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Sexual reproduction in the phyllodioicous bryophyte Homalothecium lutescens (Hedw.) H.Rob. in relation to habitat age, growth conditions and genetic variation

Rosengren, Frida LU ; Cronberg, Nils LU ; Reitalu, Triin LU and Prentice, Honor C LU (2014) In Journal of Bryology 36(3). p.200-208
Abstract
Sporophyte production and female fertility were investigated in seventeen calcareous grassland demes of the moss Homalothecium lutescens (Hedw.) H.Rob. on the Baltic island of Öland, with the aim of understanding the relationships between sexual reproduction, habitat age, genetic variation and factors related to growth conditions. The overall proportion of fertile female shoots (with perichaetia) was 35%. Fertility status at the level of individual shoots was positively associated with shoot length and density, while within deme fertility was positively associated with bush cover. There was no association between female fertility and habitat age, genetic diversity (HS) or allelic richness. Out of 1344 investigated shoots, only two were... (More)
Sporophyte production and female fertility were investigated in seventeen calcareous grassland demes of the moss Homalothecium lutescens (Hedw.) H.Rob. on the Baltic island of Öland, with the aim of understanding the relationships between sexual reproduction, habitat age, genetic variation and factors related to growth conditions. The overall proportion of fertile female shoots (with perichaetia) was 35%. Fertility status at the level of individual shoots was positively associated with shoot length and density, while within deme fertility was positively associated with bush cover. There was no association between female fertility and habitat age, genetic diversity (HS) or allelic richness. Out of 1344 investigated shoots, only two were normal-sized fertile males. Dwarf males were also extremely rare, and found almost exclusively on shoots with sporophytes. Few sporophytes were observed (in the two demes with highest fertility and bush cover). No relationship between genetic variation and the frequency of sporophytes and males was found. The lack of a relationship between sexual reproduction and genetic variation suggests that sexual reproduction may not occur in the same grassland fragments as the recruitment of new clones (from spores or vegetative fragments). The majority of the dry, open grassland habitats, where H. lutescens is typically found in the study area, appear to be suboptimal for both dwarf males and fertilization. Sexual reproduction is more likely to occur in shaded (although grazed) grassland patches, where moisture levels are likely to be higher and the moss colonies are generally more vigorous. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Calcareous grassland, Dwarf males, Fertility, Genetic variation, Recruitment
in
Journal of Bryology
volume
36
issue
3
pages
200 - 208
publisher
Maney Publishing
external identifiers
  • wos:000346159600004
  • scopus:84906219613
ISSN
1743-2820
DOI
10.1179/1743282014Y.0000000114
project
BECC
language
English
LU publication?
yes
id
8212ae4c-f82e-4914-b804-d8e86bdf1009 (old id 4690663)
date added to LUP
2014-10-03 11:17:12
date last changed
2017-01-01 04:04:53
@article{8212ae4c-f82e-4914-b804-d8e86bdf1009,
  abstract     = {Sporophyte production and female fertility were investigated in seventeen calcareous grassland demes of the moss Homalothecium lutescens (Hedw.) H.Rob. on the Baltic island of Öland, with the aim of understanding the relationships between sexual reproduction, habitat age, genetic variation and factors related to growth conditions. The overall proportion of fertile female shoots (with perichaetia) was 35%. Fertility status at the level of individual shoots was positively associated with shoot length and density, while within deme fertility was positively associated with bush cover. There was no association between female fertility and habitat age, genetic diversity (HS) or allelic richness. Out of 1344 investigated shoots, only two were normal-sized fertile males. Dwarf males were also extremely rare, and found almost exclusively on shoots with sporophytes. Few sporophytes were observed (in the two demes with highest fertility and bush cover). No relationship between genetic variation and the frequency of sporophytes and males was found. The lack of a relationship between sexual reproduction and genetic variation suggests that sexual reproduction may not occur in the same grassland fragments as the recruitment of new clones (from spores or vegetative fragments). The majority of the dry, open grassland habitats, where H. lutescens is typically found in the study area, appear to be suboptimal for both dwarf males and fertilization. Sexual reproduction is more likely to occur in shaded (although grazed) grassland patches, where moisture levels are likely to be higher and the moss colonies are generally more vigorous.},
  author       = {Rosengren, Frida and Cronberg, Nils and Reitalu, Triin and Prentice, Honor C},
  issn         = {1743-2820},
  keyword      = {Calcareous grassland,Dwarf males,Fertility,Genetic variation,Recruitment},
  language     = {eng},
  number       = {3},
  pages        = {200--208},
  publisher    = {Maney Publishing},
  series       = {Journal of Bryology},
  title        = {Sexual reproduction in the phyllodioicous bryophyte Homalothecium lutescens (Hedw.) H.Rob. in relation to habitat age, growth conditions and genetic variation},
  url          = {http://dx.doi.org/10.1179/1743282014Y.0000000114},
  volume       = {36},
  year         = {2014},
}