Abstract Detail

Systematics

Jesus-Costa, Cristielle [1], Viana, Pedro [2], Lobato Afonso, Edgar A. [3], Oliveira, Luiz [4], Clark, Lynn [5], Santos-Goncalves, Ana Paula [6].

Phylogeny of the Arthrostylidiinae: the Aulonemia clade (Poaceae: Bambusoideae: Bambuseae).

Arthrostylidiinae is a Neotropical woody bamboo subtribe comprising 15 genera and about 190 described species. Monophyly of the Arthrostylidiinae is strongly supported by both molecular and morphological data, including the presence of intercostal sclerenchyma in the mesophyll and a green (waxless) marginal stripe on the abaxial surface of the foliage leaf blades. Its position as sister to the Guaduinae, another lineage of Neotropical woody bamboos, is strongly supported by molecular data and the presence of refractive papillae in both subtribes. We analyzed 73 taxa (63 representing all 15 genera of Arthrostylidiinae, seven representing the five genera of Guaduinae, two representing the Chusqueinae, and an outgroup taxon) using sequence data from both coding (ndhF, 3’ half) and non-coding (trnD-trnT, trnC-rpoB, rps16-trnQ, trnT-trnL, rps16, rpl16) plastid DNA regions. The four major clades recovered in previous analyses were confirmed but we also recovered a fifth major lineage (the Myriocladus clade), with the Glaziophyton clade remaining as sister to the rest of the subtribe. The Aulonemia and Merostachys clades were supported as sister, and this clade formed a trichotomy with the Arthrostylidium and Myriocladus clades. Additional results include reconfirmation of the polyphyly of Aulonemia and confirmation of the polyphyly of Atractantha based on additional sampling; recovery of a complex relationship between Colanthelia and core Aulonemia; and support for the position of the previously unsampled genus Athroostachys sister to Merostachys. Atractantha shepherdiana was strongly supported as sister to Athroostachys capitata and morphological evidence also supported the proposed transfer of A. shepherdiana to Athroostachys. One species of Aulonemia fell within the Glaziophyton clade and three others within the Myriocladus clade; two new genera and one taxonomic transfer are being proposed to accommodate these anomalous species. Members of the Glaziophyton clade share more or less erect and tessellate foliage leaf blades, whereas the rest of the subtribe shares non-tessellate and strongly reflexed foliage leaf blades (with a reversion to erect blades in the cerrado genus Filgueirasia). Aspects of morphological evolution continue to be re-evaluated in light of the molecular phylogenetic results.

1 - Universidade Federal de Vicosa, Programa de Pós-Graduação em Botânica, CCB2, 3º andar, Avenida P.H. Rolfs s/n, Campus Universitário, Vicosa, MG, CEP 36570-900, Brazil
2 - Museu Paraense Emílio Goeldi, Herbario, Avenida Magalhães Barata 376, São Braz, Belem, PA, CEP 66040-170, Brazil
3 - Museu Paraense Emílio Goeldi, Avenida Magalhães Barata 376, São Braz, Belem, PA, CEP 66040-170, Brazil
4 - Biochemistry And Molecular Biology, Caixa Postal, 247 Campus UFV, Vicosa (MG), MG, 36570-000, Brazil
5 - Iowa State University, Department Of Ecology, Evolution, And Organismal Biology, 251 Bessey Hall, 2200 Osborn Dr., Ames, IA, 50011, United States
6 - Universidade Federal de Viçosa, Departamento de Biologia Vegetal, CCB2, 3º andar, Avenida P.H. Rolfs s/n, Viçosa, MG, Brazil, MG, CEP 36570-900, Brazil

Keywords:
Neotropical woody bamboo
plastid DNA
morphological evolution.

Presentation Type: Oral Paper
Session: 3, Systematics I--Tracheophytes, Pteridophytes to Monocots 1
Location: 110/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 9:30 AM
Number: 3007
Abstract ID:670
Candidate for Awards:None