title: Inbreeding depression and heterosis in populations of Schiedea viscosa, a highly selfing species.
abstract: Progeny from self-pollinations and intrapopulation crosses were examined in Schiedea viscosa to determine the extent of inbreeding depression in this highly selfing species. Progeny of interpopulation crosses were also investigated to determine whether deleterious alleles have been fixed in populations of S. viscosa. There was no inbreeding depression at early life history stages, including seeds per capsule, seed mass, or germination. Inbreeding depression was detected for the later life history stage of fruit biomass, although not for survival or life span. Heterosis for vegetative biomass and fruit biomass was detected in progeny from crosses between populations. Levels of inbreeding depression in S. viscosa are low relative to out-crossing species of Schiedea, especially when early life history stages are compared.
authors.affiliation: Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, USA. sgweller@uci.edu
authors.forename: S G
authors.initials: SG
authors.lastname: Weller
authors.forename: A K
authors.initials: AK
authors.lastname: Sakai
authors.forename: D A
authors.initials: DA
authors.lastname: Thai
authors.forename: J
authors.initials: J
authors.lastname: Tom
authors.forename: A E
authors.initials: AE
authors.lastname: Rankin
mesh_terms: D000367:Age Factors; D018533:Biomass; D029748:Caryophyllaceae / Q000235:genetics*; D005638:Fruit / Q000254:growth & development; D005828:Genetics, Population; D006254:Hawaii; D006823:Hybrid Vigor / Q000235:genetics*; D007178:Inbreeding; D007527:Isoenzymes / Q000235:genetics; D012098:Reproduction / Q000235:genetics; D012639:Seeds / Q000254:growth & development
chemical_list: D007527:Isoenzymes