EFFECTS OF SERIAL INBREEDING ON FITNESS COMPONENTS IN IMPATIENS CAPENSIS.

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • McCall, C; Waller, DM; Mitchell-Olds, T

Published Date

  • June 1, 1994

Published In

Volume / Issue

  • 48 / 3

Start / End Page

  • 818 - 827

PubMed ID

  • 28568261

Electronic International Standard Serial Number (EISSN)

  • 1558-5646

International Standard Serial Number (ISSN)

  • 0014-3820

Digital Object Identifier (DOI)

  • 10.1111/j.1558-5646.1994.tb01364.x

Language

  • eng