Molecular phylogenetic study of the tribe Tropidieae (Orchidaceae, Epidendroideae) with taxonomic and evolutionary implications

PhytoKeys
Izai A B Sabino KikuchiHirokazu Tsukaya

Abstract

The orchid tribe Tropidieae comprises three genera, Tropidia, Corymborkis and Kalimantanorchis. There are three fully mycoheterotrophic species within Tropidieae: Tropidia saprophytica, T. connata and Kalimantanorchis nagamasui. A previous phylogenetic study of K. nagamasui, based only on plastid matK data, placed K. nagamasui outside the clade of Tropidia and Corymborkis without support. In this study, we performed phylogenetic analyses using a nuclear ribosomal DNA spacer (ITS1-5.8S-ITS2), a low-copy nuclear coding gene (Xdh) and a mitochondrial intron (nad1b-c intron) to study the phylogenetic relationships within Tropidieae. We included six photosynthetic and all three fully mycoheterotrophic Tropidieae species. The resulting phylogenetic trees placed these fully mycoheterotrophic species inside the Tropidia clade with high support. In our trees, these three species do not form a monophyletic group together, because the photosynthetic T. graminea is nested amongst them. Our results also suggest that the loss of photosynthetic ability occurred at least twice in Tropidia.

References

Mar 23, 2004·Nucleic Acids Research·Robert C Edgar
Jun 25, 2008·BMC Evolutionary Biology·Vincent MerckxErik F Smets
Aug 6, 2010·Annals of Botany·Hiroyuki MotomuraTomohisa Yukawa
Feb 24, 2012·Systematic Biology·Fredrik RonquistJohn P Huelsenbeck
Nov 6, 2014·Molecular Biology and Evolution·Lam-Tung NguyenBui Quang Minh
Aug 28, 2015·Proceedings. Biological Sciences·Thomas J GivnishKenneth M Cameron
Feb 3, 2016·The New Phytologist·Gerhard GebauerAndreas C Gebauer
Aug 7, 2017·PhytoKeys·Izai Alberto Bruno Sabino Kikuchi, Hirokazu Tsukaya
Oct 28, 2017·Molecular Biology and Evolution·Diep Thi HoangLe Sy Vinh
May 7, 2019·Molecular Biology and Evolution·Craig F BarrettAaron H Kennedy

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Methods Mentioned

BETA
PCR

Software Mentioned

PartitionFinder
FigTree
MUSCLE
TREE
IQ
Geneious Pro
Geneious Prime
MrBayes

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