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Abstract Detail

Pteridological Section/AFS

Zhang, Liang [1], Rothfels, Carl J [2], Ebihara, Atsushi  [3], Schuettpelz, Eric [4], Le Péchon, Timothée [1], Kamau, Peris [5], He, Hai [6], Zhou, Xinmao [1], Prado, Jefferson [7], Field, Ashley [8], Yatskievych, George [9], Gao, Xin-fen [1], Zhang, Libing [10].

A global plastid phylogeny of the brake fern genus Pteris (Pteridaceae) and related genera in the Pteridoideae.

The brake fern genus Pteris belongs to Pteridaceae subfamily Pteridoideae. It contains 200–250 species distributed in all continents except Antarctica, with its highest species diversity in tropical and subtropical regions. The monophyly of Pteris has long been in question because if its great morphological diversity and because of the controversial relationships of the Australian endemic monospecific genus Platyzoma. The circumscription of the Pteridoideae has likewise been uncertain. Previous studies typically had sparse sampling of Pteris species and related genera and used limited DNA sequence data. In present study, DNA sequences of six plastid loci of 146 accessions representing 120 species of Pteris (including the type of the genus) and 18 related genera were used to infer a phylogeny using maximum likelihood, Bayesian inference, and maximum parsimony methods. Our major results include: (1) The previous uncertain relationships of Platyzoma were due to long-branch attraction artifacts; (2) Afropteris, Neurocallis, Ochropteris, and Platyzoma are all embedded within a well-supported Pteris s.l.; (3) It is not necessary to split Pteris s.l. into Pteris s.s. (P. longifolia/P. vittata and allies) and other genera as suggested by earlier studies; (4) The traditionally circumscribed Jamesonia is paraphyletic in relation to a monophyletic Eriosorus; (5) Pteridoideae contains 15 genera: Actiniopteris, Anogramma, Austrogramme, Cerosora, Cosentinia, Eriosorus, Jamesonia, Nephopteris, Onychium, Pityrogramma, Pteris, Pterozonium, Syngramma, Taenitis, and Tryonia; and (6) Fifteen well-supported clades within Pteris are identified, which differ from one another on molecular, morphological, and geographical grounds, and represent 15 major evolutionary lineages.

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1 - Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan, China
2 - University Of British Columbia, Department Of Biology, #4200-6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada
3 - National Museum of Nature and Science, Department of Botany, Tsukuba-shi, Japan
4 - Smithsonian Institution, Department of Botany (MRC 166), National Museum of Natural History, PO Box 37012, Washington, DC, 20013-7012, USA
5 - National Museum of Kenya, 5Department of Botany, Nairobi, Kenya
6 - Chongqing Normal University, 6Department of Biology, Chongqing, China
7 - Instituto de Botânica, Herbário SP, São Paulo, Brazil
8 - James Cook University, Australian Tropical Herbarium, Queensland , Australia
9 - Missouri Botanical Garden, PO Box 299, St. Louis, MO, 63166-0299, USA
10 - Missouri Botanical Garden, Science & Conservation, P.O. Box 299, St. Louis, MO, 63166, United States

long-branch attraction

Presentation Type: Oral Paper:Papers for Sections
Session: 12
Location: Pines North/Boise Centre
Date: Monday, July 28th, 2014
Time: 2:30 PM
Number: 12005
Abstract ID:541
Candidate for Awards:Edgar T. Wherry award

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