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Phylogenetic Analysis of Tilletia and Allied Genera in Order Tilletiales (Ustilaginomycetes; Exobasidiomycetidae) Based on Large Subunit Nuclear Rdna Sequences

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Phylogenetic Analysis of Tilletia and Allied Genera in Order Tilletiales (Ustilaginomycetes; Exobasidiomycetidae) Based on Large Subunit Nuclear Rdna Sequences Mycologia, 97(4), 2005, pp. 888±900. q 2005 by The Mycological Society of America, Lawrence, KS 66044-8897 Phylogenetic analysis of Tilletia and allied genera in order Tilletiales (Ustilaginomycetes; Exobasidiomycetidae) based on large subunit nuclear rDNA sequences Lisa A. Castlebury1 supported clades corresponding to host subfamily. USDA ARS Systematic Botany and Mycology The results of this work suggest that morphological Laboratory, 10300 Baltimore Avenue, Beltsville, characters used to segregate Neovossia, Conidiosporo- Maryland 20705-2350 myces and Ingoldiomyces from Tilletia are not useful Lori M. Carris generic level characters and that all included species can be accommodated in the genus Tilletia. Department of Plant Pathology, Washington State University, Pullman, Washington 99164±6430 Key words: Conidiosporomyces, Erratomyces, ger- mination, Ingoldiomyces, molecular systematics, Neo- KaÂlmaÂn VaÂnky vossia, smut and bunt fungi Herbarium Ustilaginales VaÂnky, Gabriel-Biel-Str. 5, D- 72076 TuÈbingen, Germany INTRODUCTION Abstract: The order Tilletiales (Ustilaginomycetes, The genus Tilletia Tul. & C. Tul. comprises ca. 140 Basidiomycota) includes six genera (Conidiosporomy- species restricted to hosts in the grass family (Po- ces, Erratomyces, Ingoldiomyces, Neovossia, Oberwinkler- aceae) and is the largest genus in order Tilletiales ia and Tilletia) and approximately 150 species. All (Basidiomycota, Ustilaginomycetes, Exobasidiomyce- members of Tilletiales infect hosts in the grass family tidae) (VaÂnky 2002). Tilletia is characterized by the Poaceae with the exception of Erratomyces spp., formation of pigmented teliospores intermingled which occur on hosts in the Fabaceae. Morphological with hyaline sterile cells, and in most species the te- features including teliospore ornamentation, num- liospores are formed in host ovaries. Teliospore or- ber and nuclear condition of primary basidiospores namentation ranges from reticulate, echinulate, ver- and ability of primary basidiospores to conjugate and rucose, tuberculate to smooth. In many species telio- form an infective dikaryon were studied in conjunc- spore masses have a fetid, herring brine odor due to tion with sequence analysis of the large subunit nu- the production of trimethylamine. Teliospores ger- clear rDNA gene (nLSU). Analysis based on nLSU minate to form an aseptate basidium, frequently with data shows that taxa infecting hosts in the grass sub- multiple retraction septa, and a terminal whorl of ae- family Pooideae form one well supported lineage. rial primary basidiospores (FIG. 1). The type species, This lineage comprises most of the reticulate-spored T. tritici, produces 8±12 ®liform to narrowly falcate species that germinate to form a small number of monokaryotic basidiospores (Goates 1996). Most of rapidly conjugating basidiospores and includes the the basidiospores conjugate while attached to the ba- type species Tilletia tritici. Two tuberculate-spored sidium to form an ``H-body,'' giving rise to dikaryotic species with a large number of nonconjugating basid- mycelium that infects host plants at seedling stage, iospores, T. indica and T. walkeri, and Ingoldiomyces resulting in a systemic infection (VaÂnky 1994). A sec- hyalosporus are also included in this lineage. Most of ond type of germination pattern, consisting of the the species included in the analysis with echinulate, production of large numbers of nonconjugating pri- verrucose or tuberculate teliospores that germinate mary basidiospores, is found in species of Neovossia to form a large number (.30) of nonconjugating KoÈrn., Conidiosporomyces VaÂnky (VaÂnky and Bauer basidiospores infect hosts in the subfamilies Panicoi- 1992) and some species of Tilletia, such as T. indica, deae, Chloridoideae, Arundinoideae and Ehrharto- T. horrida and T. walkeri (Castlebury and Carris 1999, ideae. This group of species is more diverse than the DuraÂn 1987). Oberwinkleria VaÂnky & R. Bauer pro- pooid-infecting taxa and in general do not form well duces nonconjugating primary basidiospores (VaÂnky and Bauer 1995) but their nuclear condition was not Accepted for publication 23 March 2005. reported. Corresponding author. E-mail: [email protected] Five of six genera in Tilletiales, Conidiosporomyces, Mention of trade names or commercial products in this article is Ingoldiomyces VaÂnky, Neovossia, Oberwinkleria and Til- solely for the purpose of providing speci®c information and does not imply recommendation or endorsement by the U.S. Depart- letia, are known to infect only grass hosts. Most spe- ment of Agriculture. cies within these genera produce teliospores in host 888 CASTLEBURY ET AL:PHYLOGENETIC ANALYSIS OF TILLETIALES 889 and Bauer 1997). Conidiosporomyces and Ingoldiomyces are based on Tilletia ayresii and Tilletia hyalospora, respectively. Conidiosporomyces is distinguished from Tilletia by the formation of an apically open, sac-like sorus and presence of Y-shaped conidia (FIG. 2G) in the sorus (VaÂnky and Bauer 1992). Two additional species have been transferred to the Conidiosporomy- ces from Tilletia and Ustilago (Pers.) Roussel (VaÂnky 1993, 2001). The monotypic Ingoldiomyces is distinguished from Tilletia by formation of ballistosporic primary basid- iospores and a unique type of teliospore ornamen- tation (VaÂnky and Bauer 1996). Oberwinkleria, also monotypic, was erected for a new species, O. anulata K.&C.VaÂnky, and is characterized by greatly re- FIG.1. Tilletia tritici germinated teliospore with conju- duced basidia and primary basidiospores produced gating primary basidiospores. Bar 5 20 mm. on pedicels (VaÂnky and Bauer 1995). Neovossia was erected based on Neovossia moliniae (ThuÈm.) KoÈrn., ovaries, with the exception of nine Tilletia species a Tilletia-like species producing teliospores with a hy- that form teliospores in leaves and stems (Zogg aline appendage, local infection, a large number 1972). The sixth genus, Erratomyces M. Piepenbr. & (.40) of nonconjugating primary basidiospores and R. Bauer, comprises ®ve species that produce telio- without sterile cells (VaÂnky 1994). Ten or more spe- spores in leaves of Fabaceae and have a teliospore cies have been placed in Neovossia, but the generic germination pattern similar to Tilletia (Piepenbring boundary between Neovossia and Tilletia is not clear FIG. 2. Spore types from various species in the Tilletiales. A. Blastospores from T. ixophori. B. Denticulate sporogenous cells from T. kimberleyensis. C. Formation of ballistospores and proliferation of ballistospore. D. Formation of blastospores. E. Proliferating blastospores. F. Uninucleate and multinucleate primary basidiospores. G. Y-shaped conidia formed in culture of C. verruculosus. 890 MYCOLOGIA and VaÂnky (2002) now considers Neovossia a mono- terminator kit (Applied Biosystems, Foster City, California) typic genus. on an automated DNA sequencer with these primers: LR0R, Members of Tilletiales have been poorly repre- LR3R, LR5R, LR7, LR5, LR3 (Vilgalys and Hester 1990, sented in previous phylogenetic analyses of the smut Rehner and Samuels 1994, 1995). fungi (Begerow et al 1997, Begerow et al 2000). The Sequence analysis.ÐRaw sequences were edited with Se- analysis of Begerow et al (1997) included only four quencher version 4.1.4 for Windows (Gene Codes Corp., type species, Ingoldiomyces hyalosporus, Conidiosporo- Ann Arbor, Michigan). Alignments were adjusted manually myces ayresii, Tilletia tritici and Erratomyces patelii. In with GeneDoc 2.6.001 (http://www.psc.edu/biomed/gene- that analysis T. tritici and I. hyalosporus were related doc/). The alignment included sequences from 57 isolates, most closely and formed a sister group of C. ayresii, with three species of Entyloma de Bary and one species of with E. patelii basal to these species. The present Graphiola Poit. (WSP 71169) as outgroup taxa and consisted study, using nLSU sequence data, was initiated to de- of 1345 positions. Entyloma and Graphiola also are con- termine phylogenetic relationships among species of tained within the Exobasidiomycetidae in different orders and have been placed close to the Tilletiales in previous Tilletia and segregate genera. Data on teliospore analyses (Begerow et al 1997). The sequence alignment was morphology, teliospore germination, primary and deposited in TreeBase. secondary basidiospore morphology, and nuclear Trees were inferred by the neighbor joining (NJ) method condition, when available, are presented. (Kimura 2-parameter distance calculation) and by maxi- mum parsimony (MP) using the heuristic search option with the random addition sequence (1000 replications, MATERIALS AND METHODS maximum of 100 trees saved per replicate) and the branch swapping (tree bisection-reconnection) option of PAUP* Isolation, maintenance and deposition of cultures and voucher 4.0b10 (Swofford 2002). All aligned positions were included specimens.ÐSpecies used in this study are listed (TABLE I). in the analyses. All characters were unordered and given All available taxa for which teliospores could be germinated equal weight. Gaps were treated as missing data in the par- were included. Teliospores were germinated after soaking simony analysis and the neighbor joining analysis; missing in water for 2 d and surface sterilization in 0.26% NaClO or ambiguous sites were ignored for affected pairwise com- (5% v/v commercial bleach) on 2% water agar at room parisons. Relative support for branches was estimated with temperature (20±25 C), 15 C or 5 C depending on the 1000 bootstrap replications
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