Abstract Detail

Systematics

Meerow, Alan W. [1], Campos-Rocha Neto, Antonio [2], Garcia, Nicolas [3], Reeve, Andrew [4], Dutilh, Julie H. [2].

Towards a molecular phylogeny of the tribe Griffineae (Amaryllidaceae).

The Griffinieae is the only endemic tribe of American Amaryllidaceae found in Brazil. It consists of three genera: Griffinia, with ca. 15 species, and two monotypic genera, Worsleya, and Cearanthes (the latter whose phylogenetic position is determined in this paper). Griffinia is marked by its petiolate to sub-petiolate leaves that are sometimes spotted, non-phytomelanous seeds with elaiosomes, and has been treated as two subgenera, Griffinia and Hyline. Subgenus Griffinia with small to medium-sized purple-blue or white flowers are Atlantic coastal rain forest understory herbs (G. liboniana also occurs in more inland seasonally dry forests). It is distributed from Ceará to northern São Paulo states. The smaller subgenus Hyline are plants of cerrado and caatinga primarily, with ephemeral and fragrant large white flowers. It is found from Piauí to the Rio de Janeiro coast and inland to Pará, Tocantins, Goiás, Minas Gerais, Mato Grosso and possibly Mato Grosso do Sul. In this paper, we present results of the first molecular phylogeny of Griffinia using DNA sequences of the nuclear ribosmal RNA Internal Transcribed Spacer (ITS). The monotypic Cearanthes is shown to be sister to Griffinia. G. parviflora is the first branch in Griffinia, sister to all other species in both subgenera. The next clade represents a distinct G. liboniana group but includes G. rochae, followed by G. aracensis. Neither subgenus resolves as monophyletic. Subgenus Hyline is polyphyletic, with G. gardneriana sister to G. alba. G. nocturna resolves as the sister clade to a large trichotomy consisting of the G. alba/G. gardneriana clade, and two clades of blue flowered Atlantic rain forest species. Tests for reticulation were negative across the alignment. Future plans will incorporate sequences of 10 low copy nuclear genes and plastome data.

1 - USDA-ARS-SHRS, UNITED STATES DEPARTMENT OF AGRICULTURE, 13601 Old Cutler Road, Miami, FL, 33158, USA
2 - Universidade Estadual de Campinas , Instituto de Biologia, Rua Monteiro Lobato - n° 255, Campinas, SP, 13083-970, Brazil
3 - Universidad de Chile, Facultad de Ciencias Forestales y Conservación de la Naturaleza, Av. Santa Rosa 11315, Santiago, Chile
4 - University of Miami, Biology, 1301 Memorial Dr #215,, Coral Gables, FL, 33146, USA

Keywords:
molecular systematics
Griffineae
nrDNA
Brazilian endemics.

Presentation Type: Oral Paper
Session: 14, Systematics I: Basal Dicots, Monocots & Rosids
Location: Sundance 1/Omni Hotel
Date: Monday, June 26th, 2017
Time: 2:00 PM
Number: 14003
Abstract ID:54
Candidate for Awards:None