Delimitation of taxa of Sphagnum subsecundum s.l. (Musci, Sphagnaceae) based on multienzyme phenotype and cytological characters

Melosik, Iwona; Odrzykoski, Ireneusz I.; Śliwińska, Elwira

doi:10.1127/0029-5035/2005/0080-0397

Cited by 19 publications

(9 citation statements)

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“…Both auto and allopolyploid origins have been hypothesized for the diploid taxa in the S. subsecundum complex (e.g., Maass and Harvey, 1973; Eddy, 1977). Some evidence of heterozygosity at isozyme loci has previously been described (Melosik et al, 2005), and our results corroborate an interpretation that diploid plants of S. carolinianum, S. inundatum , and S. lescurii have fixed or nearly fixed heterozygosity, a pattern consistent with allopolyploid origins. Nevertheless, significant questions remain regarding the evolutionary origin(s) of these diploid plants.…”

Section: Discussionsupporting

confidence: 91%

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Cytotype variation and allopolyploidy in North American species of the Sphagnum subsecundum complex (Sphagnaceae)

Ricca

Beecher

Boles

et al. 2008

American J of Botany

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Allopolyploid speciation is likely the predominant mode of sympatric speciation in plants. The Sphagnum subsecundum complex includes six species in North America. Three have haploid gametophytes, and three are thought to have diploid gametophytes. Microsatellite analyses indicated that some plants of S. inundatum and S. lescurii are heterozygous at most loci, but others have only one allele at each locus. Flow cytometry and Feulgen staining showed that heterozygous plants have twice the genome size as plants with one allele per locus; thus, microsatellite patterns can be used to survey the distribution and abundance of haploid and diploid gametophytes. Microsatellite analyses also revealed that S. carolinianum is consistently diploid, but S. lescurii and S. inundatum include both haploid and diploid populations. The frequency of diploid plants in S. lescurii increases with latitude. In an analysis of one population of S. lescurii, both cytotypes co-occurred but were genetically differentiated with no evidence of interbreeding. The degree of genetic differentiation showed that the diploids were not derived from simple genome duplication of the local haploids. Heterozygosity appears to be fixed or nearly so in diploids, strongly suggesting that although morphologically indistinguishable from the haploids, they are derived by allopolyploidy.

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Section: Discussionsupporting

confidence: 91%

“…have haploid gametophytes, whereas S. inundatum Russow and S. lescurii Sull. are said to have diploid gametophytes (Fritsch, 1982; Newton, 1993; Sliwinska et al, 2000; Melosik et al, 2005). Sphagnum lescurii is widespread in eastern North America but is endemic there, whereas S. inundatum is reported from both North America and Europe.…”

mentioning

confidence: 99%

Cytotype variation and allopolyploidy in North American species of the Sphagnum subsecundum complex (Sphagnaceae)

Ricca

Beecher

Boles

et al. 2008

American J of Botany

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“…Once again, the importance of cytological analysis to correctly interpret the data is emphasized (see Section 7.6.1.3) and the possibility of cytosolic inhibitors leading to the differences observed cannot be ruled out. Recent studies, again extolling the speed and reliability of FCM, also failed to carry out cytological checks on the material examined (Melosik et al 2005).…”

Section: Bryophytesmentioning

confidence: 99%

Genome Size and its Uses: The Impact of Flow Cytometry

Leitch

Bennett

2007

Flow Cytometry With Plant Cells

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“…Andrus. It was thought that the first three species have consistently haploid gametophytes and the last three species have diploid gametophytes (Fritsch, 1982;Newton, 1993;Sliwinska, Krzakowa & Melosik, 2000;Melosik, Odrzykoski & Sliwinska, 2005). Ricca et al (2008) showed, however, that both S. lescurii and S. inundatum include haploid and diploid plants.…”

Section: Introductionmentioning

confidence: 99%

Allopolyploidy and homoploid hybridization in the Sphagnum subsecundum complex (Sphagnaceae: Bryophyta)

Ricca¹,

Shaw²

2009

Biological Journal of the Linnean Society

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Several complexes of species in Sphagnum (peat mosses) originated through hybridization and allopolyploidy, suggesting that these processes have played a major evolutionary role in this genus. The Sphagnum subsecundum complex includes gametophytically haploid and diploid species in North America. Analyses of 12 microsatellite loci and sequences from two plastid DNA markers show that the evolutionary history of this group is substantially more complex than previously thought. Two taxonomic species, Sphagnum lescurii and Sphagnum inundatum, include both haploid and diploid populations. Within each ploidal level, S. lescurii and S. inundatum are not genetically differentiated. The diploid taxa show patterns of fixed heterozygosity for the microsatellite markers, consistent with an allopolyploid origin. Diploid S. lescurii is an allopolyploid between haploid S. lescurii and (haploid) S. subsecundum. Sphagnum carolinianum is an allopolyploid between haploid S. lescurii and an unknown parent. We detected homoploid hybridization between the haploids Sphagnum contortum and S. subsecundum. Finally, we report three samples of diploid Sphagnum platyphyllum (otherwise haploid) that have an allopolyploid origin involving north-eastern haploid S. platyphyllum and an unidentified taxon.

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Delimitation of taxa of Sphagnum subsecundum s.l. (Musci, Sphagnaceae) based on multienzyme phenotype and cytological characters

Cited by 19 publications

References 0 publications

Cytotype variation and allopolyploidy in North American species of the Sphagnum subsecundum complex (Sphagnaceae)

Cytotype variation and allopolyploidy in North American species of the Sphagnum subsecundum complex (Sphagnaceae)

Genome Size and its Uses: The Impact of Flow Cytometry

Allopolyploidy and homoploid hybridization in the Sphagnum subsecundum complex (Sphagnaceae: Bryophyta)

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