Adaptation and the breeding system in groundsel

Haskell, Gordon

doi:10.1007/bf01690630

Cited by 25 publications

(12 citation statements)

References 9 publications

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“…Indeed, there are several reasons why our experimental methods may have directly inflated the usual levels of outcrossing in natural populations. First, the field studies were conducted at a time of year when insects that may act as pollinating vectors (see Haskell, 1953) were plentiful and, in contrast with Hull (1 974a) we observed that rayed and rayless capitula are frequently visited by a range of insects. Secondly, the presence of a large number of rayed individuals and therefore relatively "showy" capitula in the experimental area may have increased the overall amount of insect activity and consequently boosted the usual outcrossing level.…”

Section: Discussioimentioning

confidence: 74%

“…GROUNDSEL, Senecio vulgaris L., has been cited as a flowering plant species which is eminently suitable for genetic studies since it combines a short generation time, rapid germination and simple growth requirements (Haskell, 1953;Harland, 1954). However, apart from early work by Trow (1912, 191 6a, b) the species has attracted little attention from geneticists until a recent series of studies by Hull (1974aHull ( , b, 1975, Richards (1975) and Abbott (1 976a,b).…”

Section: Introductionmentioning

confidence: 99%

“…However, apart from early work by Trow (1912, 191 6a, b) the species has attracted little attention from geneticists until a recent series of studies by Hull (1974aHull ( , b, 1975, Richards (1975) and Abbott (1 976a,b). In the literature, S. vulgaris is reported to be predominantly self-pollinated (Haskell, 1953;Fryxell, 1957) and Gibbs, Milne and VargasCarrillo (1975) have recently shown that it is a species which combines an ability to set seed by autogamy with several other features associated with well-established inbreeders, e.g. inconspicuous capitula, low pollen yield and a high recombination index.…”

Section: Introductionmentioning

confidence: 99%

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Variability of outcrossing frequency in Senecio vulgaris L.

Campbell

Abbott

1976

Heredity

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SUMMARYUsing a marker gene controlling capitulum type, 30 lines derived from each of a dune and a garden population of Senecio vulgaris L. were tested for their tendency to outcross. Compared with previous estimates of outbreeding in the species a relatively high degree of outcrossing was found in both experimental populations (an overall average of 224 per cent). It was shown that the dune population had a slightly greater mean outcrossing frequency than the garden population but, more importantly, had significantly more heritable variation (between lines) for this trait. In discussion, some reasons are advanced to account for the unexpectedly high level of outcrossing in both populations. It is suggested that the presence of significant genetic variation for outcrossing within the dune population may provide for adaptive flexibility in the native dune habitat where there is much spatial and temporal variation of the environment.

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Section: Discussioimentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variability of outcrossing frequency in Senecio vulgaris L.

Campbell

Abbott

1976

Heredity

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“…vulgaris has long been regarded as an inbreeder (Haskell, 1953). The demonstration of pollen inhibition and self-incompatibility systems within this species should cause us to look more closely at other species traditionally considered to be inbreeders.…”

Section: Inhibition Of Self Pollen Germination In Disc Floretsmentioning

confidence: 99%

Inhibition of self pollen germination in Senecio vulgaris L.

1988

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Experiments are described which show that Senecio vulgaris L. (common groundsel) possesses two independent systems which inhibit the germination of self pollen. In one system, self but not cross pollen tube penetration of the stigma is prevented in the ray florets of a proportion of radiate plants. In the other system, cross pollen adheres in greater quantity than self pollen 24 hours after application to disc floret stigmas of both radiate and non-radiate plants. The possible origins of these systems, and their functions in natural populations, are discussed.

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“…Haskell (1953) reviewed opinions concerning the breeding system in S. vulgaris held in the first half of this century. The consensus was that it indulged in only small amounts of outcrossing.…”

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confidence: 99%

Outcrossing frequencies within- and between-capitulum morphs in groundsel Senecio vulgaris L.

Warren

1988

Heredity

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Estimates of both within-and between-capitulum morph outcrossing in outdoor experimental plots of Senecio vulgaris L. show that non-radiate plants may outbreed at similar levels to radiate plants. Pure stands of both radiate and non-radiate plants were found to exhibit intra-morph outcrossing frequencies of about 17 per cent. In polymorphic plots however, pollinators appear to visit the radiate morph in preference to the non-radiate morph. This insect behaviour is shown to be related to the attractiveness of the ray florets. The implications of the results to the maintenance of the capitulum polymorphism in natural populations are discussed.INTRODUCTION.

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Adaptation and the breeding system in groundsel

Cited by 25 publications

References 9 publications

Variability of outcrossing frequency in Senecio vulgaris L.

Variability of outcrossing frequency in Senecio vulgaris L.

Inhibition of self pollen germination in Senecio vulgaris L.

Outcrossing frequencies within- and between-capitulum morphs in groundsel Senecio vulgaris L.

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