Protogyny in Plantago lanceolata populations: an adaptation to pollination by wind?

Bos, Marten; Steen, R.; Harmens, Harry

doi:10.1007/978-3-642-70837-4_21

Cited by 12 publications

(13 citation statements)

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“…This report presents the measurement of the genetic structure in a field population and estimates of gene flow in the self-incompatible, windpollinated, perennial, herbacious plant species Plantago lanceolata L. The species shows the typical syndrome of anemophilous species (sensu Faegri and van der Pijl, 1973): reduced flowers with extending anthers, with sticky, feathery stigmas, large amounts of non-sticky pollen grains with a diameter of 20-30 pm (Hammer, 1978;Primack, 1978;Bos et al, 1985). However some populations of the species are also reported to be insect pollinated (Stelleman, 1984).…”

Section: Introductionmentioning

confidence: 99%

Gene flow in Plantago I. Gene flow and neighbourhood size in P. lanceolata

1986

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The genetic population structure and gene flow in the obligatory outbreeding plant species Plantago lanceolata L. were determined in the Westduinen (Wd) pasture population in the South-West of the Netherlands. Three experiments were performed: the measurement of genetic structure using allozyme variation, pollen flow in a wind-tunnel and the distribution of an allozyme marker in a garden experiment. The position and allozyme genotype of 524 plants from eight subpopulations in the Westduinen population were determined. The population exhibited local differentiation: genotype frequencies within subpopulations were mostly in Hardy-Weinberg equilibrium, and gene frequencies varied significantly between subpopulations. The wind-tunnel experiments showed that wind speed, source height and capture height of pollen influenced the pollen-mediated gene flow and therefore neighbourhood sizes. In the garden experiment a clear picture of actual pollen flow could be shown.Estimates of neighbourhood and gene transport parameters from the data of the three experiments indicated restricted gene flow: neighbourhood size (NJ was between 14 and 20 plants, mean gene transport per generation (M) between 02 and 14 metres. We argue that this combination of small effective number and low gene transport leads to the substructuring of the Westduinen population of P. lanceolata.

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Section: Introductionmentioning

confidence: 99%

Gene flow in Plantago I. Gene flow and neighbourhood size in P. lanceolata

1986

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“…Since the selection effect was discovered during the study, and the intensity of pollination was not accurately controlled during the crosses presented in Tables 1-4, chance variation could be partly responsible for the pattern of variation of the gametophytic selection effect. Alternatively, unknown differences in genetic background, for example with respect to the degree of protogyny (Bos et al, 1985) or the stickiness of pollen (Tonsor, 1985) could play a role.…”

Section: Discussionmentioning

confidence: 97%

A restorer gene in gynodioecious Plantago coronopus subject to selection in the gametophytic and seedling stage

Damme

1991

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The genetic basis of male sterility in the gynodioecious species Plantago coronopus was studied. As the aim was to find strains with a single, varying nuclear locus for male sterility, cytoplasmic variation was avoided by starting with one open pollinated female. The progeny appeared to vary for a single locus with the homozygous recessive being male sterile. The locus was designated msl. Expected segregation ratios were disturbed by two different factors, both leading to a shortage of male steriles. An accidental drought in Petri dishes caused a relatively higher mortality of seedlings with a male sterility genotype in most cases. When this effect was avoided a systematic shortage of male steriles remained in many crosses. An experiment with varying levels of pollen competition justified the interpretation that selection at the gametophytic stage was involved. Pollen carrying the sterility allele was estimated to have a fertilization success relative to pollen with the restorer allele of 0.56. Finally the role of the msl locus in the genetics of male sterility in natural populations was assessed by crossing heterozygously and homozygously restored plants with male steriles collected from the wild. It appeared that the inheritance of male sterility is more complicated than the msl locus alone, which was expected. If the selection effects on the msl locus observed in this study occur in nature, this would have interesting consequences for the evolutionary dynamics of gynodioecy.

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“…Differences in root contraction (and in withdrawal of the apical meristem into the ground) cause varying vulnerability of the shoot to treading. In the protogynous flower the style appears first; hereafter the corolla lobes will reflex and the anthers emerge (Bos et al 1985;Fig. major, P. media, P. coronopus and P. lanceolala were subjected to a daily rhythm of mechanical pressure, Blom (1979) found P. lanceolala -the species with the lowest root contraction -to be the one most susceptible to mechanical pressure.…”

Section: General Morphology In Plantagomentioning

confidence: 99%