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

Koehler‐Santos, Patrícia; Lorenz, Aline Pedroso; Salzano, Francisco M.; Freitas, Loreta B.

doi:10.1590/s1519-69842006000500006

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…Similar levels of nucleotide diversity were observed in Solanum pimpinellifolium (p = 0.0064; Caicedo and Schaal 2004), Abies kawakamii (p = 0.00648; Shih et al 2007) and Citrullus colocynthis (p = 0.0049; Dane et al 2007), when they were analyzed using the GapC gene. However, nucleotide diversity was high for the GapC region in Manihot esculenta (p = 0.49; Olsen 2002) and Passiflora alata (p = 0.01051; Koehler-Santos et al 2006).…”

Section: Discussionmentioning

confidence: 97%

Understanding the genetic structure of Symplocos laurina Wall. Populations using nuclear gene markers

et al. 2009

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To characterize the genetic diversity of present populations of Symplocos laurina, which grow in the montane forests in India, we analyzed the DNA sequences of a nuclear gene. Using the 881 bp sequence of cytosolic Glyceraldehyde-3-phosphate dehydrogenase gene, we detected 24 haplotypes among 195 individuals sampled from 14 populations. Two dominant haplotypes were distributed over the entire range of this species in India and several private haplotypes were found. Low genetic diversity within population, high differentiation, number of population specific haplotypes and deviation from neutral evolution characterized the present populations of S. laurina. An analysis of molecular variance indicated the presence of geographic structure within the haplotype distribution. The occurrence of S. laurina preglaciation in India is the most parsimonious explanation for the current geographic structure observed. The populations are presumably ancient and might have spread across its extant distribution range in India through a recent range expansion event.

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Section: Discussionmentioning

confidence: 97%

Understanding the genetic structure of Symplocos laurina Wall. Populations using nuclear gene markers

et al. 2009

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“…(Durka et al 2005), Avena barbata(Latta et al 2007), Centaurea diffusa (A. Blair, personal communication), Cirsium arvense(Slotta et al 2006), Passiflora alata(Koehler-Santos et al 2006), and Phragmites australis (L. Meyerson, personal commuincation).…”

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confidence: 99%

Hybridization and the evolution of invasiveness in plants and other organisms

2008

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Less than a decade ago, we proposed that hybridization could serve as a stimulus for the evolution of invasiveness in plants (Ellstrand and Schierenbeck Proc Nat Acad Sci USA 97:7043-7050, 2000). A substantial amount of research has taken place on that topic since the publication of that paper, stimulating the symposium that makes up this special issue. Here we present an update of this emergent field, based both on the papers in this volume and on the relevant literature. We reevaluate the lists that we presented in our earlier paper of reports in which hybridization has preceded the evolution of invasiveness. We discard a few cases that were found to be in error, published only as abstracts, or based on personal communication. Then we augment the list from examples in this volume and a supplementary literature search. Despite the omissions, the total number of cases has increased. Many have been strengthened. We add a list of cases in which there has been evidence that intra-taxon hybridization has preceded the evolution of invasiveness. We also provide a number of examples from organisms other than plants. We consider how our examples suggest mechanisms whereby hybridization may act to stimulate the evolution of invasiveness. Hybridization does not represent the only evolutionary pathway to invasiveness, but it is one that can explain why the appearance of invasiveness often involves a long lag time and/or multiple introductions of exotics.

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“…The general conclusion that can be inferred from the nuclear molecular variability, as well as by field and historical observations (Koehler‐Santos et al ., 2006), is that P. alata maintained high indices of intrapopulation genetic diversity probably due to the many introductions that should have taken place in southern Brazil over the last 50 years. These events could have occurred due to human influence, which facilitated the transfer of plants from one place to another, as well as by an intense intra‐ and interpopulation gene flow, coupled with adaptive genetic plasticity.…”

Section: Discussionmentioning

confidence: 94%

“…The inference that P. alata is an invasive species in Rio Grande do Sul is derived from different sources, both historical (bibliographic search, herbaria survey) and our field studies, as described in detail elsewhere (Koehler‐Santos et al ., 2006). The genetic data, as discussed below, point in the same direction.…”

Section: Discussionmentioning

confidence: 99%

“…This species was introduced into this region in 1934 (first historical registration), which represents the extreme southern distribution, mainly through human cultivation. However, starting in the 1960s, there were indications that P. alata was invading open territories, leading to its classification as a subspontaneous species (Koehler‐Santos et al ., 2006).…”

Section: Introductionmentioning

confidence: 99%

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Molecular genetic variation in Passiflora alata (Passifloraceae), an invasive species in southern Brazil

Koehler‐Santos

Lorenz

Muschner

et al. 2006

Biological Journal of the Linnean Society

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A total of 85 wild plants were collected in different areas of southern and south‐eastern Brazil, and studied for nrDNA internal transcribed spacers (ITS). Thirty‐two of them were also investigated for two other nuclear (G3pdh and LEAFY), as well as eight plastid systems. Sixty‐one ITS sequence types were identified, in a region of 412 bp, whereas 42 G3pdh haplotypes were found in a region of 1010 bp, and 23 LEAFY haplotypes in a region of 565 bp. GC content was higher in ITS (65%) than in the two other nuclear regions (40–42%), whereas nucleotide diversity was markedly higher in G3pdh than in the other two. No variability was found in the plastid systems. Most of the nuclear molecular diversity (56–86%) occurs at the intrapopulation level, and there is clear evidence of population expansion and little geographical structure. Historical information and field studies indicate that Passiflora alata is actively colonizing previously unoccupied areas in southern Brazil. High indices of intrapopulation variability were found in the region that is being colonized, similar to those found in areas where P. alata is native. Multiple introductions, as well the species’ genetic structure and human interference, may explain these findings. © 2006 The Linnean Society of London, Biological Journal of the Linnean Society, 2006, 88, 611–630.

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

Cited by 7 publications

References 11 publications

Understanding the genetic structure of Symplocos laurina Wall. Populations using nuclear gene markers

Understanding the genetic structure of Symplocos laurina Wall. Populations using nuclear gene markers

Hybridization and the evolution of invasiveness in plants and other organisms

Molecular genetic variation in Passiflora alata (Passifloraceae), an invasive species in southern Brazil

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