scholarly journals Low genetic variation in the salmon and trout parasite Loma salmonae (Microsporidia) supports marine transmission and clarifies species boundaries

2010 ◽  
Vol 91 (1) ◽  
pp. 35-46 ◽  
Author(s):  
AMV Brown ◽  
ML Kent ◽  
ML Adamson
Keyword(s):  
Genetic Variation ◽  
Species Boundaries ◽  
Loma Salmonae

An Application of Molecular Tools in Plant Genetic Diversity Conservation

2014 ◽  
Vol 955-959 ◽  
pp. 830-833
Author(s):  
Zhou Xuan ◽  
Zheng Hong Li ◽  
Cheng Zhang ◽  
Hong Dao Zhang ◽  
Ji Lin Li ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Sustainable Development ◽  
Genetic Variation ◽  
Molecular Markers ◽  
Poverty Alleviation ◽  
Molecular Basis ◽  
Species Boundaries ◽  
Molecular Tools ◽  
New Techniques ◽  
Forestry Production

The conservation and use of plant genetic diversity are essential to the continued maintenance and improvement of agricultural and forestry production and thus, to sustainable development and poverty alleviation. The dramatic advances in molecular genetics over the last decade years have provided workers involved in the conservation of plant genetic diversity with a range of new techniques. Molecular tools, such as molecular markers and other genomic applications, have been highly successful in characterizing existing genetic variation within species, which generates new genetic diversity that often extends beyond species boundaries. The objectives of this article are to review the molecular basis on plant genetic diversity conservation and summarize the continuously rising and application of molecular tool. Then, we look forward and consider the significant of application of molecular tools in plant genetic diversity conservation.

scholarly journals Adaptive introgression: a plant perspective

2018 ◽  
Vol 14 (3) ◽  
pp. 20170688 ◽  
Author(s):  
Adriana Suarez-Gonzalez ◽  
Christian Lexer ◽  
Quentin C. B. Cronk
Keyword(s):  
Genetic Variation ◽  
Species Boundaries ◽  
Adaptive Introgression ◽  
Fitness Effects ◽  
Conservation Implications ◽  
Standing Variation ◽  
The Face ◽  
Signatures Of Selection ◽  
Lines Of Evidence ◽  
Conservation And Management

Introgression is emerging as an important source of novel genetic variation, alongside standing variation and mutation. It is adaptive when such introgressed alleles are maintained by natural selection. Recently, there has been an explosion in the number of studies on adaptive introgression. In this review, we take a plant perspective centred on four lines of evidence: (i) introgression, (ii) selection, (iii) phenotype and (iv) fitness. While advances in genomics have contributed to our understanding of introgression and porous species boundaries (task 1), and the detection of signatures of selection in introgression (task 2), the investigation of adaptive introgression critically requires links to phenotypic variation and fitness (tasks 3 and 4). We also discuss the conservation implications of adaptive introgression in the face of climate change. Adaptive introgression is particularly important in rapidly changing environments, when standing genetic variation and mutation alone may only offer limited potential for adaptation. We conclude that clarifying the magnitude and fitness effects of introgression with improved statistical techniques, coupled with phenotypic evidence, has great potential for conservation and management efforts.

An Electrophoretic Investigation of Relationships of Diploid and Tetraploid Species of Australian Desert Frogs Neobatrachus (Anura: Myobatrachidae)

1996 ◽  
Vol 44 (6) ◽  
pp. 639 ◽  
Author(s):  
MJ Mahony ◽  
SC Donnellan ◽  
JD Roberts
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Diploid Species ◽  
Genetic Data ◽  
Species Boundaries ◽  
Tetraploid Species ◽  
Allozyme Electrophoresis ◽  
Diploid Population ◽  
Introgressive Hybridisation ◽  
Well Differentiated

Allozyme electrophoresis of 27 loci was used to characterise genetic variation among 29 populations of six diploid species of the myobatrachid frog genus Neobatrachus. All six species are well differentiated genetically with the percentage of fixed differences between species ranging from 11 to 59%. The genetic data are in agreement with the currently accepted species boundaries. The four tetraploid species were examined for 25 of the 27 loci assayed in the diploid species. In contrast to the diploid species, the tetraploid species shared electromorphs with each other at all the loci examined. The tetraploid species were examined for the presence of electromorphs specific to individual diploid species. The majority of these electromorphs were observed in the tetraploid species. For cases in which the range of a tetraploid species contacts that of a diploid species and the diploid population can be characterised by unique electromorphs, then evidence of current gene flow was found in the direction of the tetraploid populations. The data are compatible with single or multiple discrete or hybrid origins of the tetraploids overlain by gene flow among the tetraploids and between the tetraploids and some and perhaps all of the diploids by means of geographically limited but ongoing episodes of introgressive hybridisation.

Phylogeography, geographic structure, genetic variation, and potential species boundaries in Philippine slender toads

2011 ◽  
Vol 61 (2) ◽  
pp. 333-350 ◽  
Author(s):  
Marites Bonachita Sanguila ◽  
Cameron D. Siler ◽  
Arvin C. Diesmos ◽  
Olga Nuñeza ◽  
Rafe M. Brown
Keyword(s):  
Genetic Variation ◽  
Species Boundaries ◽  
Geographic Structure

Genetic Variation and Species Boundaries in Calopogon (Orchidaceae)

2004 ◽  
Vol 29 (2) ◽  
pp. 308-315 ◽  
Author(s):  
Dorset W. Trapnell ◽  
J.L. Hamrick ◽  
David E. Giannasi
Keyword(s):  
Genetic Variation ◽  
Species Boundaries
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