UZH-Logo

Maintenance Infos

Molecular phylogeny of Aerides (Orchidaceae) based on one nuclear and two plastid markers: a step in understanding the evolution of the Aeridinae


Kocyan, A; Vogel, E F; Conti, E; Gravendell, B (2008). Molecular phylogeny of Aerides (Orchidaceae) based on one nuclear and two plastid markers: a step in understanding the evolution of the Aeridinae. Molecular Phylogenetics and Evolution, 48(2):422-443.

Abstract

Phylogenetic relationships of the orchid genus Aerides (Epidendroideae, Vandeae, Aeridinae) from Southeast Asia were inferred from DNA sequences of one nuclear (nrITS) and two plastid (matK, trnL-trnL-F) regions of 48 taxa (21 Aerides, 25 other Aeridinae, 2 outgroup). Analyses of the combined datasets with parsimony, maximum likelihood and Bayesian methods revealed that Aerides is monophyletic and consists of three well-supported subclades which are only partly in accordance with previous sectional delimitations based on floral characters. The two different flower types in Aerides (hidden versus open spur entrance) seem to have evolved at least twice in geographically distinct areas. The phylogeny presented here is yet another example in Orchidaceae where floral morphology cannot be relied on to reconstruct phylogenetic history but rather is the result of pollinator-driven selection. The Aerides subclades are characterized by three different length classes of the mutation-rich P8 region in the trnL intron. To our knowledge, this is the first time that the P8 region was studied in orchids. The matK gene has been assumed to be a pseudogene in orchids due to occasional occurrence of frameshift indels, low transition/transversion (ts:tv) ratios and low substitution rates at the 3rd codon position. However, matK does not appear to be a pseudogene in Aerides and a comparison with data from other angiosperms suggests that ts:tv ratios and low substitution rates have been overestimated as arguments for a pseudogene status of matK in orchids.

Phylogenetic relationships of the orchid genus Aerides (Epidendroideae, Vandeae, Aeridinae) from Southeast Asia were inferred from DNA sequences of one nuclear (nrITS) and two plastid (matK, trnL-trnL-F) regions of 48 taxa (21 Aerides, 25 other Aeridinae, 2 outgroup). Analyses of the combined datasets with parsimony, maximum likelihood and Bayesian methods revealed that Aerides is monophyletic and consists of three well-supported subclades which are only partly in accordance with previous sectional delimitations based on floral characters. The two different flower types in Aerides (hidden versus open spur entrance) seem to have evolved at least twice in geographically distinct areas. The phylogeny presented here is yet another example in Orchidaceae where floral morphology cannot be relied on to reconstruct phylogenetic history but rather is the result of pollinator-driven selection. The Aerides subclades are characterized by three different length classes of the mutation-rich P8 region in the trnL intron. To our knowledge, this is the first time that the P8 region was studied in orchids. The matK gene has been assumed to be a pseudogene in orchids due to occasional occurrence of frameshift indels, low transition/transversion (ts:tv) ratios and low substitution rates at the 3rd codon position. However, matK does not appear to be a pseudogene in Aerides and a comparison with data from other angiosperms suggests that ts:tv ratios and low substitution rates have been overestimated as arguments for a pseudogene status of matK in orchids.

Citations

28 citations in Web of Science®
28 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

592 downloads since deposited on 28 Jan 2009
78 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Systematic Botany and Botanical Gardens
Dewey Decimal Classification:580 Plants (Botany)
Language:English
Date:February 2008
Deposited On:28 Jan 2009 19:15
Last Modified:05 Apr 2016 12:54
Publisher:Elsevier
ISSN:1055-7903
Publisher DOI:10.1016/j.ympev.2008.02.017
PubMed ID:18571438
Permanent URL: http://doi.org/10.5167/uzh-11750

Download

[img]
Preview
Content: Accepted Version
Filetype: PDF
Size: 2MB
View at publisher

TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.

Author Collaborations