| Abstract Detail
Biogeography Jones, Katy [1], Furtado Dias, Elisabete [2], Schilling, Edward [3], Kilian, Norbert [1]. The origins of New World lettuce lineages. Flowering plant intercontinental disjunctions have long been believed to result from land connections between Eurasia and North America across Beringia and the North Atlantic. The lettuce alliance (Lactucinae, Cichoreae, Asteraceae) is distributed in Europe, Africa, Asia and North America with two centres of diversity; one in the E Mediterranean-SW Asian region, the other in the Sino-Himalayan region. Our phylogenetic studies are the first to sample the entire alliance and disentangle generic diversity. Using this background we aim to decipher the origins of the North American lettuce (Lactuca) taxa. Chloroplast, ITS and low copy nuclear sequence analyses, combined with biogeographic studies have revealed novel insights into the origin of these taxa. Presenting the results of molecular phylogenetic, biogeographic and molecular dating analyses, we show that the North American taxa are members of two distinct monophyletic Lactuca lineages, representing two independent migration episodes from Eurasia to North America. One of these North American lineages is unique in Lactuca for its chromosome number of n=17, likely being of allopolyploidization origin; all other taxa are diploids with n=8 and n=9. We hypothesise two contrasting geographic routes to explain the origin of the two North American Lactuca lineages.
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1 - Freie Universität and Botanischer Garten und Botanisches Museum, Biological Sciences, Königin Luise Straße 6-8 Dahlem, Berlin, 14195, Germany
2 - Centre of Biodiversity and Genetic Resources (CIBIO), Biology, University of the Azores, R. Mae de Deus 13A, Sao Miguel, Ponta Delgada, 9501-801, Portugal
3 - University Of Tennessee, Department Of Ecology & Evolutionary Biology, 569 Dabney Hall, KNOXVILLE, TN, 37996-1610, USA
Keywords:
Lactuca
Plant disjunctions
Biogeography
Allopolyploidy.
Presentation Type: Oral Paper
Session: 37, Biogeography II
Location: 103/Savannah International Trade and Convention Center
Date: Wednesday, August 3rd, 2016
Time: 8:30 AM
Number: 37003
Abstract ID:61
Candidate for Awards:None |
