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Electrophoretic evidence for disomic inheritance and allopolyploid origin of the octoploid Cerastium alpinum (Caryophyllaceae).
Umeå University, Faculty of Science and Technology, Molecular Biology (Faculty of Science and Technology). (Saura)
2006 (English)In: J Hered, ISSN 0022-1503, Vol. 97, no 3, 296-302 p.Article in journal (Refereed) Published
Abstract [en]

The mode of inheritance of six enzyme markers in the octoploid alpine plant Cerastium alpinum was analyzed. Offspring from crosses between heterozygotes showed fixed heterozygosity at malate dehydrogenase-2, phosphoglucoisomerase-2, triosephosphate isomerase-2, and triosephosphate isomerase-3. Phosphoglucomutase-1 also showed fixed heterozygosity except in offspring from one cross. Fixed heterozygosity in five enzyme systems suggests that C. alpinum has originated through at least some allopolyploidization. Offspring from plants heterozygous for two alleles at the menadione reductase-1 (Mr-1) locus did not deviate significantly from a 1:2:1 ratio. The large proportion of homozygotes suggests disomic inheritance because any kind of polysomic inheritance would result in a substantially increased proportion of heterozygotes relative to disomic inheritance. Assuming a diploid model for Mr-1, this locus was used to analyze the population genetic structure within C. alpinum populations. Inbreeding was found in many alpine populations. This may help explain the large genetic distances found among alpine populations in a previous study. The analysis is only based on one segregating locus, and the results should therefore be treated with caution. However, by establishing the mode of inheritance through crosses, we have been able to use a codominant marker in population genetic analysis of an octoploid plant.

Place, publisher, year, edition, pages
2006. Vol. 97, no 3, 296-302 p.
Keyword [en]
Caryophyllaceae/*genetics, Electrophoresis; Polyacrylamide Gel, Heterozygote, Polyploidy
URN: urn:nbn:se:umu:diva-18028PubMedID: 16614135OAI: diva2:157701
Available from: 2007-11-26 Created: 2007-11-26 Last updated: 2011-01-11Bibliographically approved

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Saura, Anssi
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