Isozyme polymorphism in natural populations of Avena canariensis from the Canary Islands

Morikawa, Tomomi; Leggett, J. M.

doi:10.1038/hdy.1990.51

Cited by 17 publications

(11 citation statements)

References 27 publications

(17 reference statements)

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“…The degree of outcrossing of A. agadiriana populations after Marshall and Broue (1973) was 1.1%, Morikawa and Leggett (1990), A. fatua (0.06) and A. barbata (0.03) reported by Marshall and Allard (1970). The correlations between low levels of heterozygosity and low outcrossing rates in A. barbata of Israel, and high level of heterozygosity and high out-crossing rates in California were reported (Marshall and Allard 1970;Allard et al 1972;Hamrick and Allard 1972).…”

Section: Discussionmentioning

confidence: 60%

“…This method made it possible to detect the much wider range of variations than the method of taking many seeds from a few plants in a narrow area. Similarly, the range of variation in electrophoretic traits of A. canariensis was greater than the variation found in other species of oats, although the populations derived from a relatively small area (Morikawa and Leggett 1990). The primary gene center of the genus Avena is expected to have more species and variations than the secondary or tertiary gene centers.…”

Section: Discussionmentioning

confidence: 95%

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Isozyme Polymorphism and Genetic Differentiation in Natural Populations of a New Tetraploid Species Avena agadiriana, from Morocco

Morikawa

Leggett

2005

Genet Resour Crop Evol

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A new wild tetraploid oat Avena agadiriana Baum et Fedak was collected from the five populations along the Atlantic coast in Morocco. Variations in six enzyme systems were surveyed and allele frequency, percentage of polymorphic loci, number of alleles per locus, observed and expected heterozygosities, and unbiased genetic distance were calculated. Phenotypic frequencies were scored representing 11 polymorphic loci. The mean percentage of polymorphic loci was 46.25, the mean number of alleles per locus was 1.502, and the mean expected heterozygosity was 0.1526. Two heterozygotes resulting from outcrosses were found in the progeny from M60 and M71. The population of M71 had peculiar alleles Est-4A not present in the other populations. Most of the genetic diversity of this species was between populations with little existing within populations. Geographic and genetic distances between populations were positively correlated with each other and the correlation coefficient was 0.7031. Cluster analysis showed two strongly differentiated groups were apparent, M71 and M74, and the remainder. The former group appears to be adapted to man-made habitat, such as road side or eucalyptus plantation, and the latter to a distinct dry, sandy habitat. To make wide intra-specific variation in this species, the modified mating system would be indispensable.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 95%

Isozyme Polymorphism and Genetic Differentiation in Natural Populations of a New Tetraploid Species Avena agadiriana, from Morocco

Morikawa

Leggett

2005

Genet Resour Crop Evol

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“…The unbiased heterozygosity expected by the HardyWeinberg's equilibrium in the A. maroccana populations was 0.2462. This value is also intermediate between the mean values for the Avena species A. canariensis (0.2545) and A. agadiriana (0.2403) recalculated by using data of Leggett (1990 and2005), and much higher than A. fatua (0.06) and A. barbata (0.03) reported by Marshall and Allard (1970). The outcrossing rate and heterozygosity of A. maroccana were higher than those of the regional and widespread Avena species.…”

Section: Discussionmentioning

confidence: 38%

“…It is higher than those of the Californian populations of A. barbata Pott. ex Link (0.1-7%, Marshal and Allard 1970), the Canary Island's populations of A. canariensis (0%, Morikawa and Leggett 1990) and the Moroccan populations of A. agadiriana (1.259%, which was recalculated from multiple loci data of Morikawa and Leggett 2005). The unbiased heterozygosity expected by the HardyWeinberg's equilibrium in the A. maroccana populations was 0.2462.…”

Section: Discussionmentioning

confidence: 99%

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Isozyme polymorphism and genetic differentiation in natural populations of an endemic tetraploid species Avena maroccana in Morocco

Morikawa

Leggett²

2008

Genet Resour Crop Evol

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Morikawa, T., Leggett, J. M. (2008). Isozyme polymorphism and genetic differentiation in natural populations of an endemic tetraploid species Avena maroccana in Morocco. ?Genetic Resources and Crop Evolution, 55, (8), 1313-1321. IMPF: 00.97 RONO: 1700 3118A wild tetraploid oat Avena maroccana Gdgr. was collected from the 11 populations in the periphery of Rommani and Casablanca geographic groups of Morocco. Genetic diversity of the species was investigated using six allozyme systems. Allelic frequencies were scored representing eight polymorphic and five monomorphic loci. Coefficient of gene differentiation (Gst) was 0.3019, which indicated great genetic differentiation. The number of alleles per locus was 2.6154, the percentage of polymorphic loci was 61.54, and the expected heterozygosity was 0.2462 in all populations. Genetic diversity in A. maroccana was high in comparison to self-pollinated species. In total, nine heterozygotes resulting from outcrossing were found in the progeny from M1, M3, M4, M22 and M26. The population of M7 had peculiar alleles Pgd?2SS and Pgd-1SS in high frequency. M9 had the lowest level of diversity out of the 11 populations. Geographic and genetic distances between all the populations were not significantly correlated with each other (r = 0.0996). Cluster analysis showed that two groups, (M1, M22, M2 and M4) and (M3, M23, M8, M5 and M26) were apparently differentiated. Two populations of the Casablanca group, M7 and M9 were independent from each other, and were separated distinctly from the other populations. Genetic diversity of the Rommani and Casablanca groups was almost the same in all the parameters. This was due to the similar man-made habitat such as roadside or rich fertile soil and brown clay soils. The population size of A. maroccana was small and restricted to the narrow central Morocco with great genetic differentiation so that genetic diversity may be reflected from the results of genetic drift and outcrossing heterozygote segregation.Peer reviewe

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Avena

Лоскутов

Rines²

2011

Wild Crop Relatives: Genomic and Breeding Resources

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Isozyme polymorphism in natural populations of Avena canariensis from the Canary Islands

Cited by 17 publications

References 27 publications

Isozyme Polymorphism and Genetic Differentiation in Natural Populations of a New Tetraploid Species Avena agadiriana, from Morocco

Isozyme Polymorphism and Genetic Differentiation in Natural Populations of a New Tetraploid Species Avena agadiriana, from Morocco

Isozyme polymorphism and genetic differentiation in natural populations of an endemic tetraploid species Avena maroccana in Morocco

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