Molecular phylogenetic species delimitation in the aquatic genus Ottelia (Hydrocharitaceae) reveals cryptic diversity within a widespread species.

Authors:
Yu Ito
Yu Ito
University of Canterbury
Norio Tanaka
Norio Tanaka
Graduate School of Science and Engineering
Japan
Anders S Barfod
Anders S Barfod
Aarhus University
Josef Bogner
Josef Bogner
Botanischer Garten
Berlin | Germany
Jie Li
Jie Li
Peking University School of Nursing
TA
Beijing , China | China
Okihito Yano
Okihito Yano
Okayama University of Science
Japan

J Plant Res 2019 May 16;132(3):335-344. Epub 2019 Apr 16.

Kadoorie Farm and Botanic Garden, Lam Kam Road, Tai Po, Hong Kong, People's Republic of China.

Ottelia, a pantropical genus of aquatic plants belonging to the family Hydrocharitaceae, includes several narrowly distributed taxa in Asia. Although the Asian species have received comparatively more research attention than congeners in other areas, various key taxonomic questions remain unaddressed, especially with regards to apparent cryptic diversity within O. alismoides, a widespread species complex native to Asia, northern Australia and tropical Africa. Here we test taxonomic concepts and evaluate species boundaries using a phylogenetic framework. We sampled five of the seven species of Ottelia in Asia as well as each species endemic to Africa and Australia; multiple samples of O. alismoides were obtained from across Asia. Phylogenetic trees based on five plastid DNA markers and the nuclear ITS region shared almost identical topologies. A Bayesian coalescent method of species delimitation using the multi-locus data set discerned one species in Africa, one in Australia and four in Asia with the highest probability. The results lead us to infer that a population sampled in Thailand represents a hitherto unrecognised cryptic taxon within the widespread species complex, although the apparent lack of unambiguous diagnostic characters currently precludes formal description. Conversely, no molecular evidence for distinguishing O. cordata and O. emersa was obtained, and so the latter is synonymised under the former. Two accessions that exhibit inconsistent positions among our phylogenetic trees may represent cases of chloroplast capture, however incomplete lineage sorting or polyploidy are alternative hypotheses that ought to be tested using other molecular markers.

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http://dx.doi.org/10.1007/s10265-019-01109-7DOI Listing
May 2019
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References

(Supplied by CrossRef)
Article in Syst Biodiv
A Angulo et al.
Syst Biodiv 2010
Article in Mol Phylogenet Evol
BG Baldwin et al.
Mol Phylogenet Evol 1992
Article in PLoS Comput Biol
RR Bouckaert et al.
PLoS Comput Biol 2014
Article in Taxon
MW Chase et al.
Taxon 2007
Article in BMC Evol Biol
LY Chen et al.
BMC Evol Biol 2012

CDK Cook et al.
1996
Article in Aquat Bot
CDK Cook et al.
Aquat Bot 1984
Article in Generic considerations. Aquat Bot
CDK Cook et al.
Generic considerations. Aquat Bot 1983
Article in Trends Ecol Evol
JH Degnan et al.
Trends Ecol Evol 2009
Article in BMC Evol Biol
AJ Drummond et al.
BMC Evol Biol 2007
Article in PLoS Biol
AJ Drummond et al.
PLoS Biol 2006

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