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Patterns of inbreeding depression in a population of Brassica cretica (Brassicaceae): evidence from family-level analyses

Rao, G Y; Widén, Björn LU and Andersson, Stefan LU (2002) In Biological Journal of the Linnean Society 76(3). p.317-325
Abstract
In this investigation, we have collected family-structured data from a partly self-compatible, outcrossing population of Brassica cretica to estimate and compare the effects of one-generation selfing on different types of characters. Inbreeding not only depressed characters that should be positively correlated with fitness irrespective of habitat, e.g. germinability, leaf number and inflorescence size, but also resulted in later flowering, smaller and more asymmetric flowers, and an increased production of basal branches. Population-level estimates of inbreeding depression were similar in magnitude to estimates reported in other wild plant species. There was a tendency for direct components of fitness to exhibit a stronger response to... (More)
In this investigation, we have collected family-structured data from a partly self-compatible, outcrossing population of Brassica cretica to estimate and compare the effects of one-generation selfing on different types of characters. Inbreeding not only depressed characters that should be positively correlated with fitness irrespective of habitat, e.g. germinability, leaf number and inflorescence size, but also resulted in later flowering, smaller and more asymmetric flowers, and an increased production of basal branches. Population-level estimates of inbreeding depression were similar in magnitude to estimates reported in other wild plant species. There was a tendency for direct components of fitness to exhibit a stronger response to inbreeding than other characters, but only when the differences between selfed and outbred offspring were measured in standard deviation units. Family-level estimates of inbreeding depression were weakly correlated across characters. Given these and other observations, we hypothesize that the genetic basis of inbreeding depression varies across the life cycle and that changes in local inbreeding will lead to shifts in the mean phenotypes of B. cretica populations. However, judging from data on current levels of population divergence, quite large changes in inbreeding will be required to influence large-scale patterns of variation in this species. (C) 2002 The Linnean Society of London. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biological Journal of the Linnean Society
volume
76
issue
3
pages
317 - 325
publisher
Linnean Society of London
external identifiers
  • wos:000177113100001
  • scopus:0036657001
ISSN
0024-4066
DOI
10.1046/j.1095-8312.2002.00069.x
language
English
LU publication?
yes
id
feef273b-3862-498c-a098-f91d071e6b3b (old id 147185)
date added to LUP
2007-07-02 13:39:47
date last changed
2017-01-01 04:33:57
@article{feef273b-3862-498c-a098-f91d071e6b3b,
  abstract     = {In this investigation, we have collected family-structured data from a partly self-compatible, outcrossing population of Brassica cretica to estimate and compare the effects of one-generation selfing on different types of characters. Inbreeding not only depressed characters that should be positively correlated with fitness irrespective of habitat, e.g. germinability, leaf number and inflorescence size, but also resulted in later flowering, smaller and more asymmetric flowers, and an increased production of basal branches. Population-level estimates of inbreeding depression were similar in magnitude to estimates reported in other wild plant species. There was a tendency for direct components of fitness to exhibit a stronger response to inbreeding than other characters, but only when the differences between selfed and outbred offspring were measured in standard deviation units. Family-level estimates of inbreeding depression were weakly correlated across characters. Given these and other observations, we hypothesize that the genetic basis of inbreeding depression varies across the life cycle and that changes in local inbreeding will lead to shifts in the mean phenotypes of B. cretica populations. However, judging from data on current levels of population divergence, quite large changes in inbreeding will be required to influence large-scale patterns of variation in this species. (C) 2002 The Linnean Society of London.},
  author       = {Rao, G Y and Widén, Björn and Andersson, Stefan},
  issn         = {0024-4066},
  language     = {eng},
  number       = {3},
  pages        = {317--325},
  publisher    = {Linnean Society of London},
  series       = {Biological Journal of the Linnean Society},
  title        = {Patterns of inbreeding depression in a population of Brassica cretica (Brassicaceae): evidence from family-level analyses},
  url          = {http://dx.doi.org/10.1046/j.1095-8312.2002.00069.x},
  volume       = {76},
  year         = {2002},
}