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Level and distribution of genetic diversity in the European species Nardus stricta L. (Poaceae) inferred from chloroplast DNA and nuclear amplified fragment length polymorphism markers

Zoric, Nina
Master thesis
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zoric_master2013.pdf (1.335Mb)
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http://hdl.handle.net/11250/189603
Utgivelsesdato
2013-10-21
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  • Master's theses (IPM) [204]
Sammendrag
The present level and distribution of genetic variation is defined by the

interplay between gene flow, drift, inbreeding, mutations and selection and reflects

both contemporary and historical processes (e.g. Pleistocene glaciations). Especially,

the breeding strategy of a species is a dominant factor influencing the pattern of

genetic diversity. In this study, using AFLP molecular markers and cpDNA

sequences, I investigate neutral genetic variation of nuclear and chloroplast

genomes of European populations of the grass Nardus stricta.

The results of the present study indicate a lack of genetic variation in

European N. stricta populations; there were no cpDNA variation detected and only

the Austrian population had different AFLP pattern from other populations

analyzed. In earlier studies, it has been suggested that N. stricta reproduces via

agamospermy, and the observed lack of genetic variation strengthens this

hypothesis about asexual reproduction in N. stricta. Also, given the lack of variation

in both nuclear and chloroplast DNA it is likely that the present European

populations of N. stricta come from one refugium only, but it is impossible to say

which based on our data. However, nucleotide variability is not the only source of

variation that results in phenotypic variation. Epigenetic variation might enable the

wide geographical distribution of N. stricta and explain the observed lack of

nucleotide variation. This might be interesting to investigate further.

Even though AFLP is a high resolution technique, the resolving power of the

techniques used should be carefully investigated. I strongly emphasize that these

results are preliminary as they are only based on screening of a few populations.

More populations need to be screened and possibly also more primer/restriction

enzymes combinations before any conclusions can be drawn.
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Norwegian University of Life Sciences, Ås

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