Genetic Diversity, Mating System and Systematic Relationships in Two Red Mahoganies, Eucalyptus pellita and E. scias

1996 ◽  
Vol 44 (2) ◽  
pp. 157 ◽  
Author(s):  
APN House ◽  
JC Bell
Keyword(s):  
Genetic Diversity ◽  
Genetic Differentiation ◽  
Mating System ◽  
Papua New Guinea ◽  
Isozyme Variation ◽  
Irian Jaya ◽  
Eucalyptus Pellita ◽  
Allelic Differences ◽  
Cape York ◽  
Systematic Relationships

Isozyme variation in two closely related red mahoganies (Eucalyptus pellita F. Muell. and E. scias L.A.S.Johnson and K.D.Hill) was examined in 17 populations of E. pellita from Australia, Papua New Guinea and Indonesia and 8 of E. scias (including all 3 subspecies) from south-eastern coastal Australia. Measures of genetic diversity and relationships between species and subspecies were based on 15 variable loci. Both E. pellita and E. scias had moderately high levels of genetic diversity, comparable to other similarly distributed species. Most genetic diversity within each species was found within populations (80% in E. pellita and 83% in E. scias). There were substantial allelic differences between the species at several loci; the populations clustered into groups corresponding to the two species. Yet genetic differentiation between the two species was relatively low, and the three subspecies of E. scias were not well separated. Outcrossing rates in E. pellita are variable, with low rates (<50%) measured in populations from Irian Jaya and Cape York Peninsula, and 73% in a population from northeast Queensland.

scholarly journals Pollen dispersal, pollen immigration, mating and genetic diversity in restoration of the southern plains Banksia

2020 ◽  
Vol 129 (4) ◽  
pp. 773-792
Author(s):  
Melissa A Millar ◽  
David J Coates ◽  
Margaret Byrne ◽  
Siegfried L Krauss ◽  
Matthew R Williams ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Differentiation ◽  
Mating System ◽  
Mating Systems ◽  
Pollen Dispersal ◽  
Floral Display ◽  
Molecular Tools ◽  
Plant Populations ◽  
Southern Plains ◽  
Population Fitness

Abstract Evaluation of patterns of pollen dispersal, mating systems, population fitness, genetic diversity and differentiation in restoration and remnant plant populations can be useful in determining how well restoration activities have achieved their objectives. We used molecular tools to assess how well restoration objectives have been met for populations of Banksia media in the biodiversity hotspot of south-west Western Australia. We characterized patterns of pollen dispersal within, and pollen immigration into, two restoration populations. We compared mating system parameters, population fitness via seed weight, genetic diversity and genetic differentiation for restoration and associated reference remnant populations. Different patterns of pollen dispersal were revealed for two restoration sites that differed in floral display, spatial aggregation of founders and co-planted species. Proximity to remnant native vegetation was associated with enhanced immigration and more short-range pollen dispersal when other population variables were constant. Greater seed weights at remnant compared to restoration populations were not related to outcrossing rate. Equivalent mating system and genetic diversity parameters and low to moderate levels of genetic differentiation between restoration and remnant populations suggest pollinator services have been restored in genetically diverse restoration populations of local provenance B. media as early as four years from planting.

Patterns of Variation in the Seedling Leaf Oils of Eucalyptus urophylla, E. pellita and E. scias

1995 ◽  
Vol 43 (3) ◽  
pp. 327 ◽  
Author(s):  
JC Doran ◽  
ER Williams ◽  
JJ Brophy
Keyword(s):  
Papua New Guinea ◽  
Compositional Data ◽  
Natural Populations ◽  
Principal Component ◽  
New Guinea ◽  
High Elevation ◽  
New Taxon ◽  
Irian Jaya ◽  
Main Cluster ◽  
Cape York

The volatile leaf oils of glasshouse-grown plants representing natural populations of E. urophylla S.T.Blake, E. pellita F.Muell. and E. scias L.Johnson from the Lesser Sunda Islands, Australia, Papua New Guinea and Irian Jaya were examined for patterns of variation and relationships. The steam distilled oils of the three species were found to be largely monoterpenoid in character and similar qualitatively but variable quantitatively. The relative proportions of α-terpinyl acetate, 1,8-cineole, β-pinene, caryophyllene, α-phellandrene and p-cymene provided good discrimination between species and provenances. The mix of compounds and relatively low yields were such that the oils have no commercial potential. Principal component analysis of oil compositional data revealed groupings of populations consistent with contemporary thinking on the systematics of this complex. The four populations of E. urophylla from Wetar Island included in this study emerged as a group distinct from the main cluster of populations of that species. There was some support in the data for the distinction of high-elevation populations of E. urophylla from eastern Timor from other populations of the species and for the separation of E. scias from E. pellita, although the data, based on limited sampling, was inconclusive. Patterns in the oils of Cape York, Papua New Guinea and Irian Jaya provenances of E.pellita were variable. Evidence from other characters (e.g. adult morphology) will be needed to support the hypothesis that the Cape York and New Guinea populations of E. pellita constitute a new taxon.

scholarly journals Assessing the genetic structure of Oryza glumaepatula populations with isozyme markers

2008 ◽  
Vol 51 (5) ◽  
pp. 873-882 ◽  
Author(s):  
Elizabeth Ann Veasey ◽  
Daruska Cardin ◽  
Rainério Meireles Silva ◽  
Eduardo de Andrade Bressan ◽  
Roland Vencovsky
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Genetic Differentiation ◽  
Mating System ◽  
Outcrossing Rate ◽  
Structure Parameters ◽  
Mato Grosso ◽  
Isozyme Markers ◽  
Self Fertilization ◽  
Oryza Glumaepatula

To assess the genetic diversity and genetic structure parameters, nine populations of Oryza glumaepatula from the Amazon biome, four from the Pantanal biome, and one collected at Rio Xingu, Mato Grosso, totaling 14 populations and 333 individuals were studied with isozyme markers. Six loci were evaluated showing a moderate allozyme variability (A = 1.21, P = 20.7%, Ho = 0.005, He = 0.060). The populations from the Pantanal biome showed higher diversity levels than the Amazon biome. High genetic differentiation among the populations, expected for self-fertilizing species, was observed (F ST=0.763), with lower differentiation found among the Pantanal populations (F ST=0.501). The average apparent outcrossing rate was higher for the Pantanal populations (t a = 0.092) than for the Amazonian populations (t a = 0.003), while the average for the 14 populations was 0.047, in accordance with a self-fertilization mating system.

What for the future of the Jardine River Painted Turtle?

2009 ◽  
Vol 15 (2) ◽  
pp. 92 ◽  
Author(s):  
Jason Schaffer ◽  
Robert G. Doupé ◽  
Ivan R. Lawler
Keyword(s):  
Sea Level ◽  
Papua New Guinea ◽  
Species Complex ◽  
Painted Turtle ◽  
Sea Level Changes ◽  
Irian Jaya ◽  
Disjunct Populations ◽  
Northern Cape ◽  
Cape York ◽  
Coastal River

The Painted Turtle Emydura subglobosa is widely distributed in southern Papua New Guinea and Irian Jaya, where it inhabits the permanent freshwater swamps of adjacent coastal river systems (Lovich et al. 1983; Georges et al. 2006). Emydura subglobosa has also been recorded on mainland Australia, but only from the Jardine River in far northern Cape York Peninsula where it is colloquially named the Jardine River Painted Turtle (Cann 1998). The separation of these two disjunct populations is presumed to be due to Pleistocene sea level changes about 12,000?18,000 years BP (Georges and Thomson 2006). The taxonomic affinities of this species complex remain unresolved (Georges and Adams 1996).

Genetic Diversity, Mating System, and Reproductive Output of Restored Melaleuca acuminata Populations are Comparable to Natural Remnant Populations

2019 ◽  
Vol 37 (4) ◽  
pp. 222-232 ◽  
Author(s):  
Melissa A Millar ◽  
Janet M Anthony ◽  
David J Coates ◽  
Margaret Byrne ◽  
Siegfried L Krauss ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mating System ◽  
Reproductive Output

Genetic diversity and the mating system in a fragmented population of Tsoongiodendron odorum

2013 ◽  
Vol 20 (6) ◽  
pp. 676-684 ◽  
Author(s):  
Wang Xia ◽  
Wang Jing ◽  
Jiang Jinghu ◽  
Kang Ming
Keyword(s):  
Genetic Diversity ◽  
Mating System ◽  
Fragmented Population

scholarly journals Genetic Diversities and Historical Dynamics of Native Ethiopian Horse Populations (Equus caballus) Inferred from Mitochondrial DNA Polymorphisms

Genes ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 155
Author(s):  
Kefena Effa ◽  
Sonia Rosenbom ◽  
Jianlin Han ◽  
Tadelle Dessie ◽  
Albano Beja-Pereira
Keyword(s):  
Genetic Diversity ◽  
Mitochondrial Dna ◽  
Genetic Differentiation ◽  
Sequence Divergence ◽  
Dna Polymorphisms ◽  
Base Pairs ◽  
Feral Horses ◽  
Domestic Horses ◽  
D Loop ◽  
Diversity Estimates

Matrilineal genetic diversity and relationship were investigated among eight morphologically identified native Ethiopian horse populations using polymorphisms in 46 mtDNA D-loop sequences (454 base pairs). The horse populations identified were Abyssinian, Bale, Borana, Horro, Kafa, Kundido feral horses, Ogaden and Selale. Mitochondrial DNA D-loop sequences were characterized by 15 variable sites that defined five different haplotypes. All genetic diversity estimates, including Reynolds’ linearized genetic distance, genetic differentiation (FST) and nucleotide sequence divergence (DA), revealed a low genetic differentiation in native Ethiopian horse populations. However, Kundido feral and Borana domestic horses were slightly diverged from the rest of the Ethiopian horse populations. We also tried to shed some light on the matrilineal genetic root of native Ethiopian horses from a network constructed by combining newly generated haplotypes and reference haplotypes deposited in the GenBank for Eurasian type Turkish Anatolian horses that were used as a genetic conduit between Eurasian and African horse populations. Ninety-two haplotypes were generated from the combined Ethio-Eurasian mtDNA D-loop sequences. A network reconstructed from the combined haplotypes using Median-Joining algorithm showed that haplotypes generated from native Ethiopian horses formed separate clusters. The present result encourages further investigation of the genetic origin of native African horses by retrieving additional mtDNA sequences deposited in the GenBank for African and Eurasian type horses.

scholarly journals Evolutionary history and genetic connectivity across highly fragmented populations of an endangered daisy

Heredity ◽  
2021 ◽  
Author(s):  
Yael S. Rodger ◽  
Alexandra Pavlova ◽  
Steve Sinclair ◽  
Melinda Pickup ◽  
Paul Sunnucks
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Genetic Differentiation ◽  
Evolutionary History ◽  
Livestock Grazing ◽  
Genetic Connectivity ◽  
Evolutionary Divergence ◽  
Common Component ◽  
A Genome ◽  
Eastern Australia

AbstractConservation management can be aided by knowledge of genetic diversity and evolutionary history, so that ecological and evolutionary processes can be preserved. The Button Wrinklewort daisy (Rutidosis leptorrhynchoides) was a common component of grassy ecosystems in south-eastern Australia. It is now endangered due to extensive habitat loss and the impacts of livestock grazing, and is currently restricted to a few small populations in two regions >500 km apart, one in Victoria, the other in the Australian Capital Territory and nearby New South Wales (ACT/NSW). Using a genome-wide SNP dataset, we assessed patterns of genetic structure and genetic differentiation of 12 natural diploid populations. We estimated intrapopulation genetic diversity to scope sources for genetic management. Bayesian clustering and principal coordinate analyses showed strong population genetic differentiation between the two regions, and substantial substructure within ACT/NSW. A coalescent tree-building approach implemented in SNAPP indicated evolutionary divergence between the two distant regions. Among the populations screened, the last two known remaining Victorian populations had the highest genetic diversity, despite having among the lowest recent census sizes. A maximum likelihood population tree method implemented in TreeMix suggested little or no recent gene flow except potentially between very close neighbours. Populations that were more genetically distinctive had lower genetic diversity, suggesting that drift in isolation is likely driving population differentiation though loss of diversity, hence re-establishing gene flow among them is desirable. These results provide background knowledge for evidence-based conservation and support genetic rescue within and between regions to elevate genetic diversity and alleviate inbreeding.

Sign in / Sign up

Export Citation Format

Share Document