Inbreeding depression and partial selfing: evolutionary implications of mixed-mating in a coastal endemic, Silene douglasii var. oraria (Caryophyllaceae)
Article Abstract:
Evolutionary implications of mixed mating have been studied in a coastal plant, Silene douglasii var. oraria (Caryophyllaceae), a perennial tetraploid, in glasshouse and field studies of pollination and inbreeding. Both selfing and high inbreeding depression have been studied because both have an role in evolution and persistence of rare plants. Hand pollinations gave pollen above that from ovule production gave more seeds than marked open-pollinated flowers. Pollen limitation of seed production would appear to exist. But among-year differences in reproductive success after open pollination indicate the pollination levels vary with time. In pollinations matched by maternal family, selfing brought significantly lower seed production than outcrossing. Reproductive assurance gives the most logical explanation for the coexistence of moderate selfing and high inbreeding depression in this very protandrous plant. It had been thought to be highly outcrossing
Publication Name: Heredity
Subject: Biological sciences
ISSN: 0018-067X
Year: 1999
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Genomic coalescence in a population of Laxmannia sessiliflora (Angiospermae, Anthericaceae): an association of lethal polymorphism, self-pollination and chromosome number reduction
Article Abstract:
A population of Laxmannia sessiliflora (Angiospermae, Anthericaceae) is Australia is seen as representing a natural demonstration of genomic coalescence in which devices that cut the number of independently segregating supergenes heterozygous for recessive lethals are raised to a high rate by inbreeding. Genomic coalescence has been studied in a population of the plant, which has a polymorphism for seed-aborting lethal equivalents and significant levels of self-pollination. The population suggests a means for dysploid chromosome number reduction to be promoted by natural selection in natural population systems. It combines the taxonomically significant sessile inflorescences of L. sessiliflora Dcne. and the derived breeding system of L. ramosa Lindl.
Publication Name: Heredity
Subject: Biological sciences
ISSN: 0018-067X
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
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