High Levels of Genetic Variability in the Haploid Moss Plagiomnium ciliare

Wyatt, Robert; Odrzykoski, Ireneusz J.; Stoneburner, Ann

doi:10.2307/2409588

Cited by 53 publications

(47 citation statements)

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“…Polytrichum juniperinum can be added to a growing number of studies which show that species with a predominant haploid stage are no less genetically variable than many diploid organisms (Spieth, 1975;Krzakowa and Szweykowski, 1979;Selander and Levin, 1980;Cummins and Wyatt, 1981;Daniels, 1982;Yamazaki, 1981;Vries et a!., 1983;Zielinski, 1984;Wyatt, 1985;Hofman, 1988;Wyatt, Odrzykoski and Stoneburner, 1989;Wyatt, Stoneburner and Odrzykoski, 1989). Low levels of genetic variation have been observed in many Hymenoptera species with the interpretation that the presence of haploid males in some way reduces genetic variation (Metcalf eta!., 1975;Berkelhamer, 1983;Graur, 1985).…”

Section: Discussionmentioning

confidence: 99%

“…Although not large, this sample size has been found to be adequate for estimating allele frequency variation in populations of other moss species (Wyatt et a!., 1988;Wyatt, Odrzykoski and Stoneburner, 1989). Genotypic variation in the population was quantified by the total number of different six-locus genotypes observed as well as a measure of genotypic diversity.…”

Section: Genotypic Diversitymentioning

confidence: 99%

“…Recent studies on selected moss and liverwort species (Krzakowa and Szweykowski, 1979;Cummins and Wyatt, 1981;Yamazaki, 1981;Daniels, 1982;Vries et a!., 1983;Zielinski, 1984;Wyatt, 1985;Shaw, Meagher and Harley, 1987;Hofman, 1988;Wyatt, Odrzykoski and Stoneburner, 1989;Wyatt, Stoneburner and Odrzykoski, 1989) suggest that the presence of a dominant haploid stage has not resulted in reduced genetic variation compared to diploid organisms, at least as measured by allozyme variation. These studies document the presence of genetic variation both within and between populations of haploid gametophytes.…”

Section: Introductionmentioning

confidence: 99%

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Microgeographic genetic variation in the haploid and diploid stages of the moss Polytrichum juniperinum Hedw.

Innes

1990

Heredity

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Electrophoretic variability at six enzyme loci was used to examine genotypic variation in the haploid (gametophyte) and diploid (sporophyte) stages of the moss Polytrichum juniperinum Hedw. from a population in eastern Newfoundland. Samples from 16 sites revealed 13 six-locus haploid genotypes and a total of 18 gametophyte genotypes (ten male and eight female) when the genotypic data were combined with sex. Gametophyte genotypic diversity was low within each site and there was marked microgeographic differentiation between sites within the population. There was, however, no relationship between genetic and microgeographic distances among the sites. The observed number of six-locus genotypes and their relative frequency within the population did not differ significantly from the values expected for a sexually reproducing population. This genotypic structure is consistent with sexual reproduction generating the observed variation but vegatative reproduction and limited dispersal maintaining microgeographic genetic heterogeneity within the population. Diploid, six-locus genotypes were determined for 137 sporophytes. The sporophyte genotypic variation suggested that mating was occurring predominantly between female and male gametophytes within the same site. Fewer gametophyte genotypes were observed than were expected to be produced by sporophyte genotypes observed at each site, suggesting that genetical and/or ecological factors may be limiting the recruitment of new haploid gametophyte genotypes into the population.

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Section: Discussionmentioning

confidence: 99%

Section: Genotypic Diversitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microgeographic genetic variation in the haploid and diploid stages of the moss Polytrichum juniperinum Hedw.

Innes

1990

Heredity

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“…In contrast, other investigated bryophytes generally show a strong amongpopulation component of genetic variation. Wyatt et aL (1989) reported G1 = 0.171 in mountain populations of Plagiomnium ciliare in SE USA, whereas Derda & Wyatt (1990) found GST = 0.392 for Polytrichum commune in F. USA and Shaw & Rooks (1994) found GST = 0.918 for Mielichhoferia elongata from USA and N. Europe. Thus, the genetic structure of H. splendens is more similar to conifers than to hitherto investigated bryophytes.…”

Section: Genetic Variationmentioning

confidence: 99%

Genetic variation in the clonal bryophyte Hylocomium splendens at hierarchical geographical scales in Scandinavia

1997

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The widespread bryophyte Hylocomium splendens was sampled in a hierarchical fashion from populations representing four Scandinavian vegetation zones. Allozyme electrophoresis revealed variation at 11 out of 13 screened loci, allowing accurate identification of genotypes. From a total sample of 298 shoots 79 genotypes could be detected, giving the proportion of distinguishable genotypes (PD) of 0.265. The total allelic diversity (HT) based on polymorphic loci was 0.274. The relative differentiation among populations was low (GST= 0.073), indicating a high level of gene flow. Differences in population structuring occurred between a subarcticalpine site vs. three lowland sites. The subarctic-alpine population had one widespread clone, which appeared to be propagated by dispersal of vegetative fragments. That population also comprised many rare genotypes, often occurring together within 10 x 10 cm patches. The lowland populations had genotypes that were locally common and often dominant within the patches. When identical genotypes were observed in multiple patches within these populations, it was usually statistically highly probable that they had arisen by independent sexual recombinations.

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“…10 cm to fertilize a female moss plant (Reynolds, 1980). However, recent studies showed that dioicous mosses are more genetically diverse than would be expected with such dispersal limitation (Wyatt et al, 1989;Van der Velde et al, 2001;Wilson and Provan, 2003). Indeed several studies have since demonstrated greater sperm dispersal distances (for a review, see Glime, 2007), as well as stresstolerant sperm (Rosenstiel and Eppley, 2009;Shortlidge et al, 2012) and microarthropod-mediated sexual reproduction (Cronberg et al, 2006;Cronberg, 2012;Rosenstiel et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Passive warming reduces stress and shifts reproductive effort in the Antarctic moss,Polytrichastrum alpinum

Shortlidge

Eppley

Köhler

et al. 2016

Ann Bot

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Background and Aims The Western Antarctic Peninsula is one of the most rapidly warming regions on Earth, and many biotic communities inhabiting this dynamic region are responding to these well-documented climatic shifts. Yet some of the most prevalent organisms of terrestrial Antarctica, the mosses, and their responses to warming have been relatively overlooked and understudied. In this research, the impacts of 6 years of passive warming were investigated using open top chambers (OTCs), on moss communities of Fildes Peninsula, King George Island, Antarctica.Methods The effects of experimental passive warming on the morphology, sexual reproductive effort and stress physiology of a common dioicous Antarctic moss, Polytrichastrum alpinum, were tested, gaining the first speciesspecific mechanistic insight into moss responses to warming in the Antarctic. Additionally community analyses were conducted examining the impact of warming on overall moss percentage cover and sporophyte production in intact Antarctic moss communities.Key Results Our results show a generally greater percentage moss cover under warming conditions as well as increased gametangia production in P. alpinum. Distinct morphological and physiological shifts in P. alpinum were found under passive warming compared with those without warming: warmed mosses reduced investment in cellular stress defences, but invested more towards primary productivity and gametangia development.Conclusions Taken together, results from this study of mosses under passive warming imply that in ice-free moss-dominated regions, continued climate warming will probably have profound impacts on moss biology and colonization along the Western Antarctic Peninsula. Such findings highlight the fundamental role that mosses will play in influencing the terrestrialization of a warming Antarctica.

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High Levels of Genetic Variability in the Haploid Moss Plagiomnium ciliare

Cited by 53 publications

References 0 publications

Microgeographic genetic variation in the haploid and diploid stages of the moss Polytrichum juniperinum Hedw.

Microgeographic genetic variation in the haploid and diploid stages of the moss Polytrichum juniperinum Hedw.

Genetic variation in the clonal bryophyte Hylocomium splendens at hierarchical geographical scales in Scandinavia

Passive warming reduces stress and shifts reproductive effort in the Antarctic moss,Polytrichastrum alpinum

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