Phylogeographic Inferences Concerning Evolution of Brazilian Passiflora actinia and P. elegans (Passifloraceae) Based on ITS (nrDNA) Variation

Abstract

Gene flow between lineages is the possible cause for the presence of different ITS sequences within a given plant, the absence of homogenization being due to the high degree of vegetative reproduction in the two species. Differentiation of P. actinia into geographic groups and the origin of P. elegans may have been influenced by the Atlantic Forest migration towards southern Brazil. The genetic pattern of the interspecific hybrid indicates that plastid inheritance in these species is at least sometimes paternal.

Range-wide patterns of nuclear and chloroplast DNA diversity in Vriesea gigantea (Bromeliaceae), a neotropical forest species

“…The location of the north-south split in V. gigantea (Figure 1) does not coincide precisely with the latitudinal phylogeographic breaks reported by other phylogeographic studies of Atlantic Forest species (Costa, 2003;Lorenz-Lemke et al, 2005;Grazziotin et al, 2006;Cabanne et al, 2007Cabanne et al, , 2008Tchaicka et al, 2007). This may be explained by the simple fact that barriers to dispersal will affect different species of animals and plants in different ways.…”

“…In contrast, phylogeographic studies in southern and southeastern South America are rare and have thus far been limited to neotropical mammals (small mammals: Costa, 2003;Cerdocyon thous: Tchaicka et al, 2007), reptiles (Bothrops jararaca: Grazziotin et al, 2006) and birds (Xiphorhynchus fuscus: Cabanne et al, 2007Cabanne et al, , 2008. Few studies have reported phylogeography patterns in plants of the southern portion of the Brazilian Atlantic Rainforest, for example, those on Passiflora actinia and P. elegans from the Southern Brazilian States of Rio Grande do Sul, Santa Catarina and Paraná (Lorenz-Lemke et al, 2005) and for P. sellowii (Ledru et al, 2007). The phylogeographic patterns reported for these taxa are in agreement with those observed for V. gigantea.…”

“…The phylogeographic patterns reported for these taxa are in agreement with those observed for V. gigantea. For B. jararaca, C. thous and P. elegans, recent Genetic structure in a rainforest bromeliad C Palma-Silva et al demographic expansion was inferred for the southern groups, whereas northern populations seem to have enjoyed past demographic stability (Lorenz-Lemke et al, 2005;Grazziotin et al, 2006;Tchaicka et al, 2007). In our study the significant isolation by distance seen for nuclear microsatellites (Figure 2) and decreasing diversity from the north to south across the species' range (Supplementary Figure 1) are consistent with a biogeographic scenario in which the southern part of the Atlantic Rainforest was formed through migration of northern tropical elements from the Rio de Janeiro region (Rambo, 1951(Rambo, , 1960Smith, 1962).…”

On the taxonomic position of <em>Tanacetum funkii</em> (Anthemideae, Compositae)

“…103-03-93-10 (B 10 0603656)]. However, the observation made in many molecular phylogenetic studies at or below the species level for the nrDNA ITS marker showing intraspecific variation on the one hand (e.g., Lorenz-Lemke & al., 2005) or interspecific identity on the other hand (e.g., Kolarčik & al., 2010) is a justified argument for not basing taxonomic decisions solely on molecular markers and for considering other sources of evidence like morphology, anatomy, cytology, etc.…”

Ecological-evolutionary relationships in Passiflora alata from Rio Grande do Sul, Brazil

“…As part of a long-term project of investigation of the genus Passiflora by our group (Muschner et al, 2003;Lorenz-Lemke et al, 2005) we studied Passiflora alata Curtis in detail in the Brazilian state of Rio Grande do Sul. The geographical proximity to the place where we work provided an opportunity to make detailed field and ecological observations, that can be related to the geneticmolecular studies that we were already making on this and related species.…”