Evolution in closely adjacent plant populations II. Agrostis stolonifera in maritime habitats

Aston, J L; Bradshaw, A. D.

doi:10.1038/hdy.1966.64

Cited by 122 publications

(50 citation statements)

References 14 publications

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“…However, Aston and Bradshaw (1966) and McNeilly and Antonovics (1968) reported substantial gene flow between populations of grasses and yet genetic diversity being maintained over relatively short distances. As indicated by the genotypic differences between adult and seed populations, this must be due to rather strong contrasting selection pressures.…”

Section: Introductionmentioning

confidence: 99%

The evolution of reproductive isolation in closely adjacent plant populations through differential flowering time

Stam

1983

Heredity

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A model is proposed for the non-selective displacement of flowering time in closely adjacent plant populations. Numerical results obtained on a single locus model as well as a polygenic simulation model demonstrate that an environmental difference may trigger genetic divergence of flowering tune. This divergence results because there is non-random migration with respect to flowering time, which has effects like those demonstrated by Thoday and Gibson (1970) in an experiment in which selective migration alone gave genetic divergence between habitats with respect to sternopleural bristle number in Drosophila melanogaster.In view of the results it is suggested that the evolution of reproductive isolation may sometimes start through a selectively neutral process, which can secondarily enhance the adaptation to divergent selection regimes in adjacent plant populations.

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Section: Introductionmentioning

confidence: 99%

The evolution of reproductive isolation in closely adjacent plant populations through differential flowering time

Stam

1983

Heredity

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“…Population differentiation over short distances, within both plant and animal species, has recently attracted attention (Jain and Bradshaw, 1966); selection experiments (Thoday and Boam, 1959;Streams and Pimental, 1961) and field studies (Creed et al, 1959;Briggs, 1962;Snaydon, 1963;Aston and Bradshaw, 1966;McNeilly, 1968) indicate that geographical isolation is not essential for population differentiation to occur.…”

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confidence: 99%

RAPID POPULATION DIFFERENTIATION IN A MOSAIC ENVIRONMENT. I. THE RESPONSE OFANTHOXANTHUM ODORATUMPOPULATIONS TO SOILS

Snaydon

1970

Evolution

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“…But in one uncontaminated population, from the sea cliff, a great number of clones occurs. It is in a very severe environment in which very few other species can grow and very strong selection pressures operate (Aston and Bradshaw, 1966). It is difficult to know what to conclude, except that conditions of severe selection certainly do not lead to a reduction in the numbers of individual clones in a population, but rather to the maintenance of a large number.…”

Section: (C) Isoenzyme Techniquementioning

confidence: 99%

The potential for evolution of heavy metal tolerance in plants

1975

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A series of grasslands of different ages which have suffered copper pollution for different lengths of time have been used to follow the evolution of metal tolerance.Species diversity in the grasslands decreases with increasing pollution, so that in the most polluted sites only Agrostis stolon(fera, sometimes with Agrostis tenuis, is to be found. In the polluted sites there is a great deal of bare ground in the youngest (5 years old) grasslands but complete cover in the oldest grasslands (70 years old).The A. stolonjfera populations in unpolluted sites are not copper tolerant. But in the polluted sites there is an increase in the tolerance of individuals, and an increase in the frequency of tolerant individuals, as the age of the population increases: even the youngest population shows considerable tolerance.An analysis, using morphological and esterase isoenzyme variation as criteria, shows that the tolerant populations consist of a large number of different individual clones or genotypes. The populations must have evolved by the rapid selection of a large number of the tolerant or partly tolerant individuals which can be shown to exist in unpolluted populations at very low frequency.The selection can be shown to occur at both seedling and adult stages, and to cause the evolution of tolerance effectively in a single generation.

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Evolution in closely adjacent plant populations II. Agrostis stolonifera in maritime habitats

Cited by 122 publications

References 14 publications

The evolution of reproductive isolation in closely adjacent plant populations through differential flowering time

The evolution of reproductive isolation in closely adjacent plant populations through differential flowering time

RAPID POPULATION DIFFERENTIATION IN A MOSAIC ENVIRONMENT. I. THE RESPONSE OFANTHOXANTHUM ODORATUMPOPULATIONS TO SOILS

The potential for evolution of heavy metal tolerance in plants

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