Pablo Vargas Spanish National Research Council Download full-text PDF Read full-text Download full-text PDF Read full-text Download citation Copy link Link copied Read full-text Download citation Copy link Link copied Citations (97) References (94) Figures (4) Abstract and Figures The genus Olea (Oleaceae) includes approx.Olea, Paniculatae and Tetrapilus, the first of which has two sections (Olea and Ligustroides).
Dune 1984 The Alternative Edition V2 Subtitles Greek Download Citation CopyOlive trees (the O. To clarify the biogeographical history of this group, a molecular analysis of Olea and related genera of Oleaceae is thus necessary. A phylogeny was built of Olea and related genera based on sequences of the nuclear ribosomal internal transcribed spacer-1 and four plastid regions. Lineage divergence and the evolution of abaxial peltate scales, the latter character linked to drought adaptation, were dated using a Bayesian method. Partial incongruence between nuclear and plastid phylogenetic reconstructions suggests a reticulation process in the evolution of subgenus Olea. Estimates of divergence times for major groups of Olea during the Tertiary were obtained. This study indicates the necessity of revising current taxonomic boundaries in Olea. The results also suggest that main lines of evolution were promoted by major Tertiary climatic shifts: (1) the split between subgenera Olea and Paniculatae appears to have taken place at the Miocene-Oligocene boundary; (2) the separation of sections Ligustroides and Olea may have occurred during the Early Miocene following the Mi-1 glaciation; and (3) the diversification within these sections (and the origin of dense abaxial indumentum in section Olea) was concomitant with the aridification of Africa in the Late Miocene. Majority-rule consensus tree of nuclear ribosomal DNA (ITS-1) sequences using Bayesian inference. Numbers in bold below branches indicate maximum-parsimony node support (bootstrap value). Divergent haplotypes found in a single tree (from Tassili nAjjer and Tenerife) are numbered 1 and 2. The tree was rooted using Ligustrum vulgare and Syringa vulgaris. Abbreviations: O. Olea capensis; O. Olea europaea; MD, Madagascar. Divergence time estimates based on both ITS-1 and plastid DNA sequences for major Olea lineages. Horizontal rectangles on nodes represent standard deviations of divergence times. The appearance of scattered peltate scales (solid triangle 1) and indumenta with large lobed peltate scales (solid triangle 2) on the abaxial leaf surface is indicated on the corresponding branches. See Supplementary Data 3 for more details on the phylogenetic tree topology. SEM photographs of the abaxial surface of several members of Olea and related taxa. Stomata protected by dense scales (4) are only observed in samples of subgenus Olea, section Olea, although scattered peltate trichomes (3) are observed in other species of Olea. Specimens of subgenus Tetrapilus and other genera do not have scales, although in some cases they possess glandular structures (2) and, in the case of O. Continued Figures - uploaded by Guillaume Besnard Author content All figure content in this area was uploaded by Guillaume Besnard Content may be subject to copyright. Dune 1984 The Alternative Edition V2 Subtitles Greek For Free Public FullDune 1984 The Alternative Edition V2 Subtitles Greek Free Public FullDiscover the worlds research 20 million members 135 million publications 700k research projects Join for free Public Full-text 1 Content uploaded by Guillaume Besnard Author content All content in this area was uploaded by Guillaume Besnard Content may be subject to copyright.
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