Article Dans Une Revue Lankesteriana. International Journal on Orchidology Année : 2007

Allotetraploid evolution in Dactylorhiza (Orchidaceae)

Mark W Chase
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Michael F Fay
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Richard Bateman
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Mikael Hedrén
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Résumé

One of the most perplexing problems in Western European terrestrial orchid taxonomy has been how to deal with the large numbers of taxa that have been described for the allopolyploid taxa, which are the products of hybridization between taxa in the Dactylorhiza maculata (L.) Soó group and the D. incarnata (L.) Soó group (Table 1). The polyploidy hybrids are lumped under the category of D. majalis (Rchb.) P.F.Hunt & Summerh. s.l. (Table 1). By taking their ecology into account, it is clear that offspring from putatively the same parental taxa have different ecological preferences and been given taxonomic recognition as species by many authors. It has also been clear that within each of the parental com-plexes several distinct entities exist, again differing in their ecologies and morphology. Many of the named allotetraploid taxa are highly restricted, and therefore there are conservation implications if such taxa are foci of efforts to prevent them from disappearing. It is therefore appropriate to study such taxa, both on evolutionary and conservation bases.

To study these problems, we employed a genetic approach using two sets of markers, the nuclear ribosomal spacer regions (nrITS) and plastid microsatellites. These were first sequenced to determine if there were differences in length that could be used as characters, which was discovered to be the case. We then designed primers to amplify short fragments (140-200

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ird-05597491 , version 1 (20-04-2026)

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Mark W Chase, Michael F Fay, Richard Bateman, Mikael Hedrén, Yohan Pillon. Allotetraploid evolution in Dactylorhiza (Orchidaceae). Lankesteriana. International Journal on Orchidology, 2007, 7 (1-2), pp.187-189. ⟨ird-05597491⟩
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