pleurotaceae, are able to prey upon nematodes performed with CLUSTAL W (Thompson et al. (Thorn et al. 2000). 1994) using default settings and manually The placement of Kinia within Melano- optimized with BioEdit version 5.0.9 (Hall leuca is not completely surprising since their 142 Mycosphere 69 71 99 76 83 100 52 71 86 100 98 100 93 100 100 98 100 85 100 99 64 60 61 72 68 88 66 99 95 55 84 Kinia privernensis 100 100 100 100 52 100 100 51 67 98 100 60 82 98 80 93 87 68 100 77 57 100 91 100 Fig 1. – The Pluteoid clade. Maximum-likelihood cladogram inferred from 940 bp LSU rDNA region alignment. Bootstrap values superior to 50 are shown above branches. Posterior probability values coming from the Bayesian inference over 50 are shown below branches. Lyophyllum decastes was used as outgroup. basidiomata share a similar habit, have clamps, MycoBank 518313 siderophilous granulation of the micro-type in Basionym: Kinia privernensis Consiglio, the basidia, and ornamented basidiospores. As Contu, Setti & Vizzini, Rivista di Micologia a consequence, we propose the new combina- 51(4): 293 (2008). tion: The presence of ornamented spores (Fig. 2) with inamyloid warts, long basidia and Melanoleuca privernensis (Consiglio, Contu, bilateral hymenophoral trama (Fig. 3), however, Setti & Vizzini) Consiglio, Setti & Vizzini, are characters so aberrant in Melanoleuca comb. nov. 143 Figs 2–3 – Melanoleuca privernensis. 2 Spores. 3 Gill trama (bar = 20 µm). as to warrant the establishment of a new References subgenus: Bon M. 1994 – Deux Lyophylloideae Melanoleuca subgenus Kinia (Consiglio, intéressantes et le genre Gerhardtia st. et Contu, Setti & Vizzini) Consiglio, Setti & nom. nov. Documents Mycologiques 24, Vizzini, stat. nov. 65–68. MycoBank 518312 Bon M. 1999 – Les Collybio-marasmioïdes et ressemblants. Documents Mycologiques, Basionym: Genus Kinia Consiglio, Contu, Mém. Hors Sér. n 5. Amiens. Setti & Vizzini, Rivista di Micologia 51(4): Clémençon H. 1978 – Siderophilous granules 292 (2008). in the basidia of Hymenomycetes. Typus: Kinia privernensis Consiglio, Persoonia 10, 83–96. Contu, Setti & Vizzini. Clémençon H. 2004 – Cytology and plectology of the Hymenomycetes. Bibliotheca My- With the inclusion of Kinia, Melanoleuca cologica 199, 1–488. encompasses taxa with amyloid and non- Consiglio G, Contu M, Setti L, Vizzini A. 2008 amyloid spores. However, such a situation is – Kinia, a systematically-cryptic new also present, and has been long accepted in genus of Agaricomycetes (Basidiomy- Amanita, another monophyletic genus of the cota). Rivista di Micologia 51, 291–299. Pluteoid clade. Contu M, Consiglio G. 2004 – Il genere The presence of a bilateral gill trama in Gerhardtia (Lyophyllaceae)
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