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Systematics Section / ASPT

Jaén-Molina, Ruth [1], Caujape-Castells, Juli [1], Fernández-Palacios, Olga [2], Pérez de Paz, Julia [3], Febles, Rosa [3], Bramwell, David [1], Reyes-Betancort, Alfredo [4], Akhani, Hossein [5], Abdel Khalik, Kadry [6].

Toward a molecular phylogeny of the Canarian Matthioleae (Brassicaceae): first insights based on sequence data for ITS1 and ITS2.

A previous study of the Matthioleae Schulz (Brassicaceae) by our group using sequences of the regions trn (cpDNA) and ITS1 afforded baseline insights on the phylogeography of this tribe and highlighted the need of adding more taxa and molecular markers to propose more consistent hypotheses. In this contribution, we add a new marker region (ITS2) to an enhanced taxonomic and geographic sampling consisting of 73 populations (17 of the seven species of the Canarian endemic genus Parolinia Webb, 50 of 18 different Matthiola R. Br species and 6 outgroups encompassing samples of different related species). Parsimony analyses on the 256 total informative characters generated 110.274 maximum parsimony trees of 1.286 steps that clearly separated Matthiola and Parolinia into two clades and suggested that (1) Parolinia is monophyletic and tightly related to the Eastern African genus Diceratella (in agreement with morphological studies to date) and to an undescribed taxon from Iran; (2) Parolinia ornata and P. filifolia group in a well-supported sub-clade, thus coinciding with previous inferences based on morphology and reproductive biology; (3) the taxa of Matthiola distribute into two sister gropus consisting of (A) the Iranian taxa and (B) the Mediterranean and Canarian ones; (4) within clade B, the Eastern African taxa appear in a consistent basal position, indicating a probable origin of the clade in this geographical region; and (5) although the Canarian endemic Matthiola bolleana appears in a clearly derived position, the topology of clade A hints (though not compellingly) that there might have been recolonisations from the Canaries to the mainland. This investigation is supported by the Spanish Ministerio de Ciencia y Tecnología through the project “Origen de las Matthioleae Macaronésicas: Implicaciones biogeográficas y para la conservación” (REN2003 07592-GLO).


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1 - Jardín Botánico Canario \"Viera y Clavijo\", Molecular Biodiversity Labs and DNA Bank, Ap. de correos 14 de Tafira Alta., Las Palmas de Gran Canaria, 35017, Spain
2 - Jardin Botanico Canario, Sección de Investigación, Apartado De Correos 14,, Las Palmas De Gran Canaria, E-35017, Spain
3 - Jardin Canario \"Viera y Clavijo\", Sección de Investigación, Apto. de correos 14, Las Palmas De Gran Canaria, E-35017, Spain
4 - Jardín de Aclimatación de La Orotava, ICIA, C. Retama 2, Puerto de La Cruz (Tenerife), 38400, Spain
5 - University of Tehran, Department of Biology, Faculty of Science, Tehran, P.O.Box 14155-6455, Iran
6 - South Valley University, Botany Department, Faculty of Science, Sohag, , Egypt

Keywords:
Matthioleae
Brassicaceae
ITS
phylogeny
biogeography
Canary Islands
Parolinia
Matthiola.

Presentation Type: Poster:Posters for Sections
Session: 48-185
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:462


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