EFFECTS OF SERIAL INBREEDING ON FITNESS COMPONENTS IN IMPATIENS CAPENSIS.
Studies of inbreeding depression in wild plants customarily compare the fitness of outcrossed progeny to progeny derived from one generation of self-pollination. We compare levels of inbreeding depression in a greenhouse in two populations of jewelweed using progeny derived from random outcrosses, one generation of self-pollination, and three generations of selling. The progeny have expected inbreeding coefficients of, respectively, 0, 0.5, and 0.875. Seedling survivorship declined linearly with the level of inbreeding in both populations. Inbreeding also increased the variability of emergence date. Maternal family membership affected early seedling performance and often interacted significantly with the level of inbreeding. In contrast, path analyses reveal that inbreeding had both negative linear and positive quadratic direct effects on seed and final plant weight, causing the highly inbred progeny to outperform progeny derived from one generation of selfing. These results suggest either the rapid purging of deleterious alleles or diminishing epistasis among the loci affecting these characters. It is not clear why the loci affecting survival responded differently.
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Related Subject Headings
- Evolutionary Biology
- 3104 Evolutionary biology
- 3103 Ecology
- 0603 Evolutionary Biology
- 0602 Ecology
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Evolutionary Biology
- 3104 Evolutionary biology
- 3103 Ecology
- 0603 Evolutionary Biology
- 0602 Ecology