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Patterns of Molecular and Morphological Variation in Leucobryum Albidum, L

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Patterns of Molecular and Morphological Variation in Leucobryum Albidum, L Patterns of Molecular and Morphological Variation in Leucobryum albidum, L. glaucum, and L. juniperoideum (Bryopsida) Author(s): Alain Vanderpoorten, Sandra Boles, A. Jonathan Shaw Source: Systematic Botany, 28(4):651-656. 2003. Published By: The American Society of Plant Taxonomists URL: http://www.bioone.org/doi/full/10.1043/02-47.1 BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/page/terms_of_use. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder. BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. Systematic Botany (2003), 28(4): pp. 651±656 q Copyright 2003 by the American Society of Plant Taxonomists Patterns of Molecular and Morphological Variation in Leucobryum albidum, L. glaucum,andL. juniperoideum (Bryopsida) ALAIN VANDERPOORTEN,1 SANDRA BOLES, and A. JONATHAN SHAW Duke University, Department of Biology, Durham, North Carolina, 27708 1Author for correspondence. Present address: University of LieÁge, Dept. of Life Sciences, B-22, Sart Tilman, B-4000 LieÁge, Belgium ([email protected]) Communicating Editor: Wendy B. Zomlefer ABSTRACT. Restriction digest patterns from 18S±26S nuclear ribosomal DNA internal transcribed spacers (ITS) were employed to investigate delineation between the morphologically similar moss species Leucobryum glaucum, L. juniperoideum, and L. albidum. Discriminant analysis allowed assignment of specimens to haplotypes based on their morphological features and supported the recognition of L. glaucum and L. albidum. In contrast, L. albidum and L. juniperoideum both corresponded to the same haplotype. Many populations could be readily assigned to either L. glaucum or L. albidum by their morphological features. However, morphological variation between these two species was continuous and one of the ITS haplotypes could not be unambiguously characterized by its morphology. Genetically and morphologically identi®able specimens of L. albidum were sampled in Europe and North America, in contrast to the traditional interpretation of L. albidum as a North American endemic. Although L. albidum seems to have a more southern-Atlantic distribution pattern than L. glaucum, the two species occupy broadly overlapping geographic ranges and were sometimes found intermixed. The moss ¯oras of Europe and North America pos- (Crundwell 1972; Crum and Anderson 1981; Touw and sess a comparable diversity of about 1100±1500 spe- Rubers 1989). Other characters, including the number cies. Sixty-eight genera (approximately 1/5 of the total of laminal cells between the costa and the leaf margin, number) are represented by the same species in Eu- the shape of the costa in cross-section, and the shape rope and North America and probably belong to an of the leaf apex, have also been proposed to distin- old common stock of Laurasian taxa (Frahm and Vitt guish the species. The taxonomic utility of these ga- 1993). In one such genus, Leucobryum, two species, L. metophytic characters, however, varies from one geo- albidum (Brid. ex P. Beauv.) Lindb. and L. glaucum graphic region to another (Smith 1978; Crum and An- (Hedw.) AÊ ngstr., were reported from Europe and derson 1981; Nyholm 1986; Yamaguchi 1993; Nebel North America until Pilous (1962) interpreted the Eu- and Philippi 2000). More problematically, these char- ropean plants named L. albidum as a third species, L. acters do not always co-vary, sometimes con¯ict with juniperoideum (Brid.) MuÈ ll. Hal. This species concept plant size or sporophytic features (Touw and Rubers has generally been accepted in Europe (see e.g., Corley 1989), or are interpreted differently by various authors. et al. 1981). Leucobryum albidum was subsequently re- For example, the ratio of leaf base to leaf acumen is ported from Macaronesia (DuÈ ll 1980), but the record one of the key characters used in North American and has been questioned (Eggers 1982). European treatments to separate L. glaucum from L. The taxonomic status of these three Leucobryum spe- albidum or L. juniperoideum, respectively. In North cies has been somewhat controversial owing to mor- America, a leaf acumen as long as to twice as long as phological intergradation. The most reliable features the leaf base is used to distinguish L. glaucum from L. for distinguishing them are sporophytic, and even albidum (Crum and Anderson 1981), whereas the re- those authors who argue that the species are distinct verse trend has been described in most European ¯o- acknowledge the dif®culties distinguishing them ras between L. glaucum and L. juniperoideum (e.g., based on gametophytic characters alone (e.g., Smith Smith 1978; Frey et al. 1995). 1978; Crum and Anderson 1981). Unfortunately, the Leucobryum glaucum has been reported in both Eur- species are dioicous and rarely produce sporophytes. asia and North America from a variety of habitats Hence, species identi®cation relies heavily on gameto- ranging from xeric sandy sites to Sphagnum bogs (Ire- phytic features, especially the size and structure of the land 1982; Yamaguchi 1993; Dierssen 2001), whereas L. peculiar costa. Costal anatomy consists of several lay- juniperoideum tends to occur in the driest part of that ers of hyaline cells (leucocysts) above and below a cen- range (Crundwell 1972). In addition, L. glaucum has a tral layer of small chloroplyllose cells (chlorocysts). Al- more northern distribution than L. albidum in North though some specimens of Leucobryum can be readily America or L. juniperoideum in Europe. Such observa- identi®ed using gametophytic characters, comparable tions raise the possibility that morphological differenc- patterns of intergradation have been reported among es simply re¯ect habitat variation. As a result, L. jun- the larger, widespread species L. glaucum and the iperoideum and L. glaucum have sometimes been syn- smaller, vicariant species L. albidum and L. junipero- omized (Touw and Rubers 1989) while the status of L. ideum in North America and in Europe, respectively albidum has been debated (Crum and Anderson 1981). 651 652 SYSTEMATIC BOTANY [Volume 28 However, Patterson et al. (1998) reported in a recent TABLE 1. Voucher information. All specimens are at DUKE. study that restriction fragments of DNA ampli®ed by Haplotypes were assigned based on molecular data, which sug- gest that haplotypes G and H1 correspond to L. glaucum, haplo- polymerase chain reaction (PCR) exhibited different type A to L. albidum, and haplotype H2 to a cryptic species, a patterns of variation between morphologically contin- hybrid, or a molecular variant of the two former species. uous populations of L. albidum and L. glaucum from a single North Carolina locality. H1-1 (Belgium, Bruxelles-Capitale, acidic humus in Fagus syl- The analysis of length polymorphism in restriction vatica forest; Vanderpoorten 1040). H1-2 (France, Ardennes, acidic humus in forest; Sotiaux 13900). H1-3 (Poland, PomeÂr- fragments of ampli®ed DNA (hereafter, PCR-RFLP) of- anie occidentale, mixed humid forest; Liseweski et al. 138). H1- ten enables the distinction among closely related spe- 4 (Belgium, LieÁge, forest slope, under Calluna vulgaris; Sotiaux cies (Grechko et al. 1997) and has therefore been used 15273). H1-5 (Belgium, Antwerpen, in wood, near a ¯oating as a molecular marker to address taxonomic problems meadow; Sotiaux 18857). H1-6 (Japan, Hokkaido, moist hu- (e.g., Isshiki et al. 1998; Vivek and Simon 1999; He et mus, ca. 30m; Yamaguchi 18780). H1-7 (Japan, Hokkaido, moist humus, ca. 30m; Yamaguchi 18774). H1-8 (Japan, Hokkaido, al. 2000; Parani et al. 2001). In bryophytes, the internal moist humus, ca. 30m; Yamaguchi 18773). H2-1 (France, Ile de transcribed spacers of nuclear ribosomal DNA (ITS) France, acidic humus in Fagus-Quercus forest; Vanderpoorten have been increasingly used to address taxonomic 2230). H2-2 (France, Champagne-Ardennes, base of a tree; So- problems at the speci®c and infra-speci®c levels (Co- tiaux 16473). H2-3 (Belgium, Luxembourg, siliceous rocks; So- tiaux 16671). G1 (Canada, Newfoundland, shaded base of out- lacino and Mishler 1996; Shaw 2000; Shaw and Allen crops, blackhead highland with outcrops knobs and bogs; 2000; Vanderpoorten et al. 2001; Quandt et al. 2001). Scho®eld 101062). G2 (Canada, Nova Scotia, humus on forest In this paper, we employ restriction digest patterns ¯oor; Belland & Scho®eld 16704). G3 (USA, Minnesota, soil over from nuclear ribosomal DNA ITS sequences to inves- rock under Picea mariana, Pinus banksiana, Abies; Bowers 22343). tigate species delineation between L. glaucum, L. juni- G4 (Denmark, Sjaelland, Alnus glutinosa swamp; McMurray 030M). G5 (Hungary, Zemplen Mts, forested slopes; Scho®eld peroideum,andL. albidum. Morphological measure- 104672). G6 (France, Ile de France, acidic Sphagnum bog; Van- ments were made on the same plants to assess corre- derpoorten
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