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Australian Endangered Orchid, Microtis Angusii: an Evaluation of the Utility of Dna Barcoding

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Australian Endangered Orchid, Microtis Angusii: an Evaluation of the Utility of Dna Barcoding Lankesteriana International Journal on Orchidology ISSN: 1409-3871 [email protected] Universidad de Costa Rica Costa Rica FLANAGAN, NICOLA S.; PEAKALL, ROD; CLEMENTS, MARK A.; OTERO, J. TUPAC MOLECULAR GENETIC DIAGNOSIS OF THE ‘TAXONOMICALLY DIFFICULT’ AUSTRALIAN ENDANGERED ORCHID, MICROTIS ANGUSII: AN EVALUATION OF THE UTILITY OF DNA BARCODING. Lankesteriana International Journal on Orchidology, vol. 7, núm. 1-2, marzo, 2007, pp. 196-198 Universidad de Costa Rica Cartago, Costa Rica Available in: http://www.redalyc.org/articulo.oa?id=44339813040 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): 196-198. 2007. MOLECULAR GENETIC DIAGNOSIS OF THE ‘TAXONOMICALLY DIFFICULT’ AUSTRALIAN ENDANGERED ORCHID, MICROTIS ANGUSII: AN EVALUATION OF THE UTILITY OF DNA BARCODING. 1,3,5 1 2 2, 4 NICOLA S. FLANAGAN , ROD PEAKALL , MARK A. CLEMENTS & J. TUPAC OTERO 1 School of Botany and Zoology, The Australian National University, Canberra, ACT 0200, Australia. 2 Centre for Plant Biodiversity Research, GPO Box 1600 Canberra ACT 2601, Australia. 3 Genetics & Biotechnology, University College Cork, Ireland 4 Dept. de Ciencias Agricolas, Universidad Nacional de Colombia, Palmira, Valle, Colombia 5 Author for correspondence: [email protected] KEY WORDS: Species diagnosis, barcoding, practical outcomes, clonality, Internal Transcribed Sequences (ITS), Single Nucleotide Polymorphisms (SNPs) As species are the common currency for conserva- to the endangered Australian orchid, Microtis angusii tion efforts, their accurate description is essential for (Flanagan et al. 2006). This species was recently efficient preservation of biological diversity. The use described from a single location in New South of DNA Barcodes, short DNA sequences that evolve Wales, Australia, consisting of approximately 100 fast enough to differentiate species, has been pro- plants (Jones 1996). Microtis species commonly posed both for the discovery of new species and the exhibit clonal growth (Peakall & Beattie 1989, 1991), identification of previously described species. The and it was highly likely that the plants present at the first objective remains controversial, with a strong type location represented a small number of clones. argument that species discovery be based on Additionally, the site had been subject to various ‘Integrated Barcodes’, including multiple sources of threatening processes such as road improvements and data (see Rubinoff 2006a). In contrast, once a species encroachment by invasive plants. Microtis angusii has been described, including for molecular sequence was listed as a nationally endangered species on data at barcoding loci, the use of a DNA barcode may Schedule 1 of the Australian Commonwealth facilitate the identification of the species, particularly Endangered Species Protection Act 1992 in 1997. in cases where recognition based on easily-visualised The genus Microtis has been relatively neglected characters is problematic. taxonomically, possibly because of their inconspic- Nonetheless, the use of the DNA Barcoding uous small, green, often ant-pollinated flowers. approach for species diagnosis pre-supposes a compre- Microtis angusii is morphologically very similar to hensive understanding of the circumscription of the more common, widespread relatives, and easily species under study. In reality this is very rarely true, confused, even by experienced field biologists. In as it requires the combination of multiple lines of accordance with the New South Wales Threatened investigation, which, in the case of orchids include pol- Species Conservation Act, a recovery plan for the linator observations and manual cross pollination, in species was prepared in order to ensure self-sustain- addition to morphological and molecular character ing populations in the wild. For this, the identifica- analysis (Peakall 2007). Thus, while ideally the sole tion of further populations of M. angusii was highly use of DNA Barcoding should be limited to species desirable, but hindered by difficulties in species diagnosis, in practice it may often yield further data to recognition. be set against the working hypothesis of species status, Conservation practitioners identified six potential thus contributing to species delineation and discovery. populations of M. angusii, and requested a genetic We present a study of the application of barcoding study to provide confirmation of their con-specific sta- FLANAGAN et al.- Conservation genetics of Microtis angusii. 197 tus for the recovery plan. We investigated patterns of including all ITS haplotypes identified in the original molecular genetic variation in both Amplified Fragment genetic survey, and samples from a previously Length Polymorphisms (AFLPs) and DNA sequence uncharacterized population. Microtis angusii samples (rDNA ITS) loci, compared to that of the type popula- were successfully discriminated from amongst the tion and known examples of potentially confounding, several congeners, and the further, previously congeneric species. The type population was invariable unknown, population was diagnosed as M. angusii. across 122 AFLP markers. Of the six potential popula- Sequencing of the ITS locus for these individuals tions only two were identified unambiguously as M. confirmed this PCR diagnosis. angusii, having identical ITS sequences and highly sim- While these studies demonstrate the application ilar AFLP profiles. Three populations collected showed of DNA Barcoding for species diagnosis of the a high genetic affinity to the related species M. parviflo- endangered M. angusii, it must be emphasized that ra, including identical ITS sequences, while a fourth further morphological and ecological studies of the population was diagnosed, on the basis of the molecular genus Microtis are sorely needed in order to unam- data, to be M. rara. biguously define the species boundaries in the A subset of samples from one of the populations genus. As has been recognized by Rubinoff was most similar to, but not identical to M. angusii (2006b), amongst other authors, sole reliance on across the genetic loci. This genetically-distinct DNA sequence data at one, or a few loci, may mis- clade may represent an additional previously- lead conservation efforts, either by making deci- unknown species. Alternatively, given the clonal sions on species status based on characters that are nature of the Microtis genus, this geographically not species-specific, or by diverting resources from distant population may represent a highly differenti- broader studies that are ultimately more capable of ated conspecific population. Clonality, in combina- providing robust species circumscriptions. It is tion with high selfing rates due to restricted ant pol- imperative that, in the reality of limited funds for lination (Peakall & Beattie 1989, 1991) are traits conservation research, priority must be given to that will act to reduce effective population size, studies that will have direct practical outcome in thereby enhancing the effects of genetic drift and so conservation management. A recent review sug- promoting higher levels of genetic differentiation gested that genetic studies of clonal plants, plants between isolated populations than expected in a with uncertain taxonomic status, and plants target- predominantly outbreeding species. ed for translocation were most likely to result in Whilst barcoding based on complete DNA practical outcomes (Hogbin et al. 2000). sequence data is preferred in order to identify rare, Nonetheless, as the case of Microtis angusii shows, differentiated haplotypes, extensive sequencing pro- even in these scenarios a genetic study is not neces- jects are expensive and beyond the financial capacity sarily sufficient by itself. of many conservation programmes. In order to pro- vide an economical alternative to full sequence char- LITERATURE CITED acterization, we designed a rapid, PCR-based assay Flanagan, N.S., R. Peakall, M.A. Clements & J.T. Otero. for the effective identification of M. angusii from sin- 2006. Conservation of taxonomically difficult species: gle nucleotide polymorphism (SNP) differences seen the case of the Australian orchid, Microtis angusii. in the study of sequence variation at the ITS locus Conservation Genetics 7: 847-859. (Flanagan et al. 2007). The assay was designed to be Flanagan, N.S., R. Peakall, M.A. Clements & J.T. Otero. easily visualized on a standard agarose gel, avoiding 2007. Identification of the endangered Australian orchid, Microtis angusii using an allele-specific PCR assay. the use of expensive restriction enzymes and DNA Conservation Genetics. Online First. sequencing reagents and equipment. Hogbin, P.M., R. Peakall & M.A. Sydes. 2000. Achieving An important aspect of this assay was its validation practical outcomes from genetic studies of rare plants. through the application of a ‘blind trial’. Here the Australian Journal of Botany 48: 375-382. assay was applied to samples of disguised identity, Jones, D.L. 1996. Microtis angusii, a new species of LANKESTERIANA 7(1-2), marzo 2007. © Universidad de Costa Rica, 2007. RD 198 3 IOCC PROCEEDINGS Orchidaceae from Australia. The Orchadian 12: 10-12. of worker ant pollination on a self-compatible, clonal Peakall, R. 2007. Speciation in the Orchidaceae – con- orchid.
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