The use of isozyme data for inferring ancestry of polyploid pteridophytes

Werth, Charles R.

doi:10.1016/0305-1978(89)90069-0

Cited by 65 publications

(44 citation statements)

References 58 publications

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“…mururiu (Lovis, 1 9 7 ; Vida, 1970). We would therefore expect a selection for pairing factors (Ph alleles; Werth, 1989). The result of such evolutionary constraints would be an accumukation of mainly well adapted lines with regular meiosis and capability of inbseding.…”

Section: The Situation In the Investigakd Populationsmentioning

confidence: 99%

Outbreeding depression in the fernAsplenium ruta-murariaL.: Evidence from enzyme electrophoresis, meiotic irregularities and reduced spore viability

Schneller

1996

Biological Journal of the Linnean Society

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Asphiurn rub-rnuraria is a mainly inbEding, highly specialized, rock or wall inhabiting, autotetraploid fern. Enzyme electrzhoresis combined with cytological investigations and s p s e measurements r e v e g that outbr7eding deprssion occurs in natural po75ations when two different genotypes cross. Crossing results insregularities in m e i s and reduced s p z e fertility. Two h y p s e s e s are formulated to explain this phenomenon. The first hypo5esis suggests a multiple origin of autopolyploids and assumes that long distance dispersal by spores mixes very distant and locally a d s t e d genoGes. Thus, the consequence is the observed o u t b a d % depression. The second hypotJhesis assumes that i n b s d i n g has a very high adaptive value in this ecologicay specialized, autoprnloid species. This fact and strong selection for r e s r meiosis have led to fuiy fertile inbred lines, which are capable of founding populdtons by single spores. Crzsing of two genetically different lines may disturb the control of pairing in meiosis and thus c a g e outbreeding depression. k

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Section: The Situation In the Investigakd Populationsmentioning

confidence: 99%

Outbreeding depression in the fernAsplenium ruta-murariaL.: Evidence from enzyme electrophoresis, meiotic irregularities and reduced spore viability

Schneller

1996

Biological Journal of the Linnean Society

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“…Furthermore, the distinction between allozymes/isozymes and alleles/loci is difficult without crossing experiments and analyses of progeny segregation (Werth, 1989;Brochmann, Soltis & Soltis, 1992). The term 'enzyme band is therefore used in the polyploid materials instead of allozymes/isozymes.…”

Section: Chromosome Countsmentioning

confidence: 99%

Variation in the Festuca brachyphylla (Poaceae) complex in Svalbard, elucidated by chromosome numbers and isozymes

Guldahl¹,

Borgen²,

Nordal³

2001

Botanical Journal of the Linnean Society

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Contrasting with former taxonomic treatments, chromosome numbers and isozyme data support the delimitation of the seminiferous representatives of the Festuca brachyphylla complex in Svalbard into four species: R baffinensis, E brachyphylla, E hyperborea and E edlundiae. Unique enzyme markers were found for all species. Festuca brachyphylla proved hexaploid, and the others, tetraploid. The chromosome numbers of R hyperborea and E brachyphylla (as circumscribed at present) are new to Svalbard. Festuca buffinensis is the most distinct species within the complex, probably representing a separate evolutionary lineage. The three other species seem closely related, showing mutually equidistant relationships. Some deviating plants found on disturbed ground might represent hybrid derivatives or an introduced foreign strain of the elsewhere variable E brachyphylla. Materials of diploid R ovina from northern Fennoscandia was enzymatically closely related to the E brachyphylla complex in Svalbard. Festuca brachyphylla, R edlundiae, and E hyperborea all had a stronger affinity to R ovina than to R baffinensis, indicating that the R brachyphylla complex is an artificial taxonomic group. There are reasons t o believe that the origin of the polyploid taxa of the R brachyphylla complex can be traced to diploid species of the E brachyphylla and R ovina complexes.

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“…WERTH (1989) explained in detail how this method can be used to reconstruct the ancestry of taxa of hybrid origin. This method is a powerful tool, especially when species-specific alleles can be found.…”

Section: Introductionmentioning

confidence: 99%

On the status of Diphasiastrum oellgaardii (Lycopodiaceae, Pteridophyta)

Vogel

Rumsey

1999

Feddes Repertorium

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With 3 FiguresS u m m a r y In a recent publication HORN (1997: 9) enthusiastically states that with the study by STOOR et al. ( 1996). which he co-authored, "the biosystematics of Diphasiastrurn in Europe has finally been resolved'. These authors present a scheme showing six taxa, three basal taxa (Ausgangsarten) and three taxa of hybrid origin in a triangular form to illustrate the relationships of European Diphnsinsrrum and they include a new taxon of hybrid origin, D. oellgunrdii. The evidence for the origin and identity of D. oellgaardii is based solely on molecular data derived from allozyme electrophoresis. The interpretation of the allozyme data presented by the authors is open to dispute. The analysis of their data appears to be incorrect as STOOR et al. (1996) misapply the concept of additive banding patterns and fixed heterozygosity to homoploid hybrid taxa. Furthermore, the photograph in STOOR et al. (1996) of D. oellgaardii at its type locality resembles a growth form o f D. ulpinurn frequent in the British Isles. In the light of these concerns we recommend caution and suggest that this name should not be adopted for individuals apparently intermediate between D. alpinurn and D. trisrachyn until further research is presented.

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The use of isozyme data for inferring ancestry of polyploid pteridophytes

Cited by 65 publications

References 58 publications

Outbreeding depression in the fernAsplenium ruta-murariaL.: Evidence from enzyme electrophoresis, meiotic irregularities and reduced spore viability

Outbreeding depression in the fernAsplenium ruta-murariaL.: Evidence from enzyme electrophoresis, meiotic irregularities and reduced spore viability

Variation in the Festuca brachyphylla (Poaceae) complex in Svalbard, elucidated by chromosome numbers and isozymes

On the status of Diphasiastrum oellgaardii (Lycopodiaceae, Pteridophyta)

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