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Speciation and relationships in Dactylorhiza

Hedrén, Mikael LU (2005) In Svensk Botanisk Tidskrift 99(2). p.70-93
Abstract
Most of the Scandinavian members of the orchid genus Dactylorhiza are included in the D. incarnata/D. maculata polyploid complex. Molecular data obtained during the last decade have given a better understanding of evolutionary patterns in this complex and explain why it is taxonomically difficult. The data reveal that allotetraploids have been formed repeatedly by hybridization between the same pair of broadly defined parental species, D. incarnata s.lat. and D. maculata s.lat. Some of the widespread allotetraploids are themselves variable and may each consist of several independently derived allotetraploid lineages, or else may have obtained increased levels of diversity by backcrossing with their parental species or by hybridization with... (More)
Most of the Scandinavian members of the orchid genus Dactylorhiza are included in the D. incarnata/D. maculata polyploid complex. Molecular data obtained during the last decade have given a better understanding of evolutionary patterns in this complex and explain why it is taxonomically difficult. The data reveal that allotetraploids have been formed repeatedly by hybridization between the same pair of broadly defined parental species, D. incarnata s.lat. and D. maculata s.lat. Some of the widespread allotetraploids are themselves variable and may each consist of several independently derived allotetraploid lineages, or else may have obtained increased levels of diversity by backcrossing with their parental species or by hybridization with other allotetraploids. Whereas some allotetraploids have wide distribution areas indicating that they should be of relatively high age, other allotetraploids, which may be characterized by odd character combinations, are confined to one or a few populations and may be of recent origins. Because of the intricate variation patterns and the difficulty to subdivide the complex into a series of morphologically discrete species, it is argued that all allotetraploids are best included in a broadly circumscribed D. majalis, at least until additional molecular data regarding taxonomic delimitation have been obtained. Widespread and well-known taxa may be provisionally treated as subspecies. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Svensk Botanisk Tidskrift
volume
99
issue
2
pages
70 - 93
publisher
Svenska Botaniska Föreningen
external identifiers
  • scopus:17644388806
ISSN
0039-646X
language
English
LU publication?
yes
id
237b0cf6-d490-43db-85a4-8e44b2b70ad0 (old id 153118)
date added to LUP
2007-07-02 10:44:23
date last changed
2017-01-01 06:40:35
@article{237b0cf6-d490-43db-85a4-8e44b2b70ad0,
  abstract     = {Most of the Scandinavian members of the orchid genus Dactylorhiza are included in the D. incarnata/D. maculata polyploid complex. Molecular data obtained during the last decade have given a better understanding of evolutionary patterns in this complex and explain why it is taxonomically difficult. The data reveal that allotetraploids have been formed repeatedly by hybridization between the same pair of broadly defined parental species, D. incarnata s.lat. and D. maculata s.lat. Some of the widespread allotetraploids are themselves variable and may each consist of several independently derived allotetraploid lineages, or else may have obtained increased levels of diversity by backcrossing with their parental species or by hybridization with other allotetraploids. Whereas some allotetraploids have wide distribution areas indicating that they should be of relatively high age, other allotetraploids, which may be characterized by odd character combinations, are confined to one or a few populations and may be of recent origins. Because of the intricate variation patterns and the difficulty to subdivide the complex into a series of morphologically discrete species, it is argued that all allotetraploids are best included in a broadly circumscribed D. majalis, at least until additional molecular data regarding taxonomic delimitation have been obtained. Widespread and well-known taxa may be provisionally treated as subspecies.},
  author       = {Hedrén, Mikael},
  issn         = {0039-646X},
  language     = {eng},
  number       = {2},
  pages        = {70--93},
  publisher    = {Svenska Botaniska Föreningen},
  series       = {Svensk Botanisk Tidskrift},
  title        = {Speciation and relationships in Dactylorhiza},
  volume       = {99},
  year         = {2005},
}