The reproductive biology of Polytrichum formosum: clonal structure and paternity revealed by microsatellites

@article{vanderVelde2001TheRB,
  title={The reproductive biology of Polytrichum formosum: clonal structure and paternity revealed by microsatellites},
  author={Marco van der Velde and Heinjo J. During and Louis van de Zande and Rudolf Bijlsma},
  journal={Molecular Ecology},
  year={2001},
  volume={10}
}
Using highly polymorphic microsatellite markers, we assessed clonal structure and paternity in a population of the bryophyte species Polytrichum formosum. Identical multilocus genotypes of individual shoots were almost never observed in spatially separated cushions, but were found to be highly clustered within moss cushions. Therefore, asexual reproduction through dispersal of gametophyte fragments is not very important in P. formosum. However, asexual reproduction on a very localized scale… 
Multiple paternity and sporophytic inbreeding depression in a dioicous moss species
TLDR
Results indicate that polyandry provides the opportunity for postfertilization selection in bryophytes having short fertilization distances and spatially structured populations facilitating inbreeding, and preferential maternal support of the more heterozygous sporophytes suggests active inbreeding avoidance that may have significant implications for mating system evolution in b Bryophytes.
Phylogeography of five Polytrichum species within Europe
TLDR
Findings suggest that R juniperinum has recolonized Europe after the latest glacial period from two different refugia, one possibly being the British Isles.
Balance between inbreeding and outcrossing in a nannandrous species, the moss Homalothecium lutescens
TLDR
In conclusion, sporadic fertilizations by dwarf males originating from nonhost female shoots appear to counteract strong inbreeding.
Factors influencing reproductive success in the clonal moss, Hylocomium splendens
TLDR
This study is the first to incorporate into one model the relative importance of several factors for bryophyte reproductive success, and demonstrate the value of multiple-predictor approaches in studies of reproductive success.
Decoupling of Sexual Reproduction and Genetic Diversity in the Female-Biased Mojave Desert Moss Syntrichia caninervis (Pottiaceae)
TLDR
The results of this study support the idea that established populations can persist through cloning and that migration can occur over large physical distances.
Colonization dynamics of the clonal moss Hylocomium splendens on islands in a Baltic land uplift area: reproduction, genet distribution and genetic variation
TLDR
The number of clones and the tendency of colonies to be multiclonal, increased significantly with increasing age of islands, whilst their mean size decreased significantly, and genetic variation was accumulating with increasing population age.
Ubiquitous genetic diversity in ISSR markers between and within populations of the asexually producing moss Pleurochaete squarrosa
TLDR
The ubiquitous genetic variability detected in P. squarrosa can be related to continuous, occasionally massive, short-range recruitment of propagules, and to the high degree of intermingling, both favoured by the modality of vegetative reproduction and growth occurring in the species.
Hybridization and asymmetric reproductive isolation between the closely related bryophyte taxa Polytrichum commune and P. uliginosum
TLDR
It is shown here that reproductive isolation between these taxa is far more complex and highly asymmetric, and the high frequency of hybrid sporophytes observed suggests that viable spores may be formed occasionally through such rare processes as chromosome nondisjunction.
Exploring the Genetic Consequences of Clonality in Haplodiplontic Taxa.
TLDR
Not only was partialClonality found to act as a homogenizing force, but the combined effects of proportion of haploids, rate of clonality, and the relative strength of mutation versus genetic drift impacts the distributions of population genetic indices.
...
...

References

SHOWING 1-10 OF 77 REFERENCES
Genetic structure of Polytrichum formosum in relation to the breeding system as revealed by microsatellites
TLDR
Low levels of population differentiation observed for both types of genetic markers are probably best explained by a high level of effective spore dispersal (gene flow) between populations, and on a large geographical scale sexual reproduction is the most important determinant of the genetic structure of P. formosum.
The clonal and population structure of a rare endemic plant, Wyethia reticulata (Asteraceae): allozyme and RAPD analysis
TLDR
It is postulated that large, long‐lived clones dominated genetic relationships within populations but also provided opportunities for gene flow between populations on a longer time scale.
Amount and structure of intra- and interspecific genetic variation in the moss genus Polytrichum
TLDR
Allozyme electrophoresis was used to determine amount and structure of genetic variation within and between five congeneric haploid moss species, suggesting that the morphological conservatism is not due to lack of genetic variability and evolutionary potential.
CONTRIBUTIONS OF SEXUAL AND ASEXUAL REPRODUCTION TO POPULATION STRUCTURE IN THE CLONAL SOFT CORAL, ALCYONIUM RUDYI
  • C. McFadden
  • Biology, Environmental Science
    Evolution; international journal of organic evolution
  • 1997
TLDR
The population structure of the temperate soft coral, Alcyonium rudyi, a typical clonal species whose sexually produced larvae and asexually produced ramets both have very low dispersal capabilities is examined, and inbreeding does not appear to contribute significantly to the population structure.
Local genetic and clonal structure in the tropical terrestrial bromeliad, Aechmea magdalenae
TLDR
The genetic structure of populations of the clone-forming tropical terrestrial bromeliad, Aechmea magdalenae, was examined by electrophoretic analyses in nine populations occurring on and near Barro Colorado Island, Republic of Panama, indicating that clonal spread is local; individuals sharing multilocus genotypes most often occur within 10 m of each other.
Microgeographic genetic variation in the haploid and diploid stages of the moss Polytrichum juniperinum Hedw.
  • D. Innes
  • Biology, Environmental Science
    Heredity
  • 1990
TLDR
Electrophoretic variability at six enzyme loci was used to examine genotypic variation in the haploid and diploid stages of the moss Polytrichum juniperinum Hedw, suggesting that mating was occurring predominantly between female and male gametophytes within the same site.
Clonal structure and patterns of allozyme diversity in the rare endemic Cycladenia humilis var. jonesii (Apocynaceae).
TLDR
This study suggests that other reasons for low fruit set in Jones cycladenia, such as resource or pollinator limitation, or genetic load, should be explored in future research.
EVIDENCE FOR LONG‐DISTANCE POLLEN DISPERSAL IN MILKWEEDS (ASCLEPIAS EXALTATA)
TLDR
Pollen‐mediated gene flow and infrequent interspecific matings provide mechanisms to lower genetic differentiation among populations to maintain novel, low‐frequency alleles within populations of A. exaltata.
Molecular Markers Reveal Cryptic Species Within Polytrichum commune (Common Hair‐Cap Moss)
TLDR
Allozyme electrophoresis is used to show that there are two distinct allozyme multi-locus genotypes within the moss genus Polytrichum, and it is argued that P. commune and P. uliginosum are two genetically distinct entities with fixed morphological differences and a considerable niche differentiation.
POPULATION STRUCTURE OF A CLONAL GORGONIAN CORAL: THE INTERPLAY BETWEEN CLONAL REPRODUCTION AND DISTURBANCE
  • M. Coffroth, H. Lasker
  • Environmental Science
    Evolution; international journal of organic evolution
  • 1998
TLDR
A generalized model relating population structure of clonal species to disturbance and the mode of vegetative propagation is presented, which shows that among these taxa disturbance has a greater affect on individual survival than on propagation.
...
...