Differential levels of genetic diversity and divergence among populations of an ancient Australian rainforest conifer, Araucaria cunninghamii

@article{Pye2008DifferentialLO,
  title={Differential levels of genetic diversity and divergence among populations of an ancient Australian rainforest conifer, Araucaria cunninghamii},
  author={Matthew G. Pye and Murray J. Henwood and Paul A. Gadek},
  journal={Plant Systematics and Evolution},
  year={2008},
  volume={277},
  pages={173-185}
}
Historical fragmentation and subsequent isolation has affected the levels of genetic diversity in many lineages of ancient plant taxa. This study investigated the effects of historical processes on Araucaria cunninghamii (Hoop Pine), Araucariaceae, using both RAPD and ISSR markers. While most populations maintain moderate levels of diversity, there is some evidence for reduced genetic variation. Most sampled populations are significantly differentiated from each other, thereby emphasizing the… 

Genetic variability of Araucaria angustifolia in the Argentinean Parana Forest and implications for management and conservation

TLDR
Genetic variability of Araucaria angustifolia populations in Argentina was moderate-to-low and reduced by logging, and the moderate genetic differentiation among populations suggests an increase in the genetic structure of remnant populations because of fragmentation.

Evolutionary dynamics of emblematic Araucaria species (Araucariaceae) in New Caledonia: nuclear and chloroplast markers suggest recent diversification, introgression, and a tight link between genetics and geography within species

TLDR
Five closely related Araucaria species were investigated to investigate among-species relationships and the distribution of within-species genetic diversity across New Caledonia, suggesting that species diverged recently, have large effective sizes and/or that cpDNA experienced slow rates of molecular evolution.

Consequences of long- and short-term fragmentation on the genetic diversity and differentiation of a late successional rainforest conifer

TLDR
Investigation of the genetic diversity and structure of Podocarpus elatus (Podocarpaceae), a long-lived rainforest conifer endemic to Australia found that the species survived historic population contraction in dispersed refugia within each of these genetically differentiated regions.

Neutral Genetic Variation

TLDR
The neutral theory of molecular evolution was formalized in the late 1960s, in part due to recognition of developing technologies that provided scientists with the ability to observe variation at the level of individual genes.

The Conifers: Genomes, Variation and Evolution

References

SHOWING 1-10 OF 31 REFERENCES

Genetic diversity, differentiation and conservation in Araucaria bidwillii(Araucariaceae), Australia's Bunya pine

TLDR
This study investigated the effects of historical fragmentation on the genetic diversity and differentiation of Australia's Bunya Pine using random amplified DNA (RAPD) markers, finding high diversity characterises all Bunya populations sampled, regardless of population size or degree of isolation.

Genetic variation in the vulnerable and endemic Monkey Puzzle tree, detected using RAPDs

TLDR
Within Andean groups there was evidence of a trend of genetic distance with increasing latitude, and clustering of populations across the Andes, suggesting postglacial migration routes from multiple refugia.

Comparison of different nuclear DNA markers for estimating intraspecific genetic diversity in plants

  • H. Nybom
  • Environmental Science, Biology
    Molecular ecology
  • 2004
TLDR
Comparisons between the different methods, when applied to the same plant material, indicate large similarities between the dominant markers and somewhat lower similarity with the STMS‐based data, presumably due to insufficient number of analysed microsatellite DNA loci in many studies.

Molecular Variation in Isolated Plant Populations

TLDR
In studies of native plant species whose populations have long endured isolation, population numbers very often appear stable and populations often contain ample genetic variation and the role of somatic processes in the generation of genetic variation may assume an increased importance.

Genetic variation in Fitzroya cupressoides (alerce), a threatened South American conifer

TLDR
Assessment of genetic variation using DNA markers within and between populations of Fitzroya cupressoides indicated that there is a significant degree of variation within each population, and did not provide evidence for genetic ‘bottleneck’ effects within the species.

The Southern Conifer Family Araucariaceae: History, Status, and Value for Paleoenvironmental Reconstruction

TLDR
Recent information on ecology and phylogeny and on pollen and macrofossil assemblages is examined to assess the history and present-day status of the Araucariaceae and its potential for refinement of past environmental, particularly climatic, conditions.

Effects of life history traits and sampling strategies on genetic diversity estimates obtained with RAPD markers in plants

TLDR
The results suggest that RAPD can be a sensitive method for detection of genetic structuring according to the isolation-by-distance model, but also means that sampling strategies, as applied in individual studies, can seriously influence the resulting estimates of between-population diversity.

Comparative genetic study confirms exceptionally low genetic variation in the ancient and endangered relictual conifer, Wollemia nobilis (Araucariaceae)

TLDR
It is concluded that genetic diversity is exceptionally low in the Wollemi pine, the most extreme case known in plants, and the combination of small population effects, clonality and below‐average genetic variation in the family are probable contributing factors.

Pollen dispersal and gene flow by pollen in Araucaria angustifolia

TLDR
The physical characteristics of the pollen suggest that pollen dispersion is likely to be limited, and the homogeneity of pollen clouds of A. angustifolia was assessed for 70 trees of natural population in Brazil.