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Phaeophyceae) Inferred from a Psbc and Rbcl Based Phylogeny

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Phaeophyceae) Inferred from a Psbc and Rbcl Based Phylogeny European Journal of Phycology ISSN: 0967-0262 (Print) 1469-4433 (Online) Journal homepage: https://www.tandfonline.com/loi/tejp20 A revised classification of the Sphacelariales (Phaeophyceae) inferred from a psbC and rbcL based phylogeny Stefano G. A. Draisma , Willem F. Prud’homme Van Reine & Hiroshi Kawai To cite this article: Stefano G. A. Draisma , Willem F. Prud’homme Van Reine & Hiroshi Kawai (2010) A revised classification of the Sphacelariales (Phaeophyceae) inferred from a psbC and rbcL based phylogeny, European Journal of Phycology, 45:3, 308-326, DOI: 10.1080/09670262.2010.490959 To link to this article: https://doi.org/10.1080/09670262.2010.490959 Published online: 26 Aug 2010. Submit your article to this journal Article views: 777 View related articles Citing articles: 10 View citing articles Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=tejp20 Eur. J. Phycol. (2010) 45(3): 308–326 A revised classification of the Sphacelariales (Phaeophyceae) inferred from a psbC and rbcL based phylogeny STEFANO G. A. DRAISMA1, WILLEM F. PRUD’HOMME VAN REINE2 AND HIROSHI KAWAI3 1Institute of Ocean & Earth Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia 2Netherlands Centre for Biodiversity Naturalis (section NHN), Leiden University, P.O. Box 9514, 2300 RA, Leiden, The Netherlands 3Kobe University Research Center for Inland Seas, Rokkodai, Kobe 657-8501, Japan (Received 19 April 2010; revised 19 April 2010; accepted 1 May 2010) Phylogenetic relationships within the brown algal order Sphacelariales and with its sister group were investigated using chloroplast-encoded psbC and rbcL DNA sequences. A pilot study with 21 non-sphacelarialeans, representing nine orders (and some incertae sedis taxa), showed a strongly supported monophyly of the Sphacelariales with its sister taxa Phaeostrophion irregulare, Bodanella lauterborni and Heribaudiella fluviatilis. These three taxa were selected as outgroup for further analyses including DNA sequences of 30 sphacelarialean specimens representing all but two of the recognized genera (Phloiocaulon and Ptilopogon were not sampled). Bayesian Inference and Maximum Likelihood trees showed some incon- gruence with Maximum Parsimony trees. Trees based on rbcL showed some incongruence with trees based on psbC and combined alignments. Phylogenetic results were used as the basis for a newly proposed classification of the Sphacelariales that reflects evolutionary history. The Sphacelariales is subdivided into four families: Cladostephaceae (monotypic), Sphacelariaceae, Stypocaulaceae, and a newly created monotypic family Sphacelodermaceae to incorporate Sphaceloderma caespitula, comb. nov. (former Sphacelaria caespitula). Sphacelaria radicans is transferred to a newly created genus Protohalopteris and classified in the Stypocaulaceae, which also contains the two unsampled genera Phloiocaulon and Ptilopogon as well as the genus Halopteris. The genera Stypocaulon and monotypic Alethocladus were merged with Halopteris. The Sphacelariaceae were subdivided into six genera including Sphacelaria (consisting only of the former subgenus Propagulifera) and the monotypic Sphacella. Herpodiscus durvillaeae, Sphacelaria pulvinata and the Sphacelaria subgenera Bracteata and Reinkea were merged in an emended Herpodiscus. A new genus Sphacelorbus was created for Sphacelaria nana. Battersia was reinstated for Sphacelaria mirabilis and the subgenus Pseudochaetopteris, except for Sphacelaria plumosa for which Chaetopteris was reinstated. Key words: Battersia, Chaetopteris, Cladostephaceae, Herpodiscus, Protohalopteris gen. nov., psbC, rbcL, Sphacelariales, Sphacelodermaceae fam. nov., Sphacelorbus gen. nov. Introduction and by a temporary blackening of the cell wall Members of the brown algal order Sphacelariales when treated with an aqueous solution of sodium Migula occur from the Arctic to the tropics, but hypochlorite bleach (Prud’homme van Reine, the main centres of distribution are along 1993; de Reviers & Rousseau, 1999). The family the coasts of Europe, southern Australia and Choristocarpaceae Kjellman was originally New Zealand (Prud’homme van Reine, 1993). included in the order, but its members are haplos- The tropical species are all representatives of the tichous and do not show the characteristic Sphacelaria subgenus Propagulifera Prud’homme response to bleach. When DNA sequence data which are characterized by bearing propagules, became available, these taxa were removed from i.e. specialized branchlets for vegetative propaga- the Sphacelariales. The new family Onslowiaceae tion. The Sphacelariales in general are character- Draisma et Prud’homme (Draisma & Prud’homme ized by a polystichous thallus (although the van Reine, 2001) and new order Onslowiales monotypic genus Sphacella Reinke is haplosti- Draisma et Prud’homme (in Phillips et al., 2008) chous) growing from conspicuous apical cells, were created for the two oligostichous genera Onslowia Searles and Verosphacela E.C. Henry. Correspondence to: Stefano Draisma. E-mail: sgadraisma@ Kawai et al. (2007) reinstated the family um.edu.my Discosporangiaceae O.C. Schmidt and the order ISSN 0967-0262 print/ISSN 1469-4433 online/10/03000308–326 ß 2010 British Phycological Society DOI: 10.1080/09670262.2010.490959 Published online 26 Aug 2010 Sphacelariales revisited and revised 309 Discosporangiales O.C. Schmidt for the genus Phaeostrophiaceae H. Kawai et al., Pseudo- Discosporangium Falkenberg and also included lithoderma roscoffense Loiseaux, and/or the fresh- the Choristocarpaceae (with the monotypic genus water genera Bodanella W. Zimmermann and Choristocarpus Zanardini) in this order. The Heribaudiella Gomont (currently incertae sedis) Sphacelariales sensu stricto (s.s.) currently consists form the sister clade of the Sphacelariales (Kawai of two families, i.e. the Sphacelariaceae Decaisne et al., 2005; de Reviers et al., 2007; McCauley & emend. Oltmanns and the Stypocaulaceae Wehr, 2007; Bittner et al., 2008; Phillips et al., Oltmanns, after Draisma et al. (2002) concluded 2008). that the monotypic Cladostephaceae Oltmanns The aim of this study was to reconstruct the should be merged with the Sphacelariaceae based phylogeny of the Sphacelariales on the basis of a on DNA sequence data of the chloroplast- combined analysis of psbC and rbcL DNA encoded gene for the large subunit of RuBisCO sequences and an improved taxon sampling with (rbcL). Draisma et al.’s (2002) molecular phyloge- more representatives of the southern hemisphere netic analysis of the Sphacelariales s.s. included than in Draisma et al. (2002) and more closely representatives of both families and six out of related outgroup taxa (Bodanella, Heribaudiella eight recognized genera: Cladostephus C. Agardh, and Phaeostrophion Setchell et N.L. Gardner) to Sphacelaria Lyngbye, Sphacella Reinke improve resolution within the Sphacelariales. The (Sphacelariaceae), Alethocladus Sauvageau, length of the alignment was twice that in Draisma Halopteris Ku¨tzing, and Stypocaulon Ku¨tzing et al. (2002) and a complete rbcL sequence of (Stypocaulaceae). The Stypocaulaceae genera Sphacelaria radicans (Dillwyn) C. Agardh was Phloiocaulon M. Geyler and Ptilopogon Reinke now included in the analysis. Draisma et al. were not represented. Four main clades were (2002) inferred phylogenies using Maximum resolved. One main clade was formed by the Parsimony and Maximum Likelihood methods. Stypocaulaceae. The Sphacelariaceae (including In the present study Bayesian Inference was also Cladostephus) formed another main clade with applied. The inferred phylogeny was used as the the exception of Sphacelaria radicans (Dillwyn) basis for a revision of the subdivision of the order. C. Agardh and Sphacelaria caespitula Lyngbye, which each formed a monotypic clade. No sup- Materials and methods port was found for relationships between any of the four main clades. This may in part be Taxon sampling explained by the fact that only half of the rbcL Taxa used in the phylogenetic analyses are listed in sequence was determined for Sphacelaria radicans. Table 1. Taxa from the Kobe University Macroalgal Southern hemisphere representatives were conspic- Culture Collection in Japan (vouchers starting with uously missing in the study by Draisma et al. ‘KU’) were provided as DNA extracts and in addition (2002), with the exception of Antarctic Dr Takeaki Hanyuda (Kobe) provided rbcL sequences Alethocladus corymbosus (Dickie) Sauvageau. of the specimens KU-508 and KU-1118. Additional cul- Draisma et al. (2002) discussed the possibilities tures were ordered from the Culture Collection of Algae for a new classification of the Sphacelariales, but at Go¨ttingen in Germany (vouchers starting with (considering their limited taxon sampling and ‘SAG’). The Sphacelariales species in Draisma et al. incompletely resolved phylogeny) refrained from (2002) are represented in this study by the same individ- ual specimens and DNA extracts with the exception of proposing any formal change. Meanwhile, Sphacelaria radicans. Therefore, a new rbcL sequence Heesch et al. (2008) demonstrated that was determined for S. radicans in order to confirm con- Herpodiscus durvillaeae (Lindauer) South should specificity. Pseudolithoderma roscoffense was not avail- also be transferred to the Sphacelariales. able for this study and therefore its psbC sequence could Herpodiscus durvillaeae, the only species in its not be determined. Herpodiscus durvillaeae specimens genus, forms a branch
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