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Redalyc.SEQUENCING RE-DEFINES SPIRANTHES RELATIONSHIPS Lankesteriana International Journal on Orchidology ISSN: 1409-3871 [email protected] Universidad de Costa Rica Costa Rica DUECK, LUCY A.; CAMERON, KENNETH M. SEQUENCING RE-DEFINES SPIRANTHES RELATIONSHIPS, WITH IMPLICATIONS FOR RARE AND ENDANGERED TAXA Lankesteriana International Journal on Orchidology, vol. 7, núm. 1-2, marzo, 2007, pp. 190-195 Universidad de Costa Rica Cartago, Costa Rica Available in: http://www.redalyc.org/articulo.oa?id=44339813039 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative LANKESTERIANA 7(1-2): 190-195. 2007. SEQUENCING RE-DEFINES SPIRANTHES RELATIONSHIPS, WITH IMPLICATIONS FOR RARE AND ENDANGERED TAXA 1,3 2 LUCY A. DUECK & KENNETH M. CAMERON 1 UGA/Savannah River Ecology Laboratory, Drawer E, Aiken, SC 29802 USA; 2 The New York Botanical Garden, Bronx, NY 10458-5126 USA 3 Author for correspondece: [email protected] KEY WORDS: conservation genetics, endangered species, polyploidy, sequencing, Spiranthes Introduction endemic to one area, but rare throughout its range and unusual as an allopolyploid. Other taxa that can also Species delimitation in the genus Spiranthes L.C. be identified as genetically important as well as rare Richard (Spiranthinae, Cranichideae, Orchidoideae) should be targeted for maintenance of biodiversity. has long been problematic, due mainly to morpholog- Molecular genetic techniques can provide a suite of ical polymorphism confounded by hybridization and markers from which to choose the scale of taxonomic polyploidy, particularly in the S. cernua (L.) Rich. discrimination required (Soltis & Soltis 1998, Soltis species complex (Correll 1950, Luer 1975, Sheviak & Gitzendanner 1998, Avise 2004). Nucleotide 1982). Official records indicate that 462 taxa names sequencing, particularly of several genes in combina- have been used for Spiranthes historically (RBG-Kew tion, is successfully used to address issues of phylo- 2006), but less than a tenth of those are recognized genetics and species delimitation, critical when con- today, and there is still concern about the species sta- servation resources to protect threatened and endan- tus of some. Although Spiranthes is considered to gered taxa must be focused. It is thus our goal in have a worldwide distribution, only eight of these determining phylogenetic relationships among occur outside of temperate North America. Spiranthes through sequence analysis to help identify All 26 currently recognized Spiranthes taxa in the these unique taxa and verify the taxonomic status of Flora of North America (Sheviak & Brown 2002) the endemic group members. Circumscribing the have some form of conservation listing in a U.S. state genetic individuality of these species of concern is a (except S. casei var. novascotiae Catling, found only basic foundation on which to build further conserva- in Canada), due mainly to tenuous occurrence at the tion efforts. edge of their range in those locations. The less-seri- ous listing denominations include: Exploitatively Methods Vulnerable, Rare, Sensitive, and Special Concern. Two unrecognized taxa are other exceptions – S. ame- As part of a larger Spiranthes phylogeny project, siana (either extirpated or a synonym for S. torta all 27 taxa found in temperate North America have [Thunb.] Garay & H.R.Sweet) is Proposed now been sampled except S. casei var. novascotiae Endangered by Florida due to endemicity and rarity, and S. ovalis var. ovalis. Voucher specimens, when and newly described S. sylvatica P.M.Brown (Brown available, were deposited in the Clemson (SC) 2001a) has not been listed by any state. University herbarium (CLEMS). Three Spiranthes Most of these Spiranthes taxa are also federally or found in Europe and Asia (S. aestivalis [Poir.] Rich., state-listed as Threatened, Proposed Endangered, or S. sinensis [Pers.] Ames, S. spiralis [L.] Chevall.), as Endangered (Table 1). However, some taxa, such as well as an outgroup taxon (Sacoila lanceolata var. those endemic to or now limited to one or few loca- lanceolata [Aubl.] Garay), were also included in the tions, should be targeted for special protection. These analyses. include: S. brevilabris Lindl., S. delitescens Sheviak, DNA was extracted from the plant tissue, and four S. eatonii Ames ex P.M.Br., S. floridana (Wherry) genes/regions representing all three genomes were Cory, S. infernalis Sheviak, S. parksii Correll, and S. sequenced according to protocols outlined in Dueck torta. Federally threatened S. diluvialis Sheviak is not et al. (2005). The DNA segments analyzed include DUECK & CAMERON – Sequencing Spiranthes for T&E taxa identification 191 TABLE 1. Critical conservation listings for Spiranthes in the U.S. LANKESTERIANA 7(1-2), marzo 2007. © Universidad de Costa Rica, 2007. RD 192 3 IOCC PROCEEDINGS two plastid regions – a non-coding section of trnS-fM nicamporum Sheviak (not shown). A moderately sup- and the trnL intron, one non-coding region in mito- ported division (81%) within the lower paraphyletic chondrial gene NAD7, and the nuclear ribosomal ITS grade separates the latter five species from strong region including ITS 1, 5.8S, and 2. Resulting elec- clades of combined S. praecox (Walter) S.Watson tropherograms were contiged and edited, and the four and S. sylvatica (no distinction between them shown matrices of consensus sequences were aligned. These from this analysis), all three Old World species, and data sets were then analyzed using the parsimony cri- S. tuberosa Raf. The upper group contains a moder- terion in PAUP*, and support values for relationships ately supported clade of closely related species, with were calculated by performing jackknife analyses of S. brevilabris and S. floridana as distinct, but with S. 5000 replicates. Since the separate gene trees were eatonii and S. lacera as indistinguishable from each concordant, data were also combined and analyzed other. S. vernalis Engelm. & A.Gray, S. laciniata together, but only samples complete for all four genes (Small) Ames, and S. longilabris Lindl. are mono- were included. phyletic and thus strongly supported species. S. ovalis Because the main project is still in progress, how- var. erostellata appears as a strongly supported sub- ever, the four-gene cladogram shown here (from June clade within a broad unsupported S. magnicam- 2006) does not include many samples subsequently porum-S. odorata (Nutt.) Lindl. group. S. odorata is collected. These later samples have been sequenced, polyphyletic, appearing within no fewer than three but their analyses not rigorously tested yet, so their different clades. The two remaining derived clades results will be discussed as preliminary findings only. consist of moderately strong support (86%) for a S. cernua-S. parksii clade in which S. parksii is indistin- Results guishable, and an unsupported clade with S. casei Catling & Cruise and S. ochroleuca (Rydb.) Rydb. Of the 123 total samples analyzed by June 2006, 99 separate but also unsupported. No distinct identity for samples were complete with all four gene sequences S. cernua was supported from these samples and and thus were used to produce the figure included. analysis. Two taxa subsequently sampled (S. porrifolia Lindl., Preliminary results from “work-in-progress” analy- S. torta) were not included in this analysis, but their ses (not shown) indicate some important findings for placement is discussed below in light of more recent species of interest to conservation biologists. analyses. Other taxa not included due to unavailabili- Differentiation of S. eatonii from S. lacera was not ty are S. casei var. novascotiae, S. lacera var. lacera resolved by additional S. lacera samples. S. porrifolia (Raf.) Raf., and S. ovalis var. ovalis Lindl. Over 3500 is very closely related to S. infernalis and in fact may base pairs (bp) were used in the combined analysis, be hybridizing in the southwestern limits of its range, and statistically the ITS 1-2 segment had the most but the clade containing both species are distinct from variable (26%) and informative (18%) sites. and sister to S. romanzoffiana. Our samples of S. However, the trnS-fM segment had the best-resolved torta are sister to S. laciniata (and both to S. bre- topology for a single-gene tree (not shown). vilabris) in the maternal genomes, but to S. floridana A strict consensus cladogram of the Spiranthes when the nuclear genome is included. And although phylogeny based on the four-gene combined analysis inclusion of more samples of S. cernua is providing a is shown in Figure 1, with jackknife support values better species identity for it along a northeastern added above branches. There is strong support (99%) Appalachian swath, S. parksii remains imbedded for a division of the genus into two major groups with within the clade of southern S. cernua. some strong species clades within each. The lower group, a paraphyletic grade of taxa, contains distinct Discussion species S. infernalis and S. lucida (H.H.Eaton) Ames, and a weakly supported S. romanzoffiana Cham. For the first time, our phylogeny of Spiranthes, based clade in which strongly supported S. delitescens and on molecular data from all three genomes, is revealing unsupported but separate S. diluvialis reside. In single the relationships among taxa found in the United States trees from maternally inherited plastid and mitochon- and abroad.
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