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Evolutionary Implications of a Rrna-Based Phylogeny of Harpellalesy

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Evolutionary Implications of a Rrna-Based Phylogeny of Harpellalesy mycological research 110 (2006) 1011–1024 available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/mycres Evolutionary implications of a rRNA-based phylogeny of Harpellalesy Merlin M. WHITE Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas 66045-7534, USA article info abstract Article history: The Harpellales (Trichomycetes) are endosymbiotic microfungi, mostly unculturable and pre- Received 23 January 2006 dominantly associated with larval aquatic insects worldwide. Molecular phylogenies in- Received in revised form cluding ‘gut fungi’ have included at most only four axenic isolates of the 38 genera of 13 May 2006 Harpellales. Cladistic analyses were used to infer the phylogeny of the Harpellales using par- Accepted 1 June 2006 tial 18S or 28S nu-rRNA sequences generated for 16 genera of Harpellales, with 64 of 72 se- Published online 22 August 2006 quences generated from unculturable samples. Both analyses placed Orphella outside an Corresponding Editor: otherwise monophyletic group of Harpellales, more closely allied to the Kickxellales. The cur- Richard A. Humber rent classification recognizing two families is not corroborated and continued use of the family Legeriomycetaceae may not be supportable. The largest genera of Harpellales, Smittium Keywords: and Stachylina, were polyphyletic and the 28S rRNA sequences separate Smittium culisetae Commensalism from the remainder of its genus. The cladograms did not support the consistent mapping Insecta of important morphological taxonomic characters, including trichospore shape and zygo- Symbiosis spore type or appendage numbers for both. This study demonstrates the use of microscopic Systematics thalli from host guts for molecular phylogenies and suggests the need for more data from Zygomycota the remaining Harpellales, especially with the future inclusion of protein-coding genes. ª 2006 Published by Elsevier Ltd on behalf of The British Mycological Society. Introduction data have revealed Eccrinales are also protists (Cafaro 2003, 2005),andtheclassification oftheTrichomycetes,asotherZygomy- Just two decades ago the class Trichomycetes (Zygomycota)was cota,isinastateofflux(Whiteet al. unpubl.). thought to include three true fungal orders, all obligate endo- The Harpellales (herein gut fungi) includes two families: the symbionts of various Arthropoda (Lichtwardt 1986). The gut fungi Harpellaceae (Le´ger & Duboscq 1929) for all unbranched species occur worldwide in all habitats where appropriate hosts have attached to midgut linings of lower dipteran (Nematocera) been sought (Misra 1998; White et al. 2000, 2001). The Harpellales hosts, and the Legeriomycetaceae (Pouzar 1972) for all branched attach to the midgut or hindgut linings of larval aquatic insects species commonly associated with lower Diptera, mayflies or, exceptionally, in freshwater isopods (White 1999). The Asellar- (Ephemeroptera), stoneflies (Plecoptera), beetles (Coleoptera) and iales includes species that inhabit terrestrial, freshwater and ma- caddisflies (Trichoptera)(Lichtwardt 1986; Lichtwardt et al. rine Isopoda or Collembola (springtails). The Eccrinales occur in the 1999, 2001a; White 1999). Harpellales have unique asexual tri- foregut or hindgut of Diplopoda, Crustacea or Insecta. A fourth or- chospores and four kinds of sexual biconical zygospores der, the Amoebidiales, long regarded as an unnatural member of (Lichtwardt 1986; Moss et al. 1975) [but see Discussion on sex- the Trichomycetes,wasthefirsttoberecognizedasprotistan ual spores of Orphella]. Zygospores are designated according to based on molecular data (Benny & O’Donnell 2000; Ustinova their arrangement on the zygosporophore: (1) perpendicular et al. 2000). Recently, phyogenetic studies using rRNA sequence and medially attached to the zygosporophore (type I); (2) y This paper is dedicated to the memory of Stephen T. Moss for his significant contributions to our understanding of the gut fungi. E-mail address: [email protected] 0953-7562/$ – see front matter ª 2006 Published by Elsevier Ltd on behalf of The British Mycological Society. doi:10.1016/j.mycres.2006.06.006 1012 M. M. White oblique and submedial (type II); (3) parallel and medial (type thalli placed in 500 mlof2Â Hexadecyltrimethylammonium III); (4) coaxial and polar (type IV) (Lichtwardt 1986 and see cur- bromide (CTAB) buffer (2% CTAB, 1.4 M Tris–HCl pH 8.0, rent monograph by Lichtwardt et al. 2001a; Moss et al. 1975). 0.25 m M EDTA) (Gottlieb & Lichtwardt 2001) immediately after Other morphological taxonomic characters include the size dissection and identification. Invariably, vouchers of gut fungi and shape of the spores, number of appendages, spore num- included host tissue or other microscopic organisms associ- ber per thallus branch, shape of the holdfast, nature of the ated with or passing through the host gut. The digestive tract, attachment (e.g., presence of adhesive exudate or mucilage, once removed from the host, was dissected with fine needles etc.), and kind of host. or forceps, and gut fungi were identified in wet mounts. Thalli Several morphologically based hypotheses have been pro- of a separated fungal species (multiple taxa of gut fungi can be posed regarding the natural affinities of the orders of Tricho- found in a single gut) were kept in CTAB buffer at À20 C (up to mycetes (Cavalier-Smith 1998; Lichtwardt 1986; Moss 1979; 4 y) before DNA extraction. Exemplars were selected to maxi- Moss & Young 1978). Studies have shown that the Harpellales mize the number of genera of Harpellales for phylogenetic anal- may be closely related to the Kickxellales (class Zygomycetes) ysis. Other samples were colonies of axenic cultures similarly (Benjamin 1979) based on serological affinities and even at placed in CTAB buffer. A few dilutions of genomic DNA were the gross morphological or ultrastructural level (Benny & donations from the earlier study of Gottlieb & Lichtwardt (2001). White 2001; Moss 1979, 1998; Moss & Young 1978; Sangar et al. 1972). The lack of a clear consensus on the ordinal rela- DNA extraction tionships is in part due to the paucity of taxonomic characters and the unculturability of many of these fungi. Standard procedures for CTAB extraction were followed (Got- Molecular systematic approaches have led to the reconsid- tlieb & Lichtwardt 2001; O’Donnell et al. 1997). In some cases, eration of evolutionary histories among many organisms specimens were repeatedly frozen, by submerging in liquid ni- across many fields, and mycology is no exception. Cladistic trogen and thawing at 65 C in a heat block (but no attempt analyses of sequence data helped establish the Glomeromycota was made to crush the microscopic amounts of thalli). After (Schuessler et al. 2001) and changed our understanding of two chloroform extractions, DNA was precipitated, eluted in major evolutionary lineages across fungal phyla. Compara- TE buffer (10 mM Tris–HCl pH 8.0, 1 m M EDTA pH 8.0) and ei- tively slower progress has been made with the Chytridiomycota ther used directly or after dilution in sterile double distilled and Zygomycota with phylogenetic analyses highlighting the water (ddH2O) for PCR amplification. Some genomic DNA ex- polyphyletic or paraphyletic nature of these basal fungi, and tracts were cleaned using glassmilk or glass bead columns fol- with a recognized need for further contributions to various lowing the protocols of the GENECLEAN II Kit (Bio 101, Vista, understudied taxa (see reviews pending by James et al. unpubl. CA) or the GENECLEAN Turbo Kit (Quantum Biotechnologies, and White et al. unpubl.). Carlsbad, CA), respectively. To date, nu-rRNA phylogenies including gut fungi have only considered culturable representatives. Walker (1984) in- PCR amplification of rRNA cluded Harpellales and Kickxellales, but the 5S rRNA sequences lacked resolving power to determine the sister group relation- Several modifications of published protocols were introduced ships that O’Donnell et al. (1998) demonstrated using 18S rRNA to amplify the regions between the 50 end of the 18S and 30 end sequences (and morphological characters) for four genera of (near the second domain) of the 28S nuclear rRNA gene. Initial Harpellales. Gottlieb & Lichtwardt (2001) illustrated a similar attempts followed the protocol and cycling conditions of pattern using more taxa of culturable Harpellales, but also O’Donnell et al. (1997) and Gottlieb & Lichtwardt (2001). Occa- demonstrated that Smittium was polyphyletic, with at least sionally, buffer conditions were altered or PCR products were five lineages. reamplied to generate sufficient product for sequencing reac- The Harpellales is the only culturable fungal order of Tricho- tions. Various primer combinations were tested using the mycetes, but only eight of the 38 genera have been isolated axe- universal primers of White et al. (1990) or modifications of nically, and about 80% of those (in The University of Kansas them (Gottlieb & Lichtwardt 2001; O’Donnell et al. 1998)in Mycology Culture Collection) are Smittium species. Despite combinations that spanned various regions of the rRNA the successful isolation of nearly half of all known species of operon. Owing to mixed genomic DNA templates typically Smittium, the inability to culture the majority of gut fungi obtained from the unculturable specimens taken directly has hindered phylogenetic studies due to the omission of from guts, often multiple (sized) PCR products were recovered. unculturable taxa (most Harpellales and all Asellariales). The Therefore,
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