Phylogenetics of Dendrochilum (Orchidaceae): Evidence of pronounced morphological homoplasy and predominantly centric endemism

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Pedersen, Henrik AE.Univ Copenhagen, Nat Hist Museum Denmark, Gothersgade 130, DK-1123 Copenhagen K, Denmark (author)

Phylogenetics of Dendrochilum (Orchidaceae) : Evidence of pronounced morphological homoplasy and predominantly centric endemism

Article/chapterEnglish2019

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2020-02-18
John Wiley & Sons,2019
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LIBRIS-ID:oai:DiVA.org:uu-418736
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-418736URI
https://doi.org/10.1002/tax.12184DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-180407URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

Notes

A phylogenetic hypothesis for the genus Dendrochilum s.l. (including Bracisepalum) is based on nucleotide sequences of the nuclear ribosomal ITS and two plastid regions (matK, ycf1). The trees based on parsimony analysis of the nrITS and plastid partitions, respectively, are largely congruent, the only strongly supported conflict being the exact position of D. arachnites. Maximum likelihood analysis of the combined molecular matrix resulted in a tree with very high topological congruence to the parsimony consensus tree and to a fossil-calibrated Bayesian inference tree that was used for dating. Our results confirm that monophyly of Dendrochilum is only supported if Bracisepalum is included in the former. They also suggest that only two subgenera (Dendrochilum, Platyclinis) should be recognized, whereas all other subgenera and sections previously proposed on a morphological basis should be treated as synonyms of subg. Platyclinis. Indeed, mapping of five vegetative and nine floral characters of alleged systematic value, using DELTRAN and ACCTRAN optimization, demonstrates pronounced morphological homoplasy. Molecular time calibration dates the origin of the genus to the Miocene and contradicts the hypothesis that most extant Dendrochilum species did not evolve until the Holocene. Inferred phylogenetic relationships between extant species, in combination with previously identified hotspots of narrow endemism, suggest that species endemism in Dendrochilum is predominantly centric.

Subject headings and genre

NATURVETENSKAP Biologi Biologisk systematik hsv//swe
NATURAL SCIENCES Biological Sciences Biological Systematics hsv//eng
NATURVETENSKAP Biologi Botanik hsv//swe
NATURAL SCIENCES Biological Sciences Botany hsv//eng
NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
Malesia
maximum likelihood
molecular dating
morphological character mapping
orchids
parsimony

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Petersen, GitteStockholms universitet,Institutionen för ekologi, miljö och botanik,University of Copenhagen, Denmark,Univ Copenhagen, Nat Hist Museum Denmark, Gothersgade 130, DK-1123 Copenhagen K, Denmark; Stockholm Univ, Dept Ecol Environm & Plant Sci, S-10691 Stockholm, Sweden(Swepub:su)gipe0376 (author)
Gravendeel, BarbaraNaturalis Biodivers Ctr, Darwinweg 2, NL-2333 CR Leiden, Netherlands; Univ Appl Sci Leiden, Zernikedreef 11, NL-2333 CK Leiden, Netherlands (author)
Barkman, Todd J.Western Michigan Univ, Dept Biol Sci, Kalamazoo, MI 49008 USA (author)
de Boer, HugoUniv Oslo, Nat Hist Museum, POB 1172, N-0318 Oslo, Norway (author)
Sulistyo, Bobby P.Uppsala universitet,Institutionen för organismbiologi,Naturalis Biodivers Ctr, Darwinweg 2, NL-2333 CR Leiden, Netherlands; Univ Appl Sci Arnhem & Nijmegen, Arnhem, Netherlands (author)
Seberg, OleUniv Copenhagen, Nat Hist Museum Denmark, Gothersgade 130, DK-1123 Copenhagen K, Denmark (author)
Pedersen, Henrik Æ. (author)
Univ Copenhagen, Nat Hist Museum Denmark, Gothersgade 130, DK-1123 Copenhagen K, DenmarkInstitutionen för ekologi, miljö och botanik (creator_code:org_t)

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In:Taxon: John Wiley & Sons68:6, s. 1173-11880040-02621996-8175

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Biological Syste ...

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Botany

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