A comparison of levels of genetic polymorphism and self-compatibility in geographically restricted and widespread plant congeners

Karron, Jeffrey D.

doi:10.1007/bf02067268

“…It is well known that genetic variability within and among populations is related to the mating system and geographical distribution in a wide range of plant species (Hamrick et aL, 1979;Loveless & Hamrick, 1984;Karron, 1987;Hamrick & Godt, 1989). On the basis of such work, our two study species, C. repandum and C. hederifolium, by virtue of their fairly wide-ranging distribution across the northern part of the Mediterranean Basin, could be (Goudet, 1995).…”

Section: Discussionmentioning

confidence: 99%

“…Genetic diversity and mating system in relation to geographically restricted Cyclamen species Restricted species may often contain significantly lower amounts of genetic variability than widespread species but may show greater genetic differentiation among populations as a result of founder effects, genetic drift, and/or inbreeding in smaller populations (Hamrick et al, 1979;Loveless & Hamrick, 1984;Karron, 1987Karron, , 1991Hamrick & Godt, 1989).…”

Section: Hedenfoliummentioning

confidence: 99%

“…Geographically widespread, outcrossing animal-pollinated species tend to have higher levels of genetic variation within populations and to maintain lower levels of differentiation among populations than restricted, inbreeding species (Hamrick et al, 1979;Loveless & I-Iamrick, 1984;Karron, 1987Karron, , 1991Hamrick & Godt, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…205 Linhart & Premoli, 1993) and Karron (1987) has pointed out the difficulty of drawing conclusions about such predictions from studies of unrelated taxa. A useful approach to the study of the relationship between mating system, geographical distribution and patterns of genetic diversity is thus the comparison of closely related taxa.…”

Section: Introductionmentioning

confidence: 99%

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Variation in the population genetic structure of two Cyclamen species on the island of Corsica

Affre¹,

Thompson²

1997

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Cyclamen repandum and C. hedenfolium occur in sympatry in many sites across their distributions but flower at different times. A previous controlled pollination experiment on plants of the two species collected on the island of Corsica showed no evidence of inbreeding depression over all measured life cycle stages in C. repandum, whereas C. hederifolium showed inbreeding depression (multiplicative (5 0.49) on fruit maturation and seed production. This suggests that C. repandum may have a greater history of inbreeding than C. hederifolium. In this paper, we examine whether within-population heterozygosity and among-population differentiation on Corsica are consistent with the hypothesis that C. repandum is more inbred than C. hederifolium. Cyclamen hederifolium showed a higher percentage of polymorphic loci, mean number of alleles per locus and mean observed heterozygosity than C. repandum. Cyclamen repandum showed higher among population differentiation (FST =0.415) than C. hederifolium (FST = 0.131). The within-population fixation index was greater in C. repandum (F1 = 0.658) than in C. hederifolium (F1 = 0.329). Cyclamen repandum thus appears to have a greater history of inbreeding than C. hederifolium. The variation in the mating system of the two species is discussed in relation to their sympatric occurrence and data from previous work on the population genetic structure of island populations of other geographically restricted Cyclamen species

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“…Geographically restricted species have also been found to have higher rates of self-pollination (Karron, 1987(Karron, , 1991.…”

Section: Introductionmentioning

confidence: 99%

Variation in the population genetic structure of two Cyclamen species on the island of Corsica

AFFRE¹,

Thompson²

1997

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Cyclamen repandum and C. hedenfolium occur in sympatry in many sites across their distributions but flower at different times. A previous controlled pollination experiment on plants of the two species collected on the island of Corsica showed no evidence of inbreeding depression over all measured life cycle stages in C. repandum, whereas C. hederifolium showed inbreeding depression (multiplicative (5 0.49) on fruit maturation and seed production. This suggests that C. repandum may have a greater history of inbreeding than C. hederifolium. In this paper, we examine whether within-population heterozygosity and among-population differentiation on Corsica are consistent with the hypothesis that C. repandum is more inbred than C. hederifolium. Cyclamen hederifolium showed a higher percentage of polymorphic loci, mean number of alleles per locus and mean observed heterozygosity than C. repandum. Cyclamen repandum showed higher among population differentiation (FST =0.415) than C. hederifolium (FST = 0.131). The within-population fixation index was greater in C. repandum (F1 = 0.658) than in C. hederifolium (F1 = 0.329). Cyclamen repandum thus appears to have a greater history of inbreeding than C. hederifolium. The variation in the mating system of the two species is discussed in relation to their sympatric occurrence and data from previous work on the population genetic structure of island populations of other geographically restricted Cyclamen species

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Higher ploidy is associated with reduced range breadth in the Potentilleae tribe

Brittingham

¹

,

Koski

²

,

Ashman

³

2018

American J of Botany

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A comparison of levels of genetic polymorphism and self-compatibility in geographically restricted and widespread plant congeners

Cited by 353 publications

References 56 publications

Variation in the population genetic structure of two Cyclamen species on the island of Corsica

Variation in the population genetic structure of two Cyclamen species on the island of Corsica

Variation in the population genetic structure of two Cyclamen species on the island of Corsica

Higher ploidy is associated with reduced range breadth in the Potentilleae tribe

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