Offspring fitness and parental effects as a function of inbreeding in Epilobium angustifolium (Onagraceae)

Article Abstract:

Offspring fitness and parental effects in Epilobium angustifolium (Onagraceae) are discussed as a function of inbreeding. Diallel crossing was used to study nuclear and parental effects on production and germination of offspring for self-full-sibling and outbred pollinations and seed-set and germination were significantly higher in offspring derived from outbred pollinations than from self-pollinations. Parental effects were responsible for a significant portion of the variation in seed-set and germination for the eight parent plants, 5-% maternal, 50% paternal and it appears that parents do not differentially provision inbred and outbred offspring so fitness differences can be attributed to nuclear genotypes.

Genetic aspects, Natural selection, Allelomorphism, Alleles, Inbreeding, Pollination, Sex in plants, Sex (Botany)

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Population cytotype structure in the polyploid Galax urceolata (Diapensiaceae)

Article Abstract:

Population cytotype structure in the polyploid Galax urceolata (Diapensiaceae) has been studied in the Blue Ridge Mountains of the US where the geographical distributions of diploid and polyploid G. urceolata overlap. The investigation was intended to shed light on evolutionary forces governing establishment of polyploids and their coexistence with diploids. Importance of frequency-dependent mating success and ecological sorting for distribution of polyploids/diploids is discussed.

United States, Flow cytometry, Plant population genetics, Ploidy

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Fecundity and offspring ploidy in matings among diploid, triploid and tetraploid Chamerion angustfolium (Onagraceae): consequences for tetraploid establishment

Article Abstract:

Consequences of tetraploid establishment have been studied using analysis of fecundity and offspring ploidy in matings of tetraploid, triploid, and diploid Chamerion angustfolium plants. Computer simulations based on results showed that unreduced gamete formation via triploids in C. augustifolium can promote the coexistence of diploids and tetraploids, but due to law triploid fitness, is not sufficient to overcome tetraploid minority disadvantage.

Heredity, Computer simulation, Polyploidy

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