Taxonomic complexity and breeding system transitions: conservation genetics of the Epipactis leptochila complex (Orchidaceae).

Abstract:

:The genus Epipactis contains a problematical complex of autogamous taxa among which species limits are difficult to define. Different authors have treated these plants in different ways, some recognizing the different taxa as distinct species, others considering them as minor intraspecific variants. These contrasting treatments have a direct impact on the conservation resources and status such plants command; 'endemic orchid species' are perceived as having high conservation value, 'localized minor variants' are not. We used allozyme and chloroplast restriction fragment length polymorphism (RFLP) and sequencing analyses to investigate patterns of population genetic structure underlying the taxonomic complexity in this group. Populations of E. dunensis, E. leptochila and E. muelleri were homozygous and uniform for all loci studied here. There were, however, fixed genetic differences among these taxa. Comparisons with published data from the putative progenitor species for the autogamous taxa (the widespread, allogamous E. helleborine) suggest iterative origins of autogamy, rather than the self-pollinating taxa all being merely mutational variants of a single autogamous lineage.

journal_name

Mol Ecol

journal_title

Molecular ecology

authors

Squirrell J,Hollingsworth PM,Bateman RM,Tebbitt MC,Hollingsworth ML

doi

10.1046/j.1365-294x.2002.01610.x

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

1957-64

issue

10

eissn

0962-1083

issn

1365-294X

pii

1610

journal_volume

11

pub_type

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