Molecular evolution and ecological stress at global, regional and local scales: The Israeli perspective

Nevo, Eviatar

doi:10.1002/(sici)1097-010x(199809/10)282:1/2<95::aid-jez12>3.0.co;2-f

Cited by 80 publications

(19 citation statements)

References 92 publications

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“…Theoretically, spatial and temporal ecological variation is of prime importance in maintaining genetic diversity in natural populations, particularly in dynamically cycling environments (Nevo, 1998). Given the direct relationship between genetic diversity and the evolutionary potential of a taxon, it is important to know how much the documented genetic differences contribute to differences in fitness.…”

Section: Genetic Diversitysupporting

confidence: 54%

Temporal patterns of genetic and phenotypic variation in the epidemiologically important drone fly, Eristalis tenax

Francuski

Matić

Ludoški

et al. 2011

Medical and Veterinary Entomology

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Eristalis tenax L. (Diptera: Syrphidae) is commonly known as the drone fly (adult) or rat-tailed maggot (immature). Both adults and immature stages are identified as potential mechanical vectors of mycobacterial pathogens, and early-stage maggots cause accidental myiasis. We compared four samples from Mount Fruška Gora, Serbia, with the aim of obtaining insights into the temporal variations and sexual dimorphism in the species. This integrative approach was based on allozyme loci, morphometric wing parameters (shape and size) and abdominal colour patterns. Consistent sexual dimorphism was observed, indicating that male specimens had lighter abdomens and smaller and narrower wings than females. The distribution of genetic diversity at polymorphic loci indicated genetic divergence among collection dates. Landmark-based geometric morphometrics revealed, contrary to the lack of divergence in wing size, significant wing shape variation throughout the year. In addition, temporal changes in the frequencies of the abdominal patterns observed are likely to relate to the biology of the species and ecological factors in the locality. Hence, the present study expands our knowledge of the genetic diversity and phenotypic plasticity of E. tenax. The quantification of such variability represents a step towards the evaluation of the adaptive potential of this species of medical and epidemiological importance.

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Section: Genetic Diversitysupporting

confidence: 54%

Temporal patterns of genetic and phenotypic variation in the epidemiologically important drone fly, Eristalis tenax

Francuski

Matić

Ludoški

et al. 2011

Medical and Veterinary Entomology

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“…The robustness of the patterns obtained could be estimated by comparing the results of SSR and AFLP with other similar studies. The accumulated data available from different species and genera support the pattern observed by SSR and AFLP (reviewed by Nevo 1998b).…”

Section: Genetic Diversity Pattern In Wild Barleymentioning

confidence: 68%

AFLP genetic polymorphism in wild barley (Hordeum spontaneum) populations in Israel

et al. 2003

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The genetic diversity produced by the amplified fragment length polymorphism (AFLP) method was studied in 94 genotypes of wild barley, Hordeum spontaneum (C. Koch) Thell., originating from ten ecologically and geographically different locations in Israel. Eight primer pairs produced 204 discernible loci of which 189 (93%) were polymorphic. Each genotype had a unique banding profile and the genetic similarity coefficient varied between 0.74 and 0.98. The phenogram generated from these similarities by the UPGMA method did not group genotypes strictly according to their geographical origin, which pattern was also seen in the principal coordinate (PCO) plot. Genetic diversity was larger within (69%) than among (31%) populations. Associations between ecogeographical variables and the mean gene diversity were found at one primer pair. The results are discussed and compared with data obtained by the simple sequence repeat (SSR) method.

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“…In this center of diversity, wild emmer wheat harbors rich genetic diversity and resources [1]. Previous studies in T. dicoccoides and other cereals have shown significant nonrandom adaptive molecular genetic differentiation at single and multilocus structures in either protein-coding regions or randomly amplified polymorphic DNAs among micro-ecological environments [2,3]. It was also determined that wild emmer wheat is genetically variable and that the genetic differentiation of populations included regional and local patterns with sharp genetic differentiation over short distances [4].…”

Section: Introductionmentioning

confidence: 99%

Molecular evolution of dimeric α-amylase inhibitor genes in wild emmer wheat and its ecological association

et al. 2008

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Backgroundα-Amylase inhibitors are attractive candidates for the control of seed weevils, as these insects are highly dependent on starch as an energy source. In this study, we aimed to reveal the structure and diversity of dimeric α-amylase inhibitor genes in wild emmer wheat from Israel and to elucidate the relationship between the emmer wheat genes and ecological factors using single nucleotide polymorphism (SNP) markers. Another objective of this study was to find out whether there were any correlations between SNPs in functional protein-coding genes and the environment.ResultsThe influence of ecological factors on the genetic structure of dimeric α-amylase inhibitor genes was evaluated by specific SNP markers. A total of 244 dimeric α-amylase inhibitor genes were obtained from 13 accessions in 10 populations. Seventy-five polymorphic positions and 74 haplotypes were defined by sequence analysis. Sixteen out of the 75 SNP markers were designed to detect SNP variations in wild emmer wheat accessions from different populations in Israel. The proportion of polymorphic loci P (5%), the expected heterozygosity He, and Shannon's information index in the 16 populations were 0.887, 0.404, and 0.589, respectively. The populations of wild emmer wheat showed great diversity in gene loci both between and within populations. Based on the SNP marker data, the genetic distance of pair-wise comparisons of the 16 populations displayed a sharp genetic differentiation over long geographic distances. The values of P, He, and Shannon's information index were negatively correlated with three climatic moisture factors, whereas the same values were positively correlated by Spearman rank correlation coefficients' analysis with some of the other ecological factors.ConclusionThe populations of wild emmer wheat showed a wide range of diversity in dimeric α-amylase inhibitors, both between and within populations. We suggested that SNP markers are useful for the estimation of genetic diversity of functional genes in wild emmer wheat. These results show significant correlations between SNPs in the α-amylase inhibitor genes and ecological factors affecting diversity. Ecological factors, singly or in combination, explained a significant proportion of the variations in the SNPs, and the SNPs could be classified into several categories as ecogeographical predictors. It was suggested that the SNPs in the α-amylase inhibitor genes have been subjected to natural selection, and ecological factors had an important evolutionary influence on gene differentiation at specific loci.

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Molecular evolution and ecological stress at global, regional and local scales: The Israeli perspective

Cited by 80 publications

References 92 publications

Temporal patterns of genetic and phenotypic variation in the epidemiologically important drone fly, Eristalis tenax

Temporal patterns of genetic and phenotypic variation in the epidemiologically important drone fly, Eristalis tenax

AFLP genetic polymorphism in wild barley (Hordeum spontaneum) populations in Israel

Molecular evolution of dimeric α-amylase inhibitor genes in wild emmer wheat and its ecological association

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