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Inbreeding depression in Nigella degenii (Ranunculaceae): Fitness components compared with morphological and phenological characters

Ellmer, Maarten LU and Andersson, Stefan LU (2004) In International Journal of Plant Sciences 165(6). p.1055-1061
Abstract
We have compared selfed and outbred offspring from individual plants of the annual plant Nigella degenii to examine patterns of inbreeding depression in two direct components of fitness ( flower number and pollen viability) and a number of morphological or phenological characters for which the optimal phenotype may be habitat specific. Selfing lowered flower number, plant height, flower size, and pollen viability and caused a shift toward later germination and flowering dates. There was no significant difference in inbreeding depression between fitness components and characters reflecting morphology or phenology regardless of how inbreeding response was estimated. Family-level analyses revealed moderately strong correlated responses... (More)
We have compared selfed and outbred offspring from individual plants of the annual plant Nigella degenii to examine patterns of inbreeding depression in two direct components of fitness ( flower number and pollen viability) and a number of morphological or phenological characters for which the optimal phenotype may be habitat specific. Selfing lowered flower number, plant height, flower size, and pollen viability and caused a shift toward later germination and flowering dates. There was no significant difference in inbreeding depression between fitness components and characters reflecting morphology or phenology regardless of how inbreeding response was estimated. Family-level analyses revealed moderately strong correlated responses involving flower number and each of the nonfitness characters, whereas pollen viability showed an independent response to inbreeding. On the basis of these observations, we hypothesize that morphology and phenology could make a significant contribution to lifetime inbreeding depression in N. degenii, that inbreeding responses in different types of characters involve loci with both general and specific effects on the phenotype, and that morphological inbreeding depression has contributed to the evolutionary reduction of floral structures so prevalent in the Nigella arvensis complex. (Less)
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Contribution to journal
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published
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in
International Journal of Plant Sciences
volume
165
issue
6
pages
1055 - 1061
publisher
University of Chicago Press
external identifiers
  • wos:000226245600014
  • scopus:12844261242
ISSN
1058-5893
language
English
LU publication?
yes
id
0cb440b8-a07a-4b05-a20a-82ec69d509ea (old id 147121)
alternative location
http://lup.lub.lu.se/luur?func=downloadFile&fileOId=625115
date added to LUP
2007-07-02 09:35:03
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2017-01-01 06:38:00
@article{0cb440b8-a07a-4b05-a20a-82ec69d509ea,
  abstract     = {We have compared selfed and outbred offspring from individual plants of the annual plant Nigella degenii to examine patterns of inbreeding depression in two direct components of fitness ( flower number and pollen viability) and a number of morphological or phenological characters for which the optimal phenotype may be habitat specific. Selfing lowered flower number, plant height, flower size, and pollen viability and caused a shift toward later germination and flowering dates. There was no significant difference in inbreeding depression between fitness components and characters reflecting morphology or phenology regardless of how inbreeding response was estimated. Family-level analyses revealed moderately strong correlated responses involving flower number and each of the nonfitness characters, whereas pollen viability showed an independent response to inbreeding. On the basis of these observations, we hypothesize that morphology and phenology could make a significant contribution to lifetime inbreeding depression in N. degenii, that inbreeding responses in different types of characters involve loci with both general and specific effects on the phenotype, and that morphological inbreeding depression has contributed to the evolutionary reduction of floral structures so prevalent in the Nigella arvensis complex.},
  author       = {Ellmer, Maarten and Andersson, Stefan},
  issn         = {1058-5893},
  language     = {eng},
  number       = {6},
  pages        = {1055--1061},
  publisher    = {University of Chicago Press},
  series       = {International Journal of Plant Sciences},
  title        = {Inbreeding depression in Nigella degenii (Ranunculaceae): Fitness components compared with morphological and phenological characters},
  volume       = {165},
  year         = {2004},
}